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Graphene quantum dots modified ZnO + Cu heterostructure photocatalysts with enhanced photocatalytic performance

机译：石墨烯量子点改性ZnO + Cu异质结构光催化剂，具有增强的光催化性能

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摘要

ZnO represents a typical class of semiconductor oxide with unique photocatalytic activity. However, its photocatalytic activity under continuous ultraviolet (UV) light irradiation is greatly limited by fast carrier recombination and photocorrosion behavior. Two of the most effective methods to solve the challenges are blending with electron acceptor materials and surface modification. Here, a novel heterostructure photocatalyst of a graphene quantum dot (GQD) surface modified ZnO + Cu composite was prepared via a simple spin-coating and annealing process. This photocatalyst exhibits significant improvements in UV-light irradiated photodegradation of rhodamine B (RhB) compared to ZnO. The improved photocatalytic ability could be attributed to the synergistic effects of Cu nanoparticles (NPs) and GQDs, which play an important role in light absorption, charge separation and transfer, and photocorrosion. Meanwhile, the enhanced degree is related to the amount of surface modified GQDs.
机译：ZnO表示具有独特光催化活性的典型半导体氧化物。然而，其在连续紫外线（UV）光照下的光催化活性受到快速载体重组和光腐蚀行为的极大限制。解决挑战的两种最有效的方法是用电子受体材料和表面改性混合。这里，通过简单的旋涂和退火工艺制备石墨烯量子点（GQD）表面改性ZnO + Cu + Cu复合材料的新型异质结构光催化剂。与ZnO相比，该光催化剂表现出UV光照射光降解的UV光照射光降解。改善的光催化能力可归因于Cu纳米粒子（NPS）和GQD的协同作用，其在光吸收，电荷分离和转移和光腐蚀中起着重要作用。同时，增强程度与表面改性GQD的量有关。

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