Author(s): Ovodok, Evgeni ; Maltanava, Hanna ; Poznyak, Sergey ; Ivanovskaya, Maria ; Kudlash, Alexander ; Scharnagl, Nico ; Tedim, João
Date: 2018
Persistent ID: http://hdl.handle.net/10773/24934
Origin: RIA - Repositório Institucional da Universidade de Aveiro
Subject(s): Titanium dioxide; Mesoporous materials; Sol-gel; Carbon-doped; Photocatalysis
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 350° C 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.
