Synthesis and utilization of Mg/Al hydrotalcite for removing dissolved humic acid |
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| Authors: | Sri Juari Santosa Eko Sri Kunarti |
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| Institution: | a Department of Chemistry, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Sekip Utara Kotak Pos Bls. 21, Bulaksumur, Yogyakarta, Indonesia
b Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan |
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| Abstract: | It has been synthesized Mg/Al layered double hydroxide anionic clay (Mg/Al hydrotalcite) through direct precipitation by adding 0.5 M NaOH solution into a mixed solution containing Mg(NO3)2 and Al(NO3)3 with molar ratio of 0.1:0.05 until the medium acidity reached pH 10.1. The synthesized Mg/Al hydrotalcite was then utilized to remove dissolved humic acid in aqueous medium. The humic acid was isolated from peat soil taken in Gambut District, South Kalimantan, Indonesia using the recommended procedure of IHSS (International Humic Substances Society). The removal of humic acid was mostly occurred through simple sorption process without accompanied by significant intercalation. The sorption was optimum at pH 9.0, with the first order rate constant, capacity and energy of sorption were 5.50 × 10−3 min−1, 0.12 mmol g−1 (69 mg g−1), and 28.32 kJ mol−1, respectively. |
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| Keywords: | 61 10 Nz 61 18 &minus j 61 25 Hq |
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