| Fe-Al改性硅藻土的制备及其对土壤Cd污染固定化效果 |
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| 引用本文： | 杨雨中,朱健,肖媛媛,谭蓉,王平,陈润华,徐海音,杨雄.Fe-Al改性硅藻土的制备及其对土壤Cd污染固定化效果[J].环境科学,2018,39(8):3854-3866. |
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| 作者姓名： | 杨雨中 朱健 肖媛媛 谭蓉 王平 陈润华 徐海音 杨雄 |
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| 作者单位： | 中南林业科技大学环境科学与工程学院;稻米品质安全控制湖南省工程实验室 |
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| 基金项目： | 国家自然科学基金项目（21707169）；国家重点研发计划项目（2016YFD0800805-4）；湖南省重点研发计划项目（2017SK2273，2016SK2030）；湖南省教育厅开放基金项目（15K147）；湖南省教育厅一般项目（16C1657，15C1410） |
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| 摘 要： | 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FTIR分析表明,通过改性增加了硅藻土的比表面积和Si—O—H基团,并且羟基铁铝被成功置入硅藻壳体内部,形成了有效柱体,增大了孔道间距,增强了硅藻土的表面活性.因此,羟基铁铝改性能有效地促进硅藻土对土壤镉的固定效果.提供的改性方法和实验结果,为硅藻土固定土壤重金属提供了新的技术手段和理论依据.
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| 关 键 词： | Fe-Al改性 硅藻土 镉 土壤 固定化 |
| 收稿时间： | 2017/12/5 0:00:00 |
| 修稿时间： | 2018/1/29 0:00:00 |
Preparation of Iron-Aluminum Modified Diatomite and Its Immobilization in Cadmium-Polluted Soil |
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| YANG Yu-zhong,ZHU Jian,XIAO Yuan-yuan,TAN Rong,WANG Ping,CHEN Run-hu,XU Hai-yin and YANG Xiong.Preparation of Iron-Aluminum Modified Diatomite and Its Immobilization in Cadmium-Polluted Soil[J].Chinese Journal of Environmental Science,2018,39(8):3854-3866. |
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| Authors: | YANG Yu-zhong ZHU Jian XIAO Yuan-yuan TAN Rong WANG Ping CHEN Run-hu XU Hai-yin and YANG Xiong |
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| Institution: | College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China,College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;Hunan Engineering Laboratory for Control of Rice Quality and Safety, Changsha 410004, China,College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China,College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China,College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;Hunan Engineering Laboratory for Control of Rice Quality and Safety, Changsha 410004, China,College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China,College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China and College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China |
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| Abstract: | |
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| Keywords: | Fe-Al modification diatomite cadmium soil immobilization |
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