Effect of nitrogen-plasma surface treatment to the enhancement of TiO2 photocatalytic activity under visible light irradiation

CTAB-assisted hydrothermal synthesis of silver vanadates and their photocatalytic characterization

“…Photoactivity for the gaseous isopropanol (IPA) was tested in a continuous-flow annular photoreactor (Huang et al, 2007) containing ca. 0.05 g of photocatalyst evenly spread on a Pyrex tube.…”

Synthesis of nanometer-size Bi3TaO7 and its visible-light photocatalytic activity for the degradation of a 4BS dye

“…The enhanced hydrophilicity of the as-prepared samples could also be attributed to more oxygen vacancies, which was considered to be beneficial to the photoactivity of the catalyst [48]. Huang et al [49] reported that the thermal N 2 -plasma method was shown to modify the surface of TiO 2 by the introduction of oxygen vacancies. Their experimental results confirmed the enhanced photocatalytic activities of treated TiO 2 were not due to the contribution of the doped nitrogen atoms but to the oxygen vacancies, which lead to the increase in visible absorption.…”

Synthesis and Catalytic Applications of Non-Metal Doped Mesoporous Titania

“…Hydrogen, boron, carbon, nitrogen, fluorine, iodine, sulfur, and phosphorus have been used in this capacity, but nitrogen has been studied most extensively. Until now, various approaches to incorporate nitrogen atoms into titania have been reported, such as doping during film sputtering [131], annealing under ammonia gas [12], ion implantation [132,133], hydrazine treatment [134][135][136], urea treatment [137][138][139], treatment of sol-gel titania with nitrogen-containing organics [140], electrochemical processing [141], chemical vapor deposition [142], and plasma techniques [11,13,35,[143][144][145][146][147][148][149][150]. Most of the above doping methods require high temperature treatment and complicated or expensive equipment.…”

“…Plasma treatment is an efficient method to introduce nitrogen into the titania lattice [11,13,35,[143][144][145][146][147][148][149][150]. Among available doping approaches, plasma-assisted doping has several critical advantages, such as (i) effectively incorporating heteroatoms into the TiO 2 host by providing reactive dopant species and (ii) being conducted at relatively low temperature so that the nanostructure of TiO 2 is maintained.…”