谷壳对水中Cr(Ⅵ)离子的生物吸附研究  

STUDIES OF THE BIOSORPTION OF Cr(Ⅵ) FROM AQUEOUS SOLUTION BY RICE HUSK

作　　者：贾娜娜[1] 方为茂[1] 赵红卫[1] 林学理[1] 

机构地区：[1]四川大学化工学院,成都610065

出　　处：《离子交换与吸附》2011年第2期110-120,共11页Ion Exchange and Adsorption

基　　金：国家科技支撑计划:2007BAE58B02

摘　　要：以间歇吸附的方式考察农业副产物谷壳对模拟废水中Cr(Ⅵ)离子的生物吸附过程,用扫描电镜(SEM)、红外光谱(FTIR)分析谷壳的表面形态和表面官能团结构及其变化,探讨其吸附机理。结果表明,吸附反应符合Langmuir和Freunlich等温吸附模式、遵循拟二级动力学模型,Cr(VI)离子的最大去除率几乎可以达到100%,吸附过程包括物理吸附和化学吸附。用0.2mol/L的NaOH溶液解吸再生的谷壳,吸附能力增加,可以循环使用。The process of the biosorption of Cr（Ⅵ） ions from synthetic wastewater by rice husk,one of agricultural by-products,was studied by batch adsorption.The surface morphology and functional group structure changes of rice husk were analyzed by Scanning electron microscope（SEM） and Fourier transform infrared spectrometer（FTIR）,and the adsorption mechanism was discussed.The results showed that the equilibrium adsorption model conformed to Langmuir and Freunlich adsorption isothermal models,followed the quasi-second dynamic equation.The maximum removal rate of Cr（Ⅵ） could almost reach 100%.Adsorption process included physical and chemical adsorption.The adsorption ability of rice husk increased after regeneration,with 0.2mol/L of NaOH solution,and it could be used repeatedly.

关 键 词：谷壳 生物吸附 铬离子 热力学 动力学 

分 类 号：O647.3[理学—物理化学]