Abstract

Hierarchically branched structures have attracted particular attention for the application in photocatalysis owing to their special physicochemical features. But the construction of hierarchical branch semiconductors is usually expensive and complex. In this work, a novel double-sided comb-like fluoride (F⁻) and cerium (Ce³⁺) co-doped monoclinic BiVO₄ macro/nanostructured photocatalyst (BFCe) was successfully prepared through coupling via a facile hydrothermal method and calcination at 500 °C. A possible growth mechanism of the double-sided comb-like monoclinic BiVO₄ was proposed and discussed. Compared with undoped (BVO) and F (BF) and Ce (BCe) single-doped bismuth vanadate, the BFCe sample (the mass ratio of Ce³⁺ to F⁻ was 1:2) exhibited considerably increased photocatalytic performance toward degrading the rhodamine blue dye (94.8%) and water splitting (O₂ evolution was 338.59 μmol/g). Experimental results showed that the F⁻ and Ce³⁺ doping expands the visible light absorbance while enhancing the specific surface area. Thus, the double doping of F⁻ and Ce³⁺ provided a synergistic effect, resulting in optimized photocatalytic decomposition efficiency, as corroborated by luminescence spectroscopy measurements. This work can serve as a useful guide for the engineering design of novel micro/nanomaterial with an increased catalytic performance for various applications.

Graphical abstract

中文翻译：

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双面梳状F / Ce共掺杂BiVO 4微/纳米结构的制备，以增强光催化降解和水氧化作用

摘要

分层分支的结构由于其特殊的物理化学特征而在光催化中的应用引起了特别的关注。但是，分层分支半导体的构造通常是昂贵且复杂的。在这项工作中，一种新颖的双面梳状氟化物（F ^- ）和铈（Ce ³⁺）共掺杂的单斜BiVO ₄宏/纳米结构的光催化剂（BFCe）通过耦合经由一个浅显的水热法和煅烧在成功地制备了500℃。提出并讨论了双面梳状单斜BiVO ₄的可能生长机理。与未掺杂（BVO）和F（BF）和Ce（BCe）单掺杂钒酸铋相比，BFCe样品（Ce ³⁺的质量比到F ^-为1：2）显示出显着地朝向降低罗丹明蓝色染料（94.8％）和水分解（O提高的光催化性能₂演变为338.59微摩尔/克）。实验结果表明，在F ^-和Ce ³⁺掺杂扩展可见光吸光度，同时提高比表面积。因此，F的双掺杂^-和Ce ³⁺提供了协同效应，从而提供优化的光催化分解的效率，证实了通过发光光谱测量。这项工作可以为新型微/纳米材料的工程设计提供有用的指导，并为各种应用提高催化性能。