纳米零价铁对水中W(Ⅵ)的去除研究  

Removal of W(Ⅵ) from water by nanoscale zero-valent iron

作　　者：韩梦媛 张亚雷[2,3] 张勇[1,3] HAN Meng-yuan;ZHANG Ya-lei;ZHANG Yong(Guizhou Provincial Key Laboratory for Mountainous Area Environment Information System and Ecological Environment Protection,Guizhou Normal University,Guiyang 550001,China;National Engineering Research Center of Protected Agriculture,Tongii University,Shanghai 200092,China;State Key Laboratory of Pollution Control and Resource Reuse,Tongji University,Shanghai 200092,China)

机构地区：[1]贵州师范大学贵州省山地环境信息系统和生态环境保护重点实验室,贵州贵阳550001 [2]同济大学国家设施农业工程技术研究中心,上海200092 [3]同济大学污染控制与资源化研究国家重点实验室,上海200092

出　　处：《现代化工》2019年第1期114-118,共5页Modern Chemical Industry

基　　金：国家自然科学基金(51278356)

摘　　要：采用液相还原法制备纳米零价铁(nZVI),用于去除水中的W(Ⅵ),考察了nZVI的质量浓度、W(Ⅵ)的初始质量浓度、磷酸根(PO_4^(3-))对去除效果的影响,并对反应产物进行表征。结果表明,当nZVI的质量浓度为0. 3 g/L、W(Ⅵ)的初始质量浓度为20 mg/L时,去除效果最好。投加不同摩尔浓度PO_4^(3-)会改变W(Ⅵ)的去除效果; W(Ⅵ)被nZVI还原为W(Ⅴ),还原产物W(Ⅴ)的质量分数随着PO_4^(3-)摩尔浓度的增加呈现递减趋势;少量PO_4^(3-)存在会改变nZVI的链状结构,当PO_4^(3-)∶W(Ⅵ)=10∶1(摩尔比)时,nZVI的"核-壳"结构保存完整,这是因为PO_4^(3-)会在n ZVI表面竞争吸附位点并在其表面形成Fe3(PO4)2,抑制nZVI对W(Ⅵ)的去除。Nano-zero-valent iron( n ZVI) is prepared by liquid phase reduction method and is used to remove W( Ⅵ) from water.Influences of the concentration of n ZVI,the initial concentration of W( Ⅵ),temperature and phosphate radical( PO43-) on the removal effect are studied and the reaction products are characterized.It is found that the best removal effect can be achieved when the concentration of n ZVI is 0. 3 g·L-1 and the initial concentration of W( Ⅵ) is 20 mg·L-1.The molar concentration of PO43- can affect the removal effect of W( Ⅵ).W( Ⅵ) is reduced to W( Ⅴ) by n ZVI and the relative content of the reduction product W( Ⅴ) shows a decreasing trend with the increase of PO43- molar concentration.The presence of a small amount of PO43- can change the chain-like spherical structure of n ZVI. When the molar ratio between PO43- and W( Ⅵ) is equal to 10 ∶ 1,the "core-shell "structure of n ZVI is intact and remains complete,which indicates that PO43- and W( Ⅵ) compete each other for adsorption sites on the n ZVI surface and simultaneous precipitation Fe3( PO4)2 precipitation forms.

关 键 词：纳米零价铁 钨 钨酸根 吸附 磷酸根 

分 类 号：X523[环境科学与工程—环境工程]