In situ fabrication of a direct Z-scheme photocatalyst by immobilizing CdS quantum dots in the channels of graphene-hybridized and supported mesoporous titanium nanocrystals for high photocatalytic performance under visible light.
In situ fabrication of a direct Z-scheme photocatalyst by immobilizing CdS quantum dots in the channels of graphene-hybridized and supported mesoporous titanium nanocrystals for high photocatalytic performance under visible light.
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通过将 CdS 量子点固定在石墨烯杂化和负载的介孔钛纳米晶体的通道中，原位制造直接 Z 型光催化剂，以在可见光下实现高光催化性能。
DOI：
10.1039/c8ra08008a
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发表时间：
2018-12-12
期刊：
影响因子：
3.9
通讯作者：
Han, Zhenying
中科院分区：
文献类型：
--
作者：
Tang, Ningmei;Li, Youji;Chen, Feitai;Han, Zhenying
我们报告了直接Z-方案光催化剂的相当大的优势，通过固定高质量的CdS量子点（QD）的通道中的石墨烯杂化和负载的介孔二氧化钛（GMT）纳米晶体（CdS@GMT/GR）在简易的水热条件下。采用XRD、PL、XPS、SEM、DRS、TEM、EIS和N2吸附等手段对催化剂进行了表征。CdS量子点主要用作光敏剂，具有独特的孔嵌入结构，可有效利用光源。这种直接Z-方案CdS@GMT/GR表现出比CdS/GR、GMT/GR或CdS@MT更高的光催化活性。此外，CdS@GMT/GR-2的速率常数约为CdS@MT和GMT/GR速率常数之和的两倍，这是因为GR在与MT杂化和作为支撑物方面起到了空穴传输和收集层以及杂化能级形成的作用。因此，GR含量调谐能带，影响表面积，并控制直接Z方案系统的界面空穴转移和收集速率。此外，CdS@GMT/GR在重复光催化过程中保持其高性能。这可能是由于GR通过空穴传输和收集效应阻止了量子点的光腐蚀。提出了可能的反应机理。这一工作为构建高效可见光驱动的光催化剂提供了一种有前途的策略，以减少日益严重的环境污染威胁。CdS@GMT/GR具有高的光催化活性，这是由于CdS量子点固定在GMT纳米晶的孔道中而形成的直接Z-结构。
We report the considerable advantages of direct Z-scheme photocatalysts by immobilizing high-quality CdS quantum dots (QDs) in the channels of graphene-hybridized and supported mesoporous titania (GMT) nanocrystals (CdS@GMT/GR) under facile hydrothermal conditions. The photocatalysts have been characterized by XRD, PL, XPS, SEM, DRS, TEM, EIS, and N2 adsorption. CdS QDs primarily serve as photosensitizers with a unique pore-embedded structure for the effective utilization of the light source. This direct Z-scheme CdS@GMT/GR exhibits higher photocatalytic activity than CdS/GR, GMT/GR, or CdS@MT. In addition, the rate constant of CdS@GMT/GR-2 is approximately twice the sum of those of CdS@MT and GMT/GR, because GR played the role of hole-transporting and collection layer as well as the hybridization level formation in terms of hybridizing MT and serving as a support. Therefore, the GR content tunes the energy band, affects the surface area, and controls the interfacial hole transfer and collection rate of the direct Z-scheme system. Furthermore, CdS@GMT/GR retains its high performance in repeated photocatalytic processes. This can be attributed to the fact that GR prevents QDs from photocorrosion by means of the hole-transporting and collection effect. A possible reaction mechanism is proposed. This work provides a promising strategy for the construction of highly efficient visible-light-driven photocatalysts to reduce the growing menace of environmental pollution. CdS@GMT/GR exhibits high photocatalytic activity due to its direct Z-scheme structure obtained by immobilizing CdS quantum dots in the channels of GMT nanocrystals.
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影响因子：
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