摘要：

以稻壳为原料,采用微波处理制备出改性的吸附材料,用于吸附Pb²⁺、Cd²⁺的实验,探讨了溶液pH、搅拌时间及金属离子初始浓度等对吸附平衡的影响,利用扫描电镜和红外光谱(FTIR)分析,探讨微波处理后的稻壳吸附Pb²⁺、Cd²⁺等金属离子的吸附机理。结果表明:微波处理后的稻壳对Pb²⁺的最佳吸附pH=5,在60 min内建立吸附平衡,对Pb²⁺的最大吸附量为0.2324 mmol/g;在相同条件下对Cd²⁺的最大吸附量为0.1852 mmol/g。

关键词: 稻壳, 微波处理, 吸附, 金属离子

Abstract:

A kind of modified adsorptive material has been prepared by microwave, using rice husks as raw materials.It is an experiment used for adsorbing Pb²⁺ and Cd²⁺. The influences of solution pH, stirring time, initial concentration of metallic ions, etc. on adsorption equilibrium are discussed. The adsorption mechanisms of microwave-treated rice husks for metallic ions, such as Pb²⁺, Cd²⁺, etc. are analyzed by making use of SEM and FTIR and discussed. The results show that the optimal conditions for the microwave-treated rice husks to adsorb Pb²⁺ are as follows:pH is 5 and the adsorption equilibrium should be set up within 60 min, the maximum adsorption capacity for Pb²⁺ is 0.2324 mmol/g. Under the same conditions, the maximum adsorption capacity for Cd²⁺ is 0.1852 mmol/g.

Key words: rice husks, microwave treatment, adsorption, metallic ion

中图分类号: 

• X703