研究目的
Investigating the enhanced photocatalytic activity of WO3/g-C3N4 heterostructure for the degradation of methyl orange (MO) and identifying the key reactive oxygen species involved in the process.
研究成果
The WO3/g-C3N4 nanocomposite prepared by a simple direct precipitation method exhibited enhanced photocatalytic activity for the degradation of methyl orange. The ?O2 ? radicals were identified as the key reactive species in the photocatalytic oxidation process. A Z-scheme photocatalytic mechanism was proposed to explain the enhanced activity, which involves the efficient separation of photogenerated electrons and holes and the preservation of strong redox ability.
研究不足
The study focuses on the photocatalytic degradation of methyl orange and may not be directly applicable to other pollutants. The scalability and practical application of the WO3/g-C3N4 photocatalyst under natural sunlight conditions were not explored.
1：Experimental Design and Method Selection:
The study involved the preparation of WO3 nanosheets and WO3/g-C3N4 nanocomposite via a simple direct precipitation method. The photocatalytic activity was evaluated under LED-light illumination.
2：Sample Selection and Data Sources:
Methyl orange (MO) was used as the model pollutant. The reactive oxygen species were identified using trapping experiments and NBT probing method.
3：List of Experimental Equipment and Materials:
Sodium oleate (NaOA), HNO3 solution, Na2WO4 solution, guanidine hydrochloride, NH4Cl, ammonium oxalate (AO), benzoquinone (BQ), isopropanol (IPA), and nitroblue tetrazolium (NBT) were used. A TU-1810 UV-vis spectrophotometer was used for analysis.
4：Experimental Procedures and Operational Workflow:
The preparation of materials, photocatalytic degradation experiments, and analysis of reactive oxygen species were conducted as described.
5：Data Analysis Methods:
The concentration of ?O2 ? was determined using the NBT probing method, and the photocatalytic mechanism was analyzed based on the experimental results.
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