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All Journal International Journal of Renewable Energy Development Jurnal Sains dan Teknologi Jurnal Pilar Sains Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Dinamisia: Jurnal Pengabdian Kepada Masyarakat Journal of Community Engagement Research for Sustainability Sagu
Silvia Reni Yenti
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Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mathematics Mechanical Engineering Nursing Physics Public Health Social Sciences Other

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Pengaruh Variasi Konsentrasi H2SO4 Dan Waktu Hidrolisis Dalam Pembuatan Glukosa Dari Bungkil Inti Sawit (BIS) Tri Lusi Lisa Dila; Silvia Reni Yenti; Sri Rezeki Muria
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Indonesia is the largest producer of crude palm oil (CPO), followed by Malaysia and Thailand. The area of Indonesian palm oil plantations produces palm kernel oil (PKO) and palm kernel cake (PKC) 8,573,886 tons / year. BIS has lignocellulose content, lignocellulosic structure can be converted to glucose and has the potential to become bioethanol which can meet Indonesia's energy needs. The objectives to be achieved in this research are to characterize PKC as a raw material and determine the best H2SO4 concentration and hydrolysis time in the manufacture of glucose. There are two stages in this research, namely delignification and hydrolysis. Delignification uses a base solvent with a concentration of 6% NaOH cooking process at a temperature of 100 oC and a reaction time of 1 hour. The results showed that the base treatment process was able to increase cellulose to 39.1%, hemicellulose 10.9%, and a reduction in lignin by 5.65%. Second, hydrolyzed using variations of H2SO4 (1, 2 and 3 M) and hydrolysis time (3, 4 and 5 hours) at a temperature of 100 oC. The highest sugar concentration was produced from the hydrolysis process at a concentration of H2SO4 3 M and a 5 hour hydrolysis time of 22.11 g / L. Keywords: glucose, hydrolysis, palm kernel cake
Kinetika Adsorpsi Pada Penjerapan Ion Timbal Pb2+ Terlarut Dalam Air Menggunakan Partikel Hydroxyapatite Fernando Susilo; Ahmad Fadli; Silvia Reni Yenti
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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This research are to observe the effect of mass adsorbent (hydroxyapatite) and temperature in adsorption of metal ions Pb2+ using adsorbent hydroxyapatite (HAp) and determine a suitable adsorption kinetics model. Pb2+ solution 9,982 mg/L of 500 mL where mixed with variation of mass HAp (0.3 g, 0.5 g and 0.9 g)  in a glass beaker while stirred with rate 100 rpm at variation temperature (27, 40, and 50 oC).Pb2+ solution was taken at a certain time, then the solution  filtered and analyzed by atomic absorption spectrophotometer (AAS). The result showed that the adsorption of metal ions is pseudo second order reaction with the higher mass of adsorbent and with lower temperature. In this research maximum constant value of adsorption kinetic was 0.2758 g/mg.min obtained with mass of adsorbent 0.9 g and temperature of 27 oC. While minimum value of adsorption kinetics constant 0.0389 g/mg.min obtained with mass of adsorbent  0.3 g and temperature of 50 oC.  Keywords:  Adsorption, Hydroxyapatite, Kinetic, Timbale.
Penentuan Massa dan Waktu Kontak Optimum Adsorpsi Karbon Aktif Dari Ampas Tebu sebagai Adsorben Logam Berat Pb Riki Irwandi; Silvia Reni Yenti; Chairul Chairul
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Bagasse is one of the agricultural or industrial waste that can pollute the environment. One effort to improve the economic value of the bagasse can be done with the process into activated carbon. This study aimed to examine the mass effect of activated carbone and the time contact of the bagasse activated carbon adsorption used for heavy metal Pb adsorbent, and to study the characteristics of the activated carbon produced, among others, ash content and moisture content. This research was conducted in three phases were the raw material preparation, the manufacture of activated carbon, and the adsorption of Pb in PbSO4 solution. Variations in the mass carbone used in this study were 1; 2; and 3 gram. As for the time variation adsorption used were 30; 60; 90; and 120 minutes. Percent adsorption is best obtained when the mass of activated carbone of 3 grams and the optimum time contact of 90 minutes is equal to 94,15 %.Keywords: adsorbent, bagasse, activated carbone, mass of activated carbone, adsorption time
Sintesis Zeolit 4A Menggunakan Abu Limbah Sawit Variasi NaOH Sebagai Pelebur Serta Variasi Volume Natrium Silikat Dan Natrium Aluminat Mimin lestari; Fajril Akbar; Silvia Reni Yenti
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Zeolite 4A is one of synthetic zeolite which is used as ion exchange. This zeolite can be synthesized from silica and alumina. In this reaearch , palm ash used as a source of silica. The aims of this research is produce zeolite 4A using palm ash and obtain the optimum process condition of synthesis zeolite 4A. The fusion of palm ash was done in furnace at temperature 500 ᴼC for 5 minutes with various of palm ash:NaOH (25:30 , 25:50 and 25:75 gram/gram). Synthesis perfomed with variation of ratio volume sodium silicate and sodium aluminate (55:45, 60:40 and 65:35 mL/mL). The product was characterized using spectrophotometry fourier transform infra red (FTIR) and X ray diffraction (XRD). Based on the result of characterization, the terbaik process condition was obtained at each variation that is the fusion of palm ash at ratio palm ash:NaOH 25:30 gram/gram and ratio volume sodium silicate and sodium aluminate 65:35 mL/mL.Keyword : palm ash, spectrophotometry FTIR, XRD, zeolite 4A
Adsorpsi Ion Logam Pb Dengan Menggunakan Karbon Aktif Kulit Durian Yang Teraktivasi Nuvicha Rizqi Yuniva Zikra; Chairul Chairul; Silvia Reni Yenti
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Lead (Pb) is purified so widely used by humans in a variety of activities. Environmental pollution by lead (Pb), mostly from human activities are extracting and exploiting these metals. One way to prevent environmental contamination that is the technique of adsorption using activated carbon from durian skin. Manufacture of activated carbon durian skin consists of sample preparation process, carbonization, activation with KOH, washing and sieving. Activated carbon durian skin with carbonization temperature 3200C for 2 hours, the activation is done by calcination at a temperature of 400oC for 2 hours with 0.1 N KOH activator and activated carbon filtration with a sieve size of 60, 80 and 100 mesh. From research conducted activated carbon has met the quality standards of quality according to SNI 06-3730-1995 activated carbon with a water concentration of 7.4%, 6.76% ash concentration, as well as the absorption of I2 solution of 576.95 mg/g. Activated carbon works very well in absorbing Pb where the sample was stirred with a speed of 140 rpm using the batch system. The contact time used after mixing is 60, 90 and 120 minutes. The size of the activated carbon from durian skin best for the entrapment of Pb is 100 mesh and 120 minutes contact time with the adsorbent adsorption efficiency reached 90.68%.Keywords: durian skin, adsorption, activated carbon, lead (Pb)
Adsorpsi Tembaga (Cu (II)) Menggunakan Limbah Cangkang Kepiting Rida Sari Juli Anti; Drastinawati Drastinawati; Silvia Reni Yenti
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Adsorption is one of the most widely used techniques for controlling water pollution. Adsorption kinetics are very important to determine the performance of the adsorbent and get the mechanism that occurs during the adsorption process. The purpose of this study was to determine the effect of metal concentration and adsorption time on crab shell absorption and to test the Cu (II)adsorption kinetics model using pseudo first order (Lagergren) and pseudo second order kinetics (Ho and McKay). Cu (II) solution with varying concentrations of 1,981 mg/l; 4,138 mg/l and6,263 mg/l are adsorbed using crab shells. The solution sample was taken with a time interval of 0, 10, 20, 30, 60, 90, 120 and 150 minutes as much as 10 mL then centrifuged. The centrifugedfiltrate is then analyzed using AAS to measure the remaining Cu (II) concentration. The results showed that the highest of adsorption capacity at the concentration of Cu (II) metal 1,981 mg/lwas 0,737 mg/g in the 30 minute; the concentration of 4,138 mg/l was 1,784 mg/g in the 60 minute and the concentration of 6,263 mg/l was 2,816 mg/g in the 90 minute. The fitted kineticmodel for Cu (II) adsorption using crab shells is pseudo second order model (Ho and McKay) with k2 value is 2,225; 1,432; 1,345 g/mg.min and qe value is 0,737; 1,784; 2,816 mg/g for aconcentration of 1,981; 4,138 and 6,263 mg/l.Keywords : adsorption, crab shells, Cu (II), adsorption capacity, kinetics.
kajian Metakaolinisasi Terhadap Sintesa Zeolit 4A Dari Kaolin Affandry Taufik; Fajril Akbar; Silvia Reni Yenti
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 1 (2014): Wisuda Februari Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Zeolite 4A can be used as alternative for replacing phosphate as builder of detergen. It can be synthesized from calcined kaolin. Kaolin in its natural state is less reactive and difficult to form zeolite 4A, threfore kaolin needs to be activated through calcination process. Calcination of kaolin were studied in variation of temperatures from 500˚C, 600˚C, 700˚C, and 800˚C. Sodium aluminate and sodium silicate used as reactants in reaction process of synthesis zeolite 4A mixed in 1, 2 and 3 hours, then heated at 80˚C for 8 hours. The samples were characterized by infrared spectroscopy. A calcination temperature of 700˚C ~ (2 hr) is the optimum for this kaolin to change into a reactive metakaolin which gives zeolite 4A with high crystallinity.                             Keywords: calcination, kaolin, metakaolin, synthesis, zeolite 4A
Pelapisan Hidroksiapatit Di Permukaan Stainless Steel 316L Menggunakan Metode Dip Coating Dengan Variasi Jumlah Hidroksiapatit Ulfah Naida Marbun; Ahmad Fadli; Silvia Reni Yenti
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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The 316L stainless steel is widely used as implant, but it still has some downsides such as low biocompatibility and it will release metal ion in the body. Therefore coating the surface of the metal with hydroxyapatite is done to resolve these problems. Coating thickness is an important parameter in the coating process. The purpose of this research is to study the effect of HA amount to the coating thickness. The procedurs in this research are making of HA slurry, substrate preparation, coating process, drying and sintering. The fixed variables in this research are 3 gram of polyethylene glycol, 54 ml of aquades, stirring rate of 300 rpm for 20 hours, immersion time is 10 seconds, drying at 110 °C for 30 minutes, sintering at 700 °C for 1 hour, one time dipping, substrate starilization for 15 minutes, and substrate drying at 110 °C for 10 minutes. The changeable variable is the amount of HA as much as 18 and 24 gram. This study concluded that the more amount of HA used, the thicker coating thickness achieved. The HA coating thickness achieved in this research are in the range of 126-223 μm.Keywords: coating thickness, dip coating, hydroxyapatite, 316L stainless steel.
Penggunaan Zeolit Alam Teraktivasi Sebagai Katalis Pada Proses Esterifikasi Gliserol Dari Produk Samping Biodiesel Menjadi Triacetin Dwi Yuni Ernawati; Zuchra Helwani; Silvia Reni Yenti
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Glycerol is a byproduct of biodiesel production by transesterification process which generated approximately 10% of the total production of biodiesel. Increasing the amount of glycerol is not accompanied by glycerol treatment process itself. Hence the need for the processing of glycerol into other materials or products that are more economic value. One of them with the process into triacetin. Triacetin can be produced from the reaction of glycerol and acetic acid using an acidic catalyst. Triacetin usefulness pretty much both for food and non-food. The objective of this study was to study the effect of ratio of reactant and consentration of catalyst on glycerol conversion on triacetin. This research was conducted with the reactants ratio 1: 3; 1: 5 and 1: 7, catalyst concentration of 2%, 4%, and 6% of the weight of acetic acid, reaction temperature of 100 °C and reaction time of 4 hours. From the analysis of the results showed that the increase in ratio of esterification of the reactants and catalyst concentration affect the conversion of glycerol into triacetin. The optimal reaction conditions on the reactant ratio of 1: 7 and the concentration of catalyst 4% of the weight of acetic acid with 82.89% conversion rate.Kata kunci: asam asetat, gliserol, optimum, reaktan, triacetin.
Adsorpsi Pospat (PO4-3) Limbah Cair Laundry (Artificial) Menggunakan Arang Aktif Dari Tongkol Jagung Dengan Variasi Massa Arang Aktif Dan Temperatur Adsorpsi Arianty Septia Ningsih; Syamsu Herman; Silvia Reni Yenti
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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The development of laundry services has an impact on the volume of wastewater from laundry activities which has also increased. Disposal of laundry waste containing phosphate is 9.9 ppm while the limit on water emissions is 1 ppm so that the presence of excessive phosphate in the laundry liquid waste causes eutrophication. On the other hand, corn cobs waste is agricultural waste that can be processed into activated charcoal which is then applied as an adsorbent. Therefore, this study aims to find a solution to the two problems above by making the corncob as an adsorbent material for handling phosphate waste. This study shows the effect of activated charcoal mass from corn cobs waste on phosphate adsorption in laundry liquid waste and the effect of stirring temperature on the phosphate adsorption process of laundry liquid using activated charcoal from corn cobs waste as an adsorbent. The first determines the equilibrium time by means of 2 grams of activated charcoal put into a beaker glass with a Na3PO4 (500 ml) solution at a speed of 100 rpm. After the time is obtained, the equilibrium is only made for another variable. From this study, it was found that the active charcoal mass of corn cobs which best absorb Pospat solution was 3 grams and the best temperature at 50oC with adsorption efficiency of 63.30%.Keywords: activated charcoal, adsorbent, waste, phosphate, corn cobs
Co-Authors Ade Sri Umaiyah Adli Satria Sandika Affandry Taufik Ahmad Fadli Ahmad Fadli Ajma Nouri Alfarisi, Cory Dian Alfarizi, Cory Dian Amun Amri Arianty Septia Ningsih Astrandana, Yudi Azridjal Aziz Barus, Surya Danta Alberto Chairul Chairul Chairul Chairul Chatarina Umbul Wahyuni Dedi Meier Silaban Desi Heltina Drastinawati Drastinawati Drastinawati Drastinawati, Drastinawati Dwi Yuni Ernawati Erika Rezi Yuliestri, Erika Rezi Evi Nadhifah Fajril Akbar Febriansyah, Beni Fernando Susilo Frederika Mawarni Adilasari Nduru Frimacia, Tifanny Gery Azhari Putera Haris, Al Hendro Ekwarso Idral Amri Lanie Faradina M Satria Haruda Mimin lestari Mutamima, Anisa Nainggolan, Ira Tri Asi Br. Nisa, Aidina Fahrun Nur Irfana Mardiyah Nurwijayanti Nuvicha Rizqi Yuniva Zikra Purnama, Indra Rafly Rafly Reny Nur Hidayah Retno Khimantoro reyra, Anilza Silvi Rida Sari Juli Anti Riki Irwandi Rozanna Sri Irianty Rozanna Sri Irianty Sari, Ronna Puspita Shintia Oktaviani Sri Rezeki Muria SUNARNO Sunarno Sunarno Syamsu Herman Syarfi Daud Toni Ardi Tri Lusi Lisa Dila Triani, Leni Ulfah Naida Marbun Utama, Panca Setia Villarul, Trya Nungky Wahyu Mey Riswanto Widodo, Prio Wisrayetti, Wisrayetti Yelmida Azis Yuanita, Mira Yuliana Yuliana Zuchra Helwani Zultiniar, Zultiniar