黏土基陶粒吸附处理Cd2+废水

摘要

以黏土为骨料制备多孔陶粒,研究了该陶粒对Cd<'2+>的吸附能力、吸附动力学和吸附机理.结果表明,黏土基陶粒对Cd<'2+>具有良好的吸附能力;陶粒对Cd<'2+>的吸附符合准二级吸附速率方程,颗粒内扩散模型确定吸附过程由2个或多个步骤控制;陶粒中-OH、C-O基团参与了对Cd<'2+>的吸附,形成了CdO新相,说明陶粒对Cd<'2+>的吸附包括化学吸附.%The porous ceramsite has been prepared by using lay as aggregate. The Cd2+ adsorption capacity of ceramsite, the adsorption kinetics and adsorption mechanism are investigated. The results show that the clay-based ceramsite has excellent Cd2+ adsorption capacity. The adsorption kinetic model shows that the Cd2+ adsorption capacity of ceramsite agrees with quasi-two adsorption rate equation. The intrapartical confusion model determines that the adsorption process is controlled by two or more procedures. The-OH and C-O groups of the ceramsite participate in Cd2+ adsorption and form kainotype CdO, indicating that the Cd2+ adsorption of ceramsite includes chemical adsorption.