Synthesis of Fulvic Acid-Coated Magnetite (Fe 3 O 4 –FA) and Its Application for the Reductive Adsorption of [AuCl 4 ] –

Philip Anggo Krisbiantoro; Sri Juari Santosa; Eko Sri Kunarti

doi:10.22146/ijc.24828

Synthesis of Fulvic Acid-Coated Magnetite (Fe₃O₄–FA) and Its Application for the Reductive Adsorption of [AuCl₄]^–

https://doi.org/10.22146/ijc.24828

Philip Anggo Krisbiantoro⁽¹⁾, Sri Juari Santosa^(2*), Eko Sri Kunarti⁽³⁾

(1) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, Yogyakarta 55281, Indonesia
(2) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, Yogyakarta 55281, Indonesia
(3) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, Yogyakarta 55281, Indonesia
(*) Corresponding Author

Abstract

Fulvic acid-coated magnetite (Fe₃O₄–FA) has been synthesized through coprecipitation method using NH₄OH. Synthesis conducted by cheap and environmentally friendly preparation used iron salts and extracted fulvic acid (FA) from Peat soil of Rawa Pening, Central Java, Indonesia. Characterization using FT–IR indicated that the coating of FA on Fe₃O₄ occurred through the formation of chemical bond between iron of Fe₃O₄ and carboxyl group of FA. The XRD measurement indicated that coated Fe₃O₄ successfully dispersed in smaller size than uncoated Fe₃O₄, i.e. from 16.67 to 14.84 nm for Fe₃O₄ and Fe₃O₄–FA, respectively. Synthesized Fe₃O₄–FA has pH_PZC 6.37 and stable at pH > 3.0. The extracted FA has total acidity 866.61 cmol kg^–1, –COOH content 229.77 cmol kg^–1 and –OH content 636.84 cmol kg^–1. Fe₃O₄–FA has total acidity 494.86 cmol kg^–1, –COOH content 67.80 cmol kg^–1 and –OH content 427.06 cmol kg^–1. The adsorption rate constant (k) of [AuCl₄]^– on Fe₃O₄–A according to the Ho kinetic model was 8006.53 g mol^–1 min^–1. The adsorption capacity (q_max) according to Langmuir isotherm model was 1.24 × 10^–4 mol g^–1. The presence of reduction towards the adsorbed [AuCl₄]^– was shown by the appearance of peaks at 2θ: 37.41; 43.66; 64.25, and 76.67° in the XRD diffractogram.

Keywords

magnetite; fulvic acid; gold, adsorption; reduction

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References

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DOI: https://doi.org/10.22146/ijc.24828

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