What is it about?
CdV2O6 and Cd2V2O7 were successfully synthesized by a simple hydrothermal process. The effects of the hydrothermal temperature and pH on the phase transition between CdV2O6 and Cd2V2O7 were investigated in detail. That the Cd2V2O7 phase could transform into CdV2O6 was attributed to polymerization of vanadate in an acidic environment as the V/O ratio increased as the pH decreased. V2O74– was stable in a neutral or alkaline environment at an identical hydrothermal temperature, therefore, the Cd2V2O7 phasewas obtained after hydrothermal treatment for 24 h. Because the degree of hydrolysis of NH4Cl 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 CdV2O6 and Cd2V2O7. CdV2O6 and Cd2V2O7 showed high photocatalytic activity for the degradation of methylene blue under visible-light irradiation.
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Why is it important?
No work has been reported on CdV2O6 and Cd2V2O7 as photocatalysts. Therefore, there is a need to investigate the phase-transition mechanism of CdV2O6 and Cd2V2O7 and their photocatalytic activity.
Perspectives
In this paper, CdV2O6 and Cd2V2O7 were controllably synthesized by a simple hydrothermal method. The influence of the reaction parameters (pH and hydrothermal temperature) on the phase transition between CdV2O6 and Cd2V2O7 and the relationship between the phases and photocatalytic activities were investigated. The formation of CdV2O6 and Cd2V2O7 depended on the pH under identical hydrothermal temperatures. The hydrolysis of NH4Cl played an important part in the formation of CdV2O6 and Cd2V2O7 under different hydrothermal temperatures. CdV2O6 and Cd2V2O7 showed highly efficient photocatalytic activities for the photocatalytic decomposition of methylene blue (MB).
Dr Di Li
Read the Original
This page is a summary of: Investigations on the Phase Transition between CdV2O6and Cd2V2O7and Their Photocatalytic Performances, European Journal of Inorganic Chemistry, April 2013, Wiley,
DOI: 10.1002/ejic.201300020.
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