不同硅铝比的ZSM-5型沸石分子筛吸附水中Cu^(2+)离子的研究  

Study on adsorption of Cu^(2+) from aqueous solution by ZSM-5 molecular sieve of different SiO_2/Al_2O_3 ratios

作　　者：万东锦[1] 袁海静[1] 曲丹[2] 王洪杰[2] 陈静[1] 刘永德[1] 

机构地区：[1]河南工业大学化学化工学院,郑州450001 [2]北京林业大学环境科学与工程学院,北京100085

出　　处：《环境工程学报》2011年第12期2681-2686,共6页Chinese Journal of Environmental Engineering

基　　金：国家高技术研究发展计划(863)项目(2009AA062905);北京林业大学青年科技启动基金(BLX2009018;BLX2009019);河南工业大学博士基金(2009BS057);高等学校博士学科点专项科研基金(20100014120004)

摘　　要：考察了3种不同硅铝比的ZSM-5沸石分子筛(25H、38H和50H,25、38和50为硅铝比)对水中Cu2+的吸附过程及其影响因素。结果表明,3种材料均能有效吸附去除水中Cu2+离子,动力学符合假二阶动力学模型,吸附等温线符合Langmuir吸附等温式。3种材料吸附速率及吸附容量顺序为:25H>50H>38H,其中,25H最大吸附容量达到12.83 mg/g。投加量由0.8 g/L增加至2.0 g/L,材料对Cu2+吸附去除率由87.0%增加至97.5%。考察水中常见阳离子对吸附的干扰作用,结果表明,干扰离子的影响顺序为:Pb2+>K+>Na+>Mg2+;随着干扰离子浓度的增大,材料对Cu2+的去除率显著下降。硅铝比及晶粒形貌均对沸石分子筛吸附Cu2+有较大影响,小的孔径不利于Cu2+的吸附,低硅铝比有利于Cu2+在分子筛上的吸附。Adsorption of Cu2＋ from aqueous solution by three kinds of ZSM-5 molecular sieve （25H, 38H, 50H, 25, 38 and 50 were SiO2/Al2O3 ratio） was investigated. The results showed that the ZSM-5 molecular sieves could adsorb Cu2＋ from aqueous solution effectively. The adsorption process attributes to pseudo seeond- order kinetics model and the equilibrium isotherm for Cu2＋ uptake corresponds closely to the Langmuir model. The corresponding sequence of adsorption rate and capacity was： 25H 〉 50H 〉 38H. The maximum adsorption eapaeity of 25H was up to 12.83 mg/g. As the adsorbent dosage inereased from 0.8 g/L to 2.0 g/L, the removal rate in- creased from 87.0% to 97.5% eorrespondingly. The common cations could affect the adsorption process, the corresponding sequence was Pb2＋ 〉 K ＋ 〉 Na ＋ 〉 Mg2＋. And higher eoncentration of eo-existing cation had greater influence on adsorption removal efficiency. The SiO2/Al2O3 ratio and morphology features both have influenee on Cu2＋ adsorption, small pore size disbennifits adsorption, and low SiO2/Al2O3 ratio facilitates adsorption.

关 键 词：沸石分子筛 硅铝比 吸附 铜离子 

分 类 号：X703[环境科学与工程—环境工程]