Sol-gel template synthesis of mesoporous carbon-doped TiO2 with photocatalytic activity under visible light
authors Ovodok, E; Maltanava, H; Poznyak, S; Ivanovskaya, M; Kudlash, A; Scharnagl, N; Tedim, J
nationality International
author keywords Carbon-doped; Mesoporous materials; Photocatalysis; Sol gel; Titanium dioxide
abstract Mesoporous TiO2 powders with an anatase framework were synthesized through surfactant-assisted template method. The concentrated titania sol (7-8 wt.%) prepared from TiCl4 as a precursor was used in this synthesis. The soluble triblock copolymer Pluronic F127 was employed as a structure-directing agent and a carbon precursor to fabricate the carbon-doped mesoporous titania. The synthesized powders were characterized by XRD, HRTEM, Raman spectroscopy, UV-Vis reflectance spectroscopy, N2 adsorption/desorption and TG/DSC methods. The mesoporous titania annealed at 350C was shown to have a high specific surface area up to 192 m2/g and a narrow pore size distribution. After annealing, carbon species in graphitic form were detected in the template-prepared TiO2 samples using Raman spectroscopy measurements. The photocatalytic performance of the samples was characterized in the process of Rhodamine B decomposition under visible light irradiation. The enhanced visible light photocatalytic efficiency of the template-prepared TiO2 powders as compared with that of Degussa P25 can be attributed to the associated effects of high specific surface area, pure anatase crystalline structure and carbon doping. 2017 Elsevier Ltd.
publisher Elsevier Ltd
year published 2018
volume 5
issue 9
beginning page 17422
ending page 17430
digital object identifier (doi) 10.1016/j.matpr.2018.06.044
unique article identifier 2-s2.0-85054955272