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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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Hidrorengkah Fraksi Berat Minyak Bumi Menggunakan Katalis Lempung Terpilar Aluminium Berpengemban Nikel Darmawan, Adi
Jurnal Kimia Sains dan Aplikasi Vol 7, No 1 (2004): Volume 7 Issue 1 Year 2004
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Telah dilakukan sintesis dan karakterisasi katalis lempung terpilar aluminium berpengemban nikel dari bahan lempung alam. Sintesis dilakukan dengan interkalasi polikation Al pada suspensi lempung. Lempung terpilar selanjutnya diimpregnasi dengan Ni dan dialiri gas N2, O2 dan H2. Uji aktivitas katalitik lempung terpilar dilakukan terhadap reaksi hidrorengkah fraksi 200-300Â°C minyak bumi. Analisis fasa cair minyak bumi hasil perengkahan dilakukan dengan menggunakan kromatografi gas. Hasil aplikasi pada hidrorengkah menunjukkan hahwa katalis lempung terpilar dapat melakukan konversi yang baik pada fraksi Cl8-ke atas dan lebih selektif terhadap fraksi C13-C17.

Pengaruh Komposisi Elektrolit pada Proses Penyisihan Nikel dari Tiruan Air Limbah Elektroplating Menggunakan Sel Elektrodeposisi Dua Ruang Selly Ayu Janetasari; Djaenudin Djaenudin
Jurnal Kimia Sains dan Aplikasi Vol 22, No 4 (2019): Volume 22 Issue 4 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Research of removal of soluble nickel from artificial electroplating wastewater has been investigated. The research aim to know optimum electrolit composition in nickel electrodeposition process. This study was conducted within a batch system using double chamber electrodeposition cell separated by water hyacinth leaf. Electrodeposition cell was equipped with a copper plate as cathode, graphite plate as anode, H2SO4 anolyte, NiSO4 catholyte with Na2SO4 added as supporting electrolyte. Electrodeposition performed at 5V direct current voltage for 4 hours each running and varied the concentration of H2SO4 anolyte (0,2 M; 0,6 M and 1 M), pHinitial catholyte (2; 4 and 6) and Na2SO4 (catholyte) supporting electrolyte (0 M; 0,2 M; 0,6 M and 1 M). The statistic analysis results showed that the concentration of 0.2 M H2SO4, pHinitial catholyte of 6 and 0.2 M Na2SO4 with an optimum concentration of nickel concentration values decrease of 18,433 % and nickel deposition on the cathode of 0.042 grams.

Lempung Terpilar Silika untuk Penghilangan Fenol dalam Air Adi Darmawan; Choiril Azmiyawati; Pulojuliadi Nababan
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

Limbah fenol dapat mencemari lingkungan, namun pengolahan limbah fenol masih memiliki banyak kendala. Kendala disebabkan proses pengolahan yang menggunakan prinsip flokulasi dan koagulasi dengan biaya instalasi dan operasional yang mahal. Menanggapi kendala tersebut lempung terpilar SiO2 mampu digunakan sebagai katalis oksidasi fenol dalam air limbah.Lempung terpilar SiO2 memiliki basal spacing, luas permukaan besar, dan stabil pada temperatur tinggi. Sintesis lempung terpilar SiO2 melalui proses interkalasi TEOS (tetraetilortosilikat) dan surfaktan dodesilamin pada daerah antarlapis lempung. Lempung terpilar SiO2 diimpregnasi dengan menggunakan logam nikel. Proses sintesis lempung terpilar SiO2 dikarakterisasi menggunakan metode difraktometer sinar X dalam menentukan kenaikan basal spacing dan kristalinitas. Penentuan aktivitas katalis lempung terpilar SiO2/Ni terhadap konversi oksidasi fenol dalam air limbah menggunakan spektrofotometri UV-Visible.Lempung terpilar tanpa kalsinasi mengasilkan basal spacing 28,55 Å sedangkan lempung terpilar SiO2 kalsinasi 600 OC menghasilkan basal spacing 27,77 Å. Aplikasi lempung terpilar SiO2/Ni sebagai katalis oksidasi fenol dalam air limbah mampu mengkonversi limbah fenol hingga mencapai 70 %. Aktivitas katalis SiO2 optimalisasi pada konsentrasi nikel yang teremban 4 %, dimana semakin banyak nikel yang teremban pada lempung terpilar SiO2 maka aktivitas katalisisnya semakin meningkat

Dimerisasi Metilisoeugenol dengan Katalis HCl Ngadiwiyana, Ngadiwiyana; Soelistyowati, Retno Dwi; Sastrohamidjojo, Hardjono
Jurnal Kimia Sains dan Aplikasi Vol 5, No 3 (2002): Volume 5 Issue 3 Year 2002
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Telah dilakukan reaksi adisi terhadap metilisoeugenol dengan HCl dalam pelarut CCl4, CH2Cl2, CH3OH, CH3CH2OH dan tanpa pelarut. Metilisoeugenol merupakan hasil isomerisasi metileugenol. Reaksi adisi metilisoeugenol dengan HCl dilakukan dengan mengalirkan gas HCl ke dalam metilisoeugenol sambil diaduk selama 3 jam. Reaksi adisi dilakukan pada suhu 15 oC. Pemurnian terhadap hasil reaksi menghasilkan endapan putih kecoklatan. Analisis menggunakan spektrofotometer IR, spektrometer 1H-NMR dan kromatografi gas-spektrometer massa terhadap hasil tersebut memberikan keterangan bahwa senyawa utama yang dihasilkan adalah senyawa dimer metilisoeugenol yaitu 9,10-dietil-2,3,6,7-tetrametoksi-9,10-dihidroantrasena.

Katalis Zn/Zeolit Alam dan Pengujian Aktivitasnya pada Konversi Metanol Menjadi Hidrokarbon Ismiyarto, Ismiyarto
Jurnal Kimia Sains dan Aplikasi Vol 3, No 3 (2000): Volume 3 Issue 3 Year 2000
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Telah dilakukan sintesis katalis Zn/Zeolit alam dengan metode impregnasi menggunakan larutan [ZN(NH3)4(NO3)2] dan zeolit alam dari Cipatujah, Jawa Barat dengan variasi tempeatur reduksi. Sintesis katalis Zn/Zeolit alam dengan temperatur oksidasi 350oC dan temperatur reduksi 400oC mempunyai karakter katalis yang paling optimal, mempunyai keasaman total 4,07 mmol NH3/g dan kandungan Zn 0,81%. Dibandingkan dengan katalis H+-zeolit alam dengan reaksi thermal, energi aktivasi (Ea) konversi metanol menjadi hidrokarbon menggunakan katalis Zn/zeolit alam mempunyai harga relatif kecil. Analitis konversi metanol menjadi hidrokarbon dilakukan dengan kromatografi gas.

Utilization of Coconut Shell as Cr2O3 Catalyst Support for Catalytic Cracking of Jatropha Oil into Biofuel Isalmi Aziz; Yessinta Kurnianti; Nanda Saridewi; Lisa Adhani; Wahyu Permata
Jurnal Kimia Sains dan Aplikasi Vol 23, No 2 (2020): Volume 23 Issue 2 Year 2020
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Coconut shell waste is a waste that has a high carbon content. Carbon in coconut shell waste can be converted into activated carbon having a large surface area. This potential property is suitable to apply the coconut shell as catalyst support. To increase the catalytic activity, metal oxides such as Cr2O3 are impregnated. The purpose of this study is to synthesize Cr2O3/carbon catalyst and test its catalytic activity on catalytic cracking of Jatropha oil. The first stage was the synthesis of activated carbon and the determination of its proximate and ultimate. The second step was impregnation to produce Cr2O3/carbon catalyst. Furthermore, X-Ray Diffraction to determine crystallinity, Surface Area Analyzer to identify its surface area and Fourier Transform Infrared to analyze functional groups. Then the catalytic activity was tested on the catalytic cracking of Jatropha oil. In addition, the chemical compound composition and biofuel selectivity of the catalytic cracking product was determined using Gas Chromatography-Mass Spectrometer. Proximate analysis results showed that activated carbon contains 9%, 1%, 23%, and 67% of water, ash, evaporated substances, and bound carbon, respectively. The results of the ultimate analysis resulted in carbon (C), hydrogen (H), and nitrogen (N) contents of 65.422%, 3.384%, and 0.465%, correspondingly. The catalyst crystallinity test showed the presence of Cr2O3 peaks at 2θ: 24.43°; 33.47° and 36.25° according to JCPDS No. 84-1616. In the absorption area of 400-1000 cm-1 and the range of 2000 cm-1 showed the presence of Cr-O stretching due to Cr2O3 adsorbed into the activated carbon structure. The surface area of activated carbon and Cr2O3/carbon catalysts with a concentration of 1.3, and 5% was 8.930 m2/g; 47.205 m2/g; 50.562 m2/g; and 38.931 m2/g, respectively. The catalytic activity test presented that the best performance was showed by Cr2O3/carbon catalyst with a concentration of 5% indicated by conversion of Jatropha oil into biofuel of 67.777% with gasoline selectivity, kerosene, and diesel of 36.97%, 14.87%, and 15.94%, correspondingly.

Kitosan sebagai Bahan Dasar Drug Delivery: Studi Interaksi Segmen Dimer Kitosan dengan Vitamin C secara Komputasi Ab Initio dan Eksperimen Sekar Kusuma Dewi; Tri Windarti; Parsaoran Siahaan
Jurnal Kimia Sains dan Aplikasi Vol 16, No 2 (2013): Volume 16 Issue 2 Year 2013
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Studi interaksi antarmolekul antara kitosan dan vitamin C secara komputasi ab initio dan eksperimen untuk memahami penggunaan kitosan sebagai bahan dasar drug delivery telah dilakukan. Parameter yang dianalisis adalah energi interaksi dan spektra IR. Perhitungan dilakukan terhadap dua konformasi interaksi yaitu antara sisi atom N segmen dimer kitosan bermuatan parsial negatip masing-masing dengan sisi atom H pada cincin vitamin C yang bermuatan parsial positip (konformasi I) dan sisi atom H di luar cincin (konformasi II). Energi dan jarak interaksi konfigurasi I masing-masing sebesar -62,263 kJ mol-1 dan 1,897 Å, sedangkan konfigurasi II sebesar -32,641 kJ mol-1 dan 2,226 Å. Spektra IR menunjukkan mode-mode vibrasi pada kedua senyawa yang berinteraksi. Kesimpulan hasil pemodelan adalah bahwa kitosan dapat mengikat vitamin C dengan energi yang berbeda. Hasil pemodelan diverifikasi dengan absorpsi vitamin C oleh kitosan melalui pencampurkan 2,5 g kitosan dan 0,25 % larutan vitamin C. Pengukuran vitamin C yang tersisa dan uji lepas lambat vitamin C yang terserap dalam kitosan dalam media air dilakukan dengan spektrofotometer UV-Vis. Hasil eksperimen menunjukkan bahwa kitosan dapat menyerap vitamin C sebesar 46,5 % serta pada 10 menit pertama konsentrasi vitamin C yang dilepas sebesar 95,15 ppm.

Formulasi Larutan Pencuci dari Surfaktan Hasil Sublasi Limbah Laundry Puspitasari Puspitasari; Arnelli Arnelli; Ahmad Suseno
Jurnal Kimia Sains dan Aplikasi Vol 16, No 1 (2013): Volume 16 Issue 1 Year 2013
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Telah dilakukan penelitian tentang perumusan cairan pencuci dari surfaktan sublasi dari limbah laundry. Tujuan penelitian ini adalah untuk mengetahui formula cairan pencuci hasil surfaktan substitusi dari limbah cucian dan detergensi optimal dari cairan pencuci yang diformulasikan. Salah satu metode yang dapat diterapkan untuk mendapatkan surfaktan dari air limbah bekas adalah metode sublasi. Penelitian dilakukan dalam tiga tahap, yaitu sublasi limbah cucian, karakterisasi surfaktan, dan uji detergensi. Penentuan jumlah surfaktan menggunakan metode MBAS, penentuan kelompok fungsional surfaktan menggunakan FTIR, detergensi dengan sublasi surfaktan dengan memvariasikan pH, Sodium Tripoly Phosphate (STPP), Carboxyl Methyl Cellulose (CMC). Hasil penelitian menunjukkan bahwa surfaktan yang berasal dari proses sublasi adalah alkilbenzena sulfonat lurus (LAS). Hal ini ditunjukkan oleh spektrum FTIR yang menunjukkan beberapa kelompok fungsi seperti alkil, sulfonat dan pengganti cincin aromatik. Surfaktan anionik mengalami penurunan sebesar 81,43%. Hasil uji detergensi diperoleh detergensi optimum 90,49%, formula cairan pembersih 21% surfaktan, STPP 60%, pH 10,5, 1% CMC.Telah dilakukan penelitian tentang perumusan cairan pencuci dari surfaktan sublasi dari limbah laundry. Tujuan penelitian ini adalah untuk mengetahui formula cairan pencuci hasil surfaktan substitusi dari limbah cucian dan detergensi optimal dari cairan pencuci yang diformulasikan. Salah satu metode yang dapat diterapkan untuk mendapatkan surfaktan dari air limbah bekas adalah metode sublasi. Penelitian dilakukan dalam tiga tahap, yaitu sublasi limbah cucian, karakterisasi surfaktan, dan uji detergensi. Penentuan jumlah surfaktan menggunakan metode MBAS, penentuan kelompok fungsional surfaktan menggunakan FTIR, detergensi dengan sublasi surfaktan dengan memvariasikan pH, Sodium Tripoly Phosphate (STPP), Carboxyl Methyl Cellulose (CMC). Hasil penelitian menunjukkan bahwa surfaktan yang berasal dari proses sublasi adalah alkilbenzena sulfonat lurus (LAS). Hal ini ditunjukkan oleh spektrum FTIR yang menunjukkan beberapa kelompok fungsi seperti alkil, sulfonat dan pengganti cincin aromatik. Surfaktan anionik mengalami penurunan sebesar 81,43%. Hasil uji detergensi diperoleh detergensi optimum 90,49%, formula cairan pembersih 21% surfaktan, STPP 60%, pH 10,5, 1% CMC.

Modification of Activated Carbon from Rice Husk using Hexadecyltrimethylammonium Bromide (HDTMA-Br) Surfactant and ZnCl2 activator and Microwaves for Nitrate Ion Adsorption Yeni Aprilia; Arnelli Arnelli; Yayuk Astuti
Jurnal Kimia Sains dan Aplikasi Vol 23, No 11 (2020): Volume 23 Issue 11 Year 2020
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Surfactant Modified Activated Carbon (SMAC) is a surfactant-modified activated carbon product. The surfactant used in this study was the cationic surfactant Hexadecyltrimethylammonium Bromide (HDTMA-Br). These surfactants can change the activated carbon's surface to be positively charged due to the presence of the surfactant hydrophilic groups. This SMAC is more selective in absorbing anions, which in this study is for the adsorption of nitrate anions. This research aims to prepare a new material that is superior to activated carbon in absorbing nitrate anions. This research was conducted in several stages. In the first stage, rice husk was carbonized through pyrolysis at 300°C for 10 minutes. In the second stage, carbon was activated using 30% ZnCl2 and microwaves for 5 minutes and 400 W. The third stage was modifying activated carbon by contacting or adsorbing HDTMA-Br on activated carbon. The concentration of HDTMA-Br varied at 200-400 ppm and the adsorption time was 3-7 hours. The success of the modification was measured by the efficiency of HDTMA-Br in modifying activated carbon. This is supported by the results of the characterization of FTIR, GSA, SEM, and thermodynamic parameters. The resulting SMAC was applied for the adsorption of nitrate anions, and the results were compared to carbon and activated carbon. The results indicate that the best SMAC is formed at an optimum concentration of 300 ppm, within 4 hours, with an adsorption efficiency of 97.345%. The characterization results also show that SMAC has been formed, as evidenced by the presence of a peak at a wavenumber of about 1500 cm-1, a C-N group derived from N(CH3)3 in the HDTMA-Br surfactant structure. The SMAC spectra also appeared weak peaks at the wave number 2918 cm-1, which indicated the CH2-R group stretching from the HDTMA-Br surfactant. SEM image shows that HDTMA-Br has covered the pores of activated carbon. Meanwhile, the SMAC surface area is lower than that of activated carbon. Thermodynamic parameters indicate that HDTMA-Br interacts physically with activated carbon. The adsorption capacity of nitrate anion by SMAC is 3,638 mg/g, higher than carbon and activated carbon.

Adsorption of Methylene Blue Dye using Fe3O4 Magnetized Natural Zeolite Adsorbent Donatus Rendo
Jurnal Kimia Sains dan Aplikasi Vol 24, No 2 (2021): Volume 24 Issue 2 Year 2021
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Preparation and characterization of Fe3O4 magnetized natural zeolite adsorbent for adsorption of methylene blue dye have been carried out. Natural zeolite/Fe3O4 adsorbent preparation was carried out using coprecipitation of Fe2+ and Fe3+ ions (1: 2 mol ratio) on the natural zeolite surface. Characterization was carried out using X-Ray Diffraction (XRD), Fourier Transform Infra-Red (FTIR), and Scanning Electron Microscopy (SEM) to determine the effect of Fe3O4 on the natural zeolite surface. UV-Vis spectroscopy was used to determine the concentration of methylene blue after the adsorption process. The characterization results showed that Fe3O4 was successfully embedded in the natural zeolite without damaging the natural zeolite's crystallinity. Natural zeolite/Fe3O4 adsorbent showed easy separation from water medium after the adsorption process. The optimum conditions for adsorption were achieved at the contact time of 60 minutes, and the initial concentration of methylene blue was 30 ppm with an adsorbent mass of 25 mg. Adsorption kinetics followed pseudo-second-order reaction kinetics, and adsorption isotherm followed Langmuir isotherm with an adsorption capacity of 32.258 mg/g.

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