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All Journal ACTA VETERINARIA INDONESIANA JMPM (Jurnal Material dan Proses Manufaktur) Makara Journal of Science
Kiagus Dahlan
Department of Physics, Faculty of Mathematics and Natural Sciences, Bogor Agricultural University
Engineering Mechanical Engineering Veterinary

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Journal : Makara Journal of Science

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Adsorption of Waste Metal Cr(VI) with Composite Membranes (Chitosan-Silica Rice Husks) Zulti, Fifia; Dahlan, Kiagus; Sugita, Purwantiningsih
Makara Journal of Science Vol. 16, No. 3
Publisher : UI Scholars Hub

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Chromium compounds are widely used in modern industry. Many of these compounds are dumped into the surrounding environment. Membrane technology is more efficient and effective than conventional methods for waste treatment. The research objective was to make a membrane separation process that can be applied to Cr(VI). Membranes were made from chitosan and silica rice husks. Variations of chitosan and silica rice husk used (g) are 2:1 (A1), 2:2 (A2), 3:1 (B1), and 3:2 (B2). The membrane was made by using an inverted phase technique. Results of SEM characterization of membranes showed that B2 has the largest pores at 2.58 μm. The FTIR characterization results indicate the presence of crosslinking between chitosan with silica rice husk with the appearance of Si-O adsorption band at wavelength 1122- 980/cm. A1 membrane, with the smallest pore size has the greatest rejection value towards Cr(VI) which is 70%. The result of this research showed that the composite membrane of silica rice husk was effective enough to adsorb metal Cr(VI) with an average adsorption capacity of 1665.85 mg/g.
APPLICATION OF HYDROXYAPATITE IN PROTEIN PURIFICATION Yusuf, Permai Sari Molyana; Dahlan, Kiagus; Witarto, Arief Budi
Makara Journal of Science Vol. 13, No. 2
Publisher : UI Scholars Hub

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The precursors, Na2HPO4.2H2O and CaCl2.2H2O are used for synthesizing pure hydroxyapatite which less of carbonate content. The high temperature of sintering, about 700o C of temperature, is treated to minimize the carbonate group on hydroxyapatite surface. Carbonate content of hydroxyapatite which is sintered in 700o C is less than 110o C. It indicates an increasing temperature of sintering will increase crystallinity and decrease carbonate content of hydroxapatite. This method gave better way to resulting hydroxyapatite crystal. The patterns of band of SDS PAGE in resulting of Protein Purification by DEAE matrix is also appear in using hydroxyapatite matrix. The other band also appear in purification by hydroxyapatite matrix, it showed that hydroxyapatite not only has DEAE matrix characteristic as anion exchange but also has kation exchange characteristic. These patterns proof that hydroxyapatite could be used in protein purification as matrix as cation an anion exchange. Additionally, apatite matrix is abiding and can be used repeatedly more than one hundred times without contamination.
Co-Authors Afifa, Selma Akhiruddin Maddu Angesti, Shavrillia Arief Budi Witarto Gunanti . Purwantiningsih Sugita Raden Roro Soesatyoratih Ramadian, Nuzula Ravi, Sugganya Tarigan, Putri Andayati Br Yusuf, Permai Sari Molyana Zulti, Fifia