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苝二酰亚胺(PTCDI)是一种n型半导体材料,在可见光区有很强的吸收,广泛用于有机光伏器件领域的研究.以PTCDI为光敏剂制备TiO2可见光光催化剂用以降解环境污染物的研究还鲜有报道.本文采用水热法制备苝二酰亚胺(PTCDI)和四磺酸酞菁铜(CuPcTs)敏化的TiO2复合样品.利用XRD、TEM、UV-Vis和荧光光谱对复合样品进行表面形貌和结构表征,以可见光光催化降解罗丹明B为模型反应.研究结果表明,染料敏化能够有效地拓宽样品的吸收光谱范围,提高可见光光催化活性;电子收集型的共敏化复合样品体现出了优于单一染料敏化样品的光催化活性.应用能带结构理论,阐明了单一染料敏化和共敏化样品的光生电子转移机制.
Perylene diimide (PTCDI) is an n-type semiconductor material with strong absorption in the visible region and is widely used in the field of organic photovoltaic devices. PTCDI is used as a photosensitizer to prepare TiO2 visible light photocatalyst to degrade environmental pollution However, few studies have been reported on this topic.In this paper, PTCDI and CuPcTs-sensitized TiO2 composite samples were prepared by hydrothermal method.Using XRD, TEM, UV-Vis and fluorescence spectroscopy The surface morphology and structure of the composite samples were characterized by visible light photocatalytic degradation of rhodamine B as a model reaction.The results show that the dye sensitization can effectively broaden the absorption spectrum of the sample to improve the visible light photocatalytic activity; electron collection The co-sensitized composite samples showed better photocatalytic activity than single dye-sensitized samples.The mechanism of photogenerated electron transfer of single dye-sensitized and co-sensitized samples was demonstrated using the band structure theory.