Article Per Year (5 Year)
p-Index From 2021 - 2026
0.983
P-Index
This Author published in this journals
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
Unknown Affiliation
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

Published : 45 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 45 Documents
Search

 1   2   3   4   5 
Penentuan Model Kesetimbangan Adsorpsi Ion Fosfat (PO4-3) Menggunakan Arang Aktif Tongkol Jagung Dengan Variasi Massa Arang Aktif Dan Kecepatan Pengadukan Nainggolan, Ira Tri Asi Br.; Herman, Syamsu; Yenti, Silvia Reni
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

One of contamination of laundry liquid waste containing phosphate causes negative impact on society lives. One of efforts to reduce phosphate in laundry wast is adsorption process. The purpose of this study is to find out the effect of absorbent active charcoal mass from the corn cobs and stirring speed and to determine the equilibrium model for phosphate adsorption.First, to determine the equilibrium time with 2 grams of active charcoal in a beaker glass with Na3PO4 solution ( 100 mL ) with 200rpm stirring speed, equilibrium time has been obtained before other variables.The more active charcoal mass of corn cobs and stirring speed of adsorption, the less reaming of phosphate concentration.At 100 rpm speed, 1 gram mass, 2 grams and 3 grams of phosphate concentration after 7,105 ppm, 5,521 ppm, 5,015 ppm absorption.At 200 rpm stirring speed for 1 gram mass, 2 grams and 3 grams of phosphate concentration after 7,065 ppm, 4,474 ppm and 2,134 ppm. At 300 rpm stirring speed for 1 gram mass, 2 grams and 3 grams of phosphate concentration after 5,140 ppm, 3,121 ppm and 2,090 ppm absorption. The mechanism of phosphate adsorption of corn cobs active charcoal powder is compatible with Freundlich Isotherm model which represents the physical adsorption with (R2) 0,999 factor correlation value.Keywords : adsorption, active charcoal, laundry waste, phosphate, equilibrium model.
Pengaruh Massa Dan Ukuran Partikel Adsorben Daun Nanas Terhadap Efisiensi Penyisihan Fe Pada Air Gambut reyra, Anilza Silvi; Daud, Syarfi; Yenti, Silvia Reni
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Peat water is surface water are blackish brown and metals Fe which requires effective and efficient processing to be worthy for use by the public. Various types of adsorbents continue to be developed, one of which is the pineapple leaf adsorbent. The purpose of this study was to determine metal removal efficiency of Fe in the peat water, calculating the adsorption capacity and determine the appropriate type of isotherm. Fixed variables used in this study is the stirring speed of 120 rpm and a contact time of 90 minutes. For independent variables used consisted of adsorbent mass variation of 1,5; 2; 2,5; 3 g and a particle size variation 80, 100 and 120 mesh. Removal efficiency of Fe metal concentrations higher 76,14% by mass of adsorbent 3 g with a particle size of 120 mesh. Metal adsorption capacity of Fe achieved the highest on the mass of 1,5 grams with a particle size of 120 mesh amounted to 0,092 mg Fe / g . Types of adsorption isotherms corresponding to Fe by pineapple leaf adsorbents is Freundlich isotherm with R2 values of 0,927 for Fe.Keywords : Adsorption, Adsorbent, Peat Water, pineapple leaf
Pemurnian Bioetanol Hasil Fermentasi Nirah Nipah Menggunakan Proses Destilasi-Adsorpsi Menggunakan Adsorben CaO Villarul, Trya Nungky; Chairul, Chairul; Yenti, Silvia Reni
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The rapid rate of world population growth conduces demand and supply of fuel is not balance. So that, energy reserves has been depleted in large numbers. Especially fossil fuels which is a main energy. The government has compiled program and policy for development of bioethanol and biodiesel to resolve energy crisis in indonesia which targeted in 2025 can be approximately 15-20% fuels need to fulfill transportation sector and the national industry. This research aims to produce bioethanol fuel grade-adsorption using distillation methods, determine the effect of the ratio of CaO : bioethanol and height of the adsorbent in the column for producing bioethanol fuel grade. The raw material is bioethanol from nipa sap fermentation results with 13% ethanol content. Ethanol content obtained not too high previously, so that should be took a process that can be increase the purity of bioethanol with distillation process-adsorption. This research divided into two stages . First stage is nipa sap bioethanol distiled up to 96% concentration and second stage is distillation-adsorption using CaO adsorbent. Independent variables on this research is ratio of CaO : bioethanol and a particle size of adsorbent in the adsorption column. The most influence process to review bioethanol purification is distillation-adsorption CaO with ratio : bioethanol 1 : 2 and a particle size of adsorbent is 200 mesh cm with purity of 99,7% and had been categorized fuel grade bioethanol.Keywords: CaO, bioethanol, distilation- adsorption process, nypa
MODEL KESETIMBANGAN PADA ADSORPSI ION KADMIUM MENGGUNAKAN HIDROKSIAPATIT DARI KULIT KERANG DARAH Yenti, Silvia Reni; Fadli, Ahmad; Drastinawati, Drastinawati; Zultiniar, Zultiniar; Nisa, Aidina Fahrun
Jurnal Sains dan Teknologi Vol 17, No 1 (2018): Jurnal Sains dan Teknologi
Publisher : Fakultas Teknik Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (22.439 KB) | DOI: 10.31258/jst.v17.n1.p9-15

Abstract

Pencemaran logam berat kadmium (Cd2+) di perairan mengakibatkan kerusakan yang besar bagi kehidupan manusia. Salah satu cara untuk menghilangkan dan mengurangi logam cadmium adalah menggunakan proses adsorpsi. Larutan kadmium (Cd2+) 3mg/L sebanyak 200 mL ditambahkan HAp 0,5 gr dan diaduk dengan kecepatan 100, 200 dan 300 rpm pada suhu 30°C, 40°C dan 50°C. Larutan kemudian dianalisa menggunakan Atomic Adsorption Spectroscopy (AAS) untuk mengetahui konsentrasi kadmium. Semakin besar suhu adsorpsi maka kapasitas penjerapan adsorben HAp (Qe) semakin kecil. Semakin besar kecepatan pengadukan adsorpsi, maka semakin besar pula kapasitas penjerapan adsorben HAp (Qe). Mekanisme adsorpsi logam kadmium (Cd2+) menggunakan HAp memiliki kecocokan dengan model isotherm Freundlich yang mewakili adsorpsi fisika dengan kapasitas panas adsorpsi (ΔH) sebesar -1,665304 kcal/mol.K dan perubahan entropi (ΔS) didapatkan sebesar 15,76 J/mol.K.
Catalytic Co-Pyrolysis of Palm Oil Empty Fruit Bunch and Coal into Liquid Oil Sunarno, Sunarno; Sari, Ronna Puspita; Frimacia, Tifanny; Yenti, Silvia Reni; Utama, Panca Setia; Saputra, Edy
International Journal of Renewable Energy Development Vol 11, No 2 (2022): May 2022
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2022.42193

Abstract

The decline in fossil fuel sources has prompted research into finding renewable fuels. One of environmentally friendly energy sources with high efficiency is by producing liquid oil from palm oil empty fruit bunch (EFB) and coal. Pre-treatment of empty fruit bunches using NaOH and various concentrations of H2O2, various ratios of EFB/coal, the ratio of CaO catalyst, chemical and physical characteristics were studied to produce the better liquid oil yield. The H2O2 concentrations are 0%, 1%, 2%, and 3%. The ratios of EFB/coal (R) are 0/100, 25/75, 50/50, and 75/25. The ratios of catalyst CaO/raw material are 0%, 3%, 6%, and 9%. It ran at 400 °C with 100 mL/min nitrogen gas flowing during one hour. The results showed that adding sodium hydroxide and hydrogen peroxide in the EFB pre-treatment increased the liquid oil yield. With an increase in the EFB/coal ratio, the liquid oil yield increased. Co-pyrolysis treated EFB and Coal with a ratio of 75:25 produced 32% liquid oil yield, but the liquid oil yield decreased to 19% with the addition of 9% CaO catalyst. However, the addition of CaO catalyst reduces the acidity and increases the calorific value of the liquid oil.
Produksi Bioetanol Dari Bungkil Inti Sawit Dengan Proses Fermentasi Nur Irfana Mardiyah; 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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Indonesia is a country with a growing human population, causing the need of energy also increases. Bioethanol has been widely used in transportation as a fuel that is increasingly reduced. Palm kernel expeller has a high enough potential to be developed into an alternative energy source, namely bioethanol because of its lignocellulosic content. The purpose of this study was to determine the composition of yeast in the fermentation process, and determine the optimal processing time for the formation of bioethanol in the Hydrolysis and Separate Fermentation (SHF) method. The stages in this study were the hydrolysis of palm kernel expeller using H2SO4 3M for 5 hours at 100 oC. The fermentation process is carried out with variations in time for 24 hours, 48 hours, 72 hours, 96 hours and 120 hours. The fermentation process is carried out with variations composition of yeast for 4 g/L, 6 g/L, dan 8 g/L. The results showed that in the fermentation using a sugar concentration of 22,11 g/L, obtained an optimal fermentation in 2,5 % (v/v) or 19,73 g/L at 6 g/L composition of yeast and 96 hours time on fermentation. The greater the concentration of Saccharomyces cerevisiae and the longer fermentation time, the more bioethanol is obtained. Keywords: Bioethanol, fermentation, palm kernel expeller, Saccharomyces cerevisiae,.
Fermentasi Kulit Nanas Menjadi Bioetanol Menggunakan Zymomonas Mobilis Dengan Variasi Pemekatan Medium Dan Waktu Fermentasi Adli Satria Sandika; Sri Rezeki Muria; Silvia Reni Yenti
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The high dependence of fuel resource such as oil, coal, and gas will influence the depletion of fossil resources (oil, natural gas, and coal). Therefore, it is important to study conversion of pineapple peel to bioethanol as renewable energy to overcome dependence on fossil fuels. This research was conducted the fermentation of pineapple peel with concentrated medium variation to obtain high concentration of bioethanol. This work is aimed to study of bioethanol production from pineapple peel with concentrated medium variation with Zymomonas mobilis to increasing the concentration of the sugar inside the medium to obtain maximum conditions on producing bioethanol. Fermentation was conducted in 2 Liter fermentor with variations of fermentation time from 12 ; 24 ; 36 ; 48 ; 60 ; 72 until 84 hours respectively and concentratedmedium variation from 15% ; 20% ; 25% until 30%. respectively. The concentration of bioethanol was increased by increasing of concentrated medium variation. Maximum conditions of bioethanol production from pineapple peel were shown having 30%concentrated medium variation, and fermentation hours 60th about 8,79 % v/v.Keywords: bioethanol, concentrated, pineapple peel, Zymomonas Mobilis
Pengaruh Konsentrasi Tween 80 Pada Sakarifikasi Dan Fermentasi Serentak Pati Sorgum Menjadi Bioetanol Ajma Nouri; Chairul Chairul; 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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The growing energy needs of Fuel (BBM) in the world are experiencing the limitations of the natural resources of raw materials in the form of fossil fuels are declining. To meet the needs of fuel need to be developed for non-fossil fuels. One type of vegetable fuel (BBN) is bioetanol. Raw materials that are potentially as bioetanol one is sweet sorghum (Sorghum bicolor l. Moench). Starch sorghum can be converted into glucose and then by using the help of microorganisms are converted into bioetanol. The methods used in this research is the process of sakarifikasi and the fermentation is done simultaneously (SSF) in 2-Litre fermenters. Sampling is conducted during the process of hidrolisa by using StargenTM enzyme and fermentation at specific time intervals to analyze levels of ethanol and sugar levels. Test your sugar levels reduction done by the method of Nelson-Somogy, alcohol concentration testing using the tool alkoholmeter. The purpose of this study was to determine the influence of the concentrations of Tween 80 and the fermentation time against levels of ethanol produced. Starch fermentation process conditions of sorghum with the variation of the concentrations of Tween 80 (0.5%; 1%; 0.9%; 2% and 2.5%) at each sampling time (36; 24; 48; 60, 72 and 96 h). The fermentation process takes place in the anaerobic conditions of operation pH (4.5) speed of 200 rpm and pengadukkan at room temperature. The best fermented indicated on condition of addition of enzyme concentration of 2.5%, the fermentation time 72 hours with the resulting ethanol concentration of 8% (v/v).Keywords: Bioetanol, Fermentation, starch sorghum, StargenTM 002, Tween 80
Model Kesetimbangan Adsorpsi Logam Tembaga (Cu (II)) Menggunakan Cangkang Kepiting Sebagai Adsorben Reny Nur Hidayah; 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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Copper metal pollution (Cu (II)) in the water has a negative impact on people's lives. One effort to reduce the copper metal content is by the adsorption process. The purpose of this study was todetermine the effect of adsorption temperature (30, 40, 50 ° C) and adsorbate concentration (2, 3, 4 mg / L) and to test the adsorption isotherm equilibrium model on the adsorption Cu (II) bycrab shell by model equation approach Langmuir and Freundlich. The results showed if the adsorption temperature rise, the adsorbent adsorption capacity of crab shells (qe) is decreasedand if the concentration is decreased, the adsorbent adsorption capacity of crab shells (qe) is increased. The highest absorption rate was obtained at 30 ° C with a concentration of 4 mg / Lof adsorbate at 1.558 mg / g. The copper metal adsorption mechanism (Cu (II)) by the crab shellhas a match with the Freundlich isoterm model which represents the physical and adsorption Freundlich isoterm model which represents the chemical adsorption.Keywords: Adsorption, Crab Shell, Equilibrium Model, Copper (II)
Pengaruh ph Dan Waktu Reaksi Pada Sintesis Hidroksiapatit Dari Tulang Sapi Dengan Metode Presipitasi M Satria Haruda; Ahmad Fadli; 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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Hydroxyapatite is a mineral compound with chemical formula CA10 (PO4)6(OH)2 which can be used as implants in the human body. Hydroxyapatite can be synthesized from bovine bones using precipitation method. The aim of this study was to know the effect of pH and time of reaction to the characterization of hydroxyapatite made from using bovine bone. Bovine bones calcined at 1000 ℃ to produce calcium oxide (CaO). Then CaO is dissolved into distilled water and slowly mixed with phosphoric acid (H3PO4) and then set the pH 5, 7, 9, 11, and time of reaction 20, 40, 60, 80, 100, and 120 minutes. Then allowed to stand 24 hours and the precipitate is filtered. The results calcined sieve then characterized by XRD, FTIR and SEM. The effect of pH and time of reaction in the synthesis of hydroxyapatite seen in the XRD analysis showed the higher peaks than the other at the same peaks and the FTIR analysis looks at the increasingly sharp steepness wavelength at PO43- functional groups and OH- when the pH is higher. Based on the results , the hydroxyapatite at pH 11 has a purity of 99.7 % and crystanility of 98.33 % , while the pH 5 has a purity of 97.5 % and crystanility of96.00 %. Time of reaction at 100 minutes showed a purity of 99.8 % and crystanility of 92.82 % and purity of 92.9 % and crystanility of 84.99 % for 20 minutes. .Keywords: hydroxyapatite, pH, precipitation, time of reaction
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