Investigation of photocatalytic removal of methyl orange by titanium dioxide nanoparticles modified with silver and cobalt

Subject Areas : Water and Environment

Nasim  Ziaeifar ¹ (Assistant Prof. of applied Chemistry, Department of Chemistry, Maragheh branch, Islamic Azad University, Maragheh, Iran. *(CorrespondingAuthor))
saber  Khodaei ² (Assistant Professor, of Statistics Department, Maragheh branch, Islamic Azad University, Maragheh, Iran.)

Received: 2021-11-23 Accepted : 2022-12-20 Published : 2022-12-22

Keywords: modified titanium dioxide nanoparticles, methyl orange, silver and cobalt, Removal of contaminants,

Abstract :

Background and Objective: In order to investigate the photocatalytic activity of modified titanium dioxide nanoparticles in order to remove methyl orange contaminants, parameters such as the amount of contaminant concentration, the amount of photocatalytic, the pH of the solution and the calcination temperature were investigated. Material and Methodology: In this study, Ag-Co / TiO2 nanoparticles were synthesized by sol-gel method and characterized by TEM, SEM, XRD and EDX techniques. The results of  XRD diffraction studies showed that the simultaneous deposition of silver and cobalt had no effect on the crystalline pattern of titanium dioxide. The formation of Ag-Co / TiO2 nanoparticles and their approximate size were confirmed using the XRD spectrum and is about 270 nm. TEM images with a particle size of about 300 nm also confirm the XRD results. The morphology and purity of these synthesized nanoparticles were evaluated through SEM and EDX images. The results of EDX analysis showed that Ag-Co / TiO2 nanoparticles prepared by sol-gel method did not have a peak of impurity in the sample. The photocatalytic activity of Ag-Co / TiO2 nanoparticles under visible light irradiation was evaluated in the removal of methyl orange contaminants.     Findings: Co doped TiO2 nanoparticles by Ag and Co were shown to have highest activity as compared with the Ag/TiO2 , Co /TiO2 and pure TiO2 nanoparticles.  The highest percentage of methyl orange removal by Ag-Co / TiO2 is 99.5% in 75 minutes. Discussion and Conclusion: The optimum contents of silver and Cobalt for the preparation of co-doped Ag,Co/TiO2 nanoparticles were 0.9 and 0.3 at mol%, respectively

References:

1. E.H., 2004, polymer chemistry and Hydrogel systems, Journal of Physics: Conference Series, Vol. 3, pp. 22-28.


2. DSL., Monteneiro RTR., 2001. Decolorization of textile indigo dye by ligninolytic fungi. J biotechnol, vol. 89, pp.141-145.


3. J.M., 1999. Heterogeneous photocatalysis: Fundamentals and applications to the removal of various types of aqueous pollutants. Catal. Today, vol. 53, pp. 115-129.


4. Klavarioti., Mantzavinos. D., Kassinos. D., 2009. Removal of residual pharmaceuticals from aqueous systems by advanced oxidation processes. Environ. Int, vol. 35, pp. 402-417.


5. Ahmed. P ., Rasul. S., Martens.M.G., Brown. W.N., Hashib. R., 2010. Heterogeneous photocatalytic degradation of phenols in wastewater. a review on current status and developments, Desalination, vol.  261 (1 - 2), pp. 3-8.


6. A., Rao. T.N., Tryk. D.A., 2000. Titanium dioxide photocatalysis. J. Photochem. Photobiol, vol. 1, pp. 1-21.


7. L.G., Kottam. N., Murthy. B.N., Kummar.S.G., 2010. Enhanced photocatalytic activity of transition metal ions Mn²⁺, Ni²⁺ and Zn²⁺ doped polycrystalline titania for the degradation of Aniline Blue under UV/Solar light. J. Mol. Catal. A-Chem, vol. 328, pp. 44-52.


8. U.G., Hameed. B.H., 2010. The advancements in sol–gel method of doped-TiO₂ photocatalysts. Appl. Catal, vol. 375, pp. 1–11.


9. E.D., Borse. P.H., Jang. J.S., 2008. Hydrothermal synthesis of Cr and Fe co-doped TiO₂ nanoparticle photocatalyst J. Ceram. Process Res. Vol. 9, pp. 250–253.


10. J., Zhang. Z., Yang. L., 2011. The Degradation of Reactive Black Wastewater by Fe/Cu Co-doped TiO₂. J. International Journal of Chemistry , vol. 3, pp. 87-92


11. Wang, W., Zhang. J., Chen. F., Anpo. D., 2008. Preparation and photocatalytiy roperties of Fe³⁺-doped Ag@TiO₂ core–shell nanoparticle .J , Colloid and Interface Science, vol. 323, pp. 182-186.


12. P., Pakshirajan. K., Saha. P., 2009. Degradation of phenol by TiO₂-based heterogeneous photocatalysts in presence of sunlight. Journal of Hydroenvironment Research, vol. 3, pp. 45–50.


13. H. Y., Chen. D .H., 2009.Fabrication and photocatalytic activities in visible and UV light regions of Ag@ TiO₂ and NiAg@ TiO_2. nanoparticles Nanotechnology, vol. 20, No. 10, 105704.


14. N., et al ., 2020. Evaluation of optimization removal of methyl orange from aqueous solutions with Ag, Co/TiO2 nano-particles by experimental design. J. Env. Sci. Tech, Vol. 22, No.5, pp. 303-311. (In Persian)


15. M.A., Eskandarloo. H., 2013. Silver and copper co- impregnated on to TiO₂-P25 nanoparticles and its photocatalytic activity. Chemical Engineering Journal, vol. 228, pp. 1207–1213.


16. N., Oladegaragozy.  A., Jafarzadeh.  N., 2006.  Decolorization of basic dye solutions by electrocoagulation: An investigation of the effect of operational parameters. J. Hazard. Mater, Vol. 129, pp. 116-122.


17. VK., et al., 2013. Remidiation and recovery of methyl orange from aqueous solution onto acrylic and grafted ficus caricnd fiber. Isotherms kinetics and thermodynamics. Journal of Molecular Liquids. Vol. 177, pp. 325-34.


18. M.B., Dhabbe R.S., Kadam. A.N., Garadkar. K.M., 2014. Enhanced photocatalytic activity of Ag doped TiO₂ nanoparticles synthesized by a microwave assisted method. J. Ceramics International, vol. 4, pp. 5489-5496.