Fabrication and photocatalytic degradation of reactive blue 19 by CuWO4, Ag3PO4, and CuWO4-Ag3PO4 composites under visible light irradiation

Document Type : Original Research Paper


Department of Chemical Engineering, Shahrood Branch, Islamic Azad University, Shahrood, Iran



CuWO4 nano-powder was synthesized via a hydrothermal reaction using CuCl2.2H2O
and Na2WO4.2H2O in the stoichiometric 1:1 Cu:W molar ratio and sodium
citrate as raw materials. In addition, Ag3PO4 was synthesized by a precipitation
method using Na2HPO4 and AgNO3. Finally, CuWO4-Ag3PO4 nanocomposite was
synthesized in a precipitation route using the as-synthesized CuWO4 and Ag3PO4
as raw materials. The synthesized materials were characterized by powder X-ray
diffraction (PXRD) technique. To investigate the effect of concentration of the basic
solutions on the morphology of the obtained materials, the morphologies of the
synthesized materials were studied by field emission scanning electron microscopy
(FESEM) technique. As shown by the FESEM images, the morphology of CuWO4
the material was spherical particles. Besides, the photocatalytic performance of the
as-synthesized nanocomposites was studied for the degradation of Reactive
Blue 19 (RB19) under directly visible light irradiation. For this purpose, several
reaction parameters affect the degradation yield, such as catalyst amount, pH
value and absence/presence of light were investigated. The data showed that
the photocatalytic yield at the presence of light irradiation was more when the
The pH value of the solution was in the acidic range, the weight percent of silver
phosphate in the composite mixture was more, and the catalyst amount was
more. The findings revealed that a 0.05 g nanocomposite containing 0.24 mmole
of Ag3PO4, with an initial pH of 3 and RB 19 volume and concentration of 100 mL
and 30 mg/L, respectively, could achieve approximately complete removal after
30 min under visible light illumination.