研究目的
Investigating the photoelectrochemical properties of n-type Ba2TiO4, prepared by nitrate route, and its application in the electro-photocatalytic mineralization of phenobarbital under solar light.
研究成果
The study successfully synthesized and characterized the double perovskite Ba2TiO4, demonstrating its potential for environmental protection through the electro-photocatalytic mineralization of phenobarbital under solar light. The photoelectrochemical properties of Ba2TiO4 were favorable for water purification under UV light, with a conversion rate improvement up to 66% achieved by electro-photocatalysis. The oxidation of phenobarbital followed a first-order kinetic, suggesting a promising application of Ba2TiO4 in wastewater treatment.
研究不足
The electrical conductivity of Ba2TiO4 is weak, indicating a weak doping and a large space charge region, which could limit its efficiency in photocatalysis. The study also mentions that Ba2TiO4 cannot support high electric currents, which may restrict its application in certain electro-photocatalytic processes.
1：Experimental Design and Method Selection:
The perovskite Ba2TiO4 was elaborated by chemical route from nitrates decomposition. The oxide was characterized by scanning electron microscopy, diffuse reflectance, and photo-electrochemistry.
2：Sample Selection and Data Sources:
Stochiometric amounts of BaCO3 and TiO2 were dissolved in HNO3, evaporated on a hot plate, and denitri?ed at 400 °C. The amorphous powder was ground, pressed into pellets, and sintered at 1040 °C.
3：List of Experimental Equipment and Materials:
XRD (Cu kα radiation), SEM (Microscope Jeol 6510 L V), particle size analyzer (Mastesizer 3600, Malvern Instruments), UV–vis spectrophotometer (Specord 200 Plus), d.c. conductivity measurement setup, PGZ301 potentiostat / galvanostat (Radiometer analytical), DAZHENG DC power supply PS-305D.
4：5D.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The powder morphology was visualized by SEM. The optical gap was determined from the diffuse reflectance. The d.c. conductivity was recorded on sintered pellets. The photo-electrochemical characterization was carried out in a conventional cell with a saturated calomel electrode and Pt counter electrode.
5：Data Analysis Methods:
The electrical conductivity was analyzed following an exponential law. The optical gap was determined using the Pankov relation. The electro-kinetic parameters were derived from the semi-logarithmic plot of the intensity-potential characteristics.
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