Heterogeneous photocatalysis of real textile wastewater: Evaluation of reaction kinetics and characterization

• Published in: Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering Vol. 47; no. 13; pp. 2109 - 2119
• Main Authors: Sahoo, Chittaranjan, Gupta, Ashok K, Pillai, Indu M. Sasidharan
• Format: Journal Article
• Language: English
• Published: Philadelphia, PA Taylor & Francis Group 01-01-2012; Taylor & Francis; Taylor & Francis Ltd
• Subjects: Applied sciences; chemical oxygen demand; COD; cotton; decolorization; decolourization; dyeing; Dyes; Exact sciences and technology; Fourier transform infrared spectroscopy; General purification processes; Kinetics; mineralization; Photocatalysis; Photochemistry - methods; Pollution; Reaction kinetics; Regression analysis; silver; Textile Industry; Textile wastewater; Ultraviolet radiation; Ultraviolet Rays; Waste Water - chemistry; wastewater; Wastewaters; Water treatment; Water treatment and pollution; Discoloration; decolourization; Photocatalysis; Regression analysis; Waste water; Kinetic model; Textile wastewater; Ultraviolet radiation; Batchwise; Chemical oxygen demand; Industrial waste water; Mineralization; First order; COD; Kinetics; Titanium oxide; Reactor; Catalyst; Textile industry
• ISSN: 1532-4117; 1093-4529; 1532-4117
• DOI: 10.1080/10934529.2012.695996

Real textile wastewater collected from the cotton dyeing bath of a fabric dyeing and finishing plant was subjected to heterogeneous photocatalysis using Ag⁺ doped TiO₂ under UV irradiation in a batch reactor. The photocatalysts were characterized by FESEM, XRD, EDS, FTIR, DRS and BET analyses. The kinetics of the reaction was also evaluated. Colour removal was more than 88%, 94% and 99%, respectively for undiluted, 2 times diluted and 5 times diluted wastewater with Ag⁺ doped TiO₂ (2.5 g/L) after UV irradiation for 360 minutes. The COD removal for undiluted, 2 times diluted and 5 times diluted wastewater was 47%, 70% and 92%, respectively under similar conditions. The reaction followed Langmuir-Hinshelwood pseudo first order kinetic model and the data fitted well to polynomial regression analysis.