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Enhanced Photocatalytic Activity of P25 TiO 2 after Modification with Phosphate‐Treated Porous SiO 2
Author(s) -
Luan Yunbo,
Feng Yujie,
Cui Haiqin,
Cao Yue,
Jing Liqiang
Publication year - 2014
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201402063
Subject(s) - photocatalysis , surface photovoltage , adsorption , phosphoric acid , acetaldehyde , anatase , phosphate , chemical engineering , materials science , radical , surface modification , desorption , degradation (telecommunications) , inorganic chemistry , photochemistry , chemistry , catalysis , organic chemistry , spectroscopy , telecommunications , physics , quantum mechanics , computer science , ethanol , engineering
In general, an increase in O 2 adsorption is highly desirable for efficient photocatalysis. Herein, commercial P25 TiO 2 is modified with an F127‐containing SiO 2 sol, and post‐treated with phosphoric acid. It is confirmed, on the basis of O 2 temperature‐programmed desorption measurements, that the O 2 adsorption of commercial P25 TiO 2 is greatly promoted through its modification with porous SiO 2 , especially in the phosphate‐treated case. The promotion of O 2 adsorption is attributed to the introduction of SiOH and POH as surface ends, and to the slightly increased surface area. Interestingly, it is concluded that the promotion of O 2 adsorption is favorable for the separation of photogenerated charge carriers, as seen from the steady‐state surface photovoltage spectra, transient‐state surface photovoltage responses, and measurements of the hydroxyl radicals produced. This is responsible for the clear enhancement in the photocatalytic activity of modified TiO 2 for the degradation of gas‐phase acetaldehyde and liquid‐phase phenol as colorless pollutants. This work provides a feasible route for improving the photocatalytic activity of TiO 2 .