铁盐改性废弃蛋壳对水中磷的吸附特征研究

Phosphorus adsorption behaviors on iron-coated wasted eggshell in aqueous solution

采用铁盐对废弃蛋壳进行化学改性,并研究改性蛋壳对水中磷的吸附特征.结果表明,改性蛋壳明显提高磷的吸附能力,磷在改性蛋壳中的吸附是一吸热过程,其吸附等温线符合Freundlich方程,磷在改性蛋壳中的吸附历时曲线遵循准二级反应动力学模型.溶液pH值显著影响磷在改性蛋壳中的吸附效果,当pH3时,改性蛋壳对磷具有吸附最大值.

Modification of wasted eggshell using ferric salt and phosphorus adsorption behaviors on the iron-coated eggshell are investigated.The results show that phosphorus adsorption capacity can be markedly improved on iron-coated eggshell compared to that on eggshell without modification.Phosphorus adsorption on iron-coated eggshell is an endothermal process,and its adsorption isotherms can be well described by Freundlich equation.The time-resolved curves of phosphorus adsorption on iron-coated eggshell follows pseudo-second-order kinetic model.In addition,solution initial pH values have a significant effect on phosphorus adsorption.the maximum phosphorus adsorption amount on iron-coated eggshell can be achieved at pH value of 3.