氯化锌改性稻草秸秆吸附Cu^(2+)的研究  

Study on Adsorption of Cu^(2+) by Rice Straw Modified by ZnCl_2

作　　者：李勇 陈钰[1] 

机构地区：[1]西南交通大学地球科学与环境工程学院,四川成都610031

出　　处：《安徽农业科学》2013年第26期10773-10775,共3页Journal of Anhui Agricultural Sciences

基　　金：中央高校基本科研业务费专项资金(SWJTU09BR166)

摘　　要：[目的]对氮化锌改性稻草秸秆吸附Cu2+进行研究。[方法]选用ZnCl2作为活化剂,用640 W的微波照射稻草秸秆4 min,对其进行改性。研究了不同吸附剂投加量、pH、吸附时间条件下,改性稻草秸秆对水溶液中Cu2+吸附的效果,并对其等温吸附特征、吸附动力学和热力学进行了系统地分析。[结果]当吸附剂投加量为0.2 g,pH为6时,氯化锌改性稻草秸秆对Cu2+的吸附效果最好,吸附达到平衡的时间为8 h。改性稻草秸秆对Cu2+的吸附过程符合Langmuir、Freundlich等温吸附模型以及准二级动力学方程。热力学分析表明,△G<0,该吸附反应属于自发反应。[结论]该研究为改性稻草秸秆在含铜废水处理中的应用提供了理论依据。[Objective] The study aimed to discuss the adsorption of Cu2＋ by rice straw modified by ZnCl2.[Method] After rice straw was activated by ZnCl2 for 4 min under the irradiation of microwave （640 W）,it was used to remove Cu2＋ from aqueous solution.The influences of adsorbent dosage,pH and adsorption time were investigated through dynamic tests.Moreover,adsorption isotherm models,thermodynamics models and kinetics models of the adsorption process between modified rice straw and Cu2 ＋ were systematically studied.[Result] Adsorbent dosage 0.2 g and pH =6 were optimum conditions for this absorption process,and this adsorption reached equilibrium when the adsorption was conducted for 8 h.The adsorption process of Cu2＋ by the modified rice straw could be fitted well by the Langmuir and Freundlich adsorption isotherms and the quasisecond order kinetics equation.During this adsorption process,△ G ＜ 0,so this adsorption process was spontaneous.[Conclusion] The research could provide scientific references for the application of the modified rice straw in the treatment of wastewater containing Cu2＋.

关 键 词：CU2+ 氯化锌 改性稻草秸秆 等温吸附 动力学 热力学 

分 类 号：S216.2[农业科学—农业机械化工程] X703[农业科学—农业工程]