Department of Chemistry, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Indonesia
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@article{JKSA27655, author = {Bambang Rusdiarso and Rahmat Basuki}, title = {Stability Improvement of Humic Acid as Sorbent through Magnetite and Chitin Modification}, journal = {Jurnal Kimia Sains dan Aplikasi}, volume = {23}, number = {5}, year = {2020}, keywords = {HA stabilization; HA modification; magnetite/HA-chitin; Hg(II)}, abstract = {Stability improvement of humic acid (HA) through modification of HA by chitin (HA-chitin) followed by a coating of HA-chitin on magnetite has been successfully performed. The coated magnetite (magnetite/HA-chitin) was conducted by the co-precipitation method, and the synthesized magnetite/HA-chitin was characterized by FT-IR, XRD, SEM-EDX, and VSM. The successful coated-magnetite by HA-chitin was proved by the appearance of a new band at 1627 cm -1 (FT-IR), the formation of a crystalline phase with characteristic 2θ of magnetite: 30.259° [220]; 35.64° [311]; 42.590° [400]; 57.280° [511]; and 62.896° [440] (XRD), an increasing of carbon content in magnetite/HA-chitin (SEM-EDX), and the ease of magnetite/HA-chitin being attracted to external magnetic fields with magnetic saturation strength 29.3 emu/g (VSM). Stability tests at pH 2.0 - 10.0 prove that magnetite/HA-chitin remains stable as a solid sorbent on average above 80%. Its application to Hg (II) sorption occurred optimum at pH 7.0, where 75.89% Hg (II) is sorbed on 0.1 g of sorbent and agreed well to the pseudo-second-order kinetics model of Ho.}, issn = {2597-9914}, pages = {152--159} doi = {10.14710/jksa.23.5.152-159}, url = {https://ejournal.undip.ac.id/index.php/ksa/article/view/27655} }
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