Article Per Year (5 Year)
p-Index From 2019 - 2024
1.745
P-Index
This Author published in this journals
All Journal Jurnal Teknologi Industri Pertanian SAINS DAN MATEMATIKA JURNAL KIMIA SAINS DAN APLIKASI MEDIA BINA ILMIAH Indonesian Journal of Chemistry Greensphere: Journal of Environmental Chemistry Analit: Analytical and Environmental Chemistry
Linda Suyati
Department Of Chemistry, Faculty Of Science And Mathematics, Diponegoro University, Jl. Prof. H. Soedarto, S.H., Tembalang Semarang 50275, Indonesia
Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Industrial & Manufacturing Engineering Mathematics Social Sciences

Published : 19 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 19 Documents
Search

 1   2 
Effect of Series Circuit on the Lactose Bioelectricity of a Microbial Fuel Cell System using Lactobacillus bulgaricus Hayati, Dini Noor; Nuryanto, Rahmad; Suyati, Linda
JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 3 Year 2015
Publisher : JURNAL SAINS DAN MATEMATIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (398.8 KB)

Abstract

The need for alternative energy, especially electricity at this time is increasing. The decreasing amount of fuel that cannot be updated, encouraging scientists to conduct researches in finding alternative energy sources which are environmentally friendly, one of the alternative energy is the Microbial Fuel Cell (MFC). The research on the effects of a series circuit on the production of lactose bioelectricity microbial fuel cell system using Lactobacillus bulgaricus has been conducted. This study aim was to assess the effect on the production series circuit lactose bioelectricity MFC system using microbes Lactobacillus bulgaricus. Stages of research included a microorganism preparation of Lactobacillus bulgaricus, and measuring the potential difference in a single, series 1 and series 2 circuits in the MFC system. The potential difference on the measurement of a single, series 1 and series 2 on the substrate lactose were 45 mV / 100mL; 57 mV / 100mL; 58 mV / 100mL respectively where the power were 105.75x10-6 mW; 136x10-6 mW; 139.2x10-6 mW. These results suggested that series circuit was able to increase the potential difference and power on the substrate lactose and tofu whey the MFC system according to Ohm’s law. Keywords: Lactose, microbial fuel cell, Lactobacillus bulgaricus, a series circuit
The Bioelectricity of Tofu Whey in Microbial Fuel Cell System with Lactobacillus bulgaricus Inayati, Nor Sri; Aminin, Agustina L. N.; Suyati, Linda
JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 1 Year 2015
Publisher : JURNAL SAINS DAN MATEMATIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (478.692 KB)

Abstract

Tofu whey is a byproduct of the manufacturing process tofu which containing the remains of protein, fat, carbohydrates and water-soluble substances that do not agglomerate. This study aim was to assess the potential of tofu whey as a substrate in the MFC system and to evaluate the effect of agitation speed to the potential difference generated in the MFC system using Lactobacillus bulgaricus. The potential difference in the variation of the substrate was measured against tofu whey, glucose and lactose. The potential difference with agitation speed variation was carried out at speed of 30, 60, 90, 125 and 250 rpm. The highest potential differences in the substrate variation showed relatively similar results, however they were achieved in different times, which the speed was dependent on the complexity of the substrate molecular structure. While the agitation of 90 rpm gave the highest potential difference. These results indicates that tofu whey potential to be used as a MFC substrate.
Studi Pendahuluan Pemanfaatan Whey Tahu sebagai Substrat dan Efek Luas Permukaan Elektroda dalam Sistem Microbial Fuel Cell Sinaga, David Hamonangan; Suyati, Linda; Aminin, Agustina L. N.
JURNAL SAINS DAN MATEMATIKA Volume 22 Issue 2 Year 2014
Publisher : JURNAL SAINS DAN MATEMATIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4726.349 KB)

Abstract

Studi ini bertujuan mengkaji potensi whey tahu sebagai substrat menggunakan Saccharomyces cerevisiae dan mempelajari pengaruh luas permukaan elektroda dalam menghasilkan beda potensial pada sistem MFC. Tahapan penelitian meliputi konstruksi reaktor MFC, pengukuran beda potensial pada variasi substrat yaitu membandingkan beda potensial yang dapat dihasilkan oleh substrat whey tahu dengan substrat glukosa, dan pengukuran beda potensial pada variasi luas permukaan elektroda dengan masing-masing luas permukaan elektroda grafit sebesar 13,29 cm2, 26,58 cm2, 39,87 cm2, dan 53,16 cm2. Hasil penelitian menunjukkan bahwa whey tahu memiliki potensi dengan dihasilkannya beda potensial maksimum 11,73 mV/100 ml substrat dalam sistem MFC menggunakan S. cerevisiae. Hasil studi juga menunjukkan bahwa semakin besar luas permukaan elektroda, semakin besar pula beda potensial yang dihasilkan. Hal ini dibuktikan dengan luas elektroda grafit 53,16 cm2 menghasilkan beda potensial 40,67 mV/100 mL substrat whey tahu dan 300 mV/100 mL substrat glukosa.   Kata kunci: Whey tahu, Microbial fuel cell, Saccharomyces cerevisiae, dual-chamber MFC    The preliminary research about the utilization of soy whey as a substrate and the effect of electrode surface area in microbial fuel cell (MFC) system has been conducted. Laboratory-scale experiment of MFC was carried out in order to determine the ability of soy whey to act as substrate using Saccharomyces cerevisiae and the influence of electrode surface area to generate a potential difference in MFC system. The study includes the MFC reactor design, measuring a potential difference at variation of substrate (soy whey and glucose), and evaluate a potential difference at a variation of graphite electrode surface area. The results show that soy whey has an ability to be applied as a substrate in the MFC system using S. cerevisiae with potential difference 11,73 mV/100 ml. The variation of electrode surface area in the MFC system with four graphite electrodes (53.16 cm2) give the best potential difference with 40,67 mV/100 ml of soy whey and 300 mV/100 ml of glucose substrate.   Keywords: Soy whey, Microbial fuel cell, Saccharomyces cerevisiae, dual-chamber MFC
Whey Tahu sebagai Penghasil Biolektrisitas pada Sistem Microbial Fuel Cell dengan Lactobacillus Plantarum Ismawati, Nur; Aminin, Agustina L. N.; Suyati, Linda
JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 2 Year 2015
Publisher : JURNAL SAINS DAN MATEMATIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (414.255 KB)

Abstract

Bioelectricity of soy whey in Microbial Fuel Cell system with Lactobacillus plantarum has been performed. This study aims to determine the capacity of soy whey as a substrate in the MFC system and determine the influence of the speed of agitation against potential difference generated. The potential difference compared to different substrates, namely soy whey, glucose and lactose. Determination of the potential difference in speed variation agitation performed with variations 30, 60, 90, 125 and 250 rpm. The potential difference at the maximum voltage variation of the substrate obtained by soy whey by 33.3 mV / 100 mL at the 15th hour, whereas glucose and lactose reaches the maximum potential difference at the 12th hour with a relatively similar value. Agitation speed that generates the highest potential difference in soy whey substrate was obtained at 90 rpm with maximum potential difference of 63.1 mV / 100mL at the 14th hour.
Pengaruh Konsentrasi Kalium Asetat dan Natrium Asetat terhadap Konduktivitas Elektrolit Padat KMn(2-x)Mgx O2 dan NaMn(2-x)MgxO2 Nuryanto, Rahmad; Suyati, Linda; Harjono, Cipto; Anggrayni, Rahmaniar
JURNAL SAINS DAN MATEMATIKA Volume 21 Issue 2 Year 2013
Publisher : JURNAL SAINS DAN MATEMATIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2333.65 KB)

Abstract

Pembuatan elektrolit padat KMn(2-x)Mgx O2 dan NaMn(2-x)MgxO2 dilakukan dengan metode sol-gel dengan variasi konsentrasi Kalium Asetat dan Natrium Asetat. Kalium Asetat dan Natrium Asetat dengan konsentrasi 0,1 sampai 0,5 masing-masing dicampur dengan larutan Mangan Asetat, Magesium asetat dan asam sitrat. Larutan-larutan tersebut diaduk selama 2 jam, kemudian dievaporasi dengan temperatur  80°C selama 2 jam, selanjutnya dilakukan drying dengan temperatur 175°C dan kalsinasi dengan temperatur 650°C. Hasilnya berupa padatan diuji konduktivitas dan gugusn fungsinya dengan FTIR. Hasil Penelitian menunjukkan bahwa konduktivitas tertinggi dari elektrolit padat KMn(2-x)Mgx O2 dan NaMn(2-x)MgxO2 diperoleh pada konsentrasi Kalium Asetat 0,1 M dan Natrium asetat 0,1 M. Hubungan antarakonsentrasi(c) dengan konduktivitas (k) untuk KMn(2-x)Mgx O2 adalah c = -64,05 +42,3 dan untuk NaMn(2-x)MgxO2 c = -269,45k +222,85.   Keywords: Elektrolit padat, Sol-gel, KMn(2-x)Mgx O2 , NaMn(2-x)MgxO2, konduktivitas
Pembuatan dan Karakterisasi Katalis Nikel/Zeolit pada Pirolisis Tir Batubara Suyati, Linda
Jurnal Kimia Sains dan Aplikasi Vol 8, No 2 (2005): Volume 8 Issue 2 Year 2005
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (366.71 KB) | DOI: 10.14710/jksa.8.2.39-42

Abstract

Telah dilakukan penelitian untuk pirolisis ter batubara menggunakan katalis Ni-Zeolit. Preparasi katalis dengan impregnasi larutan [Ni(NH3)]2+ 0,15M melalui pengeringan, kalsinasi, oksidasi dan reduksi. Karakterisasi keasaman asam katalisdengan metode gravimetri, adsorbsi gas digunakan untuk mengukur luas permukaan, volume pori dan jejari rerata pori. Kandungan nikel diukur dengan AAS. Karakterisasi katalis dianalisis dengan Gas Sorption Analyser. Hasil penelitian menunjukkan imopregnasi nikel-zeolit sebanyak 86,40%, keasaman padadatan meningkat sebesar 30,19%, Luas permukaan dan volume pori masing-masing meningkat sebesar 42,32% dan 41,29%, sedangkan jejari pori menurun sebesar 4,29%. Konstanta BET terbesar pada Ni/Z sebelum direaksikan sebesar 424,55.
PEMANFAATAN KATALIS SILIKA ALUMINA DARI BAGASSE PADA PEMBUATAN BIODIESEL DARI MINYAK GORENG SISA PAKAI Sriatun, Taslimah dan Linda Suyati TIP
Jurnal Teknologi Industri Pertanian Vol. 25 No. 1 (2015): Jurnal Teknologi Industri Pertanian
Publisher : Department of Agroindustrial Technology, Bogor Agricultural University

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

Abstract

It was synthesized biodiesel from the used cooking oil using silica alumina catalyst. The aim of this research was to establish the catalytic performance in the form of silica alumina. The silica in sugarcane baggase was extracted by 6 M sodium hydroxide until sodium silicate was obtained. Synthesis of silica alumina catalyst was conducted by reaching sodium silicate with sodium aluminate, whereas the ratio was 1:1 (v/v), then the mixture was hydrothermaly heated at 100oC for 3 days. Catalytic ability was tested on transesterification reaction of used cooking oil and methanol. This catalytic test was to measure the performance of 1% silica alumina in converting used cooking oil into biodiesel. The variables were examined including ratios of methanol:used cooking oil (1:3, 1:6 and 6:1) and contact times (60 and 120 minutes). Catalyst characteristics were determined by XRD, FTIR, SEM-EDX and surface analyzer, meanwhile biodiesel as the product of transesterification was determined by GC-MS. The result showed that the silica alumina catalyst was Na-sodalite that had composition of Na 17.96%, Al 18.97% and Si 17.04%. Na-sodalite had homogenized shapes and sizes which the pore diameter of 4.55 Ao, pore volume of 5.73.10-3cc/g and surface area of 1.457.105cm2/g. The biodiesel obtained at methanol:used cooking oil of 1:3 for 60 minutes was 13.83% consisting of methyl caprylate, methyl caprate, methyl laurate, methyl myristate, methyl palmitate, methyl linoleat and methyl stearate. Whilst at methanol:used cooking oil of 6:1 yielded 85.51% biodiesel with methyl caprate as main component.Keywords:silica alumina, sugar cane bagasse, used cooking oil,biodiesel
PENGARUH VARIASI KONSENTRASI DOPING MANGAN TERHADAP KARAKTERISTIK ELEKTROLIT PADAT NaCo(1-X)MnXO2 DENGAN METODE SOL-GEL Risky Haerul Imam; Rahmad Nuryanto; Khabibi Khabibi; Linda Suyati
MEDIA BINA ILMIAH Vol 15, No 1: Agustus 2020
Publisher : BINA PATRIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33758/mbi.v15i1.792

Abstract

Telah dilakukan penelitian mengenai pengaruh variasi konsentrasi doping mangan terhadap karakteristik elektrolit padat NaCo(1-x)MnxO2 dengan metode sol-gel. Tujuan penelitian ini adalah membuat elektrolit padat NaCo(1-x)MnxO2 dan menentukan pengaruh variasi konsentrasi doping mangan terhadap karakteristik NaCo(1-x)MnxO2 meliputi morfologidan konduktivitas listrik.Karakterisasi hasil sintesis elektrolit padat yang dilakukan meliputi uji konduktivitas menggunakan LCR meter, X-ray Diffraction (XRD) dan Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM-EDS). Hasil penelitian menunjukkan bahwa telah diperoleh elektrolit padat NaCo(1-x)MnxO2 dengan mineral penyusun elektrolit padat terdiri dari NaMnO2, CoO, Na2O dan MnO2. Penambahan variasi doping mangan menghasilkan konduktivitas tertinggi pada konsentrasi 0,22 M sebesar 4,057x10-6 S/cm, dengan formula spinel yang diperoleh adalah NaCo0,61Mn0,39O2.
PRESERVASI PEPAYA (CARICA PAPAYA) DALAM SISTEM TERTUTUP BERSUHU 273,53 K DENGAN PENGUKURAN PERUBAHAN MASSA DAN KADAR VITAMIN C Eki Khaerul Fikri; W H Rahmanto; Linda Suyati; Rahmad Nuryanto
MEDIA BINA ILMIAH Vol 15, No 12: Juli 2021
Publisher : BINA PATRIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33758/mbi.v15i12.1426

Abstract

Telah dilakukan preservasi pepaya (Carica papaya) dalam sistem tertutup bersuhu 273,53 K dengan pengukuran perubahan massa dan kadar vitamin C. Tujuan penelitian ini adalah membuktikan dalam sistem tertutup berlaku (dmpepaya/dt)273,53K = 0 dan (dCaskorbat/dt)273,53K = 0, sedangkan dalam sistem terbuka berlaku (dmpepaya/dt)273,53K ≠ 0dan (dCaskorbat/dt)273,53K ≠ 0. Perubahan massa buah pepaya diperoleh dari pengukuran selama 0-4 minggu pada sistem terbuka maupun tertutup bersuhu 273,53 K dan kadar vitamin C yang didapatkan adalah dengan spektrofotometri UV. Hasil penelitian menunjukkan bahwa sistem tertutup bersuhu 273,53 K (0,380C) tidak terjadi perubahan massa dengan bernilai konstan (dmpepaya/dt)273,53K = 0, sedangkan pada sistem terbuka mengalami perubahan massa dengan bernilai tidak konstan dalam kurun waktu 0-4 minggu (dmpepaya/dt)273,53K ≠ 0. Kadar vitamin C melalui pengukuran spektrofotometri UV preservasi buah pepaya pada sitstem tertutup menunjukkan tidak ada perubahan kadar vitamin C (dCaskorbat/dt)273,53K = 0, sedangkan pada sistem terbuka mengalami perubahan kadar vitamin C selama penyimpanan 0-4 minggu (dCaskorbat/dt)273,53K ≠ 0
SINTESIS KATALIS NI/ZEOLIT DAN APLIKASINYA PADA PIROLISIS LIMBAH SERABUT BATANG SAGU Dwi Prakoso; Rahmad Nuryanto; Taslimah Taslimah; Khabibi Khabibi; Linda Suyati
MEDIA BINA ILMIAH Vol 14, No 10: Mei 2020
Publisher : BINA PATRIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (278.276 KB) | DOI: 10.33758/mbi.v14i10.512

Abstract

Sintesis katalis Ni/Zeolit sebagai katalisator pada proses pirolisis limbah serabut batang sagu telah dilakukan. Katalis disintesis menggunakan zeolit lolos 100 mesh diaktifasi dengan perendaman HF 1% selama 4 jam dilanjutkan dengan perendaman menggunakan HCl 1 M selama 4 jam. Padatan kemudian dicuci dengan akuades untuk menghilangkan sisa Cl-, kemudian dikeringkan pada 120°C selama 24 jam.  Impregnasi 1,2% (b/b) nikel dilakukan dengan menggunakan metode impregnasi basah dengan garam prekursor NiCl2.6H2O. Katalis Ni/zeolit kemudian dikalsinasi dibawah aliran nitrogen pada 400°C selama 4 jam dilanjutkan oksidasi dibawah aliran oksegen dan reduksi dibawah aliran hidrogen dengan temperatur masing-masing 400°C selama 4 jam. Analisis katalis dilakukan dengan menggunakan XRD dan keasaman total dengan adsorpsi NH3. Pirolisis serabut limbah batang sagu dilakukan dengan katalis dan tanpa katalitis pada 400°C, dengan ditampung produk cairnya. Pirolisis secara katalitik dipergunakan katalis 5% (b/b). Produk cair hasil pirolisis selanjutnya dianalisis dengan GC-MS.Hasil karakterisasi dengan XRD menunjukkan bahwa katalis Ni/Zeolit memiliki kandungan mineral mordenit, clinotilolit, laumontit dan faujasit. Ni terimpregnasi terdeteksi dalam bentuk Ni dan NiO. Hasil analisis terhadap produk cair hasil pirolisis dengan katalis dan tanpa katalis diperoleh produk dominan masing-masing berupa metilglioksal dan asam asetat.
Co-Authors Abdul Haris Abdul Haris Adi Darmawan Adi Putra Agustina L.N. Aminin Brigita Maria Listyani Cipto Harjono David Hamonangan Sinaga Dea Ayu Fardhani Didik Setiyo Widodo Didik Setyo Widodo Dini Noor Hayati, Dini Noor Dwi Prakoso Eki Khaerul Fikri Gunawan Gunawan Gunawan Gunawan khabibi Khabibi Nabila Nurdiantika Nor Sri Inayati, Nor Sri Nur Ismawati, Nur Nurmanita Rusmaningsih Rahmad Nuryanto Rahmaniar Anggrayni Retno Ariadi Lusiana Richard Leonardo Sianturi Risky Haerul Imam Sriatun Sriatun Taslimah Taslimah Taslimah Taslimah Umi Dwijayanti W H Rahmanto W.H Rahmanto Wilman Septina Yayuk Astuti