Adsorption of phosphate from the Yellow River water by desert particles:Kinetics and equilibrium studies  

作　　者：BeiGang Li XiaoLing Bai Qin Ma 

机构地区：[1]College of Chemical&Environmental Science,Inner Mongolia Normal University,Hohhot,Inner Mongolia 010022,China

出　　处：《Research in Cold and Arid Regions》2012年第3期236-241,共6页寒旱区科学（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 20467002);the Natural Science Foundation of Inner Mongolia Autonomous Region(200711020214)

摘　　要：The equilibrium and kinetic adsorption of phosphate （P） from the Yellow River water onto desert particles taken from the Ulan Buh and Kubuqi deserts were investigated. Effect of the initial concentration of P and particulate matter on the sorption was ex- plored. The kinetic studies show that adsorption rate was faster within the 0-8th hour period, then gradually decreased at 8th-48th hour period and basically tended to a dynamic equilibrium at the 48th hour, but there exists an adsorption difference of P onto dif- ferent desert particles. The uptake process of P followed the pseudo-second-order rate model and the Morris-Weber diffusion equation which indicates that the adsorption process was mainly controlled by P diffusion inside the particles. The equilibrium in- vestigation obtained an adsorption-desorption equilibrium mass concentration （EPCo） of P from the Yellow River water on desert particles with the range of 0.010-0.042 mg/L, which is higher than present P concentration in the Yellow River. This study indi- cates that desert particles entering the river might release P to the Yellow River.The equilibrium and kinetic adsorption of phosphate （P） from the Yellow River water onto desert particles taken from the Ulan Buh and Kubuqi deserts were investigated. Effect of the initial concentration of P and particulate matter on the sorption was ex- plored. The kinetic studies show that adsorption rate was faster within the 0-8th hour period, then gradually decreased at 8th-48th hour period and basically tended to a dynamic equilibrium at the 48th hour, but there exists an adsorption difference of P onto dif- ferent desert particles. The uptake process of P followed the pseudo-second-order rate model and the Morris-Weber diffusion equation which indicates that the adsorption process was mainly controlled by P diffusion inside the particles. The equilibrium in- vestigation obtained an adsorption-desorption equilibrium mass concentration （EPCo） of P from the Yellow River water on desert particles with the range of 0.010-0.042 mg/L, which is higher than present P concentration in the Yellow River. This study indi- cates that desert particles entering the river might release P to the Yellow River.

关 键 词：ADSORPTION desert particles PHOSPHATE Yellow River 

分 类 号：TQ126.35[化学工程—无机化工] S725.72[农业科学—林木遗传育种]