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All Journal JURNAL KIMIA SAINS DAN APLIKASI Alchemy : Journal of Chemistry Greensphere: Journal of Environmental Chemistry

Sriyanti Sriyanti

Chemistry Department, Faculty Of Sciences And Mathematics, Diponegoro University Jl. Prof. Soedarto, SH., Tembalang, Semarang

Author-ID : 5302683

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Materials Science & Nanotechnology

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Articles

Pilarisasi Lempung Dengan Al/Cr sebagai Adsorben Minyak Sisa Pakai Tiska Eva Triandhani; Taslimah Taslimah; Sriyanti Sriyanti
Greensphere: Journal of Environmental Chemistry Vol 1, No 1 (2021): Volume 1 Issue 1 tahun 2021
Publisher : Universitas Diponegoro

Minyak goreng yang digunakan berulang kali dapat mengakibatkan kerusakan minyak. Salah satu solusi untuk menanganinya ialah dengan metode adsorpsi. Lempung terpilar Al/Cr telah dibuat sebagai adsorben minyak sisa pakai. Penelitian ini bertujuan untuk menentukan suhu optimum kalsinasi pada pemilaran lempung dengan Al/Cr dan menentukan kualitas minyak sisa pakai berdasarkan bilangan asam dan bilangan peroksida. Karakterisasi lempung terpilar menggunakan X-Ray Diffraction (XRD). Selanjutnya daya adsorpsi lempung terpilar terhadap minyak sisa pakai diukur menggunakan Spektrofotometer UV-Vis. Uji kualitas minyak dilakukan berdasarkan penentuan bilangan asam dan bilangan peroksida sesuai syarat mutu minyak goreng yaitu SNI 01-3741-2013. Hasil penelitian menunjukkan bahwa, pemilaran lempung Al/Cr dapat meningkatkan basal spacing. Lempung terpilar Al/Cr dengan suhu kalsinasi 400°C memiliki basal spacing terbesar yaitu fraksi ringan 18,84 Å dan fraksi berat 16,53 Å. Kemampuan lempung terpilar Al/Cr untuk adsorpsi minyak sisa pakai memiliki daya serap besar pada suhu kalsinasi 400°C yaitu pada fraksi berat 9,16 % dan fraksi ringan 6,28 %. Lempung terpilar Al/Cr mampu menurunkan bilangan asam dan bilangan peroksida, bahwa semakin lama waktu kontak adsorpsi bilangan asam dan bilangan peroksida semakin menurun. Kata Kunci : Lempung terpilar Al/Cr, minyak sisa pakai, bilangan asam, bilangan peroksida

Optimization of Electrocoagulation Conditions in the Degradation Process of Carbofuran Waste (Furadan 3GR) Using Al/Graphite Electrodes Damar Nurwahyu Bima; Kumala Devi; Suhartana Suhartana; Sriyanti Sriyanti
ALCHEMY:Journal of Chemistry Vol 11, No 1 (2023): ALCHEMY: JOURNAL OF CHEMISTRY
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/al.v11i1.15360

Electrocoagulation is one of the electrochemical methods for treating wastewater and separating pollutants. In this research, the electrocoagulation using Al/Graphite electrodes was applied to artistic wastewater containing carbofuran to see the reduction of its chemical oxygen demand(COD). The electrocoagulation process was chosen in this study based on several advantages, including easy to separate between impurities and the sample and a simple operating system. Several parameters such as electrolysis time, variations in electrolyte concentration, and the effect of pH have been investigated for their impact on the electrocoagulation process. The results showed that the proportion of the best reduction in chemical oxygen demand (COD) was 64.40%. The best conditions were an electrolysis time of 60 minutes, an electrolyte concentration of 0.15 M, and a pH of 10. The results also show that the decrease in chemical oxygen demand (COD) dependson those parameters. These results were investigated further by characterization using UV-Vis spectrophotometry and FTIR spectroscopy. The results of the UV-Vis spectrum showed a decrease in intensity at a wavelength of 275 nm. Analysis of the FTIR spectrum between the initial sample and the results of the electrocoagulation showed that there were similar absorption peaks but with much smaller intensity, indicating that the effluent's pollutants have been deposited.Keywords: Electrocoagulation, Carbofuran, Al/Graphite, COD

Pengaruh Pemerangkapan Enzim Alkalin Fosfatase ke dalam Silika dari Abu Sekam Padi terhadap Aktivitas Enzimatiknya Sriyanti Sriyanti
Jurnal Kimia Sains dan Aplikasi Vol 20, No 1 (2017): Volume 20 Issue 1 Year 2017
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Alkalin fosfatase telah diperangkap ke dalam silika dari abu sekam padi melalui proses sol-gel. Dalam prosedur ini, larutan silika dihasilkan melalui ekstraksi abu sekam padi menggunakan larutan natrium hidroksida 1,5 N. Larutan asam klorida 0,1 N ditambahkan untuk menurunkan pH larutan silika hingga 10. Alkalin fosfatase (dalam larutan buffer tris-HCl pH:8) ditambahkan ke dalam larutan silika, didiamkan di dalam desikator hingga terbentuk gel. Gel kering merupakan enzim terperangkap (terenkapsulasi). Parameter katalitik dan kinetik ditentukan baik untuk enzim bebas dalam larutan maupun untuk enzim terimobilisasi. Hasil menunjukkan bahwa pH dan suhu optimal untuk alkalin fosfatase terimobilisasi dalam silika adalah 9,0 dan 45◦C, lebih tinggi dibandingkan dengan bentuk bebasnya (8,5 dan 40◦C). Pada suhu kamar dan pH 8,5, konstanta Michaelis-Menten (Km) adalah 7,50 mM dan aktivitas spesifiknya adalah 0,051 U/mg enzim untuk alkalin fosfatase terenkapsulasi, sedangkan untuk alkalin fosfatase bebas dalam larutan berturut-turut 0,08 mM dan 1,041 U/mg enzim.

Encapsulation of Alkaline Phosphatase in Mesoporous Methyl-Silica Hybrid by Sol-Gel Process Sriyanti Sriyanti
Jurnal Kimia Sains dan Aplikasi Vol 20, No 3 (2017): Volume 20 Issue 3 Year 2017
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

In recent years, the sol-gel technique has attracted increasing interest as a unique approach to immobilize biomolecules for bioanalitical applications as well as biochemical and biophysical studies. In this research, encapsulation of Alkaline Phosphatase (ALP) enzyme in mesoporous methyl-silica hybrid by sol-gel process has been carried out. Mesoporous methyl-silica hybrid has been synthesis by using tetraethylorthosilicate (TEOS) and methyltriethoxysilane (MTES) as precursor and poly(ethylene) glycol (PEG) as a polymer dopant. The preparation of methyl-silica hybrid was carried out at various mol ratios of precursors and PEG concentration. Encapsulation was emphasized by mixing sol solution and tris-HCl buffer containing ALP. The Surface Area Analyzer analysis data showed that the pore diameter and surface area of methyl-silica hybrid tended to increase as the PEG dopant concentration increases. Result showed that ALP encapsulated in the methyl-silica hybrids with PEG dopant gave enzymatic activity as 0.112 U/mg enzyme, higher than ALP encapsulated in copolymerization of TEOS with MTES or in silica from TEOS precursor only (0.098 U/mg enzyme and 0.069 U/mg enzyme, respectively). It was shown that copolymerization of TEOS with organosilane precursor and the entrapment of polymer additives into sol-gel processed materials are useful methods for modifying the internal environment and hence the activity of biomolecules entrapped in sol-gel derived biomaterials.

Effect of Acid on Natural Zeolite Dealumination on Indigo Carmine Adsorption Capability Nanik Sulistyowati; Sriyanti Sriyanti; Adi Darmawan
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

Modifying natural zeolite with dealumination using H2SO4 and HCl, and its application to adsorb indigo carmine has been performed. Dealumination was carried out by reacting a natural zeolite with a mixture of KMnO4-H2SO4 and a mixture of KMnO4-HCl then refluxed for 5 hours followed by washing with demineralized water until a neutral pH was obtained and dried for 12 hours at 80°C. Dealuminated zeolites were then characterized by XRD, FTIR and Si/Al ratio measurements. Dealuminated zeolite was then used to adsorb indigo carmine in a batch-shaker system for 30 min with concentration variation XRD diffraction shows that natural zeolite and dealuminated zeolite contain modernit minerals. Dealumination increased the Si/Al ratio from 0.935 to 2.075 and 7.912 which meant that dealumination was successful. The indigo carmine adsorption result showed that zeolite adsorption capacity II> zeolite I> natural zeolite. FTIR data showed that there was no change of zeolite structure before and after adsorption

Evaluasi Model Langmuir-Hinshelwood untuk Kinetika Adsorpsi Besi(III) pada 2-Merkaptobenzotiazol-Zeolit Alam Sriyanti Sriyanti; Taslimah Taslimah
Jurnal Kimia Sains dan Aplikasi Vol 7, No 2 (2004): Volume 7 Issue 2 Year 2004
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Telah dibuat adsorben dengan mengimpregnasikan 2-merkaptobenzotiazol pada padatan pendukung zeolit alam yang sebelumnya telah dilapisi polistirena. Adsorben yang dihasilkan selanjutnya digunakan untuk mengadsorpsi besi (III) dalam medium air. Sebelum impregnasi zeolit diberi perlakuan fisikokimia, meliputi pemanasan 80 0C dalam campuran KMnO4 dengan H2SO4; KMnO4 dengan HCl dan KMnO4 dengan H2SO4, dilanjutkan dengan HCl. Kajian kinetika dilakukan dengan variasi waktu kontak terhadap banyaknya besi (III) yang teradsorpsi menggunakan metode batch. Model kinetika Langmuir-Hinshelwood digunakan untuk mengesti-masi besarnya konstanta laju, dan perubahan energi bebas adsorpsi. Sebagai evaluasi digunakan model kinetika adsorpsi melalui dua proses, cepat dan lambat. Hasil penelitian menunjukkan bahwa perlakuan awal KMnO4-H2SO4-HCl pada zeolit alam dapat dinyatakan sebagai cara paling efektif untuk menurunkan aluminium (dealu-minasi). Data adsorpsi ion besi (III) pada adsorben yang dibuat dari zeolit alam dengan perlakuan awal tersebut menunjukkan besi (III) teradsorpsi paling lambat baik dengan model Langmuir-Hinshelwood (k1=0,39x10-2 menit-1) maupun model adsorpsi dua proses (laju cepat (kc)= 3,66x10-2 menit-1, laju lambat (kl)= 0,106 menit-1). Dari data energi bebas, besi(III) teradsorpsi secara fisik.

Co-Authors Adi Darmawan Damar Nurwahyu Bima Kumala Devi Nanik Sulistyowati Suhartana Suhartana Taslimah Taslimah Taslimah Taslimah Tiska Eva Triandhani

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