Simultaneous Cr(VI) reduction and bisphenol A degradation by a 3D Z-scheme Bi2S3-BiVO4 graphene aerogel under visible light
Simultaneous Cr(VI) reduction and bisphenol A degradation by a 3D Z-scheme Bi2S3-BiVO4 graphene aerogel under visible light
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DOI：
10.1016/j.cej.2019.123256
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发表时间：
2020-03
影响因子：
15.1
通讯作者：
Qianwei Liang;Sittipranee Ploychompoo;Jingda Chen;Tingting Zhou;Hanjin Luo
中科院分区：
文献类型：
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作者：
Qianwei Liang;Sittipranee Ploychompoo;Jingda Chen;Tingting Zhou;Hanjin Luo
合理的设计策略和简便的合成方法是高效、稳定的光催化剂对环境污染物去除的一个重要挑战。采用水热法制备了Bi 2S 3-BiVO 4石墨烯气凝胶（SVGA），制备了含Bi 2S 3和BiVO 4的三维全固态Z型异质结光催化体系.实验结果表明，SVGA在可见光照射下，通过吸附和光催化的协同作用，可以同时去除水中的Cr（VI）和双酚A（BPA）。在可见光（λ > 420 nm）下，吸附40 min和振荡120 min后，Cr（VI）和BPA的去除率均接近100%，远优于单独的Bi 2S 3和BiVO 4以及Bi 2S 3石墨烯气凝胶（SGA）和BiVO 4石墨烯气凝胶（VGA）样品的去除率。rGO作为Bi 2S 3和BiVO 4之间光生电子转移介体发挥了重要作用，提高了光生电子转移效率，有效增强了SVGA的光催化能力。SVGA负载后可将有害的Cr（VI）转化为低毒的Cr（III），BPA降解为CO2和H2O，且稳定性良好，在实际水样中的应用效果令人满意，表明该光催化剂在水环境中重金属和有机物的同时去除方面具有良好的应用前景。
Rational design strategy and facile synthesis method of photocatalysts with high efficiency and stability have been still a significant challenge for the removal of environmental contaminants. In this study, a three dimensional (3D) all-solid-state Z-scheme heterojunction photocatalytic system containing bismuth sulphide (Bi2S3) and bismuth vanadate (BiVO4) was constructed as Bi2S3-BiVO4graphene aerogel (SVGA) by a facile hydrothermal method. The potential application of as-synthesized SVGA was demonstrated to remove Cr(VI) and bisphenol A (BPA) simultaneously in aqueous media via the synergy of adsorption and photocatalysis under visible light irradiation. The removal rates of Cr(VI) and BPA both nearly reached 100% after adsorption for 40 min and photocatalysis for 120 min under visible light (λ > 420 nm), which was much better than the removal efficiency of individual Bi2S3and BiVO4, as well as Bi2S3graphene aerogel (SGA) and BiVO4graphene aerogel (VGA) samples. The rGO played an important role as photoinduced electron transfer mediator between Bi2S3and BiVO4, which promoted the photogenerated electrons transfer efficiency and enhanced photocatalytic ability of SVGA efficiently. The harmful Cr(VI) was conserved into hypotoxic Cr(III) and BPA was degraded into CO2and H2O after photocatalysis on SVGA, and the fabricated SVGA also presented favorable stability and satisfactory application effect in practical water samples, implied that such photocatalyst has a promising application for simultaneous removal of heavy metals and organics from aqueous environment.