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JURNAL KIMIA SAINS DAN APLIKASI

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Published by Universitas Diponegoro

ISSN : 14108917 EISSN : 25979914 DOI : -

Core Subject : Science, Engineering,

Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering

urnal Kimia Sains dan Aplikasi (p-ISSN: 1410-8917) and e-ISSN: 2597-9914) is published by Department of Chemistry, Diponegoro University. This journal is published four times per year and publishes research, review and short communication in field of Chemistry.

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Articles 796 Documents

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Elektrodekolorisasi Indigo Karmin Menggunakan Alumina dan Karbon Bekas Sriatun Sriatun; Kuwatno Kuwatno; Suhartana Suhartana
Jurnal Kimia Sains dan Aplikasi Vol 10, No 3 (2007): Volume 10 Issue 3 Year 2007
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Dekolorisasi zat warna indigo karmin telah dilakukan dengan metode elektrolisis. Dalam metode ini telah diteliti pengaruh pH dan temperatur terhadap kemampuan dekolorisasi indigo karmin. Adanya elektrokoagulasi/elektroflokulasi disebabkan oleh kemampuan flok Al(OH)3 mengadsorb indigo karmin dan membentuk kompleks Al-indigo karmin. Flok Al(OH)3 dihasilkan oleh elektrolisis larutan dengan menggunakan alumunium bekas sebagai anoda dan karbon sisa baterai sebagai katoda. Elektrolisis dilakukan selama 150 menit dengan tegangan luar 12 Volt. Hasil penelitian ini menunjukkan bahwa kemampuan dekorisasi terhadap indigo karmin oleh flok Al(OH)3 dipengaruhi oleh pH dan temperatur larutan. Kemampuan dekolorisasi minimum pada pH=6 dan akan meningkat pada kondisi basa dan asam. Persentase dekolorisasi maksimum pada temperatur ruang adalah 51,95% pada pH=14. Persentase dekolorisasi optimum adalah 98,33% pada temperatur 70oC pada pH=10.Kata kunci : elektrodekolorisasi, indigo karmin, alumunium

Decolorization of Remazol Black B Solution by PbO2 Modified Fenton Method in a Scaled Up Reactor Muhamad Abduh Hasibuan; Didik Setiyo Widodo; Retno Ariadi Lusiana
Jurnal Kimia Sains dan Aplikasi Vol 21, No 2 (2018): Volume 21 Issue 2 Year 2018
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Study on decolourization of remazol black B (RBB) solution has been performed in a scale up reactor. As an artificial waste, the dye sample that contains azo groups is difficult to decompose under ordinary environmental conditions so it requires further treatment before discharging to open aquatic system. Many efforts have been reported and further developed toward other azo dyes. One of an outstanding approach is Fenton method. This study modified the method with PbO2 rather than Fe2+. In this modification, the dyestuff was degraded by radical •OH resulting from reaction between H2O2 and Pb2+ ion generated from PbO2. In Preliminary works, decolourization was performed and optimized in lab-scaled. Analysis were conducted and the best condition was applied to decolorize the sample in a scale-up size. Characteristics of the reactor was also determined. Results showed that at optimum condition, 100 mL of 50 ppm remazol black B was decolorized up to 98.82 % within 15 minutes. On scale up to 1 L-sized reactor, within the time highest percentages of remazol black B decolourization was reached 82.02 % by addition of 10 % H2O2 and COD decrease to 98.96 %. In the 1 L reactor, RBB sample with concentration of 50 ppm, PbO2 1 gram and H2O2 10 % obey the proposed decolourization equation of D = -0,0011x2 + 0.5705x – 0.6788 with x = volume peroxide (in mL), D = percent of decolourization.

Efek Natrium Hidroksida terhadap Rendemen Magnesium Hidroksida pada Elektrolisis Sistem C|NaOH || MgSO4,NaCl |C Monita Rekasih; Linda Suyati; Wasino Hadi Rahmanto
Jurnal Kimia Sains dan Aplikasi Vol 13, No 2 (2010): Volume 13 Issue 2 Year 2010
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Penelitian tentang elektrolisis model air laut dengan sistem C│NaOH║MgSO4,NaCl│C telah dilakukan.penelitian bertujuan untuk membuktikan bahwa Mg(OH)2 dapat terbentuk pada elektrolisis system C│NaOH║MgSO4,NaCl│C dan menentukan pengaruh NaOHpada pembentukan Mg(OH)2. Proses elektrolisis dilakukan dengan sistem 2-kompartemen untuk menentukan kondisi konversi elektrolitik ion Mg2+ menjadi Mg(OH)2. Metode yang digunakan adalah pemisahan magnesium berdasarkan pengendapan selektif melalui proses elektrolisis yang dilakukan selama 4 jam. Hasil elektrolisis kemudian dianalisis menggunakan spektroskopi FTIR dan AAS. Spektra IR membuktikan bahwa endapan hasil elektrolisis merupakan Mg(OH)2 yang ditunjukkan pada bilangan gelombang 3695,61 cm–1 dan 3425,58 cm–1 yang menginformasikan ada gugus –OH dan bilangan gelombang 871,82 cm–1 yang mengindikasikan ada ikatan Mg-O. Rendemen Mg(OH)2 hasil elektrolisis tertinggi sebesar 99,41% pada penggunaan NaOH 0,1M. Hasil analisis AAS menunjukkan bahwa kadar Mg dalam endapan Mg(OH)2 sebanyak 55,12%.

Pengaruh Variasi Chelating Agent terhadap Karakteristik Produk pada Sintesis Elektrolit Padat NaMn2-xMgxO4 dengan Metode Sol-Gel Sefthymaria Sefthymaria; Rahmad Nuryanto; Taslimah Taslimah
Jurnal Kimia Sains dan Aplikasi Vol 18, No 3 (2015): Volume 18 Issue 3 Year 2015
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Telah dilakukan penelitian mengenai pengaruh variasi chelating agent pada sintesis elektrolit padat NaMn2-xMgxO4 dengan metode sol-gel. Penelitian ini bertujuan untuk mengetahui pengaruh variasi asam (asam askorbat, asam sitrat dan asam maleat) sebagai chelating agent terhadap kristalinitas, ukuran kristal, konduktivitas dan morfologi dari material yang dihasilkan. Tahapan penelitian ini meliputi pencampuran reagen, evaporasi, pengeringan dan kalsinasi. Produk kalsinasi dikarakterisasi menggunakan XRD, multimeter dan SEM-EDS. Mineral penyusun elektrolit padat meliputi NaMnO2, MnO2 MgO dan Na2O. Kristalinitas terendah dan konduktivitas tertinggi dimiliki oleh produk yang menggunakan asam askorbat sebagai chelating agent, dengan nilai konduktivitas 1,91 x 10-4 Scm-1; ukuran kristal 26,09 nm dan ukuran aglomerasi 0,66 μm. Elektrolit padat NaMn2-xMgxO4 yang dihasilkan untuk variasi chelating agent asam askorbat memiliki formula spinel NaMn1,32Mg0,68O4.

Kemampuan Quanin pada Ekstraksi Kation Fe2+ dan Senyawa Kompleks [Fe(CN)6]4- pada Fasa Air dan Kloroform Suhartana Suhartana
Jurnal Kimia Sains dan Aplikasi Vol 10, No 2 (2007): Volume 10 Issue 2 Year 2007
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Besi adalah merupakan kation yang mudah terlarut di dalam air. Seringkali keberadaannya pada industri electroplating kurang dikehendaki. Salah satu cara untuk mengurangi (dekonsentrasi) kation besi dilakukan dengan membuat senyawa kompleksnya, yang dapat terlarut dalam pelarut organik. Dengan ligan quanin kation Fe2+ dapat dipungut kembali sebesar 98,56 %, sementara senyawa kompleks [Fe(CN)6]4- dapat dipungut 62,24 %.

Conversion of Wood Waste to be a Source of Alternative Liquid Fuel Using Low Temperature Pyrolysis Method Gesyth Mutiara Hikhmah Al Ichsan; Khoirina Dwi Nugrahaningtiyas; Dian Maruto Widjonarko; Fitria Rahmawati; Witri Wahyu Lestari
Jurnal Kimia Sains dan Aplikasi Vol 22, No 1 (2019): volume 22 Issue 1 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Conversion of wood waste into bio-oil with low temperature pyrolysis method has been successfully carried out using tubular transport reactors. Pyrolysis carried out at temperatures of 250-300°C without using N2 gas. Bio-oil purified by a fractionation distillation method to remove water and light fraction compounds. The materials obtained from different types of wood waste, namely: Randu wood (Ceiba pentandra), Sengon wood (Paraserianthes falcataria), Coconut wood (Cocos nucifera), Bangkirei wood (Shorea laevis Ridl), Kruing wood (Dipterocarpus) and Meranti wood (Shorea leprosula). Bio-oil products are analyzed for their properties and characteristics, namely the nature of density, acidity, high heat value (HHV), and elements contained in bio-oil such as carbon, nitrogen and sulfur content based on SNI procedures, while bio-oil chemical compositions are investigated using Gas Chromatography Mass Spectroscopy (GC-MS). The maximum yield of bio-oil products occurs at 300°C by 40%. Bio-oil purification by fractional distillation method can produce purity of 16-31% wt. The characterization results of the chemical content of bio-oil showed that bio-oil of methyl formate, 2,6-dimetoxy phenol, 1,2,3 trimethoxy benzene, levoglucosan, 2,4-hexadienedioic acid and 1,2- benzenediol.

Pemurnian NaCl dengan Penambahan Bahan Pengikat Impurities pada Garam Krosok dan Garam Kuwu dengan Rekristalisasi Secara Penguapan dan Penambahan Gas HCl Dewi Anggia Murni; Gunawan Gunawan; Rum Hastuti
Jurnal Kimia Sains dan Aplikasi Vol 14, No 1 (2011): Volume 14 issue 1 Year 2011
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Garam meja adalah aditif pokok yang digunakan untuk memenuhi makanan sehari-hari dan sebagai bahan baku industri. Pemisahan garam dari kotoran masih menjadi masalah terutama ion pengotor Ca2+ dan Mg2+. Tujuan dari penelitian ini adalah untuk membandingkan metode penguapan dan pengendapan dengan penambahan gas HCl pada pemurnian garam dan untuk mengetahui pengaruh penambahan amonium karbonat (NH4)2CO3 dalam penghilangan ion Ca2+ dan Mg2+ dalam pemurnian garam. Metode terbaik ditentukan dengan membandingkan hasil yang diperoleh antara metode penguapan garam dan metode pengendapan dengan penambahan gas HCl, yang sebelumnya telah direkristalisasi dengan menambahkan pengikat pengotor seperti CaO, Ba(OH)2 dan (NH4)2CO3. Penghilangan Ca2+ dan Mg2+ dilakukan dengan menambahkan (NH4)2CO3 dengan variasi volume 0,8; 1,6; 2,4; 3,2 dan 4 mL. Hasil penelitian menunjukkan bahwa pemurnian dengan metode penambahan gas HCl menghasilkan kadar NaCl yang lebih tinggi yaitu 99,52% (garam krosok) dan 99,25% (garam Bledug kuwu) sedangkan metode penguapan menghasilkan 98,53% (garam krosok) dan 98,70% (Bledug kuwu garam). Konsentrasi pengotor Ca2+ dan Mg2+ terendah diperoleh pada penambahan (NH4)2CO3 yaitu 3,2 ml 8,6 ppm (garam krosok) dan 9,04 ppm Ca2+ (garam Bledug kuwu). Konsentrasi Mg2+ adalah 5,6 ppm (garam krosok) dan 7,36 ppm (garam Bledug kuwu).

Identifikasi Kandungan Kimia dan Uji Aktivitas Antimikroba Kulit Durian (Durio zibethinus Murr.) Eka Vany Anggraeni; Khairul Anam
Jurnal Kimia Sains dan Aplikasi Vol 19, No 3 (2016): Volume 19 Issue 3 Year 2016
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Ekstraksi, fraksinasi, uji aktivitas antimikroba dengan metode difusi agar serta identifikasi kandungan kimia dari fraksi aktif dari kulit durian (Durio zibethinus Murr.) telah dilakukan. Dari maserasi dari kulit durian (Durio zibethinus Murr) yang dilakukan menggunakan pelarut etanol 96%, diperoleh ekstrak etanol kulit durian. Kemudian dilanjutkan dengan fraksinasi dengan pelarut n-heksana, kloroform, etil asetat, dan metanol sehingga diperoleh masing-masing fraksi n-heksana, kloroform, etil asetat, dan metanol. Dari ekstrak dan fraksi kulit durian, kemudian dilakukan uji aktivitas antimikroba, hingga diperoleh fraksi teraktif adalah fraksi etil asetat. Identifikasi kandungan kimia dalam fraksi aktif etil asetat kulit durian dilakukan dengan metode Kromatografi Lapis Tipis preparatif. Sedangkan uji kemurnian isolat dianalisis menggunakan metode Kromatografi Lapis Tipis dan didapatkan isolat E.2.2.2. Isolat berbentuk serbuk putih dan karakterisasi menggunakan spektrofotometer UV-Vis menunjukkan panjang gelombang maksimum 205 nm, 236 nm, dan 270-300 nm. Analisis dengan spektofotometer FTIR menunjukkan adanya gugus O-H, =C-H aromatik, C=C aromatik, substitusi aromatik, C=O asam karboksilat, C=C alkena dan C-O eter. Sedangkan Analisis Kromatografi Lapis Tipis dengan pembanding senyawa standar asam fenolat, diduga bahwa isolat E.2.2.2 adalah asam ferulat.

Pengaruh p-Klorofenol terhadap Efektivitas Fotoreduksi Ion Hg(II) yang Dikatalisis TiO2 Devina Ingrid Anggraini; Endang Tri Wahyuni; Mudasir Mudasir
Jurnal Kimia Sains dan Aplikasi Vol 11, No 2 (2008): Volume 11 Issue 2 Year 2008
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

The objective is to develop photoreduction method catalyzed by TiO2 for the decreasing Hg(II) concentration. Photocatalytic reduction was carried out in a closed reactor equipped with UV lamp, by irradiating and stirring a mixture of Hg(II) solution and TiO2 photocatalyst powder for a certain period of time. The amount of reduced Hg(II) by photoreduction was calculated by substracting initial Hg(II) concentration with unreduced one, which was determined using cold vapor atomic absorption spectrophotometry method. The result of the research indicated that the use of TiO2 photocatalyst has increased the effectiveness of Hg(II) photoreduction. In the photocatalysis process TiO2 exposured by photon energy could resulted in •OH radicals and electrons that can recombined in the same time. The presence of p-chlorophenol in the solution mixture increased the photoreduction effectiveness probably due to its capability in capturing •OH radicals.TiO2 decreases in its crystalinity up to 15.54 % after process.Keywords: photoreduction, Hg(II), TiO2, p-chlorophenol

Preparation and Validation of Fe2O3 Modified Carbon Paste Electrode for Measurement of Dopamine by Voltammetry Method Irdhawati Irdhawati; Manuntun Manurung; Ni Ketut Yuni Sri Lestari
Jurnal Kimia Sains dan Aplikasi Vol 22, No 6 (2019): Volume 22 Issue 6 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Preparation and validation of the Fe2O3 modified carbon paste electrode have been carried out for the analysis of dopamine by the voltammetry method. Validation parameters of carbon paste electrodes (CPA) tested include linear concentration range, Limit of Detection (LoD), Limit of Quantification (LoQ), accuracy, and selectivity in the presence of ascorbic acid and uric acid. The results obtained in the optimization of the composition and condition of the Fe2O3 modifier in graphite are 0.8% mass at pH 6 solution with the Brinton Robinson buffer solution. The peak potential shifted 32 mV in the negative direction from the initial peak potential of 319 mV at the carbon paste electrode without modification to the peak potential of 287 mV at the 0.8% Fe2O3 modified carbon paste electrode. The linear concentration range at concentrations of 8 µM–100 µM obtained a linear equation y= 1.1204 + 0.1289x with R2=0.99943. LoD value obtained is 0.23 µM, and the LoQ is 0.77 µM. In the selectivity test obtained in the dopamine analysis using 0.8% Fe2O3 modified carbon paste electrode, the anodic peaks of dopamine (75 mV), ascorbic acid (190 mV), and uric acid (200 mV) can be separated. This method has acceptable repeatability because it produces a Horwitz Ratio value of 0.0417, which is smaller than two. Preparation and validation of 0.8% Fe2O3 modified carbon paste electrode can be declared as eligible for the measurement of dopamine.

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