ZnCr双金属层状材料对废水中酸性红14的吸附性能  

Adsorption to Acid Red 14 in Wastewater by ZnCr Bimetal Layered Materials

作　　者：刘凤仙[1] 邵蒙蒙[1] 夏盛杰[1] 倪哲明[1] 

机构地区：[1]浙江工业大学化学工程学院,杭州310014

出　　处：《无机化学学报》2015年第7期1342-1350,共9页Chinese Journal of Inorganic Chemistry

基　　金：浙江省自然科学基金(No.LQ15B030002)资助项目

摘　　要：采用共沉淀法制备性能优异的层状材料锌铬水滑石(ZnxCr-LDHs,x=2,3,4),并探究各种因素对吸附酸性红14(AR14)的影响。XRD、ICP、FTIR及BET表征结果表明:合成的ZnxCr-LDHs晶型良好且稳定,具备介孔结构。实验结果表明:最佳吸附剂为Zn3Cr-LDHs,比表面积为101 m2·g-1,对AR14的最大吸附容量为484.63 mg·g-1。同时,降低溶液p H值和提高溶液温度均可促进AR14的吸附。该吸附过程分别符合准二级动力学模型和Freundlich等温吸附模型。结合Materials Studio 5.5软件模拟,推测该吸附机理主要以表面吸附为主,-SO3-基团是反应点。Zinc chrome bimetal layered materials （ZnxCr-LDHs, x=2, 3, 4） were successfully synthesized by the coprecipitation method and different factors on the adsorption of AR14 were also investigated. The characterization of XRD, ICP, FTIR and BET revealed that the crystal structures of ZnxCr-LDHs （x=2, 3, 4） were very good and stable, it had the mesoporous structure. Experimental results indicated that the optimum sorbent was Zn3Cr-LDHs with a specific surface area of 101 m2·g-l, the maximum adsorption capacity for AR14 was 484.63 mg ·g-1. Moreover, lower pH value and higher temperature were favorable to the removal of AR14. Adsorption isotherms and kinetics showed that the adsorption process could be well fitted with the pseudo- second-order kinetic and Freundlich equation. Based on the analysis of Materials Studio 5.5 simulation, the adsorption menchanism was that AR14 were adsorbed on the surface of Zn3Cr-LDHs, the -SO3- group was the reaction point.

关 键 词：锌铬水滑石 吸附 酸性红14 

分 类 号：O614.241[理学—无机化学] O614.611[理学—化学]