Current Applied Physics, Vol.14, No.3, 300-305, 2014
Synergetic effects of hydrophilic surface modification and N-doping for visible light response on photocatalytic activity of TiO2
We made attempts to improve photocatalytic activity of TiO2 nanoparticles under visible light exposure by combining additional treatments. N-doping of TiO2 by ammonia gas treatment increased absorbance of visible light. By coating thin film of polydimethylsiloxane, and subsequently vacuum-annealing, TiO2 surface became more hydrophilic, thereby enhancing photocatalytic activity of TiO2. These two treatments were combined for the first time in this work and photocatalytic activity under visible light irradiation exceeded sum of individual effects of N-doping and hydrophilic modification. (C) 2014 Elsevier B. V. All rights reserved.
Keywords:Visible-light-responsive photocatalyst;Modified TiO2;N-doping;Hydrophilic-modification;Degradation of methylene blue