文献类型：期刊文献

中文题名：零价铁去除水中硒的研究进展

英文题名：Research progress of removal selenium from aqueous solution by zero-valent iron

作者：鲍淳煜[1];罗伟锋[2];寿建昕[3];董华平[1];李益民[1]

机构：[1]绍兴文理学院化学化工学院,绍兴312000;[2]煤科集团杭州环保研究院有限公司,杭州311201;[3]绍兴文理学院生命科学学院,绍兴312000

年份：2022

卷号：41

期号：2

起止页码：719

中文期刊名：环境化学

外文期刊名：Environmental Chemistry

收录：CSTPCD、、CSCD2021_2022、北大核心、CSCD、北大核心2020

基金：国家自然科学基金(21677101);浙江省自然科学基金(LY20B070004)资助。

语种：中文

中文关键词：零价铁;硒;吸附;还原;共存离子;环境修复

外文关键词：zero-valent iron;selenium;adsorption;reduction;coexisting ions;environment remediation

中文摘要：硒(Se)在水中主要以SeO_(3)^(2-)和SeO_(4)^(2-)离子形式存在,具有溶解度高、迁移能力强、毒性高等特点,过量摄入会对生命健康造成严重危害.零价铁(ZVI)是一种绿色、安全、高效且廉价的环境修复材料,通过表面氧化层的吸附作用,以及ZVI、吸附态Fe(Ⅱ)以及绿锈等活性次生矿物的还原作用,将Se(Ⅳ)和Se(Ⅵ)主要还原为低毒性、低溶解度的Se(0),从而去除水中高毒性的SeO_(3)^(2-)和SeO_(4)^(2-).纳米零价铁(nZVI)比表面积大、活性更高,去除Se的速率更快、效率更高,可以将SeO_(3)^(2-)和SeO_(4)^(2-)更多地还原为Se(-Ⅱ).利用无机粘土、生物炭等材料负载nZVI,不仅可以解决nZVI易团聚、易迁移、潜在毒性风险高等问题,还可以通过载体材料的吸附、pH稳定、电子传递等作用,进一步增强nZVI对水体中Se的去除效果.实际环境中的缓冲离子、无机离子以及pH、弱磁场等各种因素易对ZVI去除Se的活性产生影响,这些都将影响ZVI在处理实际含Se废水中的应用效果.因此,未来通过研究阐明环境各种因素对ZVI去除Se的影响机理,对ZVI去除工艺进一步优化,有望解决ZVI处理实际含Se废水的瓶颈问题.

外文摘要：Selenium(Se)exists in aqueous environment as two oxyanion species:SeO_(3)^(2-)and SeO_(4)^(2-),which have the characteristics of good mobility,high solubility and strong toxicity.The excessive intake of Se will do serious harm to the life health of human.Zero valent iron(ZVI)is a green,safe,efficient and low-cost environment remediation material.Se(Ⅳ)and Se(Ⅵ)can be adsorbed onto the surface oxidation layer of ZVI firstly,then the sorbed Fe(Ⅱ),green rust and ZVI itself reduce them into Se(0)with low toxicity and low solubility.Nano-zero valent iron(nZVI)has the advantages of larger specific surface area and higher reactivity,to remove Se faster and with higher efficiency than micron-sized ZVI,and it can reduce Se(Ⅳ)and Se(Ⅵ)further to Se(-Ⅱ).Clay and biochar are used to support nZVI to solve its problems of easy aggregation,easy mobility and potentially toxic risk.Through the effects of clay and biochar including adsorption,pH buffering,electron mediation,the removal of Se will be enhanced by supporting nZVI on these carriers.The buffer ions,inorganic ions in natural aqueous environment,pH and low-intensity magnetic field are summarized to show different effects on the reactivity of ZVI towards Se,and further influence the practical effect of ZVI in the remediation to real Se-bearing wastewater.Therefore,if future studies are focused to understand the effect mechanism of each factor in environment on the removal of Se by ZVI,to further optimize the removal technology by ZVI,the bottleneck problems in the remediation on the real Se-bearing wastewater by ZVI will be resolved.