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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 Sagu
Silvia Reni Yenti
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Agriculture, Biological Sciences & Forestry 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 Physics

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Adsorbs! Fenol Dengan Adsorben Kitin Yenti, Silvia Reni
Jurnal Pilar Sains Vol 11, No 01 (2011)
Publisher : Jurnal Pilar Sains

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Phenol into the waters have an impact on environmental pollution when the phenol content of that exceeds the predetermined threshold is 0.001mg/L.Chitin derived from shrimp shell wastes can be utilized as adsorben adsorption of phenol with adsorbtioni.this search process aims to determine the absorption maximum chitin by variations in temperature and concentration of phenol .the treatment shrimp shell waste to obtain chitin includes washing ,dryng,grinding,soaking with HCL 2N to remove minerals (demineralization) and soaking with NaOH 2N TO remove proteins (deproteinasi).then performed the absorption process with adsorption time 60 minutes,stiring speed 150 rpm,temperature variation 30;40;50⁰C and concentration of phenol 50,75,100,125ppm.from searched result is obtained of the absorbed phenol on chitin 5gr amounted to 4,479with concentration of phenol 100ppm at 30⁰C.
Penyerapan Zat Warna Metilen Biru Dengan Memanfaatkan Bagas Tebu Yenti, Silvia Reni
Jurnal Pilar Sains Vol 11, No 01 (2011)
Publisher : Jurnal Pilar Sains

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Bagas tebu dapat dimanfaatkan sebagai adosrben utnuk kepentingan tertentu seperti pengolahan untuk penyerapan pada zat warna seperti metilen biru yang mengandung warna biru, dalam penelitian ini bertujuan untuk mengetahui daya serap bagas tebu tersebut. Dalam pembuatan arang bagas tebu yaitu diarangkan dan dihancurkan setelah itu diayak dengan pengayak ukuran 100 mesh, selanjutnya dilakukan proses penyerapan dengan menggunakan zat warna metilen biru dengan variasi berat yaitu, 0,8, 1,6, 2,4, dan 3,2 gram. Dan variasi waktu 30, 60,90 dan 120 menit dengan perbandingan konsentrasi 50 ppm dan 100 ppm. Didapat hasil daya serap pada menit terakhir untuk konsentrasi 100 ppm pada waktu 120 menit dengan berat adsorben 3,2 gram yaitu 98,87 dan daya serap maksimum untuk konsentrasi 50 ppm pada menit 90 dengan berat adsorben 3,2 gram yaitu 97.47%. Dari hasil penelitian menunjukkan bahwa didapatnya daya serap maksimum arang bagas tebu yaitu konsentrasi 50 ppm pada berat adsorben dan 3,2 gram dengan efisiensi penyerapan 97,47%.
Pemurnian Bioetanol Hasil Fermentasi Nira Nipah Menggunakan Proses Destilasi-Adsorpsi Pada Variasi Rasio Adsorben Dengan Modifikasi Yuliana, Yuliana; Chairul, Chairul; Yenti, Silvia Reni
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Bioethanol is used in the fuel mixture to the vehicle must be anhydrous so as not to cause corrosion in the engine, so that bioethanol should have a grade of 99% -100%. One of the main problems in the process of making bioetanol is the process of separation water with ethanol to get ethanol dry ( 99,95 % ). Purification of ethanol is usually done by distillation, but the distillation process has the disadvantage because of the azeotrope so hard to get dry ethanol. One method that is cheaper and easier is by distillation-adsorption using porous media. This study aims to obtain bioethanol from nypa using distillation purification process-adsorption using bentonite pellets, to obtain comparative data on the adsorption ability of bentonite pellets and data additions optimum starch and characterize the physical properties of bioethanol and qualitative test with GC. This research was conducted in several stages of the preparation of bioethanol, activation of bentonite, bioethanol purification by distillation-adsorption process, and product analysis. Variations of ratio adsorbent: bioethanol 1: 2, 1: 3, and 1: 4, and variations of the addition of starch varied namely 30, 35, 40 and 45% of the weight of bentonite, process temperature 78 °C, the activation of bentonite in physics. From the research results, obtained by the process of distillation-optimum adsorption with activated bentonite adsorbent physics with the addition of 35% starch with a ratio of 1: 2. Ethanol levels increased from 96% to 99.8% volume.Keywords: Bentonite, bioethanol, distilation- adsorption process, nypa, starch
Kesetimbangan Adsorpsi Logam Cu Menggunakan Karbon Aktif Dari Ampas Tebu Sebagai Adsorben Astrandana, Yudi; Chairul, Chairul; Yenti, Silvia Reni
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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Bagasse is a by product of the extraction process (pressing) liquid sugar. One of the efforts to control the bagasse is processed into activated carbon. This research aims to study activated carbon manufacturing process of bagasse, study the effect of Cu concentration and temperature of Cu solution on activated carbon from bagasse as and determine of equilibrium models that used at Cu metal adsorption using activated carbon from bagasse. Processing bagasse into activated carbon carbonization process is carried out at a temperature of 320 ° C for 2 hours. After that is activated using KOH with comparison of activated carbon to KOH 1:3. As much as 1.5 grams of activated carbon was added to the beaker containing the solution of Cu at various concentration (20 ppm, 30 ppm and 40 ppm), the reaction temperature (40 ° C, 50 ° C and 60 ° C) at a volume of 500 ml solutions. The results showed that activated carbon adsorption for is 97.1%, followed equilibrium models Freundlich isotherm models.Keywords: Adsorption, Cu Metal, Carbonization, Activated Carbon
Kesetimbangan Adsorpsi Logam Fe (II) Menggunakan Karbon Aktif Dari Ampas Tebu Sebagai Adsorben Yuanita, Mira; Yenti, Silvia Reni; Chairul, Chairul
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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Bagasse is a by-product from pressing liquid sugar. One of the efforts to control the bagasse is processed into activated carbon. This study aims to activated carbon from bagasse, study the effect of Fe (II) concentration on activated carbon from bagasse and adsorption equilibrium model. Processing bagasse into actived carbon carbonization process is carriedout at a temperature of 320 °C for 2 (two) hours. After that activated with KOH ratio 3:1. 2 grams of activated carbon was added to the beaker containing the solution of Fe (II) atvarious concentration (20; 30; and 40 ppm), and the reaction temperature (40; 50; and 60 °C). The results showed that activated carbon adsorption for 20 ppm and 40 °C is 90,80%,followed equilibrium Freundlich and Langmuir isotherm models (with regretion 0,986 and0,985) and the heat of reaction of 2,24 kcal/mol°K.Keywords : adsorption, ion Fe (II), adsorption isotherm, activated carbon
Pengaruh Penambahan Trikalsium Fosfat Dan Jenis Starch Pada Pembuatan Biokeramik Berpori Menggunakan Metode Starch Consolidation Yuliestri, Erika Rezi; Yenti, Silvia Reni
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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Tricalcium phosphate (TCP) is one of the compound of hard tissues the human body that can be applied in the medical. One of technique for making porous tricalcium phosphate is starch consolidation method. The objective of this research is to study effect of adding tricalcium phosphate and starch type of porous tricalcium phosphate. This research was conducted in mixing tricalcium phosphate powder as much as 6 ; 7 ; and 8 gram with 3 gram of sago starch or corn starch, as well as 10 ml aquadest. The slurry was stirred for 1 hour and dried in oven at oven 80˚C for 24 hours and 120˚C for 8 hours. The dryed green bodies were burnt at a temperature of 600˚C and sintered at a temperature of 1300˚C. Porous tricalcium phospate prepared using corn starch has a higher compressive strength than the porous tricalcium phospate using sago starch. The addition of tricalcium phosphate result in smaller porosity and density as well as greater shrinkage and also higher compressive strength. Sintered tricalcium phosphate bodies shows that the shrinkage in the range of 47,66–62,31%, porosity 23,81-32,07%, density 0,67-0,76 gr/cm3compressive strength 2,87-3,71 MPa.Keywords: Compressive strength; Porosity; Starch; Tricalcium phosphate
Produksi Bioetanol Dari Nira Nipah Skala 50 Liter Dengan Penambahan Tween 80 Dan Ergosterol Pada Proses Fermentasi Menggunakan Saccharomyces Cerevisiae Widodo, Prio; Chairul, Chairul; Yenti, Silvia Reni
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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Currently, supply of ethanol was produced globally from sugar and starch. Sugar crops contributed about 61% of total ethanol production while 39% from starch. Nypa sap is one of potential material to be processed to bioethanol. The availability of nypa land is sufficient widely in Indonesia as well as a fairly high sugar content (15-20%) make nypa sap has the potential to be processed into bioethanol as a renewable energy. The aimed of this study was to observe the effect of fermentation time nypa sap with the addition of tween 80 and ergorsterol to bioethanol yield on a scale of 50 liters. Fermentation was carried out in a 70 liter fermenter with a variation of fermentation time about 24, 36, 48, 60, 72, 84, 96 and 108 hours, variations of tween 80 addition about 250 ml and ergosterol as much as 25 grams and without the addition of tween 80 and ergosterol. Effect of addition ergosterol can increase stress tolerance of yeast to osmotic pressure and high bioethanol tolerance in yeast cells. While the effect ofthe addition tween 80 can increase the absorption of ergosterol in plasma membrane and enzymatic accessibility and increasing the level of consumption of glucose in the final stages of fermentation. Fermentation of nypa sap produced the best conditions on the addition of 250 ml tween 80 and ergosterol 25 grams on the fermentation time 96 hours with bioethanol concentration about 16.22% (v /v) or 127.99 mg/mlKeywords: Bioethanol, Ergosterol, Nypa Sap, Saccharomyces Cerevisiae, Tween 80
Sintesis Hidroksiapatit Dari Limbah Tulang Sapi Menggunakan Metode Presipitasi Dengan Variasi Rasio Ca/P Dan Konsentrasi H3PO4 Haris, Al; Fadli, Ahmad; Yenti, Silvia Reni
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Hydroxyapatite is a compound of calcium phosphate ceramics and also the main inorganic components in bones and teeth of animals and humans. Hydroxyapatite was synthesized from bovine bones using precipitation method. The purpose of this study is to determine the effect of the ratio of Ca / P and the concentration of H3PO4 to the characterization of hydroxyapatite made from bovine bones as raw materials using precipitation method. Bovine bones were calcined at 1000℃ to produce calcium oxide (CaO). Then CaO was dissolved into distilled water and slowly mixed with phosphoric acid (H3PO4) at a ratio of Ca/P 0.67; 1.67; 2.67 and the concentration of H3PO4 0.6 M, 0.8 M, 1.2 M and 2.4 M. Then the mixture going through aging process for 24 hours and then the precipitate was filtered. The residue was calcined and characterized by XRD, FTIR, and SEM-EDX. Hydroxyapatite with a variation of Ca/P ratio, the difference between the initial and final ratio of Ca/P tends to decrease with an increase of the initial ratio of Ca/P. Hydroxyapatite with a variation of H3PO4 concentration, the final ratio of Ca/P tends to decrease with an increase of H3PO4 concentration.Keywords: hydroxyapatite, precipitation, ratio, concentration.
Pembuatan Karbon Aktif Dari Kulit Durian Sebagai Adsorbent Logam Fe Febriansyah, Beni; Chairul, Chairul; Yenti, Silvia Reni
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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Durian peel is known as the waste that can pollute the environment. One effort to improve the economic value of the durian skin can be done with the process into activated carbon. This study aims to obtain optimum conditions for the use of activators of Kaliaum Hidroksida on the quality of activated carbon and activated carbon absorption of Fe metal. Activated carbon is made via two processes, namely the process of carbonization and activation at 320oC temperature with a solution of Kalium Hidroksida by varying the massa aktif carbon1, 1.5, 2, 2.5, dan 3 gr and adsorb time30, 60, 90, dan 120 menit. To determine the quality of activated carbon, activated carbon characteristics tested, such as moisture content, ash content, and the absorption of iodine. The results showed that the characteristics of activated charcoal SNI 06-3730-1995 meets the standards the water content of 14.12%, 5.46% ash content and absorption of I2 solution of 580.27 mg / g in adsorbing metals Fe. Application of Fe metal adsorption by activated carbon from durian skin with 3 grams of carbon mass variation and contact time of 90 minutes where the adsorption efficiency is 96.75%.Keywords: activated carbon, durian skin, potassium hydroxide
Fermentasi Asam Asetat Dari Nira Nipah (Nypa Fruticans) Menggunakan Acetobacter Pasteurianus Dengan Variasi Volume Inokulum Dan Waktu Fermentasi Triani, Leni; Chairul, Chairul; 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

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The main products are nipah sap which isobtained from not fruit bunches with high sugar concentrations so as to provide an opportunity in the utilization of nipah sap to be acetic acid. Acetic acid can be produced naturally from ingredients containing sugar through fermentation using bacteria. The variation of inoculums acetobacter pasteurianus is 10%,13% and 16% and the time of acetic acid fermentation is 1, 3, 5, 7 and 9 days. The results of the analysis using the Nelson-Somogyi reagent revealed that the initial sugar concentration was 162,97 g/L. time of bioethanol fermentation is 24 hours. The maximum concentration of acetic acid obtained was 27,22 g/L with a pH 0f 3,47 and yield 33,09%. This maximum concentration was obtained on 9 days of acetic acid fermentation at 13% of acetobacter pasteurianus inoculums.Keywords : Acetobacter Pasteurianus, acetic acid, fermentation, inokulum, nipah sap.
Co-Authors Ade Sri Umaiyah Adli Satria Sandika Affandry Taufik Ahmad Fadli Ahmad Fadli Ajma Nouri Arianty Septia Ningsih Astrandana, Yudi Chairul Chairul Chairul Chairul Dedi Meier Silaban Drastinawati Drastinawati Drastinawati Drastinawati, Drastinawati Dwi Yuni Ernawati Edy Saputra Erika Rezi Yuliestri, Erika Rezi Fajril Akbar Febriansyah, Beni Fernando Susilo Frederika Mawarni Adilasari Nduru Frimacia, Tifanny Gery Azhari Putera Haris, Al Idral Amri Lanie Faradina M Satria Haruda Mimin lestari Nainggolan, Ira Tri Asi Br. Nisa, Aidina Fahrun Nur Irfana Mardiyah Nuvicha Rizqi Yuniva Zikra 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 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 Yuanita, Mira Yuliana Yuliana Zuchra Helwani Zultiniar, Zultiniar