Fe-Ni、Fe-Zr水合氧化物的掺杂特征及其对PO43-和AsO43-的吸附机制  

Doping characteristics of Fe-Ni and Fe-Zr hydroxides and their adsorption mechanisms towards aqueous PO and AsO anions

作　　者：向超 张弓 于洁[1,2] 王洪杰 付军[3] XIANG Chao;ZHANG Gong;YU Jie;WANG Hongjie;FU Jun(College of Environmental Science and Engineering,Beijing Forestry University,Beijing 100083,China;Center for Water and Ecology,State Key Joint Laboratory of Environment Simulation and Pollution Control,School of Environment,Tsinghua University,Beijing 100084,China;China-Japan Environmental Friendly Protection Center,Beijing 100029,China)

机构地区：[1]北京林业大学环境科学与工程学院,北京100083 [2]清华大学环境学院,环境模拟与污染控制国家重点实验室,水质与水生态研究中心,北京100084 [3]中日环境友好保护中心,北京100029

出　　处：《环境工程学报》2021年第1期8-19,共12页Chinese Journal of Environmental Engineering

基　　金：国家水体污染控制与治理科技重大专项(2018ZX07110);国家自然科学基金面上项目(51578067,51778054,51708543)。

摘　　要：水中含氧阴离子的高效去除是水质净化领域的研究前沿和热点之一。以地球上含量丰富的、具有代表性的3d过渡金属Fe、Ni和前4d过渡金属Zr的金属盐为前驱物,采用水热法,制备了过渡金属的水合氧化物及Fe-Ni和Fe-Zr复合水合氧化物,并以磷酸根和砷酸根为目标污染物,评价了这些过渡金属的水合氧化物及Fe-Ni和Fe-Zr复合材料的吸附性能。结果表明:Fe-Ni复合材料吸附性能优于单一材料,Fe-Zr复合材料的吸附性能归因于Zr的本征吸附活性;少量Ni或Zr的掺杂可显著调控过渡金属d电子态,Fe和Ni在晶体晶格中相互掺杂形成Fe-Ni复合氧化物,而Fe-Zr复合材料中FeOH和ZrOH以混合的晶粒形式存在。综合上述结果,Fe-Ni和Fe-Zr水合氧化物不同的掺杂特征是造成复合吸附材料对含氧阴离子吸附效能差异的根本原因。The efficient removal of aqueous oxyanions is one of the forefronts and hotspot research in the field of water purification.In this study,metal salts of the earth’s rich and representative 3d transition metals Fe,Ni and the first 4d transition metal Zr elements were taken as precursors,the hydroxides of these transition metals and Fe-Ni and Fe-Zr composite hydroxides were prepared by hydrothermal method.Then the oxyanionic adsorption properties of these hydroxide adsorbents were evaluated using phosphate and arsenate as target pollutants.The results showed that the adsorption performance of Fe-Ni composites was better than that of single metallic materials,while the better adsorption performance of Fe-Zr composites could be attributed to the intrinsic adsorption activity of Zr.The doping of a small amount of Ni or Zr could significantly regulate the d electronic state of transition metals in Fe-Ni and Fe-Zr composite hydroxides,where Fe and Ni were doped with each other in the crystal lattice,while FeOH and ZrOH in the Fe-Zr composite material existed as their mixed grains.Further analysis showed that the different doping characteristics of Fe-Ni and Fe-Zr hydroxides were the fundamental reasons for their difference in the adsorption efficiency of aqueous oxyanions.

关 键 词：金属水合氧化物 掺杂特征 含氧阴离子 吸附机制 

分 类 号：X703[环境科学与工程—环境工程]