SILAR preparation of ZnS@CdS/HAP composite microspheres and their photocatalytic capacity
Hollow hydroxyapatite(HAP)microspheres prepared using yeast template method were used as substrates for the preparation of ZnS@CdS/HAP composite microspheres through the successive ionic layer adsorption reaction(SILAR)method.The crystal structure,micro morphology,and light absorption capabilities of the materials were analyzed using XRD,SEM,UV-vis characterization techniques.Additionally,the photocatalytic mechanism of the composite microspheres was investigated through methylene blue photocatalytic degradation experiments.ZnS@CdS/HAP composite microspheres were successfully prepared using the SILAR method.The ZnS@CdS/HAP composite microspheres had a diameter of about 3～5 pm and showed good dispersibility.They exhibited excellent absorption performance in the visible light region and high photocatalytic activity.Under the conditions of 1g/L catalyst addition,pH=7,and 25℃,the removal rate of the 50mL methylene blue solution with a concentration of 10mg/L reached up to 93％after 100min of visible light photocatalysis.The mechanism analysis confirmed that the Z-scheme charge transfer mechanism possibly existing in ZnS@CdS/HAP effectively inhibited the recombination of photogenerated carriers and the occurrence of photocorrosion,thereby enhancing the photocatalytic activity and stability of the ZnS@CdS/HAP composite microspheres.
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维普
