巯基改性木薯秸秆对Cd(Ⅱ)吸附性能的研究  

Study on the Adsorption of Cd(Ⅱ) by Sulfydryl Modified Cassava Straw

作　　者：邓华[1] 严发 陆志诚 康彩艳[1] 莫蔚明 DENG Hua;YAN Fa;LU Zhicheng;KANG Caiyan;MO Weiming(College of Environment and Resource, Guangxi Normal University University Key Laboratory of Karst Ecology and Environmental Change of Guangxi Province Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology;Environmental Protection Bureau of Yongfu, Guilin, Guang＇xi;Schoal of Chemistry and Pharmaceutical Science, Guangxi Normal University： Guilin 541004, China)

机构地区：[1]广西师范大学环境与资源学院,岩溶生态与环境变化研究广西高校重点实验室,广西环境污染控制理论与技术重点实验室 [2]广西桂林市永福县环境保护局 [3]广西师范大学化学与药学学院,广西桂林541004

出　　处：《水处理技术》2018年第6期57-61,共5页Technology of Water Treatment

基　　金：国家自然科学基金项目(21267005);桂林市科技开发项目(20140106-9);岩溶生态与环境变化研究广西高校重点实验室项目(YRHJ152004)

摘　　要：通过化学改性的方法向木薯秸秆中添加巯基官能团,研究了溶液的p H、投加量、吸附时间、Cd(Ⅱ)的初始含量以及温度对其吸附性能的影响,并通过扫描电镜、红外光谱、元素分析和X射线光电子能谱等技术分析表征,研究吸附机理。结果表明,经过巯基改性后的木薯秸秆的吸附量得到提升,吸附量随p H的升高而增大,随温度的升高而降低。适宜的p H为6~8,对Cd(Ⅱ)的吸附120 min内达到平衡。吸附Cd(Ⅱ)的反应符合Langmiur等温模型和准2级动力学方程,最大吸附量为72.09 mg/g。吸附过程为自发的放热过程。Cassava stalk was modified by chemical modification with sulfydryl functional group addition, the effects ofpH, dosage, adsorption time, initial content of Cd（Ⅱ） and temperature on the adsorption performance were studied, and the adsorption mechanism was researched by scanning electron microscopy, infrared spectroscopy, elemental analysis and X ray electron energy spectrum analysis technology. The results showed that the adsorption capacity of cassava straw modified by sulfhydryl groups was improved, and the adsorption capacity increased with the increase ofpH, and decreased with the increase of temperature. The optimal pH was 6 to 8, and the adsorption equilibrium of Cd（Ⅱ） was reached within 120 min. The adsorption of Cd（Ⅱ） conformed to the Langmiur isothermal model and the quasi two order kinetic equation. The maximum adsorption capacity was 72.09 mg/g and the adsorption process was spontaneous exothermic process.

关 键 词：木薯秸秆 巯基改性 镉 吸附机理 

分 类 号：TQ424.3[化学工程]