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Investigations on the Phase Transition between CdV 2 O 6 and Cd 2 V 2 O 7 and Their Photocatalytic Performances
Author(s) -
Li Di,
Bai Xiaojuan,
Pan Chengsi,
Zhu Yongfa
Publication year - 2013
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201300020
Subject(s) - hydrothermal circulation , chemistry , vanadate , photocatalysis , methylene blue , phase (matter) , hydrothermal synthesis , nuclear chemistry , polymerization , crystallography , analytical chemistry (journal) , inorganic chemistry , catalysis , chemical engineering , organic chemistry , polymer , engineering
CdV 2 O 6 and Cd 2 V 2 O 7 were successfully synthesized by a simple hydrothermal process. The effects of the hydrothermal temperature and pH on the phase transition between CdV 2 O 6 and Cd 2 V 2 O 7 were investigated in detail. That the Cd 2 V 2 O 7 phase could transform into CdV 2 O 6 was attributed to polymerization of vanadate in an acidic environment as the V/O ratio increased as the pH decreased. V 2 O 7 4– was stable in a neutral or alkaline environment at an identical hydrothermal temperature, therefore, the Cd 2 V 2 O 7 phase was obtained after hydrothermal treatment for 24 h. Because the degree of hydrolysis of NH 4 Cl increased with increasing temperature in the solution, the increased temperature accelerated the speed of the pH decrease. Therefore, the hydrothermal temperature played an important part in the phase transition between CdV 2 O 6 and Cd 2 V 2 O 7 . CdV 2 O 6 and Cd 2 V 2 O 7 showed high photocatalytic activity for the degradation of methylene blue under visible‐light irradiation.