SUN Ziling, ZHU Jian, TAN Rong, CI Kaidong, WANG Ping, MA Chunya, LIU Zixuan, TAN Miao

(College of Environmental Science and Engineering；Hunan Engineering Laboratory for Control of Rice Quality and Safety,Central South University of Forestry and Technology, Changsha 410004, China)

Abstract: Using the simulated cadmium-polluted soil as research object, the diatomite was modified by hydroxyl iron. Through soil culture test, the influence of iron and soil mass ratio and diatomite load of hydroxyl iron (HyFe-De2) on the effect of improving cadmium contaminated soil were studied, and the changes of micromorphology and active groups of diatomite before and after modification were analyzed by SEM and FTIR. The results show that when the iron and soil mass ratio is 2 ∶1, HyFe-De2 has the best control effect on soil cadmium, and the content of exchangeable soil cadmium decreases by 27.2% compared with the control group. With the increase of the dosage of HyFe-De2, the content of exchangeable cadmium in the soil gradually decreases, the pH value of the soil gradually decreases, and the water content rises first and then decreases. There is no obvious change in the organic matter, and the content of available iron and effective manganese continuously increases. When the dosage of HyFe-De2 is 1.5%, HyFe-De2 has the best effect on soil cadmium control. SEM and FTIR analysis show that the surface properties of diatomite are effectively improved by the introduction of a large number of hydroxyl groups. Compared with the control group, the content of exchangeable cadmium in HyFe-De2 soil decreases by 34.4% and increases by 65.4%, indicating significant improvement effect.HyFe-De2 can effectively fix cadmium in soil by adsorption of diatomite coupled with hydroxyl iron.

Keywords: diatomite; iron carbonyl; coat modification; soil; cadmium pollution

中图分类号：X703                                文献标志码：A

文章编号：1008-5548(2019)06-0068-07

DOI:10.13732/j.issn.1008-5548.2019.06.012

收稿日期： 2019-04-25， 修回日期：2019-07-11，在线出版时间：2019-09-29 16:23。

基金项目：国家自然科学基金项目，编号：21707169；国家重点研发计划项目，编号：2016YFD0800805-4；湖南省重点研发计划项目，编号：2017SK2273,2016SK2030；湖南省教育厅开放基金项目：编号15K147。

第一作者简介：孙梓菱(1995—)，女，硕士研究生，研究方向为土水污染控制与修复。E-mail：sunziling1995@163.com。

通信作者简介：朱健(1983—)，男，博士，副教授，硕士生导师，研究方向为水体和土壤重金属污染治理研究。E-mail：zhujian198312@163.com。