Mohammad Taghi Samadi
1, Mir Saeid Sayed Dorraji
2, Zolykha Atashi
1, d Ali Reza Rahmani
1*1 Environmental Health Engineering Department, Research Center for Health Sciences, Hamadan University of Medical Sciences, Faculty of Health, Hamadan, IR Iran
2 Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, IR Iran
Abstract
In this study, ZnO Nano catalyst has been synthesized and examined as photo catalyst for UV-induced removal of Sodium Dodecyl Sulfate
(SDS) from aquatic solutions. This anionic surfactant was selected based upon its toxicity, wide use in industrial laundry and as a primary
pollutant in municipal waste water systems.This study aimed to investigate removal of surfactant, SDS, in a batch photo catalytic reactor
under various operating conditions including ZnO suspension concentration, initial surfactant concentration and initial pH of solution
to find out the desired condition for removal of surfactant. ZnO Nano crystals were synthesized using the precipitation method and
ZnSO4.7H2O was used as the starting material and NaOH as precipitant. The removal of SDS reactions by UV/ZnO process was performed into
a batch photo reactor. In addition, various operating conditions including ZnO suspension concentration, initial surfactant concentration
and initial pH of solution were investigated. In total, 98% of surfactant was removed at 40 minute and removal efficiency of SDS increased
with increasing pH up to nine and after that with increase in pH, efficiency decreased. Possible roles of inorganic oxidant on the reaction
were discussed. The removal of SDS follows pseudo-first order kinetics. Based on the results of this study, ZnO-UV photo catalytic process
can be used as an efficient method for further study in detergents removal.