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TiO2-FeOOH/Mmt纳米复合材料的表面酸碱性质及光催化性能

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刘子薇, 胡丽君, 孙振亚, 张翠, 方继敏. TiO2-FeOOH/Mmt纳米复合材料的表面酸碱性质及光催化性能[J]. 环境化学, 2020, (3): 745-754. doi: 10.7524/j.issn.0254-6108.2019092707
引用本文: 刘子薇, 胡丽君, 孙振亚, 张翠, 方继敏. TiO2-FeOOH/Mmt纳米复合材料的表面酸碱性质及光催化性能[J]. 环境化学, 2020, (3): 745-754. doi: 10.7524/j.issn.0254-6108.2019092707
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LIU Ziwei, HU Lijun, SUN Zhenya, ZHANG Cui, FANG Jimin. The surface acidity and basicity and photocatalytic activity of TiO2-FeOOH/Mmt nanocomposites[J]. Environmental Chemistry, 2020, (3): 745-754. doi: 10.7524/j.issn.0254-6108.2019092707
Citation: LIU Ziwei, HU Lijun, SUN Zhenya, ZHANG Cui, FANG Jimin. The surface acidity and basicity and photocatalytic activity of TiO2-FeOOH/Mmt nanocomposites[J]. Environmental Chemistry, 2020, (3): 745-754. doi: 10.7524/j.issn.0254-6108.2019092707
shu

TiO2-FeOOH/Mmt纳米复合材料的表面酸碱性质及光催化性能

  • 1. 武汉理工大学资源与环境工程学院, 武汉, 430070;

  • 2. 武汉理工大学材料研究与测试中心, 武汉, 430070

    • 通讯作者: 孙振亚, E-mail: 653818799@qq.com ; 
  • 基金项目:

    国家自然科学基金（41372054）资助.

The surface acidity and basicity and photocatalytic activity of TiO2-FeOOH/Mmt nanocomposites

  • 1. School of Resources and Environmental Engineering, Wuhan University of Technol, Wuhan, 430070, China;

  • 2. Centre for Materials Research and Analysis, Wuhan University of Technology, Wuhan, 430070, China

    • Corresponding author: SUN Zhenya, 653818799@qq.com ; 
  • Fund Project: Supported by the National Natural Foundation of China (41372054).

  • 摘要: 本研究以蒙脱石（Mmt）为基底材料，利用自组装制备技术得到TiO2-FeOOH/Mmt纳米复合材料，以亚甲基蓝为降解目标物，研究复合材料光催化降解性能.利用透射电子显微镜（TEM）、比表面积及孔隙分析仪（BET）和紫外-可见分光光度计（UV-Vis）对制备材料进行表征分析，结果表明由针铁矿和锐钛矿组成的复合材料带隙宽度减小且光响应范围得到拓宽.着重通过表面酸碱滴定实验，结合ProtoFit表面络合模型模拟软件，对光催化前后材料表面酸碱性质变化情况进行了分析，发现复合材料的lgKa值并非单层材料的简单叠加，而是复合后发生了一定的表面化学作用形成新的表面酸碱性质.复合材料具有更大的表面位密度Nt及表面化合态≡XOH含量，能使材料在表面反应过程中提供更多的表面活性物质，产生更多的自由基，间接加快目标物降解速度.且复合材料铁循环强度更大，该循环能有利反应过程中电子的转移，并维持材料表面活性.这为后期进一步研究纳米复合材料光催化降解机理提供理论依据.
    Abstract: In this study, montmorillonite (Mmt) was used as the base material, and TiO2-FeOOH/Mmt nanocomposites were prepared by self-assembly preparation technique. MB was used as the degradation target to study the photocatalytic degradation performance of the composite materials. Transmission electron microscope (TEM), specific surface area and porosity analyzer (BET) and ultraviolet and visible spectrophotometry (UV-Vis) were used to characterize the prepared materials. The results showed that the band gap width of composite materials composed of goethite and anatase was decreased. At the same time the light response range was widened. The surface acid-base titration experiment and ProtoFit surface complex model simulation software were used to analyze the changes in acidity and alkalinity on the surface of the material before and after photocatalysis. The lgKa of the composite was not simply superimposed, indicating that a surface chemical reaction took place to synergistically form a new surface acidity and alkalinity after composited. The composite material has higher Nt and surface compound ≡XOH content, which could make the material provide more surface active substances in the process of surface reaction, generate more free radicals, and indirectly accelerate the degradation rate of the target material. Moreover, the strength of the iron cycling of the composite material was greater, which could facilitate the electron transfer in the reaction process and maintain the surface activity of the material. This provided a theoretical basis for further research on photocatalytic degradation mechanism of nanocomposites.
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  • 收稿日期:  2019-09-27

TiO2-FeOOH/Mmt纳米复合材料的表面酸碱性质及光催化性能

    通讯作者: 孙振亚, E-mail: 653818799@qq.com ; 
  • 1. 武汉理工大学资源与环境工程学院, 武汉, 430070;
  • 2. 武汉理工大学材料研究与测试中心, 武汉, 430070
  • 收稿日期:  2019-09-27
基金项目:

国家自然科学基金（41372054）资助.

摘要: 本研究以蒙脱石（Mmt）为基底材料，利用自组装制备技术得到TiO2-FeOOH/Mmt纳米复合材料，以亚甲基蓝为降解目标物，研究复合材料光催化降解性能.利用透射电子显微镜（TEM）、比表面积及孔隙分析仪（BET）和紫外-可见分光光度计（UV-Vis）对制备材料进行表征分析，结果表明由针铁矿和锐钛矿组成的复合材料带隙宽度减小且光响应范围得到拓宽.着重通过表面酸碱滴定实验，结合ProtoFit表面络合模型模拟软件，对光催化前后材料表面酸碱性质变化情况进行了分析，发现复合材料的lgKa值并非单层材料的简单叠加，而是复合后发生了一定的表面化学作用形成新的表面酸碱性质.复合材料具有更大的表面位密度Nt及表面化合态≡XOH含量，能使材料在表面反应过程中提供更多的表面活性物质，产生更多的自由基，间接加快目标物降解速度.且复合材料铁循环强度更大，该循环能有利反应过程中电子的转移，并维持材料表面活性.这为后期进一步研究纳米复合材料光催化降解机理提供理论依据.

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