Browsing by Author "Awaluddin, Amir"

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    AKTIVITAS KATALITIK MANGAN OKSIDA YANG DI-DOPING DENGAN LOGAM TRANSISI MENGGUNAKAN 2 METODE YANG BERBEDA
    (wahyu sari yeni, 2019-07-15) Cindy, Bella Permata; Awaluddin, Amir
    The doped Co-cryptomelane type manganese oxide catalysts were prepared using two type approaches, direct and indirect methods. The products were obtained by the reaction between KMnO4, glucose and small quantity of CoNO3 as dopan using sol-gel method. The as-synthesized Co-cryptomelanes was then characterized by XRD for the phase structure, crystallinity and purity and SEM for morphology. The XRD results indicated that both synthetic method displayed the same cryptomelane phase and the same morphology. The K+ ions in the tunnel of cryptomelane (direct method) are more readily replaced by Co that that synthesized using indirect method. ;The as-synthesized Co-cryptomelane product was then applied for the degradation of methylene blue dye using H2O2 as an oxidant. The maximum degradation of MB was 87,05% using Co-cryptomelane synthesized using direct method for 120 minutes of reaction times.
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    ANALISIS KONSENTRASI HCl DAN WAKTU KONTAL OPTIMAL UNTUKPEMBUATAN ZIOLIT DARI ABU LAYANG DENGAN METODE BATCH
    (2014-05-21) Itnawita; Awaluddin, Amir; Syahrul, Jhon; Anita, Sofia; Merlinda
    Yogurt is popular dairy milk. It is usually packaged by HPDE or PET plastics because of simplicity. However, it has disadvantage that is migration of monomer such as carbonyl compound (formaldehyde or acetaldehyde) during stored. The mechanism of migration is accelerated by microorganism activities and acid content during stored in refrigerator. Method used in this research was UV-Vis Spectrometry using Schiff’s reagent. The result showed that during stored, the concentration of formaldehyde in samples increased after 20 days of HPDE and 60 days of PET. It was found that the highest concentration of formaldehyde after 70 days stored was 3.250 mg/L of HDPE and 1.488 mg/L. Based on ICPS, UN (ILO, UNEP and WHO), the concentration limit of formaldehyde in food is 1 mg/L. It concluded that yogurt packaged by HDPE and PET is not safe after 70 days stored
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    APLIKASI FOTOKATALIS MnO/KARBON AKTIF DAN MnO/BENTONIT UNTUK DEGRADASI BIRU METILEN
    (Elfitra, 2023-07) Syafitri, Ardhea; Awaluddin, Amir; Sophia, Halida
    Photocatalysis is one of the alternative methods for treatment of textile waste. One of the synthetic dyes that is often used in the textile industry is methylene blue dye. The coloring process in textiles uses synthetic dyes in large enough quantities and is very stable so that it is difficult to degrade naturally. It is necessary to study the degradation process with effective and efficient methods in degrading methylene blue. The purpose of this investigation is to study the degradation methylene blue using MnO/Activated Carbon and MnO/Bentonite by photocatalyst method. The photocatalytic activity of MnO/Activated Carbon and MnO/Bentonite composites has advantages in the methylene blue degradation process both in acidic, neutral and alkaline pH conditions. Based on the results, it can be concluded that the optimum condition of the MnO/activated carbon composite for methylene blue degradation is at a catalyst mass of 35 mg, solution conditions at pH 9 and a methylene blue concentration of 50 ppm, the maximum degradation of methylene blue is 97.04%. The optimum condition of the MnO/Bentonite composite for methylene blue degradation is at a catalyst mass of 25 mg, solution conditions at pH 9 and a methylene blue concentration of 12.5 ppm, the maximum degradation of methylene blue is 83.69%.
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    DAYA ADSORPSI BIRNESSITE SINTESIS TERHADAP LARUTAN ION LOGAM Cd2+
    (2013-03-07) Rofina, Ega; Awaluddin, Amir; Sophia, Halida
    Birnessite can be used as an adsorbent of heavy metals found on the aquatic environment and solid waste. This could occur because birnessite is a porous material with a large surface area and are able to exchange cations from the solution. This research focuses on the removal of Cd ion from synthetic solution using the batch method. The removal Cd ions have been studed intensively for decade due to the toxic effect on environment and living organisms. To date, a number of methods have been developed to minimize the concentration of Cd ions in the environment, one of which is through adsorption method. The experimental results indicated that the synthetic birnessite has high affinity toward Cd2+ ion solution. To optimize the adsorption capacity of the birnessite, a wide range of experimental procedures are studied such as the differences of contact time, concentration, adsorbent weight, temperature, and pH. The uptakes of the ions by the adsorbent were monitored using atomic absorption spectroscopy (AAS) and were modelled using two types of isotherm adsorption. The thermodynamic parameters were calculated using the equation found in literature. The results showed that the optimum conditions for birnessite adsorption for Cd2+ ions are as follows: contact time of 5 minutes, pH of 6, optimum concentration of 8.4675 mg/L, temperature of 600C, adsorbent weigh of 0,5 gram with adsorption capacity of 95,63%. The adsorption Cd ions onto birnessite follows the Freundlich isotherm models. The adsorption is physical adsorption (physichsorps) with the value of ΔH and ΔS of 8,7713 kJ / mol and 1,9621 J / mol K, respectively. The positive value of ΔH indicates that the reaction is endothermic whereas positive ΔG (0,282 kJ / mol), shows the reaction is not spontaneous
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    DEGRADASI LIMBAH CAIR PABRIK KELAPA SAWIT DENGAN KATALIS MANGAN OKSIDA MELALUI TAHAP ADSORPSI MENGGUNAKAN FLY ASH TERAKTIVASI MICROWAVE
    (perpustakaan UR, 2021-08) Nopriyani, Indri; Awaluddin, Amir; Tamboesai, Emrizal Mahidin
    Palm oil mill effluent (POME) was considered to be harmful as it contains high COD. It requires immediate treatments before it discharges into the environment. The existing treatment systems are time-consuming (100-120 days), obsolete and needs large pond areas. In this study, a Fenton-based advanced oxidation process was introduced and studied, along with the pre-treatment process via adsorption using activated fly ash. The ash was prepared from fly ash produced from the burning process of oil palm shells and was activated using a home-made microwave. The Fenton process was realized using a Birnessite-type manganese oxide heterogeneous catalyst. The composition ash was determined by XRF. The results of XRF showed that fly ash contained SiO2 compounds of 40.78% and increased after activation to 62.85%. .The POME quality following the treatment process was monitored with the measurement of COD. The result showed that the maximum reduction in COD concentration in this tandem process was 68.89% obtained at 25 mg of the adsorbent, diluted waste POME concentration (10:90, v/v), and H2O2 concentration of 17,000 mg/L in 60 minutes.
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    DEGRADASI LIMBAH CAIR PABRIK KELAPA SAWIT OLEH KATALIS δ-MnO2 MENGGUNAKAN TAHAP PRE-TREATMENT DENGAN ADSORBEN FLY ASH TERAKTIVASI HCl
    (perpustakaan UR, 2021-08) Handayani, Syahfitri; Tamboesai, Emrizal Mahidin; Tamboesai, Emrizal Mahidin; Awaluddin, Amir
    Fresh Palm oil mill effluent (POME) is a thick brownish colour in the viscous and colloidal suspension, having an unpleasant odour and high value of BOD and COD, thus sensitive to environmental issues. The most widely used ponding systems for POME treatment have to ways such as long hydraulic retention time (HRT), obsolete, and require large area pond. Alternative treatment systems need to be introduced and studied to anticipate incoming problems associated with the limitations of the current system. In this study, the adsorption-degradation process was investigated for the treatment of the POME. The adsorption process was conducted using the adsorbent of palm oil fly-ash activated with HCl solution at a temperature of 105 oC for 24 hours. The composition of activated ash was determined by X-ray fluorescence (XRF) and contains SiO2 (47.778%), CaO (20.646%), K2O (6.041%), P2O5 (12.586%), MgO (6.324%) and Fe2O3 (4.304%). The adsorption process was able to reduce 37.50% of the initial COD value using 0.025 mg/L mg of activated fly ash, POME volume 100 ml for 15 minutes of reaction time. Whereas the degradation of POME following the adsorption process by layer birnessite (δ-MnO2) catalyst, H2O2 concentration of 17,000 mg/L and POME volume 20 mL in 60 minutes further reduced 61.33% of COD value. These tandem processes seem to be promising to tackle the POME issue in near future
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    DOPING MnO2 DENGAN 2 METODA BERBEDA DAN PENGARUHNYA PADA DEGRADASI METILEN BIRU
    (wahyu sari yeni, 2019-08-15) Sari, Wulan Kurnia; Awaluddin, Amir
    Manganese oxide as cryptomelane type was synthesized by citric acid sol gel. The effect of doping method between Co-MnO2 has been studied. The purpose of this research is to determine the catalitic activity of Co-MnO2 in methylene blue degradation. The characterization of Co-MnO2 catalyst was evaluated using X-ray Diffraction (XRD), Scanning Electron Microscopy-Energy (SEM) and Atomic Absorption Spectrophotometer (SSA). The morphology of Co-MnO2 catalyst was irregular. Catalitic activity Co-MnO2 type cryptomelane which doping with Co metal ion using method A was 76.839 % at 120 minutes and using method B was 78.173% at 120 minutes. The conclusion of this research that method A more effective than method B.
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    EKSPLORASI BAKTERI PROBIOTIK PADA MAKANAN TRADISIONAL PEKASAM DI KABUPATEN KUANTAN SINGINGI
    (2013-02-20) Awaluddin, Amir; Zul, Delita; Pato, Usman
    Penduduk di Negara-negara maju, kni lebih hati-hati untuk menentukan jenis makanan apa yang akan di konsumsinya. Selain cita rasa, merekan juga mulai mempertimbangkan efek dari makanan tersebut untuk kesehatan dalam jangka pendek maupunjangka panjang, serta memikirkan dampak dari proses produksi makanan tersebut terhadap kelestarian lingkungan. Makanan yang berkembang dari kebudayaan suatu daerah pada kurun waktu yang cukup lama disebut dengan makanan tradisional. Indonesia memiliki berbagai jenis makanan tradisional yang sangat potensial di kembangkan dalam meningkatkan gizi masyarakat serta menggali pengetahuan tradisional masyarakat untuk dikembangkan menjadi produk yang memiliki nilai ekonomi lebih tinggi.
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    IMPREGNASI KOH PADA CANGKANG KERANG DARAH (Anadara granosa) YANG DIKALSINASI SUHU 900°C SEBAGAI KATALIS HETEROGEN DALAM PRODUKSI BIODIESEL
    (2016-05-16) Afandi, Trisno; Nurhayati; Awaluddin, Amir
    CaO is a basic catalyst which is frequently used for the synthesis of biodiesel. The development of catalyst especially CaO has become attractive topic for research in order to obtain good catalytic activity so that biodiesel produced will be increased. In this study, the CaO was synthesized from decomposition reaction of blood cockle shell at 900°C for 5 hours. KOH was impregnated into CaO by simple wet impregnation method (percentage K: 1%, 3% dan 5% (w/w) CaO). The catalyst was then characterized by XRD, adsorption methylene blue, Atomic Absorption Spectrophotometer and titration. The activity of catalysts was tested by synthesis of biodiesel using waste cooking oil as feedstock at weight of catalyst 3%, mole ratio of oil:methanol 1:6, temperature of reaction 60°C for 3 hours. Biodiesel produced by blood cockle shell catalyst without impregnation was 82,53%, while biodiesel produced by blood cockle shell catalyst impregnated KOH 1%, 3%, and 5% were 77,96%, 74,94%, and 81,5% respectively
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    KINERJA KATALIS MANGAN OKSIDA CRYPTOMELANE UNTUK DEGRADASI METILEN BIRU
    (2016-10-19) Mulyati, Rike; Awaluddin, Amir; Sophia, Halida
    Methylene blue (MB) is a useful dye, which is commonly used in texstil, paint and biology. Methylene blue is toxic to living organism because methylene blue in environment is difficult to degradation and requires a long time. Methods Advanced Oxidation Processes (AOP) has been applied succesfully to remove methylene blue. This research focuses on the use of manganese oxide cryptomelane structure to the degradation methylene blue using AOP tecnique. Manganese oxide was synthesized by sol-gel method using KMnO4 and citric acid. The characterization results X-ray diffraction (XRD) indicated manganese oxide obtained was cryptomelane. Scanning emission misroscopy (SEM) result sample has diameter of 2-10 μm and shape cotton. The best performance cryptomelane catalyst for degradation MB was using cryptomelane catalyst 100 mg, with the percent degradation methylene blue was 79.23% at 120 minutes.
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    Metanolisis Minyak Kelapa Dengan Menggunakan Katalis Padat (Caco3) Untuk Produksi Cocodiesel
    (2016-02-25) Wahyuningsih, Slamet; Padil; Awaluddin, Amir
    Indonesia adalah negara tropis yang memiliki berbagai jenis tanaman yang dapat dikembangkan menjadi sumber energi alternatif. Salah satu sumber energi alternatif adalah biodiesel. Biodiesel dapat dibuat dari minyak kelapa sehingga disebut dengan cocodiesel. Penelitian ini mempelajari kondisi optimum dalam memproduksi cocodiesel melalui reaksi metanolisis antara minyak kelapa dan metanol dengan menggunakan bantuan katalis padat kalsium karbonat (CaCO3) yang telah dipijarkan pada suhu 900oC selama 1,5 jam. Untuk memperoleh kondisi operasi optimum dalam memproduksi cocodiesel, dilakukan variasi waktu reaksi metanolisis (1,0; 1,5; 2,0; 2,5; 3,0 jam), suhu reaksi (40oC; 50oC; 60oC; 70oC; 80oC), konsentrasi katalis (1,0; 1,5; 2,0; 2,5; 3,0 %) dan rasio molar metanol/minyak kelapa (4:1; 6:1; 8:1; 10:1; 12:1). Dari hasil penelitian, diperoleh kondisi operasi optimum untuk memproduksi cocodiesel adalah waktu reaksi metanolisis selama 1,5 jam, suhu 60oC, konsentrasi katalis 2% dan rasio molar metanol/minyak kelapa 1:8 menghasilkan konversi tertinggi sebesar 75,02%. Densitas cocodiesel yang dihasilkan dari penelitian adalah 860 kg/m3, viskositas kinematik 2,44 mm2/s, titik nyala 110oC, angka setana 65,94 , kadar air 0,039%-v, angka asam 0,049 mg KOH/g dan angka iod 6,35 gr Iod/100 gr. Berdasarkan data analisis tersebut, maka cocodiesel yang dihasilkan dari penelitian memenuhi kualifikasi sebagai bahan bakar.
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    PAVING BLOK GEOPOLIMER DARI FLY ASH LIMBAH PABRIK
    (2016-07-21) Aman; Awaluddin, Amir; Ahmad, Adrianto; Olivia, Monita
    Produksi semen menghasilkan emisi gas rumah kacadi atmosfer yang menyebabkan pemanasan global . Oleh karena itu , para peneliti saat ini fokus pada penggunaan material limbah yang memiliki sifat semen, yang dapat ditambahkan dalam beton sebagai pengganti sebagian semen , tanpa mengorbankan kekuatan dan daya tahan . Hal ini akan mengakibatkan penurunan produksi semen sehingga dapat mengurangi emisi gas rumah kaca , selain itu dapat mengurangi jumlah limbah. Dengan demikianbeton geopolimer adalah muncul sebagai beton inovatif yang dihasilkan dari reaksi bahan yang kaya sumber silika alumina dengan cairan alkali. Dalam penelitian ini dibuat paving block geopolimer dengan komposisi pasir : (fly ash+aktivator) = 3:1. Aktivator yang digunakan adalah NaOH dengan konsentrasi 14 M dan sodium silikat (Na2SiO3),rasio NaOH dan Na2SiO3 sebesar 2, variasi liquid aktivator terhadap fly ash 0,5 , 0,7 dan 0,9.Temperatur curing (60-100oC). Hasil yang didapat menunjukan kuat tekan paving blok tertinggi 18,18MPa pada rasio liquid to solid(L/S) 0,9 dan temperature optimum 80oC
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    PEMANFAATAN CANGKANG LOKAN (Geloina coaxans) UNTUK SINTESIS HIDROKSIAPATIT MENGGUNAKAN METODE PENGENDAPAN
    (2016-05-02) Maylinda, Nia; Awaluddin, Amir; Yanti, Pepi Helza
    The synthesis of hydroxyapatite (HAp) from seashell (Geloina coaxans) using precipitation method has been done . The seashell (Geloina coaxans) and H3PO4 were used as sources of calcium and phosphate. Molar ratio of precursor was 1.67. Product obtained was characterized using X-ray Diffraction (XRD) and FTIR. The results showed that the particle size of hydroxyapatite (HAp) using H3PO4 as precursor was 26.419 nm and degree of crystallinity was 89.90%. Analysis using FTIR revealed that hydroxyapatite (HAp) compounds have specific band of functional groups OH and PO43- in sample spectrum
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    PEMANFAATAN ENERGIANGIN PADA SISTEM PENGOLAH AIR GAMBUT
    (2013-03-07) Prayitno, Adhy; Awaluddin, Amir; Dalil, Muhammad; Anhar
    Air gambut adalah air yang terdapat di daerah deposit gambut. Air gambut pada dasarnya air tawar permukaan, karena mengalir dan berada diwilayah deposit gambut maka beberapa zat menjadi larut didalam air dan menyebabkan air menjadi berwarna coklat. Daerah Riau sebagian wilayahnya ditutupi oleh lapisan gambut sehingga air gambut terdapat disebagian besar wilayah Riau. Air gambut menjadi air baku utama untuk memenuhi kebutuhan air masyarakat. Dilihat dari sifat fisik dan kimiawi air gambut kurang baik untuk dikonsumsi karena warna dan sifat keasamannya yang relative tinggi. Pada musim kemarau air gambut mengalami kondisi yang lebih tidak baik lagi karena konsentrasi zat terlarut dan warna air menjadi keruh coklat. Persoalan lain yang dihadapi oleh masyarakat wilayah gambut adalah daya listrik yang belum tersedia. Sistem pengolah air gambut dengan memanfaatkan energi terbarukan telah berhasil diwujudkan. Tenaga angin dan tenaga potensial massa air digunakan sebagai penggerak utama system pengolah. Rancangan pompa dan sistem pengaduk pada instalasi absorben sepenuhnya menggunakan energi terbarukan tersebut. Gaya grafitasi berperan sebagai penghasil tekanan yang mendorong air melalui moduler penyaring sistem terbalik sehingga diperoleh air keluaran menjadi jernih dan tidak berwarna. Secara fisik diperoleh air yang bebas bau, tidak berasa, padatan terlarut <100 mg/l, kekeruhan 3,5 pada skala NTU, suhu + 3"C dari suhu lingkungan. Indikator kimiawi diperoleh nilaipHantara 5,9-6,7. sifat hantar listrik 0,5-3,4. Mineral terlarut belum diuji secara detail dan memerlukan pengamatan lanjutan sebagai pengembangan penelitian ini
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    PEMANFAATAN LEMPUNG ALAM MAREDAN SEBAGAI KATALIS HETEROGEN UNTUK PENGHILANGAN METILEN BIRU MELALUI PROSES FENTON
    (2-04-07) Hendru, Hendru; Awaluddin, Amir
    Methylene blue, commonly used dye in textile industry, is harmful to living organism and environment due to its resistance for degradation. The most effective method for dyestuff removal is heterogeneous catalyst based on Fenton reaction to produce OH radical. In this study, Maredan Clay (LM) can be used as a heterogeneous catalyst. The results of catalyst preparation were characterized by X-ray Diffraction (XRD), Fourier Transformed Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). Characterization results showed that catalyst contained quartz, kaolinite, muscovite and hematite minerals with morphology like irregular spheres. LM give optimum result in methylene blue removal under conditions of pH = 3, H2O2 = 6.7 mM, Fe-LM = 0.75 g/L, initial concentration = 50 ppm, at room temperature
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    Pemanfaatan limbah kelapa sawit menjadi kompos aktif
    (2013-04-01) Awaluddin, Amir; Warly, Lili; Prayitno, Adhy; Kadir, Hainim
    Masyarakat penerima program sawit rakyat yang berasal dari Pemerintah Daerah Kabupaten Siak, Propinsi Riau, merupakan masyarakat yang sangat miskin (Hainim, 2009). Dalam rangka mengurangi kemiskinan dan untuk pengembangan ekonomi kerakyatan, pemerintah daerah Kabupaten Siak meluncurkan program ekonomi kerakyatan yang disebut Program sawit rakyat yang dikelola oleh perusahaan daerah Kabupaten Siak yaitu PT. Permodalan Siak (PT. PERSI). Sejak berdiri pada tahun 2008, PT. PERSI telah menyalurkan program sawit rakyat kepada 4000 kepala keluarga (KK) miskin dengan total luas areal sawit 8.500 hektar. Namun hingga saat ini, program ini belum mampu meningkatkan taraf hidup petani sawit rakyat secara signifikan karena lahan yang digunakan untuk sawit termasuk lahan marjinal sehingga memerlukan biaya pemupukan yang cukup besar yaitu 45% dari total biaya produksi. Untuk itu, perlu dilakukan upaya strategis dan nyata agar peningkatan kesejahteraan petani sawit rakyat dapat segera ditingkatkan. Salah satu solusi yang dapat dilakukan adalah dengan memanfaatkan limbah hasil pengolahan kelapa sawit. Limbah hasil pengolahan kelapa sawit terdiri dari limbah padat : tandan kosong kelapa sawit (TKKS), serat kulit, cangkang, pelepah, limbah cair dan limbah gas. Limbah padat TKKS merupakan limbah utama yaitu 23 % dari proses pengolahan kelapa sawit (Fauzi, 2008). Selama ini pemanfaatan limbah TKKS sangat terbatas yaitu dibakar dalam incinerator, ditimbun (open dumping) dan dijadikan mulsa diperkebunan kelapa sawit (Sitorus, 2007 ).
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    PEMBUATAN KATALIS KOMPOSIT CTF-ZnFe2O4 DENGAN METODE IONOTHERMAL DALAM LELEHAN ZnCl2 DAN FeCl3.
    (2020-10) Prawiranegara, Barata Aditya; Awaluddin, Amir
    The CTF-ZnFe2O4 composite catalyst is a combination of two CTF (Covalent triazine framework) and ZnFe2O4 materials. CTF is an organic polymer material that has a triazine ring bond. ZnFe2O4 material is a mineral with a spinel structure composed of a combination of metal oxide molecules ZnO and Fe2O3. The material was successfully synthesized using the ionothermal method with FeCl3 and ZnCl2 as a solid solvent which was melted at 375oC. The CTF-ZnFe2O4 composite was made by mixing dicyanobenzene (DCB), FeCl3, and ZnCl2 salt with ratios of ZnCl2 and FeCl3 in one container then heated in a furnace tube flowed with Argon gas at 375oC within 24 hours. The identification and characterization of the material was carried out through the FT-IR and XRD tests. The resulting catalyst has characteristics compatible with CTF and ZnFe2O4. The FTIR peaks at wave numbers 1300 cm-1 and 1500 cm-1 indicate the triazine group in the material. While the peak is 18.21o; 30.11o; 35.26o; 42.91o; 56.67o; and 62.23o on XRD showed crystal peaks of ZnFe2O4.
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    PENGARUH ION LOGAM TEMBAGA (Cu+2) TERHADAP DAYA ADSORPSI BIRNESSITE SINTESIS
    (2013-03-07) Irmawati; Awaluddin, Amir; Sophia, Halida
    Heavy metals can cause serious environmental problem such as the detereatom of water quality and natural resources, therefore there should be a way to reduce them. The effect of heavy metals on environment requires immedate solution, thus minimizing the adverse effect that may arise. The adsorption method in this study, the synthetic birnessites have been applied to reduce the Cu2+ ion concentration from the synthetic solution. To optimize the adsorption, processes of several parameter adsorptions, such contact time, concentration of solution have been investigated using batch method. The concentration of Cu2+ ions adsorped in the birnessite was monitored by atomic adsorption spectroscopy (AAS). The result showed that the optimum conditions for birnessite adsorption for Cu2+ ions are 10 minute for contact time, concentration 8,0913 mg/L with adsorption percentages 98%, at 600C and pH 6. The process of adsorption Cu2+ ions on birnessite follows the Freundlich isotherm types. The adsorption is physical adsorption (physichsorps) characterized with the value of ΔH positive that is 18,053 kJ/mol and ∆S of 74,2606 J/molK. The ΔH positive value indicated that the reaction is endothermic with ΔG negative (-4,448 kJ/mol), so if can be concluded the reaction is spontaneous
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    PENGARUH KONSENTRASI HIDROGEN PEROKSIDA PADA DEGRADASI METHYLENE BLUE MENGGUNAKAN MANGAN OKSIDA YANG DISINTESIS DENGAN METODE SOL-GEL
    (2016-10-19) Dewi, Nismala; Awaluddin, Amir; Mukhtar, Akmal
    The manganosite type manganese oxide has been used for degradation of methylene blue using hydrogen peroxide (H2O2) on an oxidant. The manganese oxide has been synthetis using sol-gel method with KMnO4 and glucose as an reducted. The XRD result was the type manganosite (MnO) with the high level of crystalline. From SEM result manganosite structures with the morphology like cotton dots. The effect of hydrogen peroxide concentration on the degradation of methylene blue was by keeping other experimental parameter are concentration of hydrogen peroxide with reaction time 120 minutes, detected small degradation of methylene blue without the presentation of hiydrogen peroxide. The addtion of methylene blue increase degradation significant when added 10 ml hydrogen peroxide. However, no significant degradation when concentration of hydrogen peroxide was increased to 15 ml
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    PENGARUH PERLAKUAN ASAM DAN BASA TERHADAP KARAKTERISTIK DAN AKTIVITAS KATALITIK MnO2
    (2020-08) Safitri, Tika; Awaluddin, Amir
    The 2x2 tunnel cryptomelane type-manganese oxide has been successfully synthesized via sol-gel method using KMnO4 (oxidant) and C6H8O7 (reductant). The product was then treated with acid or base addition to conduct surface modification. This type of oxide has been reported as an effective catalyst for the degradation of organic wastes in the heterogeneous Fenton reaction, which is one of the Advanced Oxidation Processess (AOP). Acid and base treated cryptomelanes, referred to as HAccryptomelane and KOH-cryptomelane respectively, were characterized using X-ray Diffraction (XRD). The results indicated that both HAc-cryptomelane and KOHcryptomelane retained the cryptomelane phase without additional new phases. The assynthesized HAc-cryptomelane dan KOH-cryptomelane were then applied as catalyst for the degradation of methylene blue using H2O2 as an oxidant. KOH-cryptomelane catalyst displayed higher activity for methylene blue (MB) degradation than that of HAc-cryptomelane with 94.465% MB degradation within 60 minutes of reaction time.