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. Also, 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 the
powder X-ray diffraction (PXRD) technique. In order to investigate the effect of
concentration of the Basic solutions on the obtained materials,morphology, the
synthesized materials’ morphologies were studied by field emission scanning
electron microscopy (FESEM) technique. As shown by the FESEM images, the
CuWO4 material morphology was spherical particles. Besides, the photocatalytic
performance of the as-synthesized nanocomposites was studied for the
degradation of Reactive Blue 19 (RB19) under direct visible light irradiation. For
this purpose, several reaction parameters that affect the degradation yield, such
as catalyst amount, pH value, and absence/presence of light, were investigated.
The results indicate the higher photocatalytic yield at the presence of light
irradiation when the solution’s pH value was in the acidic range and the weight
percent of silver phosphate in the composite mixture and the catalyst amount
was more. The information revealed that a 0.05 g nanocomposite containing
0.24 mmole of Ag3PO4, with an initial pH of 3 and 100 mL of RB 19 with 30 mg/L
concentration, approximately after 30 min, could remove completely under
visible light illumination.