Removal of Malachite Green from Waste Waters by Bentonite Based Photocatalyst Technology

Abstract

MgFe₂O₄-B/Ag₃VO₄ visible light active photocatalyst was successfully synthesized for the photocatalytic decolorization of organic pollutants. Malachite green (MG) was selected as a model dye representing those pollutant chemicals. The catalyst was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS). Malachite green (MG) decolorization was carried out by visible light irradiation of a 105 W tungsten light source. Decolorization yield and kinetic studies were traced by the help of a UV-Vis spectrophotometer. Kinetic model of decolorization was derived from Langmuir–Hinshelwood (L–H) model and found coherent to first order kinetics. Catalysis reaction showed high dependency on pH especially out of 5-7 range which gave high decolorization. Photocatalytic activity also depended on concentration with dual character in which high concentration hindered the light coming to catalyst surface but on the other hand it supported the activity by boosting the dark adsorption resulting in a decolorization time changing from 40 to 100 min. After the reaction was completed, powders of catalyst were effortlessly removed from the medium by a magnet bar. It was shown that MgFe₂O₄-B/Ag₃VO₄ photocatalyst has a potential to be simple and efficient alternative material for the removal pollution resources from wastewaters.

Keywords

• Malachite green,photocatalyst,visible active catalyst,decolorization

References

1. 1. McManamon C, O’Connell J, Delaney P, Rasappa S, Holmes JD, Morris MA. A facile route to synthesis of S-doped TiO2 nanoparticles for photocatalytic activity. J Mol Catal A-Chem. 2015;406:51–7.
2. 2. Malathy P, Vignesh K, Rajarajan M, Suganthi A. Enhanced photocatalytic performance of transition metal doped Bi2O3 nanoparticles under visible light irradiation. Ceram Int. 2014;40(1, Part A):101–7.
3. 3. Srivastava S, Sinha R, Roy D. Toxicological effects of malachite green. Aquat Toxicol. 2004;66(3):319–29.
4. 4. Pare B, Sarwan B, Jonnalagadda S B. Photocatalytic mineralization study of malachite green on the surface of Mn-doped BiOCl activated by visible light under ambient condition. Appl Surf Sci. 2011;258(1):247-253.
5. 5. Liu Y, Ohko Y, Zhang R, Yang Y,Zhang Z. Degradation of malachite green on Pd/WO3 photocatalysts under simulated solar light. J Hazard Mater. 2010;184(1-3):386-391.
6. 6. Saikia L, Bhuyan D, Saikia M, Malakar B, Dutta DK,Sengupta P. Photocatalytic performance of ZnO nanomaterials for self sensitized degradation of malachite green dye under solar light. Appl Catal A:Gen. 2015;490:42-49.
7. 7. Sturini M, Speltini A, Maraschi F, Pretali L, Profumo A, Fasani E, et al. Photodegradation of fluoroquinolones in surface water and antimicrobial activity of the photoproducts. Water Res. 2012;46(17):5575–82.
8. 8. Lin G, Zheng J, Xu R. Template-Free Synthesis of Uniform CdS Hollow Nanospheres and Their Photocatalytic Activities. J Phys Chem C. 2008;112(19):7363–70.

9. 9. Song S, Cheng B, Wu N, Meng A, Cao S, Yu J. Structure effect of graphene on the photocatalytic performance of plasmonic Ag/Ag2CO3-rGO for photocatalytic elimination of pollutants. Appl Catal B-Environ. 2016;181:71–8.
10. 10. Jin Z, Murakami N, Tsubota T, Ohno T. Complete oxidation of acetaldehyde over a composite photocatalyst of graphitic carbon nitride and tungsten(VI) oxide under visible-light irradiation. Appl Catal B-Environ. 2014;150–151:479–85.
11. 11. Liu Y, Yao W, Liu D, Zong R, Zhang M, Ma X, et al. Enhancement of visible light mineralization ability and photocatalytic activity of BiPO4/BiOI. Appl Catal B-Environ. 2015;163:547–53.
12. 12. Abbasi A, Ghanbari D, Salavati-Niasari M, Hamadanian M. Photo-degradation of methylene blue: photocatalyst and magnetic investigation of Fe2O3–TiO2 nanoparticles and nanocomposites. J Mater Sci: Mater Electron. 2016;27(5):4800–9.
13. 13. Tao X, Hong Q, Xu T, Liao F. Highly efficient photocatalytic performance of graphene–Ag3VO4 composites. J Mater Sci: Mater Electron. 2014;25(8):3480–5.
14. 14. Lee KM, Lai CW, Ngai KS, Juan JC. Recent developments of zinc oxide based photocatalyst in water treatment technology: A review. Water Res. 2016;88:428–48.
15. 15. Padervand M. Visible-light photoactive Ag–AgBr/α-Ag3VO4 nanostructures prepared in a water-soluble ionic liquid for degradation of wastewater. Appl Nanosci. 2016;6(8):1119–26.
16. 16. Wang S, Guan Y, Wang L, Zhao W, He H, Xiao J, Sun C. Fabrication of a novel bifunctional material of BiOI/Ag3VO4 with high adsorption–photocatalysis for efficient treatment of dye wastewater. Appl Catal B-Environ. 2015;168:448-457.
17. 17. Bhunia SK, Jana NR. Reduced Graphene Oxide-Silver Nanoparticle Composite as Visible Light Photocatalyst for Degradation of Colorless Endocrine Disruptors. ACS Appl Mater Interfaces. 2014;6(22):20085–92.
18. 18. Zhang L, He Y, Ye P, Qin W, Wu Y, Wu T. Enhanced photodegradation activity of Rhodamine B by Co3O4/Ag3VO4 under visible light irriadiation. Materials Science and Engineering: B. 2013;178(1):45–52.
19. 19. Sun G, Xu H, Li H, Shu H, Liu C, Zhang Q. Fabrication and characterization of visible-light-induced photocatalyst Gd2O3/Ag3VO4. Reac Kinet Mech Cat. 2010;99(2):471–84.
20. 20. Ren J, Wu Y, Dai Y, Sha D, Pan J, Chen M, et al. Preparation and characterization of graphitic C3N4/Ag3VO4 with excellent photocatalytic performance under visible light irradiation. J Mater Sci: Mater Electron. 2017;28(1):641–51.
21. 21. Anderson C, Bard AJ. Improved Photocatalytic Activity and Characterization of Mixed TiO2/SiO2 and TiO2/Al2O3 Materials. J Phys Chem B. 1997;101(14):2611–6.
22. 22. Arshadnia I, Movahedi M, Rasouli N. MgFe2O4 and MgFe2O4/ZnFe2O4 coated with polyaniline as a magnetically separable photocatalyst for removal of a two dye mixture in aqueous solution. Res Chem Intermed. 2017;43(8):4459–74.
23. 23. Nabiyouni G, Ghanbari D, Ghasemi J, Yousofnejad A. Microwave-assisted synthesis of MgFe2O4-ZnO nanocomposite and its photo-catalyst investigation in methyl orange degradation. Journal of Nanostructures. 2015;5(3):289–295.
24. 24. Hu X, Hu C. Preparation and visible-light photocatalytic activity of Ag 3VO 4 powders. Journal of Solid State Chemistry France. 2007;180:725–32.
25. 25. Sheykhan M, Mohammadnejad H, Akbari J, Heydari A. Superparamagnetic magnesium ferrite nanoparticles: a magnetically reusable and clean heterogeneous catalyst. Tetrahedron Lett. 2012;53(24):2959–64.
26. 26. Zhang L, He Y, Ye P, Qin W, Wu Y, Wu T. Enhanced photodegradation activity of Rhodamine B by Co3O4/Ag3VO4 under visible light irriadiation. Mater Sci Eng B. 2013;178(1):45–52.
27. 27. Phaltane SA, Vanalakar SA, Bhat TS, Patil PS, Sartale SD, Kadam LD. Photocatalytic degradation of methylene blue by hydrothermally synthesized CZTS nanoparticles. J Mater Sci: Mater Electron. 2017;28(11):8186–91.
28. 28. Mondal S, Reyes MEDA, Pal U. Plasmon induced enhanced photocatalytic activity of gold loaded hydroxyapatite nanoparticles for methylene blue degradation under visible light. RSC Adv. 2017;7(14):8633–45.
29. 29. Sivakumar V, Suresh R, Giribabu K, Narayanan V. AgVO3 nanorods: Synthesis, characterization and visible light photocatalytic activity. Solid State Sci. 2015;39:34–9
30. 30. Li Y-CM, Tsai R-H, Huang C-M. Preparation of nano-sized silver vanadates: characterization and photocatalytic activity. Proceedings of the Institution of Mechanical Engineers, Part N: Journal of Nanoengineering and Nanosystems. 2012;226(1):35–8.