Abstract

LEE, Taeyoon. Accelerated phosphorus removal using sulfate-coated expanded vermiculite. Water SA [online]. 2020, vol.46, n.4, pp.615-626. ISSN 1816-7950.  http://dx.doi.org/10.17159/wsa/2020.v46.i4.9075.

This study evaluated whether phosphorus in an aqueous solution can be effectively adsorbed and removed by sulfuric acid (SA)-coated vermiculite (SCV), which was synthetized by heating a mixture of expanded vermiculite (EV) and SA at 300°C. Phosphorus was removed from the aqueous solution and removal characteristics were evaluated by batch kinetic, batch adsorption, and column tests. The phosphate removal rates (h^-1) for 1, 2.5, 5, 7.5, 12.5, and 25 g-L^-1 of SCV were 0.00015, 0.0011, 0.0044, 0.0087, 0.0648, and 0.5002, respectively. The Q_max of the Langmuir model and the partition coefficients of the linear and Freundlich models were 8.92 mg-g^-1, 0.65 L-g^-1, and 4.60 L-g^-1 (1/n = 0.354), respectively. The equilibrium phosphorus adsorptions (q_e) were 7.47, 14.69, and 19.53 mg-g¹ at initial concentrations of 10, 25, and 50 mg-L^-1, respectively. These results show that SCV can efficiently adsorb phosphorus in an aqueous solution.

Keywords : vermiculite; sulfuric acid; floating adsorbent; adsorption; exfoliation; phosphorus.

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