新型低成本吸附剂稻壳对Cu(Ⅱ)的去除行为研究  

Characteristics of Cu(Ⅱ) Removal by Low-Cost Novel Adsorbent of Rice Husk

作　　者：范春辉[1] 张颖超[1] 张颖[1] 

机构地区：[1]东北农业大学资源与环境学院,哈尔滨150030

出　　处：《化学学报》2010年第21期2175-2180,共6页Acta Chimica Sinica

基　　金：国家科技支撑计划(No.2009BADC2B00);黑龙江省自然科学基金(No.E2007-16)资助项目

摘　　要：借助吸附动力学和吸附等温线方程,研究了稻壳对Cu(II)的去除性能,考察了流速、溶液初始pH值对动态吸附穿透曲线的影响,利用扫描电镜(SEM)表征了稻壳的表面形貌,通过红外光谱(FTIR)、X射线衍射分析(XRD)、X射线荧光光谱(XRF)探讨了Cu(II)的去除机制和途径.结果表明:吸附过程符合准二级动力学方程和Langmuir等温线方程,稻壳对Cu(II)的理论吸附容量为1.6173mg?g-1,吸附反应可以自发进行.不同操作条件下,穿透曲线的走势有一定差异.在Cu(II)的去除过程中,OH、SiO-烷基等官能团有重要作用;XRD图谱显现了纤维素的特征峰,吸附后没有发现Cu(II)的典型峰;反应完成后稻壳上检测到了Cu(II)的存在,XRF证明了吸附反应的可进行性.Rice husk was used as adsorbent to study Cu（II） removal efficiency from aqueous solution on the basis of adsorption kinetics and isotherm equations,breakthrough curves affected by flow rates and initial pH values were analyzed,surface characteristics of rice husk and Cu（II） removal mechanism was investigated with the help of SEM,FTIR,XRD and XRF.The adsorption process fit pseudo second order kinetics equation and Langmuir isotherm equation with adsorption capacity on Cu（II） 1.6173 mg？g-1.The reaction could happen spontaneously.Environmental factors could affect shapes of breakthrough curves to some extent.Functional groups of OH and SiO-CxHy played an important role for Cu（II） removal,characteristic adsorption band of cellulose was found in XRD spectra,while no wave band of Cu（II） appeared after adsorption.Cu（II） was detected on rice husk after adsorption by XRF,it proved the reaction feasibility.

关 键 词：稻壳 CU(II) 吸附动力学 去除机制 

分 类 号：X703[环境科学与工程—环境工程]