Carbon quantum dots-modified Z-scheme Bi12O17Cl2/NiAl-LDH for significantly boosting photocatalytic CO2 reduction

Rui-Tang Guo; Zhe-Xu Bi; Zhi-Dong Lin; Xing Hu; Juan Wang; Xin Chen; Wei-Guo Pan

doi:10.1016/j.jcis.2022.07.078

Carbon quantum dots-modified Z-scheme Bi₁₂O₁₇Cl₂/NiAl-LDH for significantly boosting photocatalytic CO₂ reduction

J Colloid Interface Sci. 2022 Dec:627:343-354. doi: 10.1016/j.jcis.2022.07.078. Epub 2022 Jul 16.

Authors

Rui-Tang Guo¹, Zhe-Xu Bi², Zhi-Dong Lin², Xing Hu², Juan Wang², Xin Chen², Wei-Guo Pan³

Affiliations

¹ College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, China; Shanghai Non-Carbon Energy Conversion and Utilization Institute, Shanghai, China. Electronic address: grta@zju.edu.cn.
² College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, China.
³ College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, China; Shanghai Non-Carbon Energy Conversion and Utilization Institute, Shanghai, China.

PMID: 35863193
DOI: 10.1016/j.jcis.2022.07.078

Abstract

Photocatalytic reduction of CO₂ to high-energy products is an effective way to utilize solar energy and mitigate the greenhouse effect. In this paper, a series of CQDs/Bi₁₂O₁₇Cl₂/NiAl-LDH (C/BOC/LDH) photocatalysts were prepared via a one-pot hydrothermal method, demonstrated excellent photocatalytic CO₂ reduction performance. In the case of only water without any photosensitizer and sacrificial agent, the CO production rate on C/0.3BOC/LDH reached 16.4 μmol·g^-1h^-1, which is 6.7 times higher than that of the original LDH. The construction of Z-scheme heterojunctions inhibited the recombination of electrons with holes. The unique up-conversion PL behavior of CQDs benefitted the absorption of energy in the NIR by the photocatalyst. This study provides meaningful assistance for the design and construction of a ternary photocatalytic system with Z-scheme heterojunction and carbon-based co-catalyst.

Keywords: Bi(12)O(17)Cl(2); Carbon quantum dots; Layered double hydroxide (LDH); Photocatalytic CO(2) reduction; Up-conversion.