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首页> 外文期刊>RSC Advances >Synthesis and enhanced visible light photocatalytic CO2 reduction of BiPO4-BiOBrxI1-x p-n heterojunctions with adjustable energy band
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Synthesis and enhanced visible light photocatalytic CO2 reduction of BiPO4-BiOBrxI1-x p-n heterojunctions with adjustable energy band

机译：合成和增强的可见光光催化CO2减少BIPO4-BIOBRXI1-X P-N异质结的可调节能带

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摘要

A series of novel BiPO4-BiOBrxI1-x p-n heterojunctions were successfully prepared by a facile solvothermal method. The morphology, structure and optical properties of photocatalysts were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and ultraviolet visible diffuse reflectance spectroscopy. The visible light photocatalytic activities of BiPO4-BiOBrxI1-x heterojunctions were investigated by photocatalytically reducing CO2. After 4 hours of irradiation, the 5% BiPO4-BiOBr0.75I0.25 heterojunction showed the highest photocatalytic activity with the yields of CO and CH4 up to 24.9 and 9.4 mol g(cat)(-1) respectively. The improved photocatalytic activity may be due to the formation of BiPO4-BiOBrxI1-x p-n heterojunctions which can effectively restrict the recombination rate of the photoexcited charge carriers. Moreover, the energy band structure of BiPO4-BiOBrxI1-x heterojunctions could be easily adjusted by changing the mole ratio of I and Br. The possible mechanism of the enhancement of the photocatalytic performance was also proposed based on experimental and theoretical analysis. The present study may provide a rational strategy to design highly efficient heterojunctions with an adjustable energy band for environmental treatment and energy conversion.
机译：通过容易的溶剂热法成功制备了一系列新型BIPO4-BioBRXI1-X X X P-N异质条件。通过扫描电子显微镜（SEM），X射线衍射（XRD）和紫外易散射反射光谱，表征光催化剂的形态，结构和光学性质。通过光催化还原CO 2研究了BIPO4-BIOBRXI1-X杂疾病的可见光光催化活性。在4小时照射后，5％BIPO4-BIOBR0.75i0.25异质结分别显示出最高的光催化活性，其优异的CO和CH4高达24.9和9.4mol g（ - 1）。改善的光催化活性可能是由于形成BIPO4-BIOBRXI1-X P-N异质的形成，其能够有效地限制光屏蔽电荷载体的重组率。此外，通过改变I和Br的摩尔比，可以容易地调节BIPO4-Biobrxi1-x杂交能量结构。还提出了基于实验性和理论分析的光催化性能提高的可能机制。本研究可以提供具有可调节能带的高效杂交的合理策略，用于环境处理和能量转换。

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  • 来源
    《RSC Advances》 |2019年第20期|共8页
  • 作者

    Yin Hao Yong; Zheng Yi Fan; Song Xu Chun;

  • 作者单位

    Hangzhou Dianzi Univ Coll Mat &

    Environm Engn Hangzhou 310018 Zhejiang Peoples R China;

    Zhejiang Univ Technol Res Ctr Anal &

    Measurement Hangzhou 310014 Zhejiang Peoples R China;

    Fujian Normal Univ Dept Chem Fuzhou 350007 Fujian Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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