聚多巴胺改性煤渣对水中Cr^(6+)的吸附  

Adsorption of Cr^(6+) in solution by polydopamine modified cinder

作　　者：高叶玲 褚海艳 许端平[2] GAO Ye-ling;CHU Hai-yan;XU Duan-ping(Ordos Vocational College of Eco-environment,Ordos 017010,Inner Mongoli,China;Liaoning Technical University,Fuxin 12300,Liaoning Province,China)

机构地区：[1]鄂尔多斯生态环境职业学院,内蒙古鄂尔多斯017010 [2]辽宁工程技术大学,辽宁阜新123000

出　　处：《化学工程》2021年第4期18-22,共5页Chemical Engineering(China)

基　　金：内蒙古自治区高等学校科学研究项目(NYZY20209)。

摘　　要：为进一步探究廉价煤渣对水中重金属的吸附,并解决煤渣在吸附过程中的团聚问题,文中实验利用聚多巴胺(PDA)改性煤渣(C),制备新型复合材料PDA-C,采用SEM,EDS,FTIR对复合材料进行表征。探讨了改性前后的吸附效果,并考察了吸附剂投加量、溶液pH值对吸附效果的影响,结果表明:吸附剂PDA-C投加量为0.25 g,pH值为3.0时对Cr^(6+)的去除效果达到92.58%。对吸附数据进行拟合得到:PDA-C对Cr^(6+)的吸附与伪二级动力学方程拟合度较好,相关系数为0.93;Freundlich模型(R^(2)>0.95)能较好地描述等温过程,说明该吸附过程以化学吸附为主,且温度升高有利于吸附进行。研究结果可为固体废弃物的资源化利用及其用于废水中重金属的吸附去除提供理论依据。To explore the removal of heavy metals in water by cheap cinder and solve the problem of agglomeration of cinder in the adsorption,polydopamine(PDA)was used to modify cinder to prepare a new composite material PDA-C,besides,the composite material was characterized through SEM,EDS and FTIR.Adsorption effects before and after modification were discussed,and the effects of the dosage,solution pH were investigated.The results show that when the dosage of adsorbent PDA-C is 0.25 g,and the pH is 3.0,the removal effect of Cr^(6+) can reach 92.58%.The fitting data show that the removal of Cr^(6+) in solution by PDA-C fits the pseudo-second-order kinetic equation well,and the correlation coefficient is 0.93.Freundlich model(R^(2)>0.95)can describe the isothermal process better,which indicate it is mainly based on physical-chemical compound adsorption,and the temperature increase is conductived to adsorption.The results can provide a theoretical basis for recycling of solid waste and the removal of heavy metals in wastewater.

关 键 词：煤渣 聚多巴胺 重金属 吸附 动力学模型 

分 类 号：TQ536.4[化学工程—煤化学工程]