腐植酸对氧化锌吸附Cu(Ⅱ)的影响  

Effects of humic acid on the adsorption of copper(Ⅱ) onto zinc oxide

作　　者：谢发之[1,2] 谢志勇[1,3] 李国莲[1,2] 李海斌[1,2] 汪雪春 岳先名 李振宇[1,3] XIE Fa-zhi;XIE Zhi-yong;LI Guo-lian;LI Hai-bin;WANG Xue-chun;YUE Xian-ming;LI Zhen-yu(Anhui Key Laboratory of Water Pollution Control and Wastewater Resource, Hefei 230022, China;School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230022, China;School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei 230022, China)

机构地区：[1]水污染控制与废水资源化安徽重点实验室,安徽合肥230022 [2]安徽建筑大学环境与能源工程学院,安徽合肥230022 [3]安徽建筑大学材料与化学工程学院,安徽合肥230022

出　　处：《中国环境科学》2017年第8期2970-2977,共8页China Environmental Science

基　　金：安徽省自然科学基金项目(1608085MB43);国家自然基金项目(21107001);安徽省教育厅自然科学研究重点项目(KJ2016A154);安徽省2014年高校优秀青年人才支持计划项目

摘　　要：为研究复杂三元体系中HA(Humic acid,腐殖酸)对氧化锌吸附Cu(Ⅱ)的影响,探究HA对重金属Cu(Ⅱ)在环境中迁移转化的作用机理,通过改变HA的添加顺序及添加量,系统研究了HA在不同环境条件下对氧化锌吸附Cu(Ⅱ)的影响作用.结果表明,添加HA能显著降低氧化锌对Cu(Ⅱ)的吸附量,在p H为5.05时添加50mg/L的HA,Cu(Ⅱ)的最大吸附量降低了61.74%;离子强度增大会促进氧化锌对Cu(Ⅱ)的吸附,在NaNO_3浓度为1.0mol/L时最大吸附量为21.79mg/g;p H值为5.05时吸附量达到最大值,升温有利于氧化锌对Cu(Ⅱ)吸附,氧化锌对Cu(Ⅱ)的吸附符合Freundlich模型.HA不同添加顺序对Cu(Ⅱ)的吸附量的影响表现为对照>后添加HA>同时添加HA>先添加HA.红外光谱特征表明,HA和Cu(Ⅱ)在氧化锌表面吸附位点形成竞争吸附,并且氧化锌表面的羟基在吸附HA和Cu(Ⅱ)的过程中产生重要作用.To study the influence of humic acid on the adsorption of Cu(II)by zinc oxide,the adsorption of Cu(II)on zinc oxide in different environment conditions were investigated,by changing the order of addition and dosage of HA.The mechanism of fate and transport of Cu(II)in the water environment was also proposed.The results showed that the adsorption Cu(II)on zinc oxide could be significantly reduced by adding HA,and that the Cu(II)maximum adsorption decreased61.74%by adding50mg/L HA in the pH of5.05.The Cu(II)adsorption increased by increasing the ionic strength,the maximum adsorption was21.79mg/g when the concentration of NaNO3was1.0mol/L.When the pH value was5.05the adsorption reached the maximum;and temperature was in favor of Cu(II)adsorption on zinc oxide.Cu(II)adsorption on zinc oxide fitted the Freundlich model well.The adding orders of HA influence the Cu(II)adsorption as the following:non-adding>adding after>adding simultaneously>adding ahead.The characteristics of infrared spectra showed that HA and Cu(II)form competitive adsorption on the surface adsorption and surface hydroxyl of zinc oxide play an important role in adsorption of HA and Cu(II).

关 键 词：腐植酸 氧化锌 Cu(Ⅱ) 吸附 

分 类 号：X703.1[环境科学与工程—环境工程]