研究目的
Investigating the effect of pH value on the composition, structure, and photocatalytic properties of bismuth vanadate (BiVO4) synthesized via hydrothermal method.
研究成果
The pH of the precursor solution significantly influences the composition, morphology, and photocatalytic activity of hydrothermally synthesized BiVO4. Optimal photocatalytic performance is achieved at pH 5 with 84.7% degradation of methylene blue after 240 minutes, following first-order kinetics. Future studies could focus on optimizing synthesis conditions and applying to other pollutants.
研究不足
The study is limited to specific pH ranges and hydrothermal conditions; potential optimizations could include varying other synthesis parameters like temperature or time, and exploring broader pH values or different contaminants for photocatalytic evaluation.
1：Experimental Design and Method Selection:
Hydrothermal synthesis method was used to prepare BiVO4 powders, with pH adjustment using NaOH and HNO3 to study its effects on product properties.
2：Sample Selection and Data Sources:
Samples were synthesized at pH values of 3, 5, 7, 9, 11, and 13 using analytical pure reagents and deionized water.
3：List of Experimental Equipment and Materials:
Materials include Bi(NO3)3·5H2O, NH4VO3, NaOH, HNO3, deionized water. Equipment includes Teflon-stainless steel autoclave, magnetic stirrer, drying oven, X-ray diffraction instrument (Brucker/D8-Advance), field emission scanning microscopy (JEOL JSM-6700LV), UV-Vis spectrophotometer (Shimadzu UV-2550), high-pressure mercury lamp (250 W), 721 spectrophotometer.
4：Experimental Procedures and Operational Workflow:
Dissolve raw materials, adjust pH, transfer to autoclave, heat at 140°C for 20 h, wash and dry the product, characterize using XRD, SEM, UV-Vis, and evaluate photocatalytic activity by degrading methylene blue under light irradiation with periodic sampling and absorbance measurement.
5：Data Analysis Methods:
XRD for crystal structure analysis, SEM for morphology, UV-Vis for reflectance spectra, and first-order kinetic analysis for photocatalytic degradation rates using correlation coefficients and rate constants.
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