DSpace 7

DSpace is the world leading open source repository platform that enables organisations to:

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Recent Submissions

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EFEK WAKTU IRRADIASI MICROWAVE PADA SINTESIS KARBON AKTIF PELEPAH KELAPA SAWIT
(Elfitra, 2023-12) Aulia, Anggi Dyang; Muhdarina
The oil palm fronds contribute the highest biomass compared to other parts of the oil palm. The biomass of oil palm fronds were transformed into activated carbon through a carbonization process (at a temperature of 600°C for 60 minutes), resulting as charcoal, namely APS. Subsequently, the APS was chemically activated with KOH (APS : KOH ratio of 1:1 [w/w]) and physically activated under microwave irradiation (at times of 1, 3, and 5 minutes) at a power of 300 W, yielding activated carbons denoted as A1D300, A3D300, and A5D300. The moisture and ash content, as well as the iodine adsorption capacity of both oil palm charcoal and activated carbon were determined in accordance with the Indonesian National Standard (SNI) No. 06-3730-1995. Similarly, their respective yields were also assessed. The research results were found that yields, moisture content, and iodine adsorption capacity decrease with increasing irradiation time, whereas ash content tends to increase. The yield for each activated carbon was significantly greater than that of APS charcoal. In contrast to APS charcoal, all activated carbons meet the moisture, ash, and iodine adsorption capacity standards specified in the referenced SNI. Among them, A1D300 stands out as the most effective activated carbon from oil palm fronds, exhibiting a yield of 85%, ash and moisture content of 0.9% and 7.6% respectively, and an iodine adsorption capacity of 809.2 mg g -1 .
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KARAKTERISTIK BIOCHAR PELEPAH KELAPA SAWIT PRODUK PIROLISIS PADA SUHU BERVARIASI
(Elfitra, 2023-12) Ulfa, Amelia; Muhdarina
The potential utilization of oil palm fronds as a raw material for biochar production is attributed to their composition of hemicellulose, cellulose, and lignin. This research is investigated the impact of pyrolysis temperature on the characteristics of the resulting biochar, adhering to the Indonesian National Standard (SNI) 06-3730-1995, encompassing parameters such as moisture content, ash content, volatile matter, and fixed carbon. Oil palm fronds were subjected to pyrolysis at varying temperatures of 500°C, 600°C, and 700°C for 60 minutes in a nitrogen gas stream. The research results was demonstrated that the pyrolysis temperature of oil palm fronds significantly influences the characteristics of moisture content, ash content, volatile matter and fixed carbon. The values were obtained exhibit an increasing trend with the elevation of temperature. The most optimal biochar identified in this study is designated as BPS500, featuring a moisture content of 0.76%, ash content of 6.85%, volatile matter content of 9.66%, and fixed carbon content of 82.71%, respectively. All these values align with the specifications outlined in the Indonesian National Standard (SNI) 06-3730-1995.
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OPTIMASI WAKTU KONTAK DAN KONSENTRASI ADSORBAT PADA PENJERAPAN TIMBAL(II) OLEH LEMPUNG ALAM MAREDAN
(Elfitra, 2023-12) Nazila, Alma; Mukhlis
The application of Maredan natural clay as an adsorbent has several advantages, such as lower cost, abundant availability and good adsorption efficiency. In this research, Maredan natural clay was used to adsorb lead in water. The purpose of this research was determine the optimum contact time and optimum concentration of adsorbate, the adsorption isotherm and adsorption kinetics model of the adsorbent in lead adsorption process using Maredan natural clay. The adsorption used batch method with contact time variations of 10, 20, 30, 40 and 50 minutes and variations in adsorbate concentration of 40, 60, 80 and 100 ppm. The concentration of adsorbate adsorbed was determined using AAS. Characterization of the adsorbent before and after adsorption process was carried out using a FTIR instrument to determine the bond vibrations and functional groups of Maredan natural clay. The optimum contact time and adsorbate concentration of this research was obtained at 20 minutes and adsorbate concentration of 40 ppm, with adsorption efficiency of 77,02%. The adsorption isotherm for lead adsorption using Maredan natural clay was found to follow the Langmuir isotherm with R2 coefficient of 0,9314. The kinetic model of this research followed a second pseudo order kinetic model with and R2 coefficient of 0,9992.
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KORELASI KEBASAAN PERMUKAAN DENGAN GUGUS FUNGSI ARANG AKTIF KULIT DURIAN
(Elfitra, 2023-11) Seftiana, Zenifa; Muhdarina
Durian skin waste (Durio zibethinus) which contains quite high levels of cellulose, lignin and carbon can be used as raw material for active carbon. In this research, the characteristics of active carbon synthesized from In this research, the characteristics of activated carbon synthesized from durian peel waste were studied using a furnace at a temperature of 700oC for 2 hours to obtain KADF and microwave at a power of 750 W for 75 seconds to obtain KADM. The characteristics of active carbon determined are basicity and surface functional groups. The results of the characterization show that the surface alkalinity of KADM activated carbon is higher than that of KADF. Likewise, the -O-H functional group in KADF is lost, while the other functional groups (C-H, C=C, C-O) show a lower percent transmittance compared to KADM activated carbon. These results show that physical activation using a microwave at 750 W for 75 seconds is better than using a furnace at 700 oC for 2 hours..
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KORELASI KEBASAAN PERMUKAAN DENGAN GUGUS FUNGSI ARANG AKTIF KULIT DURIAN
(Elfitra, 2023-11) Seftiana, Zenifa; Muhdarina
Durian skin waste (Durio zibethinus) which contains quite high levels of cellulose, lignin and carbon can be used as raw material for active carbon. In this research, the characteristics of active carbon synthesized from In this research, the characteristics of activated carbon synthesized from durian peel waste were studied using a furnace at a temperature of 700oC for 2 hours to obtain KADF and microwave at a power of 750 W for 75 seconds to obtain KADM. The characteristics of active carbon determined are basicity and surface functional groups. The results of the characterization show that the surface alkalinity of KADM activated carbon is higher than that of KADF. Likewise, the -O-H functional group in KADF is lost, while the other functional groups (C-H, C=C, C-O) show a lower percent transmittance compared to KADM activated carbon. These results show that physical activation using a microwave at 750 W for 75 seconds is better than using a furnace at 700 oC for 2 hours.. Keywords: alkalinity, functional groups, carbon active