Document Type : Final File


Water and wastewater treatment research laboratory, Department of chemistry, Faculty of science, University of Zanjan, Zanjan, Islamic Republic of Iran


Present work investigates the capability of oxidative treatment process in the presence of nano silver doped on silicate particles for decolorization of a widely used azo dye, C.I. Direct Blue 129 (DB129) in water samples. Solutions with initial concentration of 20 mgL-1 of dye, within the range of generic concentration in textile wastewaters, were treated under ambient conditions of initial pH of 6.7 and temperature of 25ºc. The operational parameters evaluation including dye and peroxydisulfate concentration, initial pH, nanoparticles dosage and reaction time was studied in an endeavor to reach the higher dye removal efficiency. Subsequently, a removal more than 90% of dye was attained by applying the optimal operational conditions as follow: 0.4 g of catalyst, 20 mgL-1 of dye, 5 mM of peroxydisulfate and initial pH of 6.7 in 35 min. Moreover, kinetic study for various parameters in several conditions for treatment process was investigated. Pseudo- first-order reaction rate constants were calculated for the systems. The morphology and crystal structure of Ag-SiO2 nanoparticles were characterized by means of Transmission Electron Microscope (TEM).


1. Ma J., Ding Z., Wei G., Zhao H and Huang T., Sources of water pollution and evolution of water quality in the Wuwei basin of Shiyang river. J. Environ. Manage. 90: 1168-1177 (2009). 
2. Deblonde T and Hartemann P., Environmental impact of medical prescriptions: assessing the risks and hazards of persistence, bioaccumulation and toxicity of pharmaceuticals. Public. Health. 127:312-317 (2013).
3. Yagub M. T., Sen T. K., Afroze S and Ang H. M., Dye and its removal from aqueous solution by adsorption: a review. Adv. Colloid. Interface. Sci. 209:172-184 (2014).
4. Bokare A. D and Choi W., Review of iron-free Fenton-like systems for activating H2O2 in advanced oxidation processes. J. Hazard. Mater. 275:121-135 (2014).
5. Eskandarian M., Mahdizadeh F., Ghalamchi L and Naghavi S., Bio-Fenton process for Acid Blue 113 textile azo dye decolorization: characteristics and neural network modeling. Desalin. Water. Treat. 52: 4990-4998 (2014).
6. Dawood S and Sen T. K., Removal of anionic dye Congo red from aqueous solution by raw pine and acid-treated pine cone powder as adsorbent: equilibrium, thermodynamic, kinetics, mechanism and process design. Water. Res. 46: 1933-1946 (2012).
7. Li H., Li Y., Xiang L., Huang Q., Qiu J., Zhang H., ... and Valange S., Heterogeneous photo-Fenton decolorization of Orange II over Al-pillared Fe-smectite: response surface approach, degradation pathway, and toxicity evaluation. J. Hazard. Mater. 287: 32-41 (2015).
8. Shih Y J., Putra W N., Huang Y H and Tsai J C., Mineralization and deflourization of 2,2,3,3-tetrafluoro-1-propanol (TFP) by UV/persulfate oxidation and sequential adsorption. Chemosphere. 89: 1262-1266 (2012).
9. Sohrabi V., Ross M. S., Martin J. W and Barker J. F., Potential for in situ chemical oxidation of acid extractable organics in oil sands process affected groundwater. Chemosphere. 93: 2698-2703 (2013).
10. Gu X., Lu S., Qiu Z., Sui Q., Miao Z., Lin, K., ... and Luo Q., Comparison of photodegradation performance of 1, 1, 1-trichloroethane in aqueous solution with the addition of H2O2 or S2O82–oxidants. Ind. Eng. Chem. Res. 51: 7196-7204 (2012).
11. Rasoulifard M H.,  Marandi R., Majidzadeh H and Bagheri I., Ultraviolet Light-Emitting Diodes and Peroxydisulfate for Degradation of Basic Red 46 from Contaminated Water. Environ. Eng. Sci. 28: 229-235 (2011).
12. Rasoulifard M. H., Ghalamchi L., Azizi M., Eskandarian M. R and Sehati. N., Application of Ultraviolet Light-Emitting Diodes to the Removal of Cefixime Trihydrate from Aqueous Solution in the Presence of Peroxydisulfate. J. Appl. Chem. Res. 9: 61-72 (2015).
13. Li Y., Li H., Zhang J., Quan G and Lan Y., Efficient Degradation of Congo Red by Sodium Persulfate Activated with Zero-Valent Zinc. Water. Air. Soil. Pollut.  225: 1-8 (2014).
14. Salari D., Daneshvar N., Niaei A., Aber S and Rasoulifard M., The photo-oxidative destruction of C.I. Basic Yellow 2 using UV/S2O82−process in an annular photoreactor. J. Environ. Sci. Health. Part A. 43: 657-663 (2008).
15. Vicente F., Santos A., Romero A and Rodriguez S., Kinetic study of diuron oxidation and mineralization by persulphate: Effects of temperature, oxidant concentration and iron dosage method. Chem. Eng. J. 170:127-135 (2011).
16. Gong Y and Lin L., Oxidative decarboxylation of levulinic acid by silver (i) /persulfate. Molecules. 16: 2714-2725 (2011).
17. Rasoulifard M. H., Doust Mohammadi S. M. M., Heidari A and Farhangnia E., Degradation of acid red 14 by silver ion-catalyzed peroxydisulfate oxidation in an aqueous solution. Turk. J. Eng. Environ. Sci. 36: 73-80 (2012).
18. Zhang N., Kong X., Zhang M and Zhu Y., Study on treatment of methyl-orange in water by derivable oxidation of peroxydisulfate. J. Adv. Oxid. Tech. 10:193-195 (2007).
19. Rasoulifard M., Fazli M and Eskandarian M. R., Kinetic study for photocatalytic degradation of direct red 23 in UV–LED/nano-TiO2/S2O82− process: dependence of degradation kinetic on operational parameters. J. Ind. Eng. Chem. 20: 3695-3702 (2014). 
20. Saien J., Ojaghloo Z., Soleymani A. R and Rasoulifard M. H., Homogeneous and heterogeneous AOPs for rapid degradation of Triton X-100 in aqueous media via UV light, nano titania hydrogen peroxide and potassium persulfate. Chem. Eng. J. 167: 172-182 (2011).
21. Yan J., Lei M., Zhu L., Anjum M. N., Zou J and Tang H., Degradation of sulfamonomethoxine with Fe3O4 magnetic nanoparticles as heterogeneous activator of persulfate. J. Hazard. Mater. 186: 1398-1404 (2011).
22. Xu X. R and Li X. Z., Degradation of azo dye Orange G in aqueous solutions by persulfate with ferrous ion. Sep. Purif. Technol. 72: 105-111 (2010).
23. Devi P., Das U and Dalai A. K., In-situ chemical oxidation: Principle and applications of peroxide and persulfate treatments in wastewater systems. Sci. The Total. Environ. 571: 643-657 (2016).