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Alumina coating with TiO 2 and its effect on catalytic photodegradation of phenol and p ‐cresol
Author(s) -
Gómez Claudia M,
Angel Gloria Del,
RamosRamírez Esthela,
RangelVázquez Israel,
González Federico,
Arrieta Alma,
VázquezZavala Armando,
BonillaSánchez Adriana,
Sánchez Cantú M
Publication year - 2016
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.5025
Subject(s) - anatase , photodegradation , boehmite , photocatalysis , alkoxide , catalysis , titanium , chemical engineering , materials science , phenol , specific surface area , inorganic chemistry , chemistry , organic chemistry , composite material , metallurgy , aluminium , engineering
Abstract BACKGROUND This study is focused on the peptization of Boehmite and titanium alkoxide (modified sol–gel method) to obtain Al 2 O 3 –TiO 2 mixed oxides taking advantage of the physicochemical properties of TiO 2 and Al 2 O 3 . TiO 2 is an important semiconductor and the most active photocatalyst. Al 2 O 3 is an insulator with high surface area and thermal, chemical and mechanical resistance. It is possible to produce high surface area materials, where TiO 2 is dispersed on the alumina surface for photodegradation of pollutants. RESULTS γ‐Al 2 O 3 –TiO 2 (5, 10 and 15 wt% TiO 2 ) mixed oxides presented stabilization of the anatase phase. Rietveld studies showed incorporation of the Al 3+ into the TiO 2 anatase and Ti 4+ into the Al 2 O 3 . They exhibit higher specific surface area than pure TiO 2 . The TiO 2 ‐coated alumina surface with small TiO 2 particles produced a large number of active sites on the surface. The sample with 15 wt% of TiO 2 presented the highest photodegradation of p ‐cresol and phenol. CONCLUSION The addition of TiO 2 to the alumina improved the photoactivity of pure TiO 2 producing materials with higher surface area covered with TiO 2 . Alumina delayed the recombination of photogenerated electron–hole pairs favoring the formation of highly reactive •OH radicals. The photodegradation of p ‐cresol and phenols increased with TiO 2 loading increase. © 2016 Society of Chemical Industry