Highly-interspersed biomass-derived carbon quantum dots onto floral CoAl-LDH for significantly enhanced CO2 photoreduction into CO and CH4

被引:17
作者
Li, Jia [1 ]
Gao, Ge [2 ]
Liu, Yang [1 ]
Li, Yang [2 ]
Liu, Zhi [2 ]
机构
[1] Jilin Normal Univ, Coll Chem, Siping 136000, Jilin, Peoples R China
[2] Shantou Univ, Coll Sci, Dept Chem, Shantou 515063, Guangdong, Peoples R China
基金
中国国家自然科学基金;
关键词
CoAl-LDH; Biomass; Carbon quantum dots; CO2; photoreduction; LAYERED DOUBLE HYDROXIDE; HETEROJUNCTION; PERFORMANCE; EFFICIENCY; NITRIDE;
D O I
10.1016/j.jcou.2022.102257
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Stimulating photocatalytic activity of layered double hydroxides (LDHs) have been being as a research hotspot in photocatalysis. Quantum dots doping is a well acknowledged strategy to utilize their photoelectric superiorities to overcome the intrinsic defects of pristine LDHs. In this work, waste biomass-derived carbon quantum dots (B-CQDs)-interspersed CoAl-LDH photocatalysts (B/CALs) are successfully prepared by means of a simple hydro-thermal method from green and renewable points of view. The introduction of B-CQDs significantly broadens the light absorption range and capacity of CoAl-LDH. As the terminal electron acceptor, the highly-dispersed B-CQDs can effectively prolong the lifetime of photogenerated charge carriers and promote the separation of photo-generated electron-hole pairs. No assistance from any sacrificial agent, the optimal sample of B/CAL-2 exhibits significantly enhanced photoreduction activity of CO2-to-CO and CH4, 6.4-and 7.5-fold higher than those of the pristine CoAl-LDH, respectively, and also surpassing many reported high-level LDHs counterparts. Such an un-complicated case guides a green and feasible route to modify semiconductor materials with renewable biomass, which is expected to be applied to others for enhanced photocatalytic activity.
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页数:10
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