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INDONESIA
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 796 Documents
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Pemanfaatan Energi Hasil Pengolahan Limbah Cair Industri Tahu Djarwati Djarwati; Sartamtomo Sartamtomo; Sukani Sukani
Jurnal Kimia Sains dan Aplikasi Vol 3, No 2 (2000): Volume 3 Issue 2 Year 2000
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2534.423 KB) | DOI: 10.14710/jksa.3.2.66-70

Abstract

Gas yang dihasilkan dari pengolahan limbah cair industri tahu ditampung dengan suatu prototip penampungan gas. Diketahui bahwa laju produksi metan dalam gas bio adalah 284,88 liter per kg COD terolah atau setara dengan 28,06 liter gas metan per kg kedelai. Kalori yang dihasilkan adalah sekitar 2,536 Kkal per kg COD atau 0,249 Kkal per kg kedelai. Data dapat digunakan sebagai salah satu acuan untuk mendesain IPAL dan penampung gas bio sesuai dengan kapasitas limbah tahu yang diolah.
Activation of Natural Zeolite and Its Application for Adsorbents in Domestic Wastewater Treatment in Tembalang District, Semarang City Suhartana Suhartana; Pardoyo Pardoyo
Jurnal Kimia Sains dan Aplikasi Vol 23, No 1 (2020): Volume 23 Issue 1 Year 2020
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2575.252 KB) | DOI: 10.14710/jksa.23.1.28-33

Abstract

Tembalang is one of the districts in the city of Semarang whose economic growth is rapid. There are 12 sub-districts in Tembalang district, one of which is the Tembalang sub-district, which is within the campus area of Diponegoro University. When compared with other sub-district in the Tembalang district, the Tembalang sub-district community's need for clean water and domestic wastewater disposal is very high because of its dense population. Handling domestic wastewater is one of the environmental problems, which is interesting to study. Domestic wastewater, in addition to causing environmental pollution, can also cause discomfort and even health problems. One way to reduce the impact of domestic wastewater is to treat domestic wastewater before the environment is discharged. This study aims to describe the character of domestic wastewater in Tembalang sub-district, Tembalang district, Semarang city, and the use of activated zeolites and activated zeolites to reduce COD, pH, BOD, and TSS in domestic wastewater. Also, to compare the parameters of wastewater with regulations in force (Minister of Environment and Forestry Regulation No: 68 of 2016). This research is expected to improve the quality of domestic wastewater by adsorption using natural zeolite and activated zeolite adsorbents. The results showed that the adsorption treatment with natural zeolites and activated zeolites significantly improved water quality. The results of adsorption by natural zeolites showed a decrease in COD of 21.8%, a pH of 11.5%, BOD of 9.2%, and a TSS of 10.8%. Whereas adsorption by HCl-activated zeolite resulted in a decrease in COD of 78.9%, pH of 16.2%, BOD of 11.8% & TSS of 74.4%. While H2SO4-activated natural zeolite reduced COD by 85.5%, pH 17.9%, BOD 12.6% and TSS 89.7%.
Isolasi, Identifikasi dan Uji Sitotoksik Senyawa Alkaloid Daun Ketapang yang Sudah Menguning (Terminalia cattapa Linn) Ferdian Cahya Prima; Dewi Kusrini; Enny Fachriyah
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (322.25 KB) | DOI: 10.14710/jksa.16.2.55-58

Abstract

Telah dilakukan proses isolasi senyawa alkaloid indol daun ketapang yang sudah menguning (Terminalia Cattapa Linn) dengan metode ekstraksi Asam-Basa. Hasil isolasi diperoleh senyawa alkaloid total sebesar 1,423 gram (percent 0,287%). Analisis menggunakan spektrofotometri UV-Vis menunjukkan adanya serapan pada panjang gelombang 206 dan 224 nm, yang mengindikasikan bahwa senyawa alkaloid memiliki kerangka dasar indol. Uji sitotoksik diperoleh harga LC50 sebesar 157,004 ppm.
Studi Salinitas Air terhadap Penyerapan Logam Berat Merkuri oleh Ikan Mujair (Tilapia mosambicca) Sumarawati, Titiek
Jurnal Kimia Sains dan Aplikasi Vol 2, No 3 (1999): Volume 2 Issue 3 Year 1999
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (6587.424 KB) | DOI: 10.14710/jksa.2.3.90-98

Abstract

Merkuri adalah logam berat yang toksik didam jumlah kecil, akan tetapi toksisitasnya bervariasi tergantung dari bentuk senyawa kimianya dan tempat pemaparannya. Dalam perairan, kandungan logam merkuri sekalipun kadarnya relatif rendah, dapat diabsorbsi dan terakumulasi secara biologis oleh ikan dan akan terlibat dalam sistim jaringan makanan. Pengamatan penelitian ini melihat kondisi air tambak oso yang meliputi suhu, pH, salinitas, kandungan merkuri dalam air dan kandungan merkuri dalam ikan mujair. Jenis penelitian ini adalah penelitian analitik yang bersifat observasional, yang dilakukan secara cross-sectional. Hasil dari penelitian ini menunjukkan bahwa kandungan logam merkuri dalam air rata rata sebesar 0,0024 ppm, di mana suhu berfluktasi, pH dan salinitas adalah relatif rendah. Rata rata suhu dari air 28,23°C, pH 7,28 dan salinitas 0,3084 o/ooo. Merkuri dalam sampel ikan mujair rata-rata sebesar 0,00084 ppm. Sampel ikan mujair yang berumur 3 bulan. 4 bulan dan 5 bulan mempunyai kandungan merkuri yang berbeda
Polymerization Domain Translated from 0.9 kb Gene Fragment of DNA Polymerase I from a Thermo-Halophilic PLS A Strain Teuku Mohamad Iqbalsyah; Muhammad A Velayati; Hira Helwati; Febriani Febriani
Jurnal Kimia Sains dan Aplikasi Vol 23, No 5 (2020): Volume 23 Issue 5 Year 2020
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2315.333 KB) | DOI: 10.14710/jksa.23.5.183-188

Abstract

The search for novel DNA Polymerases I, with higher fidelity and better polymerization rate, is essential to improve the Polymerase Chain Reaction method. A thermo-halophilic bacterium has been isolated from an undersea hot spring, dubbed Pria Laot Sabang (PLS) A strain. The 0.9 kb DNA Polymerase I gene fragments from the isolate were amplified, sequenced, and identified. The fragments were part of the polymerization domain of the enzyme. Homological analysis of the gene sequence showed that the PLS A strain was closely related to Bacillus caldolyticusstrain XM. However, Swissprot structural analysis reveals that PLS A strain had high homology to Geobacillus stearathermophilus. Full sequence analysis is still needed to identify the species and evaluate the intact enzyme structure.
Adsorpsi Ion Logam Mg(II) Menggunakan Kitosan Termodifikasi Asam Askorbat Wawan Prasetyo; Khabibi Khabibi; Didik Setiyo Widodo
Jurnal Kimia Sains dan Aplikasi Vol 17, No 2 (2014): Volume 17 Issue 2 Year 2014
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (469.767 KB) | DOI: 10.14710/jksa.17.2.70-74

Abstract

Modifikasi kitosan-asam askorbat dan pemanfaatannya sebagai adsorben ion logam Mg(II), ion logam Cd(II), dan campuran ion logam Mg(II)-Cd(II), juga dilakukan penentuan pH dan waktu kontak optimum untuk adsorpsi ion Mg(II), serta mengetahui kemampuan adsorpsi kitosan-asam askorbat terhadap ion Mg(II) telah dilakukan. Tahapan penelitian terdiri dari penentuan derajat deasetilasi dari kitosan awal, proses re-deasetilasi, dan penentuan derajat deasetilasi kitosan dari hasil re-deasetilasi menggunakan FTIR. Setelah itu kitosan hasil re-deasetilasi dimodifikasi menggunakan asam askorbat dan dianalisis menggunakan FTIR dan SEM. Kitosan asam-askorbat digunakan untuk menentukan pH dan waktu kontak optimum adsorpsi terhadap ion logam Mg(II) serta kemampuannya sebagai adsorben pada ion logam Mg(II), Cd(II), dan campuran ion logam Mg(II)-Cd(II). Ditemukan bahwa pH dan waktu kontak optimum adsorpsi kitosan-asam askorbat terhadap ion logam Mg(II) yaitu pada pH 5 dan waktu kontak 12 jam. Kemampuan adsorpsi pada uji ion logam Mg(II) sebesar 24,66 mg/g, Cd(II) sebesar 24,71 mg/g serta kemampuan adsorpsi kitosan asam-askorbat pada uji campuran ion logam Mg(II) dan Cd(II), didapatkan Mg(II) sebesar 24,45 mg/g, Cd(II) sebesar 24,61 mg/g.
Perbaikan Mutu Fraksi Kerosin Melalui Proses Adsorpsi oleh Karbon Aktif Arnelli, Arnelli; Hanani, Asti
Jurnal Kimia Sains dan Aplikasi Vol 9, No 2 (2006): Volume 9 Issue 2 Year 2006
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (167.091 KB) | DOI: 10.14710/jksa.9.2.30-34

Abstract

Proses adsorpi menggunakan karbon aktif telah digunakan untuk mengurangi kandungan senyawa sulfur dan meningkatkan kualitas warna pada fraksi kerosin. Hasil penelitian menunjukkan bahwa berat karbon aktif dan waktu kontak optimum pada proses adsorpsi adalah 150 gram dan 80 menit dengan pengurangan kandungan sulfur 32,2 % sedangkan kualitas warna meningkat 87,5 % dengan demikian proses adsorpsi oleh karbon aktif lebih efektif dalam meningkatkan kualitas warna fraksi kerosin.Kata kunci: Adsorpsi, karbon aktif, fraksi kerosin
Biolubrication Synthesis Made from Used Cooking Oil and Bayah Natural Zeolite Catalyst Agus Rochmat; Athia Hasna Nurhanifah; Yunita Parviana; Suaedah Suaedah
Jurnal Kimia Sains dan Aplikasi Vol 21, No 3 (2018): Volume 21 Issue 3 Year 2018
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2205.091 KB) | DOI: 10.14710/jhp.%v.%i.28-36

Abstract

Automotive growth in Indonesia continues to increase, thus the needed of material that supported such as lubricants have also increased. To support environment to have a sustainable development, the world needs biodegradable lubricant or biolubricant. Biolubricant can match the characteristics and replace the function of petroleum-based lubricants. The biolubricant base material at the moment was the vegetable oil through a series of physically and chemically modified. This research synthesizes used cooking oil into biolubricant using natural zeolite catalyst, which in its production included esterification process of used cooking oil, synthesis of methyl ester and biolubricant synthesis. Biolubicant synthesis was conducted by variation of methyl ester mole ratio with ethylene glycol of 1:13-40 and catalyst mass range of 0.5%-3%. The results of the study showed that the highest yield was 83.46%, density 0.8994 g/mL, viscosity 40°C 52.90 cSt and at 100°C 8.74 cSt, the pour point 6°C and the flash point 278°C.
Pengaruh Konsentrasi Substrat Maltosa terhadap Potensial Listrik Baterai Lactobacillus bulgaricus (MFC) Farida Zulfah Fitriani; Linda Suyati; Wasino Hadi Rahmanto
Jurnal Kimia Sains dan Aplikasi Vol 20, No 2 (2017): Volume 20 Issue 2 Year 2017
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (686.725 KB) | DOI: 10.14710/jksa.20.2.74-78

Abstract

Baterai MFC merupakan bahan bakar penghasil potensial listrik dari oksidasi substrat organik dengan bantuan mikrobial. Salah satu faktor yang berperan dalam menentukan besar-kecilnya produksi listrik pada baterai MFC adalah konsentrasi substrat. Pengembangan baterai MFC berhubungan dengan substrat yang mudah dijangkau, contohnya adalah maltosa. Penelitian ini bertujuan untuk menentukan pengaruh konsentrasi substrat maltosa dalam baterai MFC, menentukan potensial listrik maksimum dengan variasi konsentrasi substrat maltosa menggunakan Lactobacillus bulgaricus, dan menentukan potensial standar maltosa (E°maltosa) berdasarkan persamaan Nernst. Pengukuran potensial listrik dilakukan pada variasi konsentrasi substrat maltosa 3-7%. Bakteri Lactobacillus bulgaricus dapat tumbuh dalam substrat maltosa dan mengalami peningkatan jumlah seiring dengan peningkatan konsentrasi substrat. Potensial listrik yang dihasilkan berhubungan dengan aktivitas bakteri terhadap substrat dan toksisitas pada bakteri mengakibatkan penurunan potensial listrik. Hasil pengukuran potensial dan arus listrik pada variasi konsentrasi 3-7% berturut-turut, 0,57 V; 0,51 V; 0,48 V; 0,46 V; 0,39 V. Secara teori menggunakan persamaan Nersnt diperoleh E°maltosa sebesar +0,5637 Volt. Hasil tersebut menunjukkan bahwa konsentrasi substrat berpengaruh dalam sistem baterai MFC.
Blue Methylene Retrieval using Silica-Salicylic Acid Modified Filtering Desriana Chrisyanti; Gunawan Gunawan; Abdul Haris
Jurnal Kimia Sains dan Aplikasi Vol 21, No 1 (2018): Volume 21 Issue 1 Year 2018
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (576.327 KB) | DOI: 10.14710/jksa.21.1.19-23

Abstract

The retrieval of methylene blue using a silica-modified sulfide-salicylic acid has been carried out. Salicylate-silica-acid alloys have been prepared by comparing the four media ie filter paper, silica-filter paper, salicylic acid-filter paper and salicylic acid-silica-filter paper. This study aims to study the recovery of methylene blue using salicylic acid-modified silica filtering with various parameters on the adsorption and desorption process. The results showed that the salicylic acid-silica alloy could improve the capability of methylene blue removal. The result of pH variation on the adsorption process showed that at pH 7 methylene blue can be taken 92.89%. Whereas at concentration variation, salicylic acid at 5 mM can take methylene blue equal to 92.86%. The desorption results showed that pH 1 methylene blue could be desorbed at 308.89 mg/g, while the variation of contact time of desorption ie at 110 minutes could an saturate the blue methylene by 589,61 mg/g. The UV-Vis analysis showed a decrease in absorbance in salicylic acid after contact with silica. The FTIR analysis also shows that in salicylate-silica-acid alloys there are Si-O groups derived from silica and C = O derived from salicylic acid.

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