高温焙烧底泥吸附重金属Mn^(2+)和Ni^(2+)的动力学与热力学研究  

Kinetics and Thermodynamics Research of Mn^(2+)and Ni^(2+) Adsorption Heavy Metals onto High Temperature Roasting Sediment

作　　者：程杨[1] 杨月红[1] 于珊珊[1] 张玉琴 宁平[1] 石磊[1] 张怀予[3] 

机构地区：[1]昆明理工大学环境科学与工程学院,昆明650500 [2]昆明绿水环保公司,昆明650093 [3]上海大学,上海200444

出　　处：《硅酸盐通报》2015年第7期1850-1856,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家科技部科技人员服务企业行动计划(2009GJF30019)

摘　　要：制备了高温焙烧底泥作为吸附剂,并对底泥焙烧前后的表征(SEM、FTRI、XRD、BET)进行研究与分析。采用静态吸附试验来研究高温焙烧底泥吸附废水中重金属Mn2+和Ni2+的吸附动力学与热力学的特性并确定吸附机理。结果表明:对高温焙烧底泥吸附的数据进行拟合且符合Langmuir和Freundlich吸附等温方程,但拟合效果更好的符合Freundlich吸附等温方程,表明吸附介于单层与多层之间。在高温焙烧底泥对Mn2+和Ni2+的吸附阶段用Lagergren伪一级吸附动力学方程和Lagergren伪二级吸附动力学方程进行拟合,其结果表明吸附过程遵循Lagergren伪二级吸附动力学方程,表明以化学吸附为主,对Mn2+、Ni2+的平衡吸附量分别为5.2083、3.6563 mg/g。由热力学参数(△S、△H和△G)表明:高温焙烧底泥对Mn2+和Ni2+的吸附均为吸热过程。Preparation of high-temperature roasting sediment as adsorbent,Characterization（ SEM、FTRI、XRD、BET） of sediment and roasting sediment was studied. Through static adsorption experiments,Adsorption kinetics and thermodynamics properties of roasting sediment adsorption of Mn2＋ and Ni2 ＋were researched. It was observed that the adsorption process was described with the Langmuir and Freundlich theories,and the Freundlich model indicated the best fit to the adsorption process,showing that adsorption is between monolayer and multilayer. The adsorption of the Mn2 ＋and Ni2 ＋onto the roasting sediment was described pseudo-first-order kinetics equation and pseudo-second-order kinetics equation,and the pseudo-second-order kinetics equation showed the best fit to the adsorption process,showing that it is dominated with chemical adsorption. Equilibrium adsorption capacity of roasting sediment for Mn2＋and Ni2＋ was found to be 5. 2083 mg / g and 3. 6563 mg / g. Thermodynamic parameters indicated（ △S,△H and △G） that the adsorption of the Mn2＋ and Ni2＋onto the roasting sediment are endothermic process.

关 键 词：高温焙烧底泥 吸附 重金属 动力学 热力学 

分 类 号：TU528[建筑科学—建筑技术科学]