Preparation of reduced graphene oxide@Ag2O modified TiO2-based composites and their visible light photocatalytic properties
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摘要: 制备了还原氧化石墨烯(rGO)@Ag2O共同改性TiO2基复合材料(rGO@Ag2O/TiO2),并研究了其可见光催化性能。结果表明,三元复合材料rGO@Ag2O/TiO2的可见光催化性能远优于一元纳米TiO2和二元rGO/TiO2、Ag2O/TiO2复合材料,当可见光照射120 min后,溶液中约100%的罗丹明B分子被rGO@Ag2O/TiO2降解。rGO@Ag2O/TiO2三元复合材料可见光催化效率的提高主要源于窄带隙半导体Ag2O和高电导率材料rGO的引入,使形成的rGO@Ag2O/TiO2三元复合材料具有强的可见光吸收能力和光生电子空穴对分离能力。Abstract: The reduced graphene oxide@Ag2O co-modified TiO2-based composites (rGO@Ag2O/TiO2) were successfully synthesized, whose photocatalytic performance under visible light irradiation were also tested. The ternary rGO@Ag2O/TiO2 composites show much higher visible light photocatalytic activity than the pure TiO2 and rGO/TiO2、Ag2O/TiO2 binary composites, of which almost 100% Rhodamine B (RhB) molecules were decomposed by the rGO@Ag2O/TiO2 composites after 120 min visible light irradiation. Due to the introduction of the narrow gap semiconductor Ag2O and the admirable electron conductivity rGO, so the rGO@Ag2O/TiO2 ternary composites have strong visible light absorption ability and potent separation of electron-holes pairs, the ternary rGO@Ag2O/TiO2 composites show much higher visible light photocatalytic activity.
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Key words:
- reduced graphene oxide /
- Ag2O /
- TiO2 /
- photocatalyst /
- semiconductor /
- heterostructure /
- Rhodamine B
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