Friedel层状化合物对正磷酸根的去除效应及其作用机制

Removal and mechanism of phosphate by Friedel phase

为了解Friedel化合物除磷的应用潜能,研究了Friedel化合物对正磷酸根的吸附动力学和吸附等温线,并结合反应后溶液中各离子浓度的变化和反应固相产物的XRD、红外光谱分析,探讨其除磷作用机理.结果表明:Friedel化合物对正磷酸根的吸附等温线符合Langmuir等温吸附方程,理论吸附容量为4.86mmol·g-1;Friedel化合物除磷作用机理主要为溶出钙离子的沉淀作用,同时存在氢氧化铝的固磷作用.

In order to understand the application potential of Friedel phase for phosphate removal,the adsorption behaviors of Friedel phase for phosphate from aqueous solution were examined by adsorption kinetic and isotherm adsorption.The results indicated that Friedel phase had a stong fixation capacity on phosphate.The adsorption isotherm data were well fitted with the Langmuir equation and the maximum adsorption amount of phosphate was 4.86 mmol · g^-1.The main removal mechanism of Friedel phase on phosphate was precipitation,with hydroxyapatite as a product,and the aluminum hydroxide strengthened the removal of phosphate.