Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University, Jl. Prof. Soedarto, SH., Tembalang, Semarang, Indonesia
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@article{JKSA17416, author = {Ita Khamidah and Muhammad Djunaidi and Khabibi Khabibi}, title = {Pemanfaatan Kitosan Termodifikasi Asam Askorbat Sebagai Adsorben Ion Logam Kobalt (II) dan Nikel (II)}, journal = {Jurnal Kimia Sains dan Aplikasi}, volume = {14}, number = {1}, year = {2011}, keywords = {Kitosan; Asam Askorbat; Adsorpsi; Kobalt (II); Nikel(II); Isotherm Langmuir}, abstract = {Telah dilakukan penelitian tentang pemanfaatan kitosan termodifikasi asam askorbat sebagai adsorben ion logam Co(II) dan Ni(II). Tujuan penelitian ini adalah membuat kitosan termodifikasi asam askorbat, menentukan pH optimum dan kapasitas adsorpsi maksimum untuk adsorpsi ion Co(II) dan Ni(II) oleh kitosan termodifikasi asam askorbat. Penentuan derajat deasetilasi dilakukan menggunakan spektrofotometer FTIR. Penentuan berat molekul dilakukan menggunakan viskometer ubblohde. Uji kelarutan kitosan termodifikasi dengan kitosan butir sebagai pembanding dilakukan menggunakan larutan asam-asam encer seperti CH 3 COOH, HCl, HNO 3 . Sedangkan analisis morfologi permukaan kitosan termodifikasi dan kitosan butiran dilakukan dengan Scanning Electron Microscopy (SEM). Adsorpsi ion logam Co(II) dan Ni(II) dilakukan pada variasi pH 2-6 dan variasi konsentrasi larutan 90; 120; 150; 180; 210 ppm. Ion logam Co(II) dan Ni(II) yang tidak terserap, dianalisis dengan SSA. Penentuan kapasitas adsorpsi maksimum dilakukan dengan menggunakan persamaan isotherm Langmuir. Dari data penelitian diperoleh derajat deasetilasi kitosan adalah 64,74% dan berat molekul sebesar 39.966,85 g/mol. Hasil uji kelarutan menunjukkan kitosan termodifikasi asam askorbat relatif tidak larut terhadap asam-asam encer dibandingkan dengan kitosan butiran. Morfologi permukaan kitosan termodifikasi menunjukkan adanya pori yang menyebar dan tidak beraturan sehingga dapat digunakan sebagai adsorben. pH optimum adsorpsi ion logam Co(II) dan Ni(II) adalah pH 4. Kapasitas adsorpsi maksimum ion Co(II) sebesar 11,364 mg/g dan ion Ni(II) sebesar 5,988 mg/g.}, issn = {2597-9914}, pages = {21--25} doi = {10.14710/jksa.14.1.21-25}, url = {https://ejournal.undip.ac.id/index.php/ksa/article/view/17416} }
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