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JURNAL KIMIA SAINS DAN APLIKASI
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 5 Documents
 1 
Search results for , issue "Vol 22, No 2 (2019): Volume 22 Issue 2 Year 2019" : 5 Documents clear
Synthesis, Characterization of Cu, S doped TiO2 and Its Photocatalytic Activity for Degradation of Remazol Black B Abdul Haris; Gunawan Gunawan; Didik Setiyo Widodo; Rahmad Nuryanto; Retno Ariadi Lusiana; Mei Viantikasari
Jurnal Kimia Sains dan Aplikasi Vol 22, No 2 (2019): Volume 22 Issue 2 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2623.307 KB) | DOI: 10.14710/jksa.22.2.47-51

Abstract

Copper and sulfur modified TiO2(Cu-S-TiO2) photocatalyst was successfully synthesized using TiCl4, Cu(NO3)2.3H2O and H2SO4 as precursors by the sol-gel method andcalcination at 450°C for 4 hours. The synthesized photocatalyst was characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDS), Diffuse Reflectance Spectroscopy (DRS), Brunauer Emmett Teller (BET) method. The XRD results showed that the Cu-S-TiO2 photocatalyst had an anatase phase with a crystal grain size of 17.54 nm. However, the SEM image of the modified TiO2 showed inhomogeneous phase due to the crystal clustering of imperfect homogenization during the synthesis and sintering processes. The patterns of EDSof Cu-S-TiO2depicted the elements of Ti, O, Cu and S with doping of Cu and S c.a. 7 and 1%, respectively. Analysis using DRS UV-Vis showed Cu-S-TiO2 was able to shift the absorption of the TiO2 photocatalyst wavelength to the visible region with a band energy gap of 1.9 eV. The BET analysis results showed that the specific surface area (SBET), pore volume (Vp) and average pore volume radius (Dp) were measured from large Cu-S-TiO2, therefore Cu-S-TiO2 had good physicochemical and photocatalytic properties. The photocatalytic activity of 0.1 g Cu-S-TiO2 with 15 Watt tungsten light irradiation for 4 h was able to degrade 50 mL remazol black B 10 mg/L c.a. 92.60 %.
Statistical Approach for Water Glass Precursor Preparation from Bamboo Leaf Silica Silviana Silviana; Bakti Jos; Herry Santosa; Siswo Sumardiono
Jurnal Kimia Sains dan Aplikasi Vol 22, No 2 (2019): Volume 22 Issue 2 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2643.773 KB) | DOI: 10.14710/jksa.22.2.52-57

Abstract

The bamboo leaf consists of high silica content. In this study, the bamboo silica was utilized as water glass. Water glass can also be used as eco-friendly precursors for the preparation of silica aerogel. The extraction process of silica from bamboo leaf have been carried out through acid leaching and combustion process at 750°C based on thermal gravimetry analysis. This paper is aimed to assess the effect of two types of alkali hydroxide and concentrations producing water glass of bamboo leaf silica. The result was analyzed by using a 22-factorial design with six replications. The alkali hydroxide types were sodium hydroxide and potassium hydroxide with a concentration of 4 M and 6 M, respectively. The study was executed in several steps, i.e. pre-treatment of bamboo leaf, leaching process, combustion, purification of bamboo leaf silica and synthesis of water glass. The optimum condition of water glass products was obtained at silica concentration of 41.08 ppm and density of 1.23 g/L for potassium hydroxide, while at 40.15 ppm and 1.30 g/L for sodium hydroxide. ANOVA analysis resulted in a significant effect for type of hydroxide and concentration releasing model for silica concentration response. This study also characterized the silica structure and composition by instrumentation analysis for silica solid obtained from optimum water glass condition with potassium hydroxide. It can be denoted the physical behavior of silica solid from water glass by potassium hydroxide did not differ from previous research of water glass by sodium hydroxide.
Validasi Metode Penentuan Tablet Allopurinol Menggunakan Spektrofotometri Ultraviolet dalam Larutan Asam Suprianto Suprianto; Ihsanul Hafiz; Hendri Faisal; Hasrat Masa Harefa
Jurnal Kimia Sains dan Aplikasi Vol 22, No 2 (2019): Volume 22 Issue 2 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3683.204 KB) | DOI: 10.14710/jksa.22.2.29-37

Abstract

Allopurinol sebagai obat tablet banyak beredar di pasaran, sehingga kadar allopurinol haruslah memenuhi persyaratan agar kualitas obat dijamin. Pada penelitian ini, validasi metode penentuan obat tablet allopurinol dalam tiga konsentrasi HCl, yaitu 0,05 N; 0,10 N; dan 0,15 N menggunakan spektrofotometri ultraviolet telah dilakukan. Parameter validasi meliputi uji linieritas, akurasi, presisi berulang, dan presisi menengah dan spesifik. Penentuan konten yang dilakukan dalam larutan HCl 0,10 N menghasilkan akurasi terbaik. Hasil penelitian menunjukkan bahwa panjang gelombang maksimum adalah pada 251 nm di mana linearitas, akurasi, presisi ulang, presisi pada pelarut HCl 0,10 N masing-masing adalah 0,9995; 100.1% - 100.6%; 0,076%; 0,057% - 0,127%. Tes spesifisitas menunjukkan hasil yang baik. Kandungan rata-rata allopurinol dalam tablet adalah 100,7% -102,3%. Sehingga kandungan rata-rata allopurinol dalam tablet memenuhi standart yang mengacu Indonesian Pharmacopoeia V Edition.
Pengaruh NaOH, Lignin dan Furfural terhadap Kesetimbangan Uap-Cair Etanol-Air Hidrolisat Ethanosolv-pulping Tandan Kosong Sawit pada Kondisi Isobarik Lienda Aliwarga; Herri Susanto; Reynard Reynard; Dewi Agustina Iryani
Jurnal Kimia Sains dan Aplikasi Vol 22, No 2 (2019): Volume 22 Issue 2 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4289.603 KB) | DOI: 10.14710/jksa.22.2.38-46

Abstract

Tandan kosong sawit mengandung lignoselulosa yang bermanfaat sebagai bahan baku pulp. Salah satu metode pulping adalah dengan menggunakan etanol, yang disebut sebagai proses ALCELL (Alcohol Cellulose). Proses ini menghasilkan lindi hitam, dan untuk meningkatkan keramahlingkungan dan efisiensinya, etanol perlu diregenerasi. Adanya lignin, furfural, dan NaOH dalam lindi hitam menurunkan volatilitas relatif etanol sehingga menyulitkan tahapan regenerasinya. Penelitian ini bertujuan untuk mendapatkan kondisi optimum regenerasi etanol melalui analisis kelarutan lignin dan kesetimbangan fasa uap-cair. Pengujian kelarutan lignin dilakukan dengan menjumputkan sejumlah lignin ke dalam 180 mL etanol-air. Percobaan kesetimbangan fasa menggunakan ebuliometer Fowler-Norris termodifikasi, dan simulasi selanjutnya memanfaatkan model UNIFAC (UNIQUAC Functional-group Activity Coefficients). Terdapat lima larutan model sebagai variasi, yaitu larutan A (etanol-air-0,315% NaOH), B (etanol-air-1,26% lignin), C (etanol-air-0,26% furfural), D (etanol-air-0,5% furfural), dan E (etanol-air-1% furfural). Operasi bersifat isobarik pada tekanan 690 mmHg dan temperatur ruang (±25°C). Hasil penelitian menunjukkan kenaikan kelarutan lignin hanya sedikit dipengaruhi oleh penambahan konsentrasi etanol jika konsentrasinya kurang dari 40%, namun meningkat secara signifikan dan mencapai maksimumnya pada konsentrasi etanol sekitar 70%. Menariknya, konsentrasi ini merupakan kondisi nyata proses ALCELL. Di lain pihak, pada konsentrasi etanol 60-70%, hampir terbentuk azeotrop baru karena faktor kelarutan lignin mencapai maksimumnya (65,7%). Oleh karena itu, lignin perlu diendapkan sebelum regenerasi etanol dengan mengurangi rasio penambahan air. Kehadiran furfural menggeser titik azeotrop yang semula 89%-mol menjadi 72%-mol untuk penambahan 0,26%-massa furfural dan dari 70%-mol untuk penambahan 0,5%-massa furfural. Sebagai tambahan, pemodelan UNIFAC dapat direkomendasikan untuk memprediksi data kesetimbangan fasa uap-cair etanol-air-furfural dengan komposisi etanol di bawah 80%-massa.
Review: Potensi mikrobial selulase, xilanase, dan protease dalam fermentasi kopi luwak (Paradoxurus hermaphroditus) secara in vitro Warsono El Kiyat; Dessy Mentari; Natalia Santoso
Jurnal Kimia Sains dan Aplikasi Vol 22, No 2 (2019): Volume 22 Issue 2 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (281.871 KB) | DOI: 10.14710/jksa.22.2.58-66

Abstract

Kopi luwak adalah kopi bernilai tinggi dengan aroma dan rasa khas, yang dihasilkan dari biji kopi yang telah difermentasi sebagian dalam sistem pencernaan luwak (Paradoxurus hermaprodithus). Tingginya permintaan kopi ini dan produksi alami yang unik berimplikasi pada praktek pemaksaan dan penyiksaan hewan luwak, serta adanya kontroversi status kehalalan produk. Fermentasi in vitro menggunakan selulase, xilanase, dan protease yang diisolasi dari kotoran luwak tampaknya dapat menjadi alternatif proses untuk menghindari masalah pelecehan hewan, menjamin kehalalan produk serta memastikan keberlanjutan produksi kopi luwak. Kajian ini bertujuan untuk meringkas dan mensintesis peran tiga enzim ini (selulase, xilanase, dan protease) dalam fermentasi in vitro kopi luwak dan pengaruhnya pada karakteristik kimia dan sensori berdasarkan hasil-hasil penelitian terbaru. Hasil kajian menunjukkan bahwa fermentasi in vitro menggunakan selulase, xilanase, dan protease. biji kopi menghasilkan karakteristik kimia dan sensorik yang sama dengan yang dihasilkan melalui proses alami yang melibatkan hewan luwak.

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