Controllable synthesis and photocatalytic performance of Z-scheme In2O3/In2S3 tubular heterojunction with enhanced internal electric field
Constructing heterojunction materials with special morphology and enhanced internal electric field can effectively improve the separation efficiency of photogenerated electron-hole pairs in photocatalysts,thereby enhancing photocatalytic activity.The study used a two-step solvent thermal and calcination process to control the synthesis of Z-scheme In2O3/In2S3 heterojunctions derived from metal-organic frameworks(MOFs).Characterization analysis and photocatalytic degradation experiments were systematically conducted to study the phase,morphology,optical properties and performance of the constructed heterojunctions.The results showed that the tubular In2O3/In2S3 exhibited a strong light absorption response,and the strong internal electric field formed at the interface between In2O3 and In2S3 suppressed the recombination of photogenerated electron-hole pairs.Under visible light irradiation,the In2O3/In2S3 with a mass ratio of 1∶1 demonstrated the most excellent photocatalytic activity,achiev-ing a degradation rate of 68.44%for tetracycline hydrochloride(TCH)within 60 minutes.The reaction kinetic constants were increased by 29.8 times for In2O3 and 3.2 times for In2S3,and the In2O3/In2S3 showed good stability after three cycles.Electrochemical tests and radical trapping experiments indicated that the internal electric field intensity of the In2O3/In2S3 heterojunction was increased by 3.90 times for In2O3 and 2.42 times for In2S3,respectively,and superoxide radicals(·O2-)and holes(h+)were the main active substances in the photocatalytic process.The study provides an effective strategy for the controlled synthesis of high-efficiency photocatalysts with strong internal electric field heterojunctions.
photocatalysisMOFs derivativesIn2O3/In2S3heterojunctioninternal electric field
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