研究目的
Investigating the full-spectrum photocatalytic activity of ZnO/CuO/ZnFe2O4 nanocomposite as a photoFenton-like catalyst for the degradation of organic pollutants under UV, visible, and near-infrared light irradiation.
研究成果
The ZnO/CuO/ZnFe2O4 nanocomposite derived from calcination at 800 °C shows the highest photoFenton-like activity, extending optical absorption to the visible and NIR regions. The presence of H2O2 promotes the separation of photogenerated electrons and holes, conferring the nanocomposite with full-spectrum photocatalytic activity. The nanocomposite is a promising full-spectrum photoFenton-like catalyst for the degradation of organic pollutants.
研究不足
The study focuses on the photocatalytic degradation of methyl orange as a model pollutant. The performance of the ZnO/CuO/ZnFe2O4 nanocomposite with other organic pollutants and under different environmental conditions was not investigated.
1：Experimental Design and Method Selection:
The ZnO/CuO/ZnFe2O4 nanocomposite was prepared by coprecipitation of Zn(NO3)2, Cu(NO3)2 and Fe(NO3)3 with mixed NaOH and Na2CO3 followed by calcination of the coprecipitation product. The molar ratios of Zn2+ to Cu2+ and (Zn2+ + Cu2+) to Fe3+ were both controlled to be 3:
2：Sample Selection and Data Sources:
The precursor for the ZnO/CuO/ZnFe2O4 nanocomposite was synthesized using a coprecipitation method.
3：List of Experimental Equipment and Materials:
A Bruke D8 Advance powder X-ray diffractometer, Hitachi S-4800 field emission scanning electron microscope, JOEL JEM-2100 high-resolution transmission electron microscope, ESCALAB 250 spectrometer, Cary 5000 spectrophotometer, CHI660E electrochemical workstation.
4：Experimental Procedures and Operational Workflow:
The precursor was heated to 800 °C in an electric tubular furnace at a rate of 2 °C min?1 before being calcined for 3 h.
5：Data Analysis Methods:
The XRD patterns, FE-SEM and HR-TEM images, XPS spectra, UV–Vis-NIR DRS, and transient photocurrents were analyzed to characterize the nanocomposite and its photocatalytic activity.
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