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Characterization and Photocatalytic Activities of Mesoporous Silica Containing BiVO 4 or La‐BiVO 4
Author(s) -
Golmojdeh H.,
Zanjanchi M. A.
Publication year - 2013
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201300160
Subject(s) - bismuth vanadate , photocatalysis , monoclinic crystal system , mesoporous material , catalysis , tetragonal crystal system , materials science , chemical engineering , degradation (telecommunications) , doping , inorganic chemistry , chloride , precipitation , nuclear chemistry , chemistry , phase (matter) , crystal structure , crystallography , organic chemistry , metallurgy , telecommunications , physics , optoelectronics , meteorology , computer science , engineering
Abstract Pure monoclinic BiVO 4 , La‐doped BiVO 4 catalysts, and MCM‐41 samples containing BiVO 4 and La‐doped BiVO 4 were prepared via precipitation. An improved photocatalytic activity was observed in the degradation of 2,4,6‐trichlorophenol using La‐doped samples. With higher amounts of La, a partial tetragonal crystalline phase of bismuth vanadate was found. The pure and La‐doped BiVO 4 sample were loaded onto the mesoporous silica MCM‐41. Enhanced catalytic activity was achieved in comparison with those not being loaded onto MCM‐41. The lowered band gap following the introduction of La ions and also formation of higher amounts of surface complexes with pollutant molecules are the main reasons of the improved catalytic activity. A comparison of the extent of different chlorophenols toward degradation over the prepared catalysts revealed that under current experimental conditions the samples with more chloride groups suffer higher degradation.