| Zn系LDHs负载改性石英砂和沸石对Cr(Ⅵ)吸附效果对比及其作用机理研究 |
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| 引用本文： | 何春艳,张翔凌,喻俊,向洋,邓礼楚,赵双杰,高静湉,袁野,雷雨.Zn系LDHs负载改性石英砂和沸石对Cr(Ⅵ)吸附效果对比及其作用机理研究[J].环境科学学报,2019,39(2):399-409. |
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| 作者姓名： | 何春艳 张翔凌 喻俊 向洋 邓礼楚 赵双杰 高静湉 袁野 雷雨 |
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| 作者单位： | 武汉理工大学土木工程与建筑学院,武汉,430070;泛华建设集团有限公司湖北设计分公司,武汉,430010 |
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| 基金项目： | 国家自然科学基金（No.31670541，31270573） |
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| 摘 要： | 为提升人工湿地常用填料对受污染水体中Cr(VI)的吸附性能,采用水热-共沉淀法在碱性条件下制备了Zn系LDHs涂层负载改性沸石和石英砂填料,并运用场发射扫描电子显微镜(SEM)、能谱分析仪(EDS)和BET等手段对改性前后填料的表面形态和化学成分进行了表征.最后,通过等温吸附试验、动力学吸附试验、吸附热力学试验对Zn系LDHs改性填料和天然填料的Cr(VI)吸附效果及其作用机理进行了对比研究.结果表明,通过Zn系LDHs涂层负载,沸石和石英砂对Cr(VI)的吸附类型由以物理吸附为主的多分子层吸附向以化学吸附为主的单分子层吸附转换,有利于吸附水中的Cr(VI);热力学相关参数ΔS~00,ΔG~00,ΔH~00,表明对Cr(VI)的吸附是自发放热过程.相比于天然沸石和石英砂,Zn系LDHs负载改性沸石和石英砂的表面物化性状发生明显变化,最大饱和吸附容量明显提高,尤其是石英砂的最大饱和吸附容量从21 mg·kg~(-1)提升到125 mg·kg~(-1).改性同种天然填料时,ZnAl-LDHs负载改性的效果更佳;而相对于天然沸石的改性,Zn系LDHs负载改性能更有效地提高石英砂对Cr(VI)的吸附能力.因此,本实验中ZnAl-LDHs负载改性石英砂可推荐用于实际人工湿地中Cr(VI)的去除.
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| 关 键 词： | 吸附 Zn系LDHs 沸石 石英砂 人工湿地 |
| 收稿时间： | 2018/6/18 0:00:00 |
| 修稿时间： | 2018/9/15 0:00:00 |
Study on adsorption performance and mechanism of Cr(VI) by Zn-LDHs coating on zeolites and quartz sands |
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| HE Chunyan,ZHANG Xiangling,YU Jun,XIANG Yang,DENG Lichu,ZHAO Shuangjie,GAO Jingtian,YUAN Ye and LEI Yu.Study on adsorption performance and mechanism of Cr(VI) by Zn-LDHs coating on zeolites and quartz sands[J].Acta Scientiae Circumstantiae,2019,39(2):399-409. |
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| Authors: | HE Chunyan ZHANG Xiangling YU Jun XIANG Yang DENG Lichu ZHAO Shuangjie GAO Jingtian YUAN Ye and LEI Yu |
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| Institution: | School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070,School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070,Hubei Design Branch, PAN-CHINA Construction Group Co. Ltd., Wuhan 430010,School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070,School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070,School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070,School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070,School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070 and School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070 |
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| Abstract: | |
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| Keywords: | adsorption Zn-LDHs zeolite quartz sand constructed wetlands |
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