Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University, Indonesia
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@article{JKSA17619, author = {Sintya Pramesti and Khabibi Khabibi and Nor Basid Prasetya}, title = {Pemanfaatan Kitosan Termodifikasi Asam Askorbat sebagai Adsorben Ion Logam Besi(III) dan Kromium(III)}, journal = {Jurnal Kimia Sains dan Aplikasi}, volume = {15}, number = {2}, year = {2012}, keywords = {Kitosan; asam askorbat; adsorpsi; besi (III); krom(III)}, abstract = {Penelitian pemanfaatan kitosan termodifikasi asam askorbat sebagai adsorben ion logam berat, yaitu besi (III) dan kromium (III) telah dilakukan. Tujuan penelitian ini adalah memperoleh kitosan termodifikasi asam askorbat, menentukan pH optimum adsorpsi ion Fe(III) dan Cr(III) oleh kitosan termodifikasi asam askorbat dengan variasi pH adsorpsi, serta menentukan kapasitas adsorpsi maksimum kitosan termodifikasi asam askorbat terhadap ion logam Fe(III) dan Cr(III). Derajat deasetilasi kitosan diperoleh menggunakan FTIR. Berat molekul kitosan dihitung menggunakan persamaan Mark-Houwink. Uji kelarutan kitosan dilakukan menggunakan CH 3 COOH, HNO 3 dan HCl. Morfologi permukaan kitosan dikarakterisasi dengan SEM. Adsorpsi ion logam Fe (III) dan Cr (III) dilakukan dalam larutan pH 2-6 dengan melakukan variasi konsentrasi ion logam adalah 50; 100; 150; 200 dan 250 ppm. Ion logam Fe(III) dan Cr (III) 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 39966,85 g/mol. Hasil uji kelarutan terhadap kitosan termodifikasi asam askorbat menggunakan asam-asam encer seperti CH 3 COOH, HNO 3 dan HCl menunjukkan kitosan termodifikasi asam askorbat relatif tidak larut terhadap asam-asam encer dibandingkan dengan kitosan beads. Morfologi permukaan kitosan termodifikasi asam askorbat menunjukkan adanya pori yang menyebar dan tidak beraturan. pH optimum adsorpsi untuk ion logam Fe(III) pada pH 4 dan ion logam Cr(III) pada pH 3. Kapasitas adsorpsi maksimum Fe(III) sebesar 12,658 mg/g dan 13,157 mg/g untuk logam Cr(III)}, issn = {2597-9914}, pages = {70--75} doi = {10.14710/jksa.15.2.70-75}, url = {https://ejournal.undip.ac.id/index.php/ksa/article/view/17619} }
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