Korean Journal of Chemical Engineering, Vol.36, No.5, 753-762, 2019
Preparation of mesoporous silica from coal slag and its metal ion adsorption behavior
A novel mesoporous silica (MS) with the high specific surface area up to 1,199m2/g was prepared from coal slag by SO3 2 - leaching and hydrothermal synthesis. Its application in metal ion removal was explored using Pb2+, Cu2+, Co2+ and Cd2+ as the model ions. The effects of adsorption time, pH, initial metal ion concentration, adsorbent dosage and adsorption temperature on the metal ion adsorption behaviors of the as-prepared MS were systematically, and the maximum adsorption capacities were measured to be 55.76mg·g-1, 33.49mg·g-1, 24.29mg·g-1 and 22.98mg· g-1 for Pb2+, Cu2+, Co2+ and Cd2+, respectively. The metal ion adsorption on the as-prepared MS followed pseudo-second- order kinetics, and the adsorption isotherm fitted the Langmuir isotherm model, indicating that the adsorption was spontaneous, endothermic and enthalpy driven.
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[Cited By]
Garba ZN, Xiao W, Zhou W, Lawan I, Jiang Y, Zhang M, Yuan Z, Korean Journal of Chemical Engineering , 36 (11), 1826, 2019
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