Applied Chemical Engineering

An overview to photo-catalytic degradation of dyes in waste water

Mohd Hanief Najar

Department of Chemistry, Govt. College of Engineering and Technology Safapora

Ishtiyaq Ahmed Najar

Department of Environmental science, Govt. Degree College

DOI: https://doi.org/10.24294/ace.v1i4.615

---

Abstract

Organic dyes used in textile and food industries are the important sources of environmental contaminations due to their non-bio degradability and high toxicity to aquatic creatures and carcinogenic effects on humans. This demands environmental remediation by the use of techniques which are environmentally benign. For this purpose, a general overview of dye degradation by light in the presence of materials as photo-catalysts has been given. The mechanism of action has also been described. Importantly, the materials involved in dye degradation usually involve nano-composites of either conducting polymers or metal-oxidesor graphene based systems which are insoluble in aqueous solutions, hence will be environmentally benign and can therefore be recovered after use.

---

References

[1] Pan Xiong,Lianjun Wang, Xiaoqiang Sun,Binhai, Xuand Xin Wang, Ternary Titania−Cobalt Ferrite−Polyaniline Nanocomposite: A Magnetically Recyclable Hybrid for Adsorption andPhotodegradation of Dyes under Visible Light, Ind. Eng. Chem. Res. 2013, 52, 10105−10113
[2] Chen C., Lu C., Chung Y,Photocatalytic degradation of ethyl violet in aqueous solution mediated by TiO2 suspensions,J. Photochem.Photobiol., A: Chem. 2006, 181, 120−125.
[3] Oliveira A. S., Saggioro E. M., Barbosa N. R., Mazzei A., Ferreira L. F. V., Moreira J. C., Surfacephotocatalysis: A study of the thickness of TiO2 layers on the photocatalytic decomposition of soluble indigo blue dye, Rev. Chim. (Bucharest, Rom.)2011, 62, 462−468.
[4]Sojić D.,Despotović V.,Abramović B., Todorova N.,Giannakopoulou T., Trapalis C., Photocatalytic degradation of mecoprop and clopyralid in aqueous suspensions of nanostructured N-doped TiO2, Molecules 2010, 15, 2994−3009.
[5]Vasapollo G., Mele G., Sole R. D.,Pio I., Li J., Mazzetto S. E.,Use of novel cardanol-porphyrin hybrids and their TiO2-based composites for the photodegradation of 4-nitrophenol in water, Molecules 2011, 16, 5769−5784.
[6] M. HasmathFarzana and SankaranMeenakshi, Synergistic Effect of Chitosan and Titanium Dioxide on the Removal of Toxic Dyes by the Photodegradation Technique, Ind. Eng. Chem. Res. 2014, 53, 55−63
[7] Kun Liang, Beng Kang Tay,Olga V. Kupreeva, Taisiya I. Orekhovskaya, Sergei K. Lazarouk,and Victor E. Borisenko, Fabrication of Double-Walled Titania Nanotubes and Their Photocatalytic Activity, ACS Sustainable Chem. Eng. 2014, 2, 991−995.
[8] Haimei Fan, Haiyan Li, Bingkun Liu, Yongchun Lu, TengfengXie and Dejun Wang,Photoinduced Charge Transfer Properties and Photocatalytic Activity in Bi2O3/BaTiO3 Composite Photocatalyst, ACS Appl. Mater. Interfaces 2012, 4, 4853−4857.
[9] FengyuShen, WenxiuQue, Yucheng He,Yuan Yuan, Xingtian Yin and Gangfeng Wang, Enhanced Photocatalytic Activity of ZnO Microspheres via Hybridization with CuInSe2 and CuInS2Nanocrystals, ACS Appl. Mater. Interfaces 2012, 4, 4087−4092.
[10] Mohd. Hanief Najar and Kowsar Majid, Enhanced photocatalytic activity exhibited by PTh/ [Fe(CN)3(NO)(bpy)]4H2O nanocomposite fibers viaa synergistic approach, RSC Adv. 2015, 5, 107209–107221.