pH对Cd^(2+)离子在δ-MnO_2上的吸附与解吸的影响  

Effect of pH Value on Adsorption and Desorption of Cd^(2+) at δ-MnO_2

作　　者：梁慧锋[1] 张孟存[2] 

机构地区：[1]邢台学院化学系,河北邢台054001 [2]邢台职业技术学院资源与环境工程系,河北邢台054035

出　　处：《环境科学与技术》2009年第4期19-23,共5页Environmental Science & Technology

基　　金：国家自然科学基金项目资助(20477009);河北省自然科学基金项目(E2005000183)

摘　　要：研究了pH值对δ-MnO2对模拟废水中Cd2+的吸附作用的影响,当pH<2.3时,吸附率仅为20%,pH>5时Cd2+的吸附率在96%以上;吸附过程为非特性吸附,可以用Elovich方程和双速率方程来描述。吸附后δ-MnO2在pH<2.05时可以有效的解吸,解吸率约为75%。Effect of pH value was studied for adsorption capability of Cd2. with δ-MnO2. Results indicated that the adsorption strongly relied on pH value. When pH value was below 2.3, adsorption rate of Cd2＋ was only 20% while pH value was above 5, adsorption percentages of Cd2＋ was above 96%. Sorption kinetics of δ-MnO2 for Cd （Ⅱ） ion was investigated. The data of kinetic experiments were described well with the Elovicb equation and double rate equafion.δ-MnO2 may be effectively desorbed after adsorption Cd2＋ at the pH values below 2.05, with desorption rates about 75%.

关 键 词：Δ-MNO2 非特性吸附 Elovich方程 双速率方程 

分 类 号：X132[环境科学与工程—环境科学]