2,4-二硝基酚在离子交换树脂上吸附与微波脱附  

Adsorption and Microwave Desorption of 2, 4-dinitrophenol in Anion Exchange Resin

作　　者：谢祖芳[1] 朱万仁[1] 黄中强[1] 陈光全[1] 

机构地区：[1]玉林师范学院化学与生物系,广西玉林537000

出　　处：《环境科学与技术》2008年第12期44-46,66,共4页Environmental Science & Technology

基　　金：广西教育厅科研基金项目(200507215)

摘　　要：研究了717强碱阴离子交换树脂对水中2,4-二硝基苯酚(2,4-DNP)的吸附解吸性能,探讨了吸附的热力学和动力学特性及其微波脱附性能。结果表明:在pH=4～11时,该树脂对2,4-DNP有较强的吸附能力。Freundlich吸附等温方程能很好地描述吸附平衡数据,吸附过程为放热、熵减的自发过程。吸附动力学符合Lagergren二级速率方程,颗粒内扩散是吸附速率的主要控制步骤,可采用HSDM模型描述。以1mol/L HNO3+C2H5OH溶液作为脱附剂,采用微波辅助脱附再生,微波辐照累计5min时,酚脱附率可达90%以上。Adsorption and desorption of aqueous 2, 4-dinitrophenol （2, 4-DNP） solution with 717 strongly basi anion exchange resin were investigated. Adsorption thermodynamics and kinetics as well as microwave desorption were also studied. Results indicated that the resin had high adsorption capacity of 2, 4-DNP in pH 4-11. Freundlich models could simulate adsorption equilibrium data, and adsorption was a spontaneous, exothermal and entropy decreasing process. Adsorption kinetics was satisfactory to Lagergren pseudo-second order rate equation. Intrapartical diffusion was the rate of controlling step and could be described by HSDM model. 2, 4-DNP adsorbed in the resin can be eluted, with elution rate over 90% when using lmol/L HNO3＋C2HsOH solution as a desorbent and total microwave irradiation time of 5min.

关 键 词：717强碱阴离子交换树脂 2 4-二硝基苯酚 吸附 热力学 动力学 微波脱附 

分 类 号：X703[环境科学与工程—环境工程]