Submitted: 10 Nov 2014
Revised: 10 Dec 2014
Accepted: 11 Dec 2014
First published online: 01 Oct 2017
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Avicenna J Environ Health Eng. 2014;1(1):17-23.
doi: 10.5812/ajehe.166
  Abstract View: 84
  PDF Download: 90

Research Article

Photo Catalytic Removal of Sodium Dodecyl Sulfate From Aquatic Solutions With Prepared ZnO Nanocrystals and UV Irradiation

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

Article

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.
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