增强可见光吸收和电荷分离的碳量子点/BiPO4纳米复合材料

doi:10.15541/jim20170283

摘要/Abstract

摘要：

通过水热法一步合成了具有增强可见光吸收和电荷分离的碳量子点/BiPO₄纳米复合光催化材料。通过降解罗丹明B染料表征了碳量子点/BiPO₄纳米复合材料的光催化性能。结果表明：在模拟太阳光或可见光的照射下,碳量子点/BiPO₄复合材料的光催化性能均优于单纯的BiPO₄。碳量子点/BiPO₄复合材料光催化性能的提升可归因于碳量子点对可见光的吸收增加了太阳光的利用率,以及碳量子点的电子转移和储存性质提高了材料的电荷分离效率。

关键词: 光催化, 碳量子点, BiPO₄, 电子转移

Abstract:

In this study, a CQDs/BiPO₄nanocomposite with enhanced visible-light absorption and charge separation was fabricated via a one-step hydrothermal reaction. The photocatalytic activity of the CQDs/BiPO₄nanocomposite was evaluated by degradation of rhodamine B (RhB). The result showed that the CQDs/BiPO₄ composite exhibited superior photocatalytic performance to pure BiPO₄ under simulated solar light, as well as under visible light irradiation. Its enhanced photocatalytic performance could be ascribed to the excellent light harvesting properties, which increased utilization rate of solar energy, electron transfer efficiency and reservoir ability of the nanocompsites, facilitating the charge separation efficiency of the composite.

Key words: photocatalysis, carbon quantum dots, BiPO₄, electron transfer

中图分类号:

TQ174

张志洁, 徐家跃, 曾海波, 张娜. 增强可见光吸收和电荷分离的碳量子点/BiPO₄纳米复合材料[J]. 无机材料学报, 2018, 33(5): 582-586.

ZHANG Zhi-Jie, XU Jia-Yue, ZENG Hai-Bo, ZHANG Na. Carbon Quantum Dots/BiPO₄ Nanocomposites with Enhanced Visible-light Absorption and Charge Separation[J]. Journal of Inorganic Materials, 2018, 33(5): 582-586.

图/表 6

Fig. 1 XRD patterns of pure BiPO4 and CQDs/BiPO4 composites with different amounts of CQDs

Fig. 2 TEM image of the CQDs/BiPO4 composite (2.4wt%) (a) and high resolution TEM image of the CQDs/BiPO4 composite (b)

Fig. 3 UV-Vis diffuse reflectance spectra of the as-prepared samples

Fig. 4 (a) Degradation efﬁciency of RhB as a function of time by pure BiPO4 and CQDs/BiPO4 composites with different amounts of CQDs under simulated solar light irradiation; degradation efﬁciency of RhB (b) and phenol (c) as a function of time by pure BiPO4 and CQDs/BiPO4 composites (2.4wt%) under visible light irradiation (λ>420 nm)

Fig. 5 Transient photocurrent response curves of pure BiPO4 and CQDs/BiPO4 composite (2.4wt%)

Fig. 6 Photocatalytic degradation of RhB by CQDs/BiPO4 composite (2.4wt%) with different scavengers

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增强可见光吸收和电荷分离的碳量子点/BiPO₄纳米复合材料

Carbon Quantum Dots/BiPO₄ Nanocomposites with Enhanced Visible-light Absorption and Charge Separation

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