期刊论文

Preparation of Iron-Aluminum Modified Diatomite and Its Immobilization in Cadmium-Polluted Soil

Zhu, Jian(zhujian198312@163.com)

中文

环境科学

0250-3301

2018

39

8

3854-3866

10.13227/j.hjkx.201712031

21707169:国家自然科学基金 2016YFD0800805-4:国家重点研发计划 2017SK2273:湖南省重点研发计划项目 2016SK2030:湖南省重点研发计划项目 15K147:湖南省教育厅开放基金 16C1657:湖南省教育厅一般项目 15C1410:湖南省教育厅一般项目

本校为第一机构

为了提高硅藻土对土壤镉污染的原位固定化效果,采用羟基Fe-Al对硅藻土进行改性,通过土壤培养实验研究了Fe / Al摩尔比、OH/cation摩尔比、陈化时间、(Fe + Al) /硅藻土比、反应温度、老化时间对土壤镉污染固定化效果的影响,同时采用扫描电镜(SEM)和傅里叶红外光谱(FTIR)分析了改性前后硅藻土理化特征的变化.结果表明,改性硅藻土最佳制备工艺条件为Fe /Al摩尔比1∶ 8、OH/cation摩尔比2.0 ~ 2.2、陈化时间2 d、(Fe + Al) /硅藻土比10 mmol·g ~(- 1)、反应温度60℃、老化时间2 d.改性硅藻土显著降低了土壤中可交换态镉的含量,硅藻土改性前后对交换态Cd含量的降低率由11.83%提升到39.52%. SEM与FT...

To improve the in-situ immobilization effect of diatomite on cadmium (Cd)-contaminated soil, diatomite was modified by hydroxyl iron-aluminum (Fe-Al). The soil incubation experiments were carried out to investigate the effect of Fe/Al molar ratio, OH/cation of molar ratio, pillaring agent aging time, (Fe+Al)/diatomite ratio, pillaring temperature, and pillaring product aging time on the immobilization of Cd in soils. The changes in properties of diatomite before and after modification were analyzed by scanning electron microscopy (SEM) and Four...