活性炭负载纳米零价铁/银复合材料对水中铅的吸附性能研究  

Study on the Adsorption Performance of Activated Carbon Loaded Nano Zero Valent Iron/Silver Composite Materials for Lead in Water

作　　者：李文斌[1] 陈志莉 周自坚[1] 姚航 LI Wenbin;CHEN Zhili;ZHOU Zijian;YAO Hang(School of Environmental Science and Engineering,Guilin University of Technology,Guilin 541004,China;Comprehensive Affairs Center of Beijing Agriculture and Rural Bureau,Beijing Municipal Committee of the Communist Party of China Rural Work Committee,Beijing 100000,China)

机构地区：[1]桂林理工大学环境科学与工程学院,广西桂林541004 [2]中共北京市委农村工作委员会北京市农业农村局综合事务中心,北京100000

出　　处：《水处理技术》2024年第10期58-62,74,共6页Technology of Water Treatment

基　　金：国家自然科学基金地区基金项目(51966003)。

摘　　要：通过液相还原法,将纳米零价铁(nZVI)和纳米银(nAg)负载到活性炭(AC)上,制备出一种新型复合材料(nAg/nZVI/AC),用于处理含铅废水。结果表明,在pH=7条件下,nAg/nZVI/AC对Pb(Ⅱ)的去除率达到99.7%,比原AC提高了74.28%。同时,银的加入提高了nZVI的反应活性,使吸附更快达到平衡。吸附过程与Langmuir模型(R2为0.972)和准二级动力学模型(R2为0.9219)更吻合。结合热力学分析结果,Pb(Ⅱ)的去除是一个以化学吸附为主的自发过程。A new type of composite material(nAg/nZVI/AC)was prepared by loading nano zero-valent iron(nZVI)and nano silver(nAg)on activated carbon(AC)through a liquid phase reduction method for the treatment of lead-containing wastewater.The results showed that under pH=7,the removal rate of Pb(II)by nAg/nZVI/AC reached 99.7%,which was 74.28%higher than the original AC.At the same time,the addition of silver improves the reaction activity of nZVI,enabling faster adsorption to reach equilibrium.The adsorption process is more consistent with the Langmuir model(R2=0.972)and the quasi-second-order kinetic model(R2=0.9219).Based on thermodynamic analysis results,the removal of Pb(II)is a spontaneous process dominated by chemical adsorption.

关 键 词：铅污染 纳米零价铁/纳米银 活性炭 吸附 

分 类 号：TQ424[化学工程]