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高指数晶面二氧化钛对砷、锑的共吸附去除

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聂晓, 阎莉, 张建锋. 高指数晶面二氧化钛对砷、锑的共吸附去除[J]. 环境化学, 2018, 37(2): 318-326. doi: 10.7524/j.issn.0254-6108.2017061202
引用本文: 聂晓, 阎莉, 张建锋. 高指数晶面二氧化钛对砷、锑的共吸附去除[J]. 环境化学, 2018, 37(2): 318-326. doi: 10.7524/j.issn.0254-6108.2017061202
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NIE Xiao, YAN Li, ZHANG Jianfeng. Simultaneous removal of arsenic and antimony on high-index TiO2(HTiO2)[J]. Environmental Chemistry, 2018, 37(2): 318-326. doi: 10.7524/j.issn.0254-6108.2017061202
Citation: NIE Xiao, YAN Li, ZHANG Jianfeng. Simultaneous removal of arsenic and antimony on high-index TiO2(HTiO2)[J]. Environmental Chemistry, 2018, 37(2): 318-326. doi: 10.7524/j.issn.0254-6108.2017061202
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高指数晶面二氧化钛对砷、锑的共吸附去除

  • 1.

    西安建筑科技大学环境与市政工程学院, 西安, 710055;

  • 2.

    中国科学院生态环境研究中心, 北京, 100085;

  • 3.

    中国科学院大学, 北京, 100049

  • 基金项目:

    国家自然科学基金（41373123）和陕西省自然科学基础研究计划（2016JM5080）资助.

Simultaneous removal of arsenic and antimony on high-index TiO2(HTiO2)

  • 1.

    School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China;

  • 2.

    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China;

  • 3.

    University of Chinese Academy of Sciences, Beijing, 100049, China

  • Fund Project: Supported by the National Natural Science Foundation of China(41373123) and Natural Science Basic Research Plan in Shaanxi Province of China(2016JM5080).

  • 摘要: 砷（As）和锑（Sb）作为有毒元素，造成的环境污染严重威胁人类健康.目前，由于缺乏对共存体系下砷锑表面化学性质的研究以及高效的吸附材料，砷、锑的共去除是环境领域面临的一大挑战.本文以高指数晶面{201}二氧化钛（HTiO2）为吸附剂，研究砷锑在其表面的吸附行为.Langmuir吸附等温线结果表明，As（Ⅲ）、Sb（Ⅲ）、As（Ⅴ）、Sb（Ⅴ）在HTiO2表面的最大吸附量分别为0.407、0.861、0.197、0.181 mmol·g-1.砷、锑在HTiO2表面的吸附动力学符合拟二级动力学方程，说明化学吸附是控制吸附速率的关键因素.pH边共吸附实验表明，HTiO2对As（Ⅲ）的吸附基本不受pH的影响；对Sb（Ⅲ）的吸附随pH的升高先增大后减小；对As（Ⅴ）和Sb（Ⅴ）的吸附随pH的升高逐渐降低.Zeta电位结果表明，砷锑吸附后HTiO2表面带负电，说明砷、锑在HTiO2表面形成带负电的稳定内层配合物.本研究为水体中砷锑的共吸附去除提供了新信息.
    Abstract: Arsenic (As) and antimony (Sb) are toxic elements. They pose an emerging environmental risk and threaten human health. However,the removal of As and Sb remains a contemporary challenge due to the lack of knowledge in their surface chemistry and efficient adsorbent. In this study,the adsorption reaction of As and Sb on high-index {201} TiO2 (HTiO2) was examined. The results show that the adsorption isotherms of As(Ⅲ),Sb(Ⅲ),As(Ⅴ),and Sb(Ⅴ) on HTiO2 conformed to the Langmuir model with a maximum adsorption capacity of 0.407,0.861,0.197,and 0.181 mmol·g-1,respectively. The kinetics of As and Sb adsorption on HTiO2 followed the pseudo-second order reaction,suggesting that chemical adsorption was the rate-controlling step. The adsorption pH envelope experiments demonstrated that pH had a negligible effect on As(Ⅲ) adsorption. Sb(Ⅲ) adsorption was enhanced with increasing pH and then decreased. The adsorption of As(Ⅴ) and Sb(Ⅴ) was favorable at acidic pH and decreased with the increase in pH. Zeta potential shows that the HTiO2 surface was negatively charged over the full pH range upon As and Sb adsorption,indicating the formation of negatively charged inner-sphere As and Sb complexes on HTiO2. This study provides new information for simultaneous As and Sb removal from contaminated water.
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  • 收稿日期:  2017-06-12
  • 刊出日期:  2018-02-15

高指数晶面二氧化钛对砷、锑的共吸附去除

  • 1.  西安建筑科技大学环境与市政工程学院, 西安, 710055;
  • 2.  中国科学院生态环境研究中心, 北京, 100085;
  • 3.  中国科学院大学, 北京, 100049
  • 收稿日期:  2017-06-12
基金项目:

国家自然科学基金（41373123）和陕西省自然科学基础研究计划（2016JM5080）资助.

摘要: 砷（As）和锑（Sb）作为有毒元素，造成的环境污染严重威胁人类健康.目前，由于缺乏对共存体系下砷锑表面化学性质的研究以及高效的吸附材料，砷、锑的共去除是环境领域面临的一大挑战.本文以高指数晶面{201}二氧化钛（HTiO2）为吸附剂，研究砷锑在其表面的吸附行为.Langmuir吸附等温线结果表明，As（Ⅲ）、Sb（Ⅲ）、As（Ⅴ）、Sb（Ⅴ）在HTiO2表面的最大吸附量分别为0.407、0.861、0.197、0.181 mmol·g-1.砷、锑在HTiO2表面的吸附动力学符合拟二级动力学方程，说明化学吸附是控制吸附速率的关键因素.pH边共吸附实验表明，HTiO2对As（Ⅲ）的吸附基本不受pH的影响；对Sb（Ⅲ）的吸附随pH的升高先增大后减小；对As（Ⅴ）和Sb（Ⅴ）的吸附随pH的升高逐渐降低.Zeta电位结果表明，砷锑吸附后HTiO2表面带负电，说明砷、锑在HTiO2表面形成带负电的稳定内层配合物.本研究为水体中砷锑的共吸附去除提供了新信息.

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