Dual synergetic effects of carbon-surface coating and cerium doping on photocatalytic activity of TiO2 in degradation of chromotrope 2R

Autor: Mengxiong Zeng, Youji Li, YanChun Wang, Wei Chen, Shidong Qin
Rok vydání: 2013
Předmět:
Zdroj: Science China Chemistry.
ISSN: 1869-1870
1674-7291
DOI: 10.1007/s11426-012-4785-5
Popis: Ce-doped TiO2 coated on carbon surface (Ce-TiO2/Cs, CTCs) was prepared by the supercritical pretreatment and sol-gelcoated-calcination method. The CTCs was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectrometry (XPS), nitrogen adsorption. Photocatalytic activity was evaluated by using chromotrope 2R (CR) as a model pollutant in water. The results show that the CTCs has higher surface areas and smaller crystalline size than Ce-TiO2 coated carbon due to Ce-TiO2 nanoparticles only coated carbon surface. The CTCs shows the highest photoactivity among all catalysts, such as pure TiO2, P25, Ce-TiO2 (CT), TiO2/C (TC) and Ce-TiO2/C (CTC). The dual synergetic effects of CTC or CTCs are more than the single synergetic effect of TC or CT in CR degradation process because coexistence of the carbon and Ce ion has the further enlarging effect on improving the photoactivity of TiO2. Meanwhile, the dual synergetic effects are higher than the sum of the single synergetic effects of CT and TC.Fuerthermore, the dual synergetic effects further increases from 8.0 (CTC) to 12.4 (CTCs) by supercritical pretreatment of carbon. A mechanism for the enhanced reactivity is proposed in which dual synergetic effects significantly impact TiO2 photoactivity by supercritical pretreatment of carbon substrate as a result of an optimal CTCs arrangement that shows higher photoactivity than CTC.
Databáze: OpenAIRE
Externí odkaz: