Retno Ariadi Lusiana
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Diponegoro, Semarang 50275

Published : 11 Documents
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Penambahan EDTA sebagai Inhibitor pada Laju Korosi Logam Tembaga Nuryanto, Rahmad; Lusiana, Retno Ariadi; Khabibi, Khabibi
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

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Abstract

Telah dilakukan penelitian tentang pengaruh penambahan agen chelat EDTA untuk menghambat laju korosi pada logam tembaga. Penelitian ini menggunakan metoda penentuan korosi melalui pengukuran resistansi logam, di mana kenaikan resistansi pada logam tersebut menandai bahwa logam yang terkorosi semakin meningkat. Pengukuran korosi dilakukan terhadap kawat tembaga dan kawat tembaga yang dichelat dengan media pengkorosi H2SO4 1M. Hasil penelitian terhadap kawat tembaga dengan panjang 3 m dan diameter 0,5 mm yang dichelat dengan EDTA 1 M menunjukkan penurunan korosi sebesar 20,6%Kata kunci: inhibitor, korosi, EDTA, tembaga
THE INFLUENCE OF PVA.cl.CITRIC ACID/CHITOSAN MEMBRANE HYDROPHICILITY ON THE TRANSPORT OF CREATININE AND UREA Lusiana, Retno Ariadi; Siswanta, Dwi; Mudasir, Mudasir; Hayashita, Takashi
Indonesian Journal of Chemistry Vol 13, No 3 (2013)
Publisher : Universitas Gadjah Mada

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The influence of cross-linking and membrane hydrophilicity on the transport rate had been studied using a membrane prepared from a mixture of chitosan/PVA cross-linked citric acid (PVA.cl.CA) for creatinine and urea transport. The optimum mole ratio of PVA:citric acid as well as the best composition of chitosan:PVA.cl.CA were determined using creatinine transport study. Using the optimum compositions, further study was done using different thickness of the membrane in transporting creatinine, urea and a mixture of 3 species (creatinine, urea and vitamin B12). Membrane characterization was done using FT-IR spectrophotometer, water absorption test, TG/DTG and SEM. The results showed that the optimum composition PVA:citric acid was obtained to be 90:1, having % WU of 113.74% and creatinine transport percentage of 18.16%. Meanwhile, the optimum composition of chitosan:PVA.cl.CA was found at 4:6 ratio having % WU and % transport of 136.67% and 24.26%, respectively. The optimum transport capacity was found for membrane thickness of 50 µm with WU% at 139.61% and the percent transport of creatinine and urea each was 38.93% and 60.36%. The presence vitamin B12 in the solution of is proved to disturb the transport of creatinine and urea through the membrane. Finally, hydrophilicity seemed to give substantial contribution in the transport process as well as the mechanical strength of the membrane.
Preparation of Citric Acid Crosslinked Chitosan/Poly(Vinyl Alcohol) Blend Membranes for Creatinine Transport Lusiana, Retno Ariadi; Siswanta, Dwi; Mudasir, Mudasir
Indonesian Journal of Chemistry Vol 16, No 2 (2016)
Publisher : Universitas Gadjah Mada

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Abstract

Preparation of membrane using crosslinking reaction between chitosan and citric acid showed that functional group modification increased the number of active carrier groups which lead to better transport capacity of the membrane. In addition, the substitution of the carboxyl group increased creatinine permeation of chitosan membrane. The transport capacity of citric acid crosslinked chitosan membrane for creatinine was found to be 6.3 mg/L. The presence of cyanocobalamin slightly hindered the transport of creatinine although compounds did not able to pass through citric acid crosslinked chitosan/poly(vinyl alcohol) blend membrane, as compounds no found in the acceptor phase.
Sintesis Oktileugeniloksi Etanoat dari Eugenol Lusiana, Retno Ariadi; Siswanta, Dwi
Jurnal Kimia Sains dan Aplikasi Vol 6, No 1 (2003): Volume 6 Issue 1 Year 2003
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

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Telah disintesis senyawa ester oktil eugeniloksi etanoat dari bahan dasar eugenol dengan metode Furnish. Analisisstruktur dilakukan secarafisiko-kimia, seperti kromatografi gas, 1H-NMR, infra merah dan GC-MS. Hasilyang diperolehmenunjukkan bahwa senyawa oktil eugeniloksi etanoat berhasil didapatkan melalui reaksi esterifikasi
Pengaruh Agen Pencangkok Heparin terhadap Kemampuan Transpor Kreatinin dan Urea Membran Turunan Kitosan Al Baani, Fathur; Lusiana, Retno Ariadi; Djunaidi, Muhammad Cholid
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

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Immersi heparin dilakukan pada membran kitosan untuk menambah sisi aktif membran, pada proses transpor urea. Dari data analisis didapatkan terjadi peningkatan persentase transpor urea dari 17,57 % menjadi 27,09 % dengan adanya penambahan heparin.
Pemanfaatan Oktil Eugeniloksi Etanoat Hasil Sintesis sebagai Plasticizer Membran Polimer Cair Elektroda Selektif Ion Lusiana, Retno Ariadi; Siswanta, Dwi
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

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Abstract

Dua plasticizer, dibenzil eter  (DBE) dan oktil eugeniloksi etanoat (OEE) dipelajari untuk mengetahui kemampuannya dalam membran polimer ESI (Elektroda Selektif Ion) perklorat dengan senyawa aktif  TOMA-Cl (tetra oktil metil amonium klorida). Hasil penelitian menunjukkan dari hasil pengukuran terhadap karakteristik ESI perklorat didapatkan bahwa penggunaan DBE memberikan hasil yang lebih baik dibandingkan dengan OEE sebagai plasticizer.  Secara umum, interaksi yang terjadi antara fasa membran dengan anion mengikuti kaedah seri Hofmeister.
Chitosan succinate/PVA-PEG Membrane: Preparation, Characterization and Permeation Ability Test on Creatinine Lusiana, Retno Ariadi; Sangkota, Vivi Dia Ahmad; Santosa, Sri Juari
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

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Abstract

Evaluation character of chitosan membrane-succinate / poly vinyl alcohol-poly ethylene glycol (PVA-PEG) were prepared in acetic acid solvent through a phase inversion method has been performed. The study began with the preparation of crosslinked chitosan compounds with succinic acid, followed by preparation into membrane by combining PVA-PEG. Character analysis of the resulting material using FTIR, EDX, TGA, water absorption test, tensile strength, membrane hydrophilicity. The ability of membrane permeation was tested against creatinine. The results showed that the succinate had reacted with chitosan. Chitosan modification through cross link and polymer alloys increases tensile strength and membrane strain of 1.7-2.5 x of pure chitosan membrane. In addition, the modified membrane also has higher water absorption and hydrophilicity values than the unmodified membrane, and this implies the ability of membrane-induced creatinine permeation. Permeable permeation values were 13.8% in chitosan, 24.84% on chitosan-succinate and 25% in chitosan-succinate / PVA-PEG. Chitosan-succinate membranes have the ability to use more than 4x repeated use.
Decolorization of Remazol Black B Solution by PbO2 Modified Fenton Method in a Scaled Up Reactor Hasibuan, Muhamad Abduh; Widodo, Didik Setiyo; Lusiana, Retno Ariadi
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

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Abstract

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.
Pemanfaatan Karbon Aktif Serbuk Gergaji Kayu Jati untuk Menurunkan Chemical Oxygen Demand (COD) Limbah Cair Industri Tekstil Akhsanti, Ratu Yulia; Lusiana, Retno Ariadi; Khabibi, Khabibi
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

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Abstract

Pada penelitian ini dikaji penggunaan karbon aktif dari serbuk gergaji kayu jati dengan zat pengaktifasi berupa larutan NaCl untuk menurunkan COD limbah cair industri tekstil. Hasil penelitian menunjukkan bahwa karbon aktif dari serbuk gergaji kayu jati memiliki kadar abu 1,05% dan kadar air 3,82%. Spektra FTIR menunjukkan adanya gugus fungsi berupa gugus hidroksil sementara dari analisis SEM, diperoleh ukuran pori karbon aktif dengan diameter 0,468 µm dan panjang 0,489 µm. Pada waktu adsorpsi 110 menit terjadi penurunan kadar COD sebesar 86% dan pada berat adsorben 1,15 gram terjadi penurunan kadar COD sebesar 84% dari kadar COD awal limbah industri tekstil sebesar 1291,53 mg/L.
Grafting of Heparin on Blend Membrane of Citric Acid Crosslinked Chitosan/Polyethylene Glycol-Poly Vinyl Alcohol (PVA-PEG) Lusiana, Retno Ariadi; Pambudi, Ginanjar Argo; Sari, Fitra Nilla; Widodo, Didik Setiyo; Khabibi, Khabibi; Isdadiyanto, Sri
Indonesian Journal of Chemistry Vol 19, No 1 (2019)
Publisher : Universitas Gadjah Mada

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Abstract

Heparin, an active sulfate group material, grafted onto blend membrane citric acid cross-linked chitosan/poly (vinyl alcohol)-poly(ethylene glycol) (PVA-PEG) to improve the membrane properties. The physical tests shown that grafting reaction of citric acid crosslinked chitosan increased the mechanical strength and membrane swelling. The permeability test results, it was found that the grafted chitosan membrane was improved permeability of both urea and creatinine as compared to chitosan pure and chitosan crosslinked membrane. The negative charge of the sulphonate group of heparin increased the number of the active side of the carrier in the membrane, which then correlated to the membrane’s permeability process.