改性龙须眼子菜吸附水溶液中Cu^2＋的性能  

Properties of Cu^(2+) adsorption onto modified Potamogeton pectinatus L. in aqueous solution

作　　者：刘益贵[1,2] 周理程[3,2] 彭克俭[1,2] 柴立元[3,2] 杨志辉[3,2] 

机构地区：[1]湖南省环境保护科学研究院,长沙410004 [2]水污染控制技术湖南省重点实验室,长沙410004 [3]中南大学冶金科学与工程学院,长沙410083

出　　处：《环境科学学报》2009年第8期1649-1656,共8页Acta Scientiae Circumstantiae

基　　金：国家科技支撑重点计划项目(No.2007BAC25B01);国家水体污染控制与治理科技重大专项(No.2008ZX07212-001-02);湖南省环境保护科技项目(No. [2007]185)~~

摘　　要：采用批式实验法对改性龙须眼子菜吸附溶液中Cu2+的吸附动力学过程及吸附平衡进行了研究,考察了溶液初始pH值、吸附剂用量、温度等对改性龙须眼子菜吸附Cu2+的影响.结果表明,吸附动力学过程可以用准二级动力学方程进行拟合,吸附等温线符合Langmuir模型而不符合Freundlich模型.吸附实验的优化条件为:溶液初始pH值为4.0～5.6,溶液初始Cu2+浓度与吸附剂用量比值为10～25mg.g-1,吸附时间为30～45min,吸附温度为20～30℃.龙须眼子菜经甲醇改性后对Cu2+的吸附性能有了很大程度的提高;在改性龙须眼子菜吸附Cu2+的过程中,存在离子交换作用,但不占主导地位;改性龙须眼子菜吸附Cu2+主要依靠醇、酚类中的O—H基团,酰胺类中的CO、N—H与C—N基团,砜类中的SO基团与Cu2+的配位作用.Batch experiments were conducted to investigate the kinetics and equilibrium of Cu^2＋ adsorption onto modified pondweed Potamogeton pectinatus L biomass. The effects of initial pH value, adsorbent dosage and reaction temperature on Cu^2＋ adsorption were evaluated. The kinetics of Cu^2＋ adsorption onto modified P. pectinatus L. fit a pseudo-second-order equation well. The adsorption data fit the Langmuir isotherm model rather than the Freundlich isotherm. The optimized conditions for Cu^2＋ adsorption onto modified P. pectinatus L. were an initial pH of 4.0 - 5.6, reaction time of 30 - 45 min, reaction temperature of 20-30 ℃ and ratio of initial Cu^2＋ concentration to adsorbent dose of 10 -25 mg·g^-1. Cu^2＋ adsorption was improved by the modification of P. pectinatus L. with methyl alcohol. Although an ion-exchange reaction occurred in the process of Cu^2＋ adsorption onto modified P. pectinatus L. , it was not dominant. The Cu^2＋ adsorption is mainly attributed to complexation between Cu^2＋ and O--H groups in alcohols and phenols, C=O, N-H and C-N groups in amides, and S=O groups in sulfones.

关 键 词：沉水植物 改性 生物吸附 吸附动力学 吸附等温线 

分 类 号：X703.1[环境科学与工程—环境工程]