化学改性铝污泥强化Cu^(2+)的吸附  

Enhanced adsorption of the Cu^(2+) by chemically modified aluminum sludge

作　　者：蒋翠婷 刘珊[1,2] 张悦 孙朝辉 田薪成 李涛 JIANG Cui-ting;LIU Shan;ZHANG Yue;SUN Zhao-hui;TIAN Xin-cheng;LI Tao(School of Environmental Science and Engineering,Chang’an University,Xi’an 710054,China;Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, Chang’an University,Xi’an 710054,China)

机构地区：[1]长安大学环境科学与工程学院,陕西西安710054 [2]长安大学旱区地下水文与生态效应教育部重点实验室,陕西西安710054

出　　处：《应用化工》2019年第3期506-510,共5页Applied Chemical Industry

基　　金：国家自然科学基金(51408041)

摘　　要：以净水厂铝污泥(AlS)为主要原料,依次经过铁盐浸渍和壳聚糖(CS)包覆,制得复合吸附剂AlS-Fe-CS,研究其对Cu^(2+)的吸附。结果表明,化学改性后,铁(氢)氧化物和CS复合在铝污泥上;最优吸附pH为5.5,吸附平衡时间为20 h,对Cu^(2+)的最大吸附量为72.36 mg/g,相比纯AlS性能提高了约1倍,且温度升高有利于吸附反应的进行;吸附过程符合拟二级动力学和Freundlich吸附等温线。The composite adsorbent AlS-Fe-CS was obtained from the aluminum sludge(AlS) of the water purification plant,which was successively immersed in iron salt solution and coated with chitosan(CS),and the adsorption characteristics of Cu^2+ were studied.The results showed that the iron(hydr)oxide and CS were successfully compounded on the AlS after the chemical modification;The optimum adsorption pH was 5.5,the adsorption equilibrium time was 20 h,the maximum adsorption capacity of modified AlS-Fe-CS for Cu^2+ removal in the experimental concentration range was 72.36 mg/g,which was twice higher than pure AlS,and increasing temperature was conducive to the adsorption;the adsorption process conformed to the pseudo-second-order kinetics model and the Freundlich adsorption isotherm model.

关 键 词：铝污泥 资源化 壳聚糖 铁(氢)氧化物 二价铜 吸附 

分 类 号：TQ424[化学工程] X703[环境科学与工程—环境工程]