纳米零价铁改性及其应用研究进展

Advances in the modification and application of nanoscale zero-valent Iron

纳米零价铁(nZVI)因其具有较好的吸附效果和还原性而被广泛用于环境污染物去除。然而,纳米零价铁易团聚、易氧化、易失活的问题使其在去除环境污染物方面效率降低。因此,有关纳米零价铁改性以增强其对环境污染物去除效率的研究已成为研究热点。围绕近几年国内外文献对纳米零价铁改性及其在环境中应用的研究结果,详细介绍了纳米零价铁常用的改性方法及其对环境污染物(如卤代有机物、重金属、硝酸盐)的去除效果和作用机理。同时指出纳米零价铁在改性和应用中尚需解决的问题和未来发展方向。

Nanoscale zero-valent iron(nZVI)has been used to remove environmental pollutants due to its good adsorption effect and reducibility.However,nZVI is easy to agglomerate,oxidize and inactivate,which reduces its efficiency in removing environmental pollutants.Therefore,research on the modification of nZVI to improve its efficiency in the removal of environmental pollutants has become a hot topic.The modification of nZVI and its applications at home and abroad in recent years were reviewed.Several commonly used modification methods of nZVI,their removal effects and mechanisms for environmental pollutants(such as halogenated organics,heavy metals,nitrate)were introduced in detail.In addition,the problems that need to be solved in the modification and application of nZVI and the future research direction were pointed out.