Using ZnO based on Bentonite as a nano photocatalyst for degradation of Acid Red 114 in synthetic wastewater

Document Type : Original Research Paper


1 Department of Occupational Health& Safety Engineering, Sabzavar University of Medical ScienceSabzavar, Iran

2 Department of Occupational Health& Safety Engineering, Qhom University of Medical Science Qhom, Iran.

3 Department of chemistry, Faculty of Science, Payamenoor University, Tehran, Iran.



In this project, the removal of Acid Red 114(AR 114) that is a mono Azoo dye with
global usage in an aqueous environment was explored by nano photocatalytic
process. The ZnO was supported on Bentonite and used at suspension state in
a batch photoreactor. The catalyst was synthesized by co precipitation methods
and characterized by Scanning Electronic Microscopy (SEM), X-Ray Diffraction
(XRD), and Fourier Transform Infrared (FT-IR) spectra. The effect of operational
variables including pH, initial concentration of Acid red 114, amounts of catalysts
and temperature were investigated on the removal efficiency of AR114. The
optimum conditions were achieved at 1g/l of catalyst, 30 mg/l of AR 114, pH of
9 and temperature at 35oC. The removal of AR 114 in UV, UV/ZnO, and UV/ZnO/
Bentonite process were 26.5, 55 and 92.5% after 2 h of treatment, respectively.
The photo catalytic degradation mechanism was described and the efficiency of
the process increased considerably by modification of photocatalyst.