研究目的
Enhancing the photocatalytic activity of ZnO by using tourmaline to address the rapid recombination of photo-induced electron-hole pairs and improve quantum efficiency for applications in energy transformation and environmental remediation.
研究成果
The ZnO/tourmaline composite synthesized via precipitation-hydrothermal method exhibits enhanced photocatalytic activity due to increased specific surface area, good interaction between components, and effective separation of electron-hole pairs facilitated by tourmaline's electric field. It shows high stability and reusability, indicating potential for practical applications in photocatalysis using earth-abundant materials.
研究不足
The study is limited to laboratory-scale synthesis and testing; scalability and long-term stability in real-world environmental conditions were not extensively evaluated. The use of a specific model pollutant (methylene blue) may not represent all organic contaminants, and the mechanism relies on the properties of tourmaline, which could vary with mineral source.
1：Experimental Design and Method Selection:
A precipitation-hydrothermal method was used to synthesize ZnO/tourmaline composites with varying weight ratios and synthesis temperatures to optimize photocatalytic performance.
2：Sample Selection and Data Sources:
Tourmaline powder and zinc acetate dihydrate were used as precursors; methylene blue (MB) aqueous solution served as the model pollutant for degradation studies.
3：List of Experimental Equipment and Materials:
Equipment included XRD (ARL SCINTAG X’TRA), SEM (MIRA3), TEM (Titan G2 60-300), XPS (ESCALAB 250Xi), UV-vis spectrophotometer (UV-2550), PL spectrophotometer (F-4500), surface area analyzer (ASAP 2020), and a 300 W Xe lamp. Materials included tourmaline powder, (CH3COO)2Zn·2H2O, NaOH, and deionized water.
4：Experimental Procedures and Operational Workflow:
Tourmaline was dispersed in water, sonicated, mixed with zinc acetate solution, NaOH was added dropwise, the mixture was hydrothermally treated at 160°C for 6 hours, products were rinsed and dried. Photocatalytic activity was measured by degrading MB under Xe lamp illumination, with absorbance monitored every 20 minutes.
5：Data Analysis Methods:
XRD for phase identification, SEM/TEM for morphology, XPS for chemical states, UV-vis for optical properties, BET for surface area, PL for recombination levels, and degradation rates calculated from absorbance measurements.
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