Abstract:

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

Key words: porous ceramsite, cadmium-contairning wastewater, adsorption kinetics, chemical adsorption

摘要：

以黏土为骨料制备多孔陶粒, 研究了该陶粒对Cd²⁺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Cd²⁺具有良好的吸附能力;陶粒对Cd²⁺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;陶粒中的—OH、C—O基团参与了对Cd²⁺的吸附, 形成了CdO新相, 说明陶粒对²⁺的吸附包括化学吸附。

关键词: 多孔陶粒, 含铬废水, 吸附动力学, 化学吸附

CLC Number: 

• TB34

• TQ174