Browsing by Author "Erwin, Erwin"

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    Analisis Kandungan Mineral Magnetik Pasir Pantai Padang Sumatera Barat Disintesis Dengan Metode Ball Milling Dua Tahap Menggunakan XRF dan SEM
    (2020-08) Ersita, Ribka; Erwin, Erwin
    Synthesis and analysis of magnetic particles content of Padang beach sand West Sumatra Province has been carried out using two step ball milling method. The purpose of this research is to obtain the percentage and size of particle in the synthesized samples. The instruments used were XRF and SEM. The results of this study showed that the Fe content of the synthesized magnetic particles for first step ball milling is 31.6%. The magnetic particles size for the second step ball milling increases to 70.6%. The shape and size of the particles obtained are irregular and the resulting particle sizes range of 2-12 μm.
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    APLIKASI NANOPARTIKEL MAGNETIK DI DOPING DENGAN Mn UNTUK ADSORPSI LOGAM BERAT DALAM AIR SUNGAI SIAK
    (perpustakaan UR, 2021-07) Ekasari, Ericha; Erwin, Erwin
    The magnetic nanoparticles were prepared from River Suci Bengkulu beach sand using two-stage ball milling for 120 hours. The product of the ball milling was divided into 3 parts and then doped using manganese (Mn) with a concentration of (0; 5; and 15)% of the total mass magnetic nanoparticles using ball milling for 20 hours. These nanocomposite (α-Fe2O3/Fe3O4+Mn) were used to adsorb some heavy metals such a lead Pb and Cu in Sungai Siak’s water at Duku Harbor Pekanbaru. The magnetic susceptibility of the samples was measured using Pasco Magnetic Probe PS-2162. The crystallite size and magnetic phase of the product were determined using X-Ray Diffraction (XRD) method. The amount of heavy metal adsorption was determined using Atomic Absorption Spectroscopy (AAS). The XRD characterization results showed that the crystalline size increases with increasing manganese (Mn) concentration. Moreover, the sample consisted two magnetic phase that is Fe3O4 (Magnetite) and α- Fe2O3 (Hematite). The AAS characterization results showed that the amount of heavy metals decreases with the increase in the concentration of manganese (Mn).
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    Evaluasi Kebisingan Lalu Lintas Di Kota Pekanbaru
    (wahyu sari yeni, 2018-07-13) Hasan, Indra; Erwin, Erwin; Zulkarnaini, Zulkarnaini; Isranuri, Isranuri
    Noise is unwanted sound that might be disturbing public life especially in urban area. Pekanbaru is one of big city in Indonesia. The rapid increase of economic growth will impact to the number of vehicles that cross over the roads. The purpose of this research is to study the phenomenon of traffic noise sourced by vehicle. The measurements were performed to the eight of main roads in Pekanbaru city. And the result showed the traffic noise which exceeded the threshold of public health. Preventive action should be conducted to mitigate the noise pollution.
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    KARAKTERISASI SIFAT MAGNETIK TANAH SEPANJANG JALAN UTAMA DALAM KAMPUS UNIVERSITAS RIAU MENGGUNAKAN PROBE MAGNETIC PASCO PS-2162
    (wahyu sari yeni, 2018-10-29) Assary, Ayu; Erwin, Erwin
    Magnetically soil contamination can be caused by motor vehicle emussions of exhaust, where friction between the tire and the road surface cause magnetic particles. This study was aimed to characterize of the magnetic properties of the soil along the main roads of the University of Riau campus which are suspected to have been contaminated with magnetic particles. Magnetic properties measured, are magnetic induction, magnetic susceptibility and mass susceptibility. The method used in this research is an experimental method. Sampling was performed at 10 different points with mass ranging from (1-5.5) kg. The separation of magnetic particles from the samples was performed by using an Iron Sand Separator. The result show that most samples containing magnetic particles come from Point 2 (Jln. Muchtar Lutfi) with magnetism rate of 0.536%, While the least samples containing magnetic particles are from Point 10 (Jln. Binawidya UNRI) with magnetism 0.019%. Determination of magnetic susceptibility was done after knowing magnetic induction as a function of current of (2, 4, 6, 8 and 10) A and distance function of (1, 2, 3, 4 and 5) mm from each sample which were measured using Probe Magnetic Pasco PS-2162. The highest sample magnetic susceptibility value was obtained from Point 1 (Jln. Muchtar Lutfi), ie 2467.5×10−5, where as the highest sample mass susceptibility value was resulted from Point 4 (FAPERTA), ie 2456.2×10−8 𝑚3𝑘𝑔. These magnetic and mass susceptibility value obtained are at the Ilmenite mineral interval, where at this interval the samples contain magnetic particles of FeTiO3.
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    Modifikasi Nanopartikel Oksida Besi dari Pasir Pantai Sungai Suci Bengkulu Melalui Doping Mangan Menggunakan Ball Milling
    (Elfitra, 2022-01) Sianturi, Jekson; Erwin, Erwin
    Magnetic and morphological properties of magnetic nanoparticles of natural sand from Sungai Suci Beach in Pondok Kelapa District, Bengkulu Province have been determined. The natural sand that has been extracted was processed using an Iron Sand Separator (ISS) then the product was milled using ball milling which separated between magnetic and non-magnetic minerals using magnet Neodymium Iron Boron (NdFeB). The NdFeB product was milled using ball milling for 120 hours with a milling ball diameter of 1.5 cm the result is called BM I product. BM I products were doped using Manganese with concentrations of 0wt.%, 5wt.%, 10wt.%, 15wt.% and, 20wt.%. The doping process was carried out using ball milling for 20 hours with a milling ball diameter of 1.5 cm, the result is called BM II Product. The solenoid magnetic induction (B0) and the total solenoid magnetic induction (BT) were measured using the Pasco Magnetic Probe PS-216. The magnetic susceptibility of the sample was calculated based on the values of B0 and BT. The magnetic properties of BM II products were determined using a Vibrating Sample Magnetometer (VSM) based on the hysteresis loop. The results showed that the magnetization value decreased with the increase of manganese concentration, the coercivity (Hc) and loop squareness values increased with the increase of manganese, the remanent magnetization value varied with the maximum value at 10wt.% manganese concentration. Scanning Electron Microscope (SEM) was used to determine the morphology of the samples. Along with the addition of manganese concentration, clumping or agglomeration occurred in the BM II Mn10 wt.% and BM II Mn 20 wt.% samples and the particle sizes became smaller and finer.
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    PEMETAAN SUSEPTIBILITAS MAGNETIK PASIR DAN DEBU DI KM 6 JALAN GARUDA SAKTI PEKANBARU MENGGUNAKAN SOFTWARE SURFER
    (wahyu sari yeni, 2018-10-29) Afni, Fauzi; Erwin, Erwin
    The mapping of magnetic susceptibility of sand and dust along Garuda Sakti road Pekanbaru especially at kilometer 6th using “Surfer” software has been conducted. Samples are sand and dust which were was collected using grid method for 40 point locations at the kilometer 6th of the road. Before the separating of magnetic particle and non magnetic particle using Neodibium Iron Boron magnet (NeFeB), the samples first were made freed of rubbish. The value of magnetic degree is obtained by comparison between the concentrate mass and the sample mass. Total magnetic induction was measured using magnetic probe Pasco PS-2162 through a solenoid of 2000 turns with the length of 10 cm and diameter of 3 cm. The magnetic induction of solenoid was measured as a function of solenoid current that is 2-10 A in which the distance of probe was kept constant that is 1 mm from the one of the end of solenoid, the magnetic induction was also measured as a function of distance from one of the end of solenoid as current was kept constant that is 2 A . The results showed that it was found that the magnetic degree of the samples is in the range of 0,73% to 2,14%. When electric current was increased, the magnetic induction is also increased and the magnetic induction decreases as the distance between the sensor and the solenoid is larger. The value of magnetic susceptibility of 40 samples are varied from 194,79 × 10-8 m3/kg to 3036,34 × 10-8 m3/kg. From these values, it can be estimated that magnetic particle of sand and dust at kilometer 6th road of Garuda Sakti are ilmenite (FeTiO3). The mapping of these value was done using “Surfer” software. The magnetic susceptibility mapping shows that values of susceptibility decreased as the distance away from the road.
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    PEMETAAN SUSEPTIBILITAS MAGNETIK PASIR DAN DEBU DI KM 6 JALAN GARUDA SAKTI PEKANBARU MENGGUNAKAN SOFTWARE SURFER
    (2018-03-07) Afni, Fauzi; Erwin, Erwin
    The mapping of magnetic susceptibility of sand and dust along Garuda Sakti road Pekanbaru especially at kilometer 6th using “Surfer” software has been conducted. Samples are sand and dust which were was collected using grid method for 40 point locations at the kilometer 6th of the road. Before the separating of magnetic particle and non magnetic particle using Neodibium Iron Boron magnet (NeFeB), the samples first were made freed of rubbish. The value of magnetic degree is obtained by comparison between the concentrate mass and the sample mass. Total magnetic induction was measured using magnetic probe Pasco PS-2162 through a solenoid of 2000 turns with the length of 10 cm and diameter of 3 cm. The magnetic induction of solenoid was measured as a function of solenoid current that is 2-10 A in which the distance of probe was kept constant that is 1 mm from the one of the end of solenoid, the magnetic induction was also measured as a function of distance from one of the end of solenoid as current was kept constant that is 2 A . The results showed that it was found that the magnetic degree of the samples is in the range of 0,73% to 2,14%. When electric current was increased, the magnetic induction is also increased and the magnetic induction decreases as the distance between the sensor and the solenoid is larger. The value of magnetic susceptibility of 40 samples are varied from 194,79 × 10-8 m3/kg to 3036,34 × 10-8 m3/kg. From these values, it can be estimated that magnetic particle of sand and dust at kilometer 6th road of Garuda Sakti are ilmenite (FeTiO3). The mapping of these value was done using “Surfer” software. The magnetic susceptibility mapping shows that values of susceptibility decreased as the distance away from the road.
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    PENENTUAN NILAI SUSEPTIBILITAS MAGNETIK DAN MORFOLOGI NANOPARTIKEL Fe3O4 DIDOPING DENGAN TEMBAGA
    (Elfitra, 2022-01) Handayani, Dwi Lutfi; Erwin, Erwin
    Research on the effect of the addition of copper concentration on the magnetic susceptibility and morphological value of natural sand iron oxide nanoparticles taken from Ulakan Pariaman Beach, West Sumatra Province has been carried out. The iron and non iron oxide particles of sand sample was separated using an Iron Sand Separator (ISS) then the product was separated again between iron and other iron oxides using Neodymium Iron Boron (NdFeB) magnets, the result is called a NdFeB product. The NdFeB product was milled through step one for 3 hours with mill balls diameter of 1.5 cm as many as 18 balls, the result is called product BM 1. The product BM 1 was separated from iron and other oxides using NdFeB magnets. The second stage ball milling was done for 15 hours with the same milling balls, the result is called BM 2 product. BM 2 product was separated again from iron and other oxides using NdFeB magnets, then milled again for 102 hours with a combined diameter of 1.5 cm milling balls as many as 18 balls and 0.5 cm as many as 50 balls, the result is called BM 3 product. BM 3 product was divided into 5 parts, then each part was doped with Cu (copper) as a function of weight concentration using ball milling for 20 hours with the same milling ball diameter parameter, the result are called composite nanoparticles (Fe3O4)100-xCux where x= 0 %; 5 %; 10 %; 15 %; and 20 %. Magnetic susceptibility was calculated based on the value of the magnetic induction of the solenoid (B0) and the total magnetic induction of the solenoid (BT) using the Pasco PS-2162 magnetic probe as a function of current 200; 400; 600; 800; and 1000 mA. The results showed that the magnetic susceptibility decreased from 2524.04 x 10-5; 1931.66 x 10-5; 1897.32 x 10-5; 1828.64 x 10-5; and 1794.30 x 10-5 with the addition of a copper weight concentration of 0 %; 5 %; 10 %; 15 %; and 20 %. The size and shape of the iron oxide nanoparticles were determined by Scanning Electron Microscope (SEM). The results of SEM analysis show that the particle size increases with the addition of copper concentration (wt.%).
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    PENGARUH DOPING COBALT TERHADAP SIFAT STRUKTUR NANOPARTIKEL OKSIDA BESI DAN APLIKASI DEGRADASI METILEN BIRU
    (Elfitra, 2023-04) Farizi, Salman Al; Erwin, Erwin
    cIron oxide nanoparticles wese doped with Cobalt through the Ball Milling method at various percentages of 0 wt.%, 5 wt.% and 10 wt.%. Crystal size structure and product identification were determined using X-ray Diffractometer (XRD) and X-ray Fluorescence (XRF). The results showed that the product contained the hematite phase (α-Fe2O3) with a Rhombohedral crystal structure. The crystal size decreases with increasing Cobalt concentration. Before doping, the Fe element had a concentration of 52.139% while after Cobalt 5 wt.% doping the concentration of Fe became 45.468%. Other elements such as Ti, Mn, Si, P, Ca, Cr, Zn, Ag, and Pb also decreased. The ability of nanoparticles as a catalyst in UV-Vis spectroscopy and showed a poor ability to degrade methylene blue in aqueous solution. The best efficiency when hematite was doped with Cobalt 0 wt.%, 5 wt.% and 10 wt.% in the first 20 minutes were 81.62%, 70.909% and 82.856%, respectively.
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    PENGARUH DOPING MANGAN TERHADAP KEMAMPUAN KATALIS NANOPARTIKEL HEMATIT MENDEGRADASI METILEN BIRU
    (2021-03) Fitri, Ainun Syarifatul; Erwin, Erwin
    Textile industrial waste is one of the factors causing water pollution. Textile industrial waste contains organic material in the form of synthetic dyes. One way to overcome pollution by textile industrial waste is using a degradation method with the help of a catalyst. This study aims to determine the ability of hematite (α-Fe2O3) magnetic nanoperticle doped with manganese (Mn) to degrade methylene blue. Hematite (α- Fe2O3) magnetic nanoparticle were obtained from natural sand in Logas Village, Kuantan Singingi Regency. Natural sand was synthesized by ball milling method for 120 hours then doped with Mn as much as 0%, 10%, and 20% of the total mass and milled by ball milling for 20 hours. Testing the ability of Mn-doped hematite magnetic nanoparticles as a catalyst in degrading methylene blue using the Uv-Vis spectrophotometric method and showed excellent ability to degrade methylene blue. The percentage degradation of methylene blue using hydrogen peroxide (H2O2) added with 0%, 10% and 20% Mn doped hematite catalyst after 14 hours of reaction was 87.305%, 99.627% and 98.880%.
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    PENGARUH DOPING NIKEL TERHADAP NILAI SUSEPTIBILITAS MAGNETIK DAN MORFOLOGI NANOPARTIKEL OKSIDA BESI DARI PASIR ALAM DESA LOGAS
    (Elfitra, 2022-03) Ardani, Loly Aisyah; Erwin, Erwin
    Effect of nickel doped iron oxide nanoparticles on their magnetic susceptibility and morphological properties has been investigated. The iron oxide nanoparticles were prepared from Logas natural sand using ball milling method for 3 stages. The sand sample was processed with Iron Sand Separator (ISS) and NdFeB Magnet in order to separate between iron non iron oxide particles prior to ball milling. The first stage milling was done well for 3 hours using 18 balls with diameter of 1.5 cm. The product is called BM 1. The BM 1 product was processed using NdFeB magnets in order to separate between iron non iron oxide particles, then for the second stage of ball milling using the same milling parameters for 15 hours, then the product is called the BM2. The BM2 was processed again using NdFeB magnet and the ball milling process starts again for 102 hours with variations of 18 balls with 1.5 cm diameters and 50 balls with 0.5 cm diameters. The product is then called the BM 3. The BM 3 product was divided into 5 parts in equal weight and doped using Nickel (Ni) nanoperticles with a concentration of (0; 5; 10; 15 and 20) wt% for 20 hours using ball milling. Magnetic susceptibility was measured using Pasco PS-2162 Magnetic Probe as a function of currents of 100 mA, 200 mA, 400 mA, 600 mA, and 800 mA. The results of the magnetic susceptibility increased with the addition of nickel concentration. The size and morphology of the iron oxide nanoparticles were characterized by Scanning Electron Microscope (SEM) for 3 selected concentrations of (0;5 and 10) wt%. The results show that the particle size becomes smaller, that is 0.061μ m, 0.047 μm and 0.042 μm as the nickel concentration increases.
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    PENGARUH DOPING NIKEL TERHADAP NILAI SUSEPTIBILITAS MAGNETIK DAN MORFOLOGI PADA NANOPARTIKEL MAGNETITE (Fe3O4) DIPREPARASI MENGGUNAKAN METODE BALL MILLING
    (Elfitra, 2022-03) Sidabutar, Roulina; Erwin, Erwin
    Magnetic susceptibility and morphological properties of iron oxide nanoparticles from the natural sand of the Ampalu beach-Pariaman-West Sumatra prepared using ball milling method have been studied. The sand samples were processed using an Iron Sand Separator (ISS) and NdFeB magnet in order to separate between iron and non iron oxides particles prior to ball milling process. The result is called an NdFeB product, then the NdFeB product was milled using ball milling for 3 stages. The first, second and third stage milling were done for 3, 15 and 102 hours. Each of ball milling product was processed using NdFeB magnet in order to separate between iron and non iron oxides particles. The latter product is called the BM 3. The BM 3 product was divided into 5 parts in equal weight and then doped using Nickel (Ni) nanoperticles with a concentration of (0; 5; 10; 15 and 20) wt% for 20 hours using ball milling and the products are called BM4A, BM4B, BM4C, respectively. Three selected samples namely BM4A, BM4B and BM4C were characterized using a Scanning Electron Microscope (SEM). Magnetic Susceptibility was calculated based on the values of magnetic induction (BO) and total magnetic induction (BT) of the solenoid. The results showed that susceptibility increases with increasing concentration of Nickel doping and thesevalue is in the range of iron oxide nanoparticles. The results of SEM analysis showed that the particle size varied from 740 nm, 880 nm and 1220 nm with an increase in Nickel concentration of 0 wt.%, 5 wt.% and 10 wt.%, respectively.
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    PENGARUH DOPING NIKEL TERHADAP SUSEPTIBILITAS MAGNETIK DARI NANOPARTIKEL HEMATIT DIPREPARASI MENGGUNAKAN METODE BALL MILLING
    (Elfitra, 2022-02) Lestari, Fitri Ayunda; Erwin, Erwin
    Indonesia has abundant natural sand and there are natural magnetic minerals, one of which is iron sand. Where one of the purposes of this iron sand is to purify water that is contaminated by dyes. To increase its ability to degrade the dye, it is doped with nickel using the ball milling method. The effect of nickel doping on the value of magnetic susceptibility and elemental composition of iron oxide nanoparticles of natural Logas sand has been studied. Iron oxide particles were separated from nonferrous particles in the sand samples using Iron Sand Separator (ISS) and Neodymium Iron Boron (NdFeB) magnets. The NdFeB product was milled using the ball milling method for 3 stages. Each stage of the product is processed with NdFeB magnets to separate ferrous and non-ferrous oxide particles. The final product of ball milling is divided into 5 parts, then each part is doped with Ni (Nickel) as a function of weight concentration using ball milling for 20 hours where the composition (Fe2O3)100-xNix where x= 0%; 5%; 10%; 15%; and 20%. Magnetic susceptibility was calculated based on the value of the magnetic induction of the solenoid (B0) and the total magnetic induction of the solenoid (BT) using the Pasco PS-2162 magnetic probe as a function of the electric current of 100 mA; 200mA; 400mA; 600mA; and 800mA. The results showed that the magnetic susceptibility increased with increasing Nickel Nickel concentration. The highest magnetic susceptibility value was found in the sample (Fe2O3)0.8Ni0.2 of 4743.94 x 10-5. The results of element identification using X-Ray Fluorescence (XRF) confirmed the presence of magnetic elements such as Al, Ti, Mn, Fe, and Ni and nonmagnetic elements such as Si, P, Ca, Cr, Zn, Ag, and Pb. The research results have the potential to be applied as element identification or composition test on the sample (Fe2O3)100-xNix.
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    PENGARUH DOPING TEMBAGA TERHADAP NILAI SUSEPTIBILITAS MAGNETIK DAN KOMPOSISI NANOPARTIKEL α-Fe2O3 (HEMATITE) DARI PASIR ALAM LOGAS
    (Elfitra, 2022-02) Gurning, Devi Tamaria; Erwin, Erwin
    The effect of copper doping on the magnetic susceptibility and elemental composition of iron oxide nanoparticles from Logas natural sand, Kuantan Singingi Regency, Riau Province prepared using ball milling has been studied. Prior to ball milling process, this natural sand was processed using Iron Sand Separator (ISS) and Neodynium Iron Boron (NdFeB) magnets in order to separate between iron and non iron oxide particles. This product is called the NdFeB product. The NdFeB product was milled using ball milling for 3 stages. The product of each stage was processed by NdFeB. The last product of ball milling is called BM 3. The BM 3 product was divided into 5 parts with equal weight (wt) and then each of them was doped using copper (Cu) with concentration of 0 wt.%, 5 wt.%, 10 wt.%, 15 wt.% and 20 wt.% using ball milling for 20 hours and the products are called BM4A, BM4B, BM4C, BM4D and BM4E, respectively. The magnetic susceptibility of the BM4 products was measured using Pasco magnetic probe. The resulting magnetic susceptibility of the samples decreases with increasing copper concentration. Elemental composition of the samples was determined using X-Ray Fluorescence (XRF). The results showed that the amount of copper element increased with increasing doping concentration from 0.008% before doping (0 wt% Cu) to 11.684% after doping (5 wt% Cu), while other elements such as Si, Ti, Al, Ca decreases.
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    PENGARUH DOPING TEMBAGA TERHADAP NILAI SUSEPTIBILITAS MAGNETIK DAN KOMPOSISI NANOPARTIKEL α-Fe2O3 (HEMATITE) DARI PASIR ALAM LOGAS
    (Elfitra, 2022-03) Gurning, Devi Tamaria; Erwin, Erwin
    The effect of copper doping on the magnetic susceptibility and elemental composition of iron oxide nanoparticles from Logas natural sand, Kuantan Singingi Regency, Riau Province prepared using ball milling has been studied. Prior to ball milling process, this natural sand was processed using Iron Sand Separator (ISS) and Neodynium Iron Boron (NdFeB) magnets in order to separate between iron and non iron oxide particles. This product is called the NdFeB product. The NdFeB product was milled using ball milling for 3 stages. The product of each stage was processed by NdFeB. The last product of ball milling is called BM 3. The BM 3 product was divided into 5 parts with equal weight (wt) and then each of them was doped using copper (Cu) with concentration of 0 wt.%, 5 wt.%, 10 wt.%, 15 wt.% and 20 wt.% using ball milling for 20 hours and the products are called BM4A, BM4B, BM4C, BM4D and BM4E, respectively. The magnetic susceptibility of the BM4 products was measured using Pasco magnetic probe. The resulting magnetic susceptibility of the samples decreases with increasing copper concentration. Elemental composition of the samples was determined using X-Ray Fluorescence (XRF). The results showed that the amount of copper element increased with increasing doping concentration from 0.008% before doping (0 wt% Cu) to 11.684% after doping (5 wt% Cu), while other elements such as Si, Ti, Al, Ca decreases.
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    PENGARUH DOPING TEMBAGA TERHADAP NILAI SUSEPTIBILITAS MAGNETIK DAN MORFOLOGI NANOPARTIKEL α-Fe2O3 (HEMATITE) DARI PASIR ALAM LOGAS
    (Elfitra, 2022-03) Simanjuntak, Yessi Magdalena; Erwin, Erwin
    The magnetic susceptibility and morphological properties of iron oxide nanoparticles of natural sand from Logas Village, Kuantan Singingi Regency, Riau Province prepared using ball milling method has been studied. First, the ascollected sand was processed using an iron sand separator (ISS) and followed by NdFeB magnet in order to separate between iron and non iron oxide particles. The product of NdFeB was milled using ball milling for 3 stages and the final result was called the BM3 product. The BM3 product was divided into 5 parts with the same amount of weight and each of them was doped using copper with a concentration of 0 wt.%, 5 wt.%, 10 wt.%, 15 wt.% and 20 wt.% then labelled as BM4A, BM4B, BM4C, BM4D and BM4E, respectively. The BM4A, BM4B and BM4C products were selected to be characterized using Scanning Electron Microscope (SEM). Magnetic susceptibility values of the samples were determined based on magnetic induction (B0) and total magnetic induction (Bt) of a solenoid measured using a PASCO type probe. The results of SEM analysis show that the particle size decreases from 78 , 71 dan 67 with increasing copper concentration from 0 wt.%, 5 wt.% dan 10 wt.%, respectively. The results showed that the susceptibility decreases with increasing doping concentration. The maximum and minimum magnetic susceptibility were for sample 0 wt.%, 5 wt.%, 10 wt.%, 15 wt.% and 20 wt.% and respectively 4395,76382 x 10-5, 4323,22646 x 10-5, 4265,19658 x 10-5, 4207,16669 x 10-5 dan 4134,62933 x 10-5.
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    Preparasi Nanopartikel Hematite dari Pasir Alam Desa Logas dan Aplikasinya untuk Penyerapan Logam Berat Dalam Air Sungai Siak
    (Elfitra, 2022-07) Kantiwa, Bagan; Erwin, Erwin
    Water pollution by heavy metals is a serious problem in human life and the lives of other living things in particular. The method that can be used is adsorption with Magnetic Nanoparticles. Magnetic nanoparticles were prepared from natural sand in Logas Village, Kuansing Regency using ball milling for 120 hours. The product from ball milling obtained was divided into 3 parts and then doped using Manganese (Mn) with concentrations of 0 wt% (without doping), 5 wt%, and 10 wt% of the total mass weight of the ball milling product. Nanocomposite (α-Fe2O3 +Mn) was used to absorb heavy metals such as Pb and Cu in Siak River water. Siak river water samples were taken around the water flow under the Siak I Bridge, Pekanbaru. Magnetic susceptibility was measured using the Pasco PS-2126 Magnetic Probe. The crystal size and magnetic phase of the product were determined using the X-Ray Diffraction (XRD) method. The amount of heavy metal adsorption was determined using Atomic Absorption Spectroscopy (AAS). XRD characterization results showed that the crystal size decreased with increasing manganese (Mn) concentration. In addition, the sample consists of Hematite (α-Fe2O3). The results of AAS characterization showed that the amount of heavy metals in water decreased with increasing manganese (Mn) concentration.
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    PREPARASI NANOPARTIKEL MAGNETIK DENGAN METODE BALL MILLING DUA TAHAP DAN APLIKASINYA UNTUK ADSORPSI LOGAM BERAT DALAM AIR SUNGAI SIAK
    (perpustakaan UR, 2021-07) Rydhatunnisa, Winda; Erwin, Erwin
    Environmental pollution by heavy metals becomes a serious problem with the increasing use of heavy metals in the industrial field. One of the widely used methods for removing heavy metals from liquid waste is adsorption using magnetic nanoparticles. Samples of beach sand that have been processed with an Iron Sand Separator (ISS) and separated by NdFeB (Neodymium Iron Boron), crushed by ball milling for 60 hours using a ball size variation of 0,5; 0,7; and 1,5 cm. The product is called ball milling product phase I (PBMT I).PBMT I is separated again by using NdFeB magnets, then in ball milling phase II with a time variation of 20, 40, and 60 hours (PBMT II). The crystal size and magnetic phase of magnetic nanoparticles are determined by the X-Ray Diffraction (XRD) method and heavy metal adsorption is determined using AAS (Atomic Absorption Spectroscopy).. XRD results show that magnetic nanoparticles have 2 magnetic phases namely magnetite (Fe3O4) with cubic crystal structure and hematite (α − Fe2O3) with monoclinic crystal structure. AAS results showed that Cu ion adsorption increased with increasing milling time, whereas the percentage value of adsorption in a row is 27,2%, 40,5%, and 64,7%, while for Pb adsorption ions decreased with increasing milling time of 46,1%, 35,6%, and 11,8%, respectively.
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    Studi Kebisingan Lalu Lintas Dan Korelasi Dengan Sosio-Ekologi Lingkungan Di Kota Pekanbaru
    (wahyu sari yeni, 2019-01-09) Hasan, Indra; Erwin, Erwin; Zulkarnaini, Zulkarnaini; Isranuri, Isranuri
    Traffic noise is a major problem in large cities. Noise itself occurs as an environmental response to natural habitats and the environment exposed to road traffic noise. The purpose of this study is to predict the traffic noise level that has an impact on the environment, ecology and socio-economy. The survey was also conducted in 2016 with 127 random respondents to find out the level of interference and their reaction to the noise of road traffic vehicles. The results indicate that there is a relationship between the ecological impact of noise, the environment and human social life