Heterogeneos Photocatalytic Decolorization of Brown NG by TiO2 –UV Process

Document Type: Research Article

Authors

Faculty of Chemistry, University of Tabriz, Tabriz, I.R. IRAN

Abstract

The photocatalytic decolorization of aqueous solutions Brown NG, a commercial textile dye, was studied using titana Degussa P-25 as a catalyst for the first time. The experiments were carried out in a batch reactor with the use of artificial light sources (UV-C). The effects of various process variables on decolorization performance of the process have been investigated. The photodegradation of Brown NG was enhanced by the addition of proper amounts of hydrogen peroxide, but it was inhibited by ethanol. Inhibiting effect of ethanol showed that hydroxyl radicals play a significant role in the photodegradation of the dye. In addition, the decolorization efficiency increased with decrease in pH, which implies that the pH is a very important parameter in dye adsorption. The efficiency is inversely related to the dye concentration. Results of TOC analysis show that the organic compounds were degraded, too.

Keywords

Main Subjects


[1] Yuan S., Sheng Q., Zhang J., Chen F., Anpo M., Zhang Q., Synthesis of La3+ Doped Mesoporous Titania with Highly Crystallized Walls, Microporous and Mesoporous Materials 79, p. 93 (2005).

[2] Konstantinou I.K., Albanis T.A., TiO2-Assisted Photocatalytic Degradation of Azo Dyes in Aqueous olution: Kinetic and Mechanistic Investigations: A Review, Appl. Catal. B. Environ. 49, p. 1 (2004).

[3] Aguedach A., Brosillon S., Morvan J., Lhadi E.K., Influence of Ionic Strength in the Adsorption and During Photocatalysis of Reactive Black 5 Azo Dye on TiO2 Coated on Non Woven Paper with SiO2 as a Binder, Journal of Hazardous Materials, 150, p. 250 (2008).

[4] Aguedach A., Brosillon S., Morvan J., Lhadi E.K., Photocatalytic Degradation of Azo-Dyes Reactive Black 5 and Reactive Yellow 145 in Water Over a Newly Deposited Titanium Dioxide, Applied Catalysis B: Environmental, 57, p. 55 (2005).

[5] Grzechulska J., Morawski A.W., Photocatalytic Decomposition of Azo-Dye Acid Black 1 in Water Over Modified Titanium Dioxide, Applied Catalysis B: Environmental, 36, p. 45 (2002).

[6] Golka K., Kopps S., Myslak Z.W., Carcinogenicity of Azo Colorants: Influence of Solubility and Bioavailability, Toxicol. Lett., 151, p. 203 (2004).

[7] Swaminathan K., Sandhya S., Sophia A.C., Pachhade K., Subrahmanyam Y.V., Decolorization and Degradation of H-Acid and Other Dyes Using Ferrous-Hydrogen Peroxide System, Chemosphere, 50, p. 619 (2003).

[8] Esplugas S., Gimenez J., Contreras S., Pascual E., Rodriguez M., Comparison of Different Advanced Oxidation Processes for Phenol Degradation, Water Research, 36, p. 1034 (2002).

[9] Bhatkhande D.S., Kamble S.P., Sawant S.B., Pangarkar V.G., Photocatalytic and Photochemical Degradation of Nitrobenzene Using Artificial Ultraviolet Light, Chemical Engineering Journal, 102, p. 283 (2004).

[10] Akyol  A.,  Yatmaz  H.C.,  Bayramoglu  M., Photocatalytic Decolorization of Remazol Red RR in Aqueous ZnO Suspensions, Applied Catalysis B: Environmental, 54, p. 19 (2004).

[11] Moon J., Yun C.Y., Chung K.W., Kang M., Yi J., Photocatalytic Activation of TiO2 Under Visible Light Using Acid Red 44, Catal. Today, 87, p. 77 (2003).

[12] Muruganandham M., Swaminathan M., Photocatalytic Decolourisation and Degradation of Reactive Orange4 by TiO2-UV Process, Dyes and Pigments, 68, p 133 (2006).

[13] Soutsas K., Karayannis V., PouliosI., RigaA., Ntampegliotis K., Spiliotis X., Papapolymerou G., Decolorization and Degradation of Reactive Azo Dyes Via Heterogeneous Photocatalytic Processes, Desalination, 250, p. 345 (2010).

[14] Kusvuran E., Gulnaz O., Irmak S., Atanur O.M., Yavuz H.I., Ebratur O., Comparison of Several Advanced Oxidation Processes for the Decolorization of Reactive Red 120 Azo Dye in Aqueous Solution, Journal of Hazardous Materials B 109, p. 85 (2004).

[15] Higarashi  M.M.,  Jardim  W.F.,  Remediation  of Pesticide Contaminated Solid Using TiO2 Mediated by Solar Light, Catalysis Today, 76, 201 (2002).

[16] Tanaka K.,  Reddy K.S.N.,  Photodegradation  of Phenoxyacetic Acid and Carbamate Pesticides on TiO2, Applied Catalysis B: Environmental, 39, p. 305 (2002).

[17] Irmak S., Kusvuran E., Erbatur O., Degradation of 4-Chloro-2-Methylphenol in Aqueous Solution by UV Irradiation in the Presence of Titanium Dioxide, Applied Catalysis B: Environmental, 54, p. 85 (2004).

[18] Khatamian M., Hashemian S., Sabaee S., Preparation and Photo-Catalytic Activity of Nano-TiO2-ZSM-5 Composite, Mater.. Sci. in Semicond. Process, Available Online 9 December (2010).

[19] Shankar   M.V.,   Cheralathan   K.K.,   Banumathi Arabindoo, Palanichamy M., Murugesan V., Murugesan, Enhanced Photocatalytic Activity for the Destruction of Monocrotophos Pesticide by TiO2 / Hb, Journal of Molecular Catalysis A: Chemical, 223, p. 195 (2004).

[20] Zhu C.,  Wang L.,  Kong L.,  Yang X.,  Wang L., Zheng S., Chen F., Zhi F.M., Zong H., Photocatalytic Degradation of Azo Dyes by Supported TiO2 + UV in Aqueous Solution, Chemosphere, 41, p. 303 (2000).

[21] Behnajady  M.A.,  Modirshahla  N.,  Shokri  M., Photodestruction of Acid Orange7 (AO7) in Aqueous Solutions by UV / H2O2: Influence of Operational Parameters, Chemosphere, 55, p. 129 (2004).

[22] Daneshvar N., Salari D., Khataee A.R., Photocatalytic Degradation of Azo Dye Acid Red 14 in Water on ZnO as an Alternative Catalyst to TiO2, J. Photochem. Photobiol. A: Chemistry, 162, p. 317 (2004).

[23] Daneshvar N., Salari D., khataee A.R., Photocatalytic Degradation of Azo Dye Acid Red 14 in Water: Investigation of the Effect of Operational Parameters, J. Photochem. Photobiol. A: Chemistry, 157, p. 111 (2003).