Multifunctional photocatalyst obtained by composite modification of CoAl-LDH two-dimensional hexagonal nanosheets and CdS nanoparticles
Developing integrated photocatalysts with multifunction in energy conversion and environmental im-provement is an effective strategy for promoting solar-to-chemical application under the dual challenges of ener-gy crisis and environmental pollution.Herein,this work uses hexagonal CoAl-LDH nanosheets as carriers and constructs a type Ⅱ heterojunction of CoAl-LDH/CdS by in-situ growth of CdS nanoparticles.By utilizing the broad absorption and excellent carrier properties of CoAl-LDH nanosheets in the visible light region,combined with the high optical quantum yield of CdS,and through the construction of heterostructures,a multifunctional CoAl-LDH/CdS composite photocatalytic material is obtained.Moreover,by optimizing the loading amount of CdS,the photodegradation rate of the photocatalyst with a mass ratio of CoAl-LDH/CdS-2 is the highest(deg-radation rate=88.48％at t=60 minutes),which is 1.18 times and 8.62 times higher than that of CdS and CoAl-LDH monomers,respectively.Meanwhile,the highest CO production of CoAl-LDH/CdS-1 is 39.02 mol/g(t=5 h),which is 4.2 and 2.5 times of bare CoAl-LDH and bare CdS,respectively.These results are mainly attrib-uted to the construction of a tight heterojunction between CoAl-LDH nanosheets and CdS nanoparticles in com-posite,and the rich coupling interface greatly reduces the recombination rate of photogenerated carriers.This provides a theoretical basis for the development of multifunctional photocatalysts.
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