TRMC, XPS, and EPR characterizations of polycrystalline TiO2 porphyrin impregnated powders and their catalytic activity for 4-nitrophenol photodegradation in aqueous suspension
TRMC, XPS, and EPR characterizations of polycrystalline TiO2 porphyrin impregnated powders and their catalytic activity for 4-nitrophenol photodegradation in aqueous suspension
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DOI：
10.1021/jp044253g
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发表时间：
2005-06-30
影响因子：
3.3
通讯作者：
Guascito, MR
中科院分区：
文献类型：
--
作者：
Mele, G;Del Sole, R;Guascito, MR
用时间分辨微波电导率(TRMC)、电子顺磁共振(EPR)和X射线光电子能谱(XPS)表征了多晶二氧化钛裸或卟啉浸渍粉末作为光催化剂降解4-硝基苯酚(4-NP)的水悬浮液。不含金属或铜[5，10，15，20-四(4-叔丁基苯基)]的卟啉敏化剂的存在提高了裸TiO2光催化活性。TRMC测量表明，在大环的存在下，光致过剩载流子的数量和寿命增加，EPR和XPS光谱支持基于光反应性实验的机理假说。
Characterization of polycrystalline TiO2 bare or porphyrin impregnated powders, used as photocatalysts for the degradation of 4-nitrophenol (4-NP) in aqueous suspension, was performed by time-resolved microwave conductivity (TRMC) measurements and electronic paramagnetic resonance (EPR) and X-ray photoelectron (XPS) spectroscopies. The presence of porphyrin sensitizers, as the metal-free or Cu [5,10,15,20- tetra (4-tert-butylphenyl)] porphyrin, impregnated onto the TiO2 surface improved the photocatalytic activity of the bare TiO2. TRMC measurements indicate that the number and lifetime of the photoinduced excess charge carriers increase in the presence of the macrocycles, and EPR and XPS spectroscopies support the mechanistic hypotheses based on the photoreactivity experiments.