BiOCl/g-C3N4 heterojunction catalyst for efficient photocatalytic reduction of CO2 under visible light

HE Zhiqiao; CHEN Jinping; TONG Lili; TANG Juntao; CHEN Jianmeng; SONG Shuang

doi:10.11949/j.issn.0438-1157.20160337

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BiOCl/g-C₃N₄ heterojunction catalyst for efficient photocatalytic reduction of CO₂ under visible light

更新时间：2025-12-10

- BiOCl/g-C₃N₄ heterojunction catalyst for efficient photocatalytic reduction of CO₂ under visible light
- CIESC Journal Issue 11, Pages: 4634-4642(2016)
- 作者机构：
  
  浙江工业大学环境学院,浙江,杭州,310032
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20160337
  CLC： 643
- Online First：05 November 2016，
  
  Published：05 November 2016
- 稿件说明：
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HE Zhiqiao, CHEN Jinping, TONG Lili, et al. BiOCl/g-C₃N₄ heterojunction catalyst for efficient photocatalytic reduction of CO₂ under visible light[J]. CIESC Journal, 2016, (11): 4634-4642. DOI: 10.11949/j.issn.0438-1157.20160337.
DOI：

HE Zhiqiao, CHEN Jinping, TONG Lili, et al. BiOCl/g-C₃N₄ heterojunction catalyst for efficient photocatalytic reduction of CO₂ under visible light[J]. CIESC Journal, 2016, (11): 4634-4642. DOI: 10.11949/j.issn.0438-1157.20160337. DOI：

摘要

以KCl、Bi（NO3）3和类石墨氮化碳（g-C3N4）为前体，采用水热法成功制备了BiOCl/g-C3N4异质结光催化剂，并进行可见光催化还原CO2，考察了催化剂的活性及稳定性，同时研究BiOCl：g-C3N4（摩尔比）、催化剂用量和光照强度对光催化还原CO2的影响。结果表明，在水蒸气的存在下，BiOCl/g-C3N4较纯BiOCl和g-C3N4具有更高的光催化还原CO2活性，在催化剂用量为0.1 g，光照强度为2.413×10-6 einstein·min-1·cm-2，BiOCl：g-C3N4摩尔比为1：1的异质结催化剂显示了最高的光催化还原CO2活性，且可见光催化剂在5次套用实验后其活性基本不变。基于X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）、比表面积测试（BET）和紫外-可见（UV-vis）吸收光谱表征，可以推断BiOCl和g-C3N4之间形成的p-n结能有效分离光生电子和空穴，是增强光催化剂活性的主要原因。

Abstract

BiOCl/g-C3N4 heterojunction catalyst was synthesized by a hydrothermal method using KCl

Bi(NO3)3 and g-C3N4 as precursors

over which the photocatalytic reduction of CO2 under visible light irradiation was conducted. The catalytic activity and the stability during CO2 photoreduction was studied. Moreover

effects of molar ratio of BiOCl to g-C3N4

usage amount of catalyst and illumination intensity on the photocatalytic reduction of CO2 was investigated. It suggests that the BiOCl/g-C3N4 heterojunction catalysts showed much enhanced photocatalytic activities for the reduction of gaseous CO2 with water vapor in comparison with BiOCl and g-C3N4. The BiOCl/g-C3N4 catalyst with molar ratio of 1:1 exhibited the highest photocatalytic activity for CO2 reduction under the optimal conditions of 0.1 g catalyst and 2.413×10-6 einstein·min-1·cm-2 of illumination intensity. Moreover

the catalyst maintained stable performance even after five cycles of test. Techniques of X-ray diffraction

scanning electron microscopy

transmission electron microscopy

X-ray photoelectron spectroscopy

Brunauer-Emmett-Teller analyses and UV-vis absorption spectroscopy were conducted on the catalyst

and it is speculated that the effective separation of photogenerated electrons and holes due to the formation of p-n heterojunctions between BiOCl and g-C3N4 accounted for the improved photocatalytic activities of BiOCl/g-C3N4.

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