Synthesis of ZnO/CdS/Au heterojunction for photocatalytic degradation of formaldehyde at room temperature under visible light
ZnO/CdS/Au heterojunction photocatalysts were synthesized via hydrothermal and chemical bath deposition methods for the removal of low-concentration formaldehyde under visible light at room temperature.The optical and photoelectronic characteristics of the ZnO/CdS/Au heterojunction photocatalyst were systematically investigated utilizing a suite of analytical techniques,including XRD,SEM,TEM,XPS,UV,PL,PEC,EIS,and other complementary methods.The results revealed that the Au-decorated ZnO/CdS exhibited a micrometer-scale flower-like morphology composed of nanorods.The formation of the heterojunction and the plasmonic effect induced by the metal component led to an expansion of the spectral absorption range,suppression of the defect-related luminescence in the semiconductor,and enhancement of light absorption as well as efficient separation and migration of photogenerated electron-hole pairs.The fabricated ZnO/CdS/Au heterojunction photocatalyst demonstrated exceptional performance in the removal of formaldehyde,achieving the reduction of low-mass concentration formaldehyde(1.25 mg·m-3)in a reaction chamber to below 0.025 mg·m-3 within 2 h at room temperature.Moreover,the catalyst retained its activity with negligible degradation after 8 consecutive cycles.Furthermore,this study elucidated the influence of various factors on the removal of formaldehyde,such as the type of catalyst,light wavelength,initial mass concentration of formaldehyde,and relative humidity.A comprehensive discussion of these factors is presented herein.The findings of this research hold significant theoretical implications for the effective abatement of low-concentration formaldehyde at room temperature.
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