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首页> 外文期刊>Chemosphere >Efficient day-night photocatalysis performance of 2D/2D Ti_3C_2/Porous g-C_3N_4 nanolayers composite and its application in the degradation of organic pollutants
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Efficient day-night photocatalysis performance of 2D/2D Ti_3C_2/Porous g-C_3N_4 nanolayers composite and its application in the degradation of organic pollutants

机译：2D / 2D Ti_3C_2 /多孔g-C_3N_4纳米层复合材料的高效昼夜光催化性能及其在降解有机污染物中的应用

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摘要

It is hindered by the limited light time that the development of photocatalysis technology, which is a clean and energy-saving advanced oxidation process. In this work, a 2D/2D Ti3C2/porous g-C3N4 nanolayers composited van der Waals (VDW) heterostructure photocatalyst (Ti3C2/PCN) was prepared by a straightforward vacuum filtration method after an ultrasonic stripping process. In this Ti3C2/PCN composite photocatalyst, PCN nanolayers play the role of absorbing visible light, while Ti3C2 nano-layers form VDW heterojunction with PCN nanolayers, which is beneficial to migration of photo-generated electrons from PCN to Ti3C2. The band structure match of Ti3C2/PCN and the build-in electric field from the VDW heterojunction both favor the effective separation and migration of photo-induced charge carriers that is why the Ti3C2/PCN composite shows good day-photocatalytic capability with 98% phenol removal efficiency. Besides, as a good electronic storage material, the Ti3C2 can store excess photo-generated electrons under light irradiation and release them when exposed to electron acceptors in the dark condition. Therefore, the night-photocatalysis can work out even without sunlight, in which 32% phenol was decomposed. In addition, the universality of Ti3C2/PCN day-night photocatalytic system is proved by the degradation of various organic pollutants. The design of this day-night photocatalyst can facilitate the application of photocatalytic reaction to actual environmental scenes, since it reduces the limitation imposed by the presence or absence of sunlight. (C) 2019 Elsevier Ltd. All rights reserved.
机译：光时间技术的发展阻碍了光催化技术的发展，光催化技术是一种清洁，节能的先进氧化工艺。在这项工作中，在超声剥离过程之后，通过直接的真空过滤方法制备了2D / 2D Ti3C2 /多孔g-C3N4纳米层复合范德华（VDW）异质结构光催化剂（Ti3C2 / PCN）。在这种Ti3C2 / PCN复合光催化剂中，PCN纳米层起吸收可见光的作用，而Ti3C2纳米层与PCN纳米层形成VDW异质结，这有利于光生电子从PCN迁移到Ti3C2。 Ti3C2 / PCN的能带结构匹配和来自VDW异质结的内置电场都有利于光感应载流子的有效分离和迁移，这就是为什么Ti3C2 / PCN复合材料在98％苯酚下表现出良好的日光催化能力的原因去除效率。此外，作为良好的电子存储材料，Ti3C2可以在光照射下存储过量的光生电子，并在黑暗条件下暴露于电子受体时将其释放。因此，即使在没有阳光分解32％的苯酚的情况下，夜间光催化也可以进行。此外，通过各种有机污染物的降解证明了Ti3C2 / PCN昼夜光催化系统的普遍性。这种昼夜光催化剂的设计可以促进将光催化反应应用于实际的环境场景，因为它减少了由于存在或不存在阳光而施加的限制。 （C）2019 Elsevier Ltd.保留所有权利。

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  • 来源
    《Chemosphere》 |2020年第5期|125760.1-125760.10|共10页
  • 作者

  • 作者单位

    Dalian Univ Technol Sch Environm Sci & Technol Minist Educ Key Lab Ind Ecol & Environm Engn Dalian 116024 Peoples R China;

    Dalian Univ Technol Sch Environm Sci & Technol Minist Educ Key Lab Ind Ecol & Environm Engn Dalian 116024 Peoples R China|Dalian Univ Technol Sch Elect Engn Dalian 116024 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Day-night photocatalyst; van der waals heterostructure; Electron-storage material; Ti3C2; Porous g-C3N4;

    机译：昼夜光催化剂;范德华异质结构;电子存储材料;Ti3C2;多孔g-C3N4;

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