高锰酸钾改性蛋壳对水中磷的吸附特性研究

Absorption of Phosphorus in Water by Potassium Permanganate Modified Eggshell

以不同浓度高锰酸钾溶液制备改性蛋壳PPME1、PPME2、PPME3,探究其对水中磷的吸附性能.结果表明:改性后蛋壳的比表面积、孔径和孔体积分别增加了8~15倍、1.7~3.3倍、1.3~1.5倍.吸附平衡时间为90 min,朗格缪尔等温方程(R^2>0.96)和准二级动力学方程(R^2>0.99)较好地描述了改性蛋壳对PO34-P的吸附,PPME1、PPME2、PPME3对PO3^4-P的吸附容量分别为4.25,4.27,4.25 mg·g^-1.当含磷溶液初始pH值为2,蛋壳吸附剂投加量为6 g·L^-1时,吸附效果最佳;高锰酸钾溶液改性蛋壳对水中PO34-P的吸附速率增大,吸附量无明显差异.

PPME1,PPME2 and PPME3 of modified eggshell have been prepared with potassium permanganate solution of different concentrations to investigate their absorption properties for phosphorus in water.The results show that the specific surface area,pore diameter and pore volume of modified eggshell increased by 8~15 times、1.7~3.3 times and 1.3~1.5 times respectively.The absorption equilibrium time is 90 min,and the langmuir isothermal equation(R^2>0.96)and quasi-secondorder kinetic equation(R^2>0.99)well describe the absorption capacity of modified eggshell on PO34-P.The absorption capacities of PPME1,PPME2 and PPME3 on PO34-P are 4.25,4.27,4.25 mg·g^-1 respectively.When the initial pH value of phosphorus solution is 2 and the dosage of absorbent for eggshell is 6 g·L^-1,the absorption effect is the best.The absorption rate of PO3^4-P increases with potassium permanganate solution,but there is no significant difference in the absorption capacity.