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首页> 外文期刊>Journal of Materials Science >A new type of SnO2@beta-Fe(Zr)OOH hollow nanosphere as a bifunctional adsorbent for removing nitrate from water: kinetics, isotherm, and thermodynamic studies
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A new type of SnO2@beta-Fe(Zr)OOH hollow nanosphere as a bifunctional adsorbent for removing nitrate from water: kinetics, isotherm, and thermodynamic studies

机译：一种新型的SnO2 @ Beta-Fe（Zr）oOH中空纳米作为双官能吸附剂，用于从水中除去硝酸盐：动力学，等温线和热力学研究

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摘要

A SnO2@beta-Fe(Zr)OOH nanocomposite, beta-FeOOH doped with Zr on SnO(2)hollow spheres, was synthesized by two-step hydrothermal method to solve the problem of nitrate pollution in sewage. The structure and properties of samples which synthesized in this work were analyzed by means of XRD, SEM, TEM, XPS, BET and Zeta potential systematically. Moreover, the effects of initial nitrate concentration, pH, time and temperature on nitrate removal were also investigated. The amount of nitrate nitrogen adsorbed by the SnO2@beta-Fe(Zr)OOH nanocomposite was 14.0 mg/g in the first 30 min. Based on the analysis of the nitrate adsorption kinetic model of SnO2@beta-Fe(Zr)OOH nanocomposite in water, the adsorption was in line with the second-order kinetic model and belonged to chemical adsorption. It showed that the Langmuir adsorption isotherm model fitting results are superior to the Freundlich isothermal adsorption model through fitting the adsorption isotherm. With the increase of temperature, the maximum adsorption capacity showed the same trend, which indicated that the adsorption process is an endothermic process. In addition, adsorption thermodynamic studies were carried out to prove that the reaction process is a spontaneous reaction. After six adsorption-desorption cycles, the composite still has an adsorption capacity of 80%.
机译：通过两步水热法掺杂有SnO（2）空心球上的Zr掺杂有Zr的SnO2@βFoOH（Zr）OOH纳米复合材料，通过两步水热法合成，解决污水中硝酸盐污染问题。通过XRD，SEM，TEM，XPS，BET和Zeta系统系统地分析了在该工作中合成的样品的结构和性质。此外，还研究了初始硝酸盐浓度，pH，时间和温度对硝酸盐去除的影响。通过SnO2β-Fe（Zr）OOH纳米复合材料吸附的硝酸氮的量在前30分钟中为14.0mg / g。基于SnO2 @β-Fe（Zr）OOH纳米复合在水中硝酸盐吸附动力学模型的分析，吸附符合二阶动力学模型，属于化学吸附。结果表明，通过装配吸附等温线，Langmuir吸附等温线拟合结果优于Freundlich等温吸附模型。随着温度的增加，最大吸附能力显示出相同的趋势，表明吸附过程是吸热过程。此外，进行吸附热力学研究以证明反应过程是自发反应。经过六次吸附 - 解吸循环后，复合材料仍具有80％的吸附能力。

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  • 来源
    《Journal of Materials Science》 |2020年第33期|共16页
  • 作者

    Weng Mingmei; Zhu Qi; Wang Aiwen; Liu Guanjin; Huang Honghao;

  • 作者单位

    Heilongjiang Univ Sch Chem &

    Mat Sci Harbin 150080 Peoples R China;

    Heilongjiang Univ Sch Chem &

    Mat Sci Harbin 150080 Peoples R China;

    Heilongjiang Univ Sch Chem &

    Mat Sci Harbin 150080 Peoples R China;

    Heilongjiang Univ Sch Chem &

    Mat Sci Harbin 150080 Peoples R China;

    Heilongjiang Univ Sch Chem &

    Mat Sci Harbin 150080 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
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