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首页> 外文期刊>Journal of materials science >Enhanced photocatalytic organic dye removal performance of micro-nanostructured TiO_2/graphene composites by using hydrochloric acid control its morphology
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Enhanced photocatalytic organic dye removal performance of micro-nanostructured TiO_2/graphene composites by using hydrochloric acid control its morphology

机译：盐酸控制其形态改善纳米结构TiO_2 /石墨烯复合材料的光催化有机染料去除性能

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摘要

In this study, hydrochloric acid solution concentration-controlled microanostructured mixed crystalline phase of TiO_2 coated with graphene was prepared via a one-step hydrothermal method to improve photocatalytic degradation of organic pollutants. By several characterization methods such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy, we demonstrate that the mixed crystal phase of TiO_2 (2-5 nm) evenly distributed among the thin graphene layers when the concentration of hydrochloric acid solution is 3 mol/L. Compared with the bare P25, the photocatalytic activity and adsorption capacity of the composites were much enhanced, resulting from the involving of graphene sheet as chainmail, which facilitates the charge separation, suppresses the recombination of electron-hole pairs, and improves light conversion efficiency of catalysts. In addition, the degradation rate of microanostructured TiO_2/GN (graphene) composite under ultraviolet light irradiation was much higher than pure TiO_2. After 40 min irradiation, the degradation rate of RhB reaches 97.2%. It is expected that this synthetic strategy may provide a new pathway for the fabrication of various GN-based hybrids with multi-dimensional microanostructures.
机译：本研究通过一步水热法制备了盐酸溶液浓度可控的石墨烯包覆的TiO_2微/纳米结构混合晶相，以提高光催化降解有机污染物的能力。通过X射线衍射，扫描电子显微镜，透射电子显微镜等几种表征方法，我们证明了当盐酸溶液的浓度为3时，TiO_2（2-5 nm）的混合晶相均匀分布在石墨烯薄层中摩尔/升。与裸P25相比，复合材料的光催化活性和吸附能力大大提高，这归因于石墨烯片作为链邮的参与，这有利于电荷分离，抑制了电子-空穴对的重组，并提高了光转换效率。催化剂。此外，微/纳米结构的TiO_2 / GN（石墨烯）复合材料在紫外光照射下的降解速率远高于纯TiO_2。辐照40分钟后，RhB的降解率达到97.2％。可以预期，这种合成策略可能为制造具有多维微观/纳米结构的各种基于GN的混合体提供一条新途径。

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  • 来源
    《Journal of materials science》 |2017年第19期|14543-14553|共11页
  • 作者

    Gao Huhu; Mo Zunli; Wang Yawen; Niu Xiaohui; Li Zhenliang;

  • 作者单位

    Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, China;

    Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, China;

    Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, China;

    Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, China;

    Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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