Abstract
本文以铝盐、铁盐为原料，对牡蛎壳进行改性，研究了改性牡蛎壳吸附除磷性能。实验表明，改性牡蛎壳吸附除磷过程符合Langmuir等温吸附方程，其吸附动力学与准二级方程拟合最佳。改性牡蛎壳对磷的理论饱和吸附量为20~30 mg P (以 计)/g吸附剂，是未改性的5倍左右。通过KCl-NaOH-HCl逐级浸提法分析得知，吸附饱和后吸附剂中磷以钙磷结合、铝磷结合或铁磷结合形态存在。改性牡蛎壳对模拟含磷废水除磷率在90%以上，天然牡蛎壳只有41%。 The oyster shell was modified through ferric salt and aluminum salt, and the performance of modified oyster shell for phosphorus removal was examined. Results indicated that the adsorption processes of phosphorus by modified oyster shell were in conformity with Langmuir isothermal adsorption equation, while the relevant adsorption followed the second-order kinetic equation. The theoretical saturated adsorption capacity of the modified oyster shell was 20 - 30 mg P ( )/g, which was 5-folds higher than that of original oyster shell. Analysis of KCl-NaOH-HCl sequential extraction showed that the phosphorus speciation in saturated adsorbents was in the form of Ca-bound P, Al-bound P or Fe-bound P. More than 90% of phosphorus was removed with modified oyster shell from artificial wastewater, whereas only 41% was removed with original oyster shell.
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