Hierarchical bismuth vanadate/reduced graphene oxide composite photocatalyst for hydrogen evolution and bisphenol A degradation
Hierarchical bismuth vanadate/reduced graphene oxide composite photocatalyst for hydrogen evolution and bisphenol A degradation
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DOI：
10.1016/j.apmt.2021.100963
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发表时间：
2021-02-11
影响因子：
8.3
通讯作者：
Lee, Adam F.
中科院分区：
文献类型：
--
作者：
Sekar, Karthikeyan;Kassam, Ahmed;Lee, Adam F.
钒酸铋（BiVO 4）是一种广泛研究的光催化剂，用于污染废水的净化，水分解制氢和有机合成。BiVO 4的光物理性质对形貌和量子限制效应敏感，在石墨烯纳米复合材料中表现出更好的光催化性能。采用乙醇胺和聚乙二醇作为稳定剂，通过一锅法合成了BiVO 4纳米颗粒修饰的BiVO 4层状结构，并与还原氧化石墨烯（RGO）进行了接触.与单组分h-BiVO 4或μ m大小的块状BiVO 4形态相比，所得h-BiVO 4/RGO光催化剂在可见光照射下对双酚A（BPA）降解和析氢表现出上级的光活性。BPA的光催化降解速率和表观量子效率（AQE）按h-BiVO 4/RGO的顺序降低（4.5 x 10（-2）mmol.g（-1）.min（-1）; 15.1% AQE）> h-BiVO4（3.5 × 10（-2）mmol.g（-1）.min（-1）; 11.7%AQE）> BiVO 4（1 × 10（-2）mmol.g（-1）.min（-1）; 3.4%AQE），表示h-BiVO 4/RGO相对于BiVO 4的4.5倍增强。液相光降解产物包括苯二醇、环己二烯二酮和（2 Z）丁二酸。在可见光下，h-BiVO 4/RGO的光催化产氢速率为11.5 μ mol.g（-1）.h（-1），比BiVO 4（0.03 μ mol.g（-1）.h（-1））大383.3倍。h-BiVO 4/RGO的上级光催化性能主要归因于其更高的表面积，通过增强的可见光吸收和电荷分离穿过光催化剂-RGO界面，这两者一起赋予光激发的电荷载流子更高的密度和寿命。(C)2021爱思唯尔有限公司保留所有权利。
Bismuth vanadate (BiVO4) is a widely studied photocatalyst for the depollution of contaminated wastewater, production of hydrogen by water splitting, and organic synthesis. The photophysical properties of BiVO4 are sensitive to morphology and quantum confinement effects, and can exhibit enhanced photocatalytic performance in nanocomposites with graphene. Synthesis of hierarchical BiVO4 plates decorated by nanoparticles (h-BiVO4) in contact with reduced graphene oxide (RGO) is reported via a facile one-pot solution phase approach using ethanolamine and a polyethylene glycol stabilizer. The resulting h-BiVO4/RGO photocatalyst exhibited superior photoactivity for bisphenol A (BPA) degradation and hydrogen evolution under visible light irradiation compared to single component h-BiVO4 or a mu m-sized block-like BiVO4 morphology. Rates of BPA photocatalytic degradation and apparent quantum efficiency (AQE) decreased in the order h-BiVO4/RGO (4.5 x 10(-2) mmol.g(-1).min(-1); 15.1% AQE) > h-BiVO4 (3.5 x 10(-2) mmol.g(-1).min(-1); 11.7% AQE) > BiVO4 (1 x 10(-2) mmol.g(-1).min(-1); 3.4% AQE), representing a 4.5 fold enhancement for h-BiVO4/RGO versus BiVO4. Liquid phase photodegradation products included benzene-1,4-diol, cyclohexa-2,5-diene-1,4-dione and (2Z)-but-2-enedioic acid. The rate of photocatalytic hydrogen production under visible light was 11.5 mu mol.g(-1).h(-1) for h-BiVO4/RGO, similar to 383.3 times greater than for BiVO4 (0.03 mu mol.g(-1).h(-1)). The superior photocatalytic performance of h-BiVO4/RGO is largely attributed to its higher surface area, aided by enhanced visible light absorption and charge separation across the semiconductor-RGO interface, which together confer a higher density and lifetime of photoexcited charge carriers. (C) 2021 Elsevier Ltd. All rights reserved.