Rational synthesis of BixFe1-xVO4 heterostructures impregnated sulfur-doped g-C3N4: A visible-light-driven type-II heterojunction photo (electro)catalyst for efficient photodegradation of roxarsone and photoelectrochemical OER reactions
Rational synthesis of BixFe1-xVO4 heterostructures impregnated sulfur-doped g-C3N4: A visible-light-driven type-II heterojunction photo (electro)catalyst for efficient photodegradation of roxarsone and photoelectrochemical OER reactions
复制标题
DOI：
10.1016/j.apcatb.2021.120852
复制
发表时间：
2022-01-06
影响因子：
22.1
通讯作者：
Yang, Thomas C. -K.
中科院分区：
文献类型：
--
作者：
Balu, Sridharan;Chen, Yi-Lun;Yang, Thomas C. -K.
金属钒酸盐（MVO4）和石墨氮化碳（g-C3N4）半导体材料因其优异的物理化学和光催化性能而受到人们的广泛关注。本研究以不同比例（x = 0.7; 0.5; 0.3）混合阳离子前驱体（Bi和Fe），通过简单的一锅水热法制备BixFe(1_ x)VO(4)，并将其浸渍在硫掺杂的g-C3N4（SCN）表面，以获得大范围的太阳吸收和有效的电荷分离。采用多种光谱学技术分析了合成光催化剂的物理化学和光电子性质。通过光电化学析氧反应（OER）和光降解roxarsone （ROX）评价了合成光催化剂的光催化活性。本工作旨在研究BixFe1-xVO4/SCN光催化纳米复合材料的形成、光催化性能及其合理机理。在不同BixFe(1_ x)VO(4) （x = 0.7; 0.5; 0.3）中，BixFe(1_ x)VO(4)/SCN （Bi/Fe = 0.5）纳米复合材料在可见光照射下，90 min内ROX的光降解率为85.66%。纳米复合材料的光催化性能分别比原始g-C3N4、BiVO4和FeVO4样品高2.49倍、2.87倍和3.48倍。电化学OER结果表明，BixFe(1_ x)VO(4)/SCN （0.987 mA cm(-2)）纳米复合材料在1.23 V （vs NHE）下具有较高的光电流密度，分别是CN （0.059 mA cm(-2)）、BiVO4 （0.193 mA cm(-2)）和FeVO4 （0.160 mA cm(-2)）的16.73、5.11和6.16倍。XPS和光电化学（PEC）分析表明，BixFe(1_ x)VO(4)纳米复合材料具有较高的给体密度（ND）和优异的电荷分离性能。
Metal vanadate (MVO4) and graphitic carbon nitride (g-C3N4) semiconductor materials have attracted much interest due to their tremendous physicochemical and photocatalytic performances. In this prospect, BixFe(1_ x)VO(4) were prepared by mixing cation precursors (Bi and Fe) in different proportions (x = 0.7; 0.5; 0.3) via a simple one-pot hydrothermal route and impregnated on the surface of sulfur-doped g-C3N4(SCN) to attain a wide range of solar absorption and effective charge separation. Several spectroscopic techniques were used to analyze the physicochemical and optoelectronic properties of as-synthesized photocatalysts. The photocatalytic activities of as-synthesized photocatalysts were evaluated by photoelectrochemical oxygen evolution reactions (OER) and photodegradation of roxarsone (ROX). This work aims to investigate the formation, photocatalytic performance, and rational mechanism of BixFe1-xVO4/SCN photocatalytic nanocomposites. Among different BixFe(1_ x)VO(4) (x = 0.7; 0.5; 0.3), the BixFe(1_ x)VO(4)/SCN (Bi/Fe = 0.5) nanocomposite results in 85.66% of ROX photodegradation within 90 mins under visible-light irradiation. The photocatalytic performance of the nanocomposite is about 2.49, 2.87, 3.48 folds higher than that of pristine g-C3N4, BiVO4, and FeVO4 samples, respectively. The photo electrochemical OER results suggest the higher photocurrent density at 1.23 V (vs NHE) was achieved by BixFe(1_ x)VO(4)/SCN (0.987 mA cm(-2)) nanocomposite, and which is 16.73, 5.11, and 6.16 times higher than that of CN (0.059 mA cm(-2)), BiVO4 (0.193 mA cm(-2)), and FeVO4 (0.160 mA cm(-2)), respectively. The XPS and photo electrochemical (PEC) analysis depict the higher donor densities (ND) and excellent charge separations through type-II heterojunction of the BixFe(1_ x)VO(4) nanocomposite.