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Journal of Chemistry
Volume 2015, Article ID 382376, 6 pages
http://dx.doi.org/10.1155/2015/382376
Research Article

4-Nitroaniline Degradation by TiO2 Catalyst Doping with Manganese

1Department of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, China
2Jiangsu Key Laboratory of Industrial Water-Conservation and Emission Reduction, Nanjing Technology University, Nanjing 211816, China

Received 25 September 2014; Revised 13 January 2015; Accepted 15 January 2015

Academic Editor: Lavinia Balan

Copyright © 2015 Kai Zheng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Stainless steel anode covered with layer film of TiO2 doped with manganese was utilized to decompose 4-nitroaniline in rectangular borosilicate glass reactor, while stainless steel mesh was chosen as cathode; the anode and cathode were connected to the direct-current power; meantime two 60 W (λmax = 365 nm) UV lamps were used as light source. The microstructures on TiO2 before and after being doped with manganese were analyzed by energy disperse X-ray (EDX) and X-ray diffraction (XRD). The performance of degradation of 4-nitroaniline was evaluated by analyzing cracking ratio of 4-nitroaniline ring, the chemical oxygen demand (COD), and total organic carbon (TOC) in remaining solution. Monitored parameters during all the photocatalytic reaction including dissolved oxygen, direct voltage, and radiation dosage of ultraviolet rays were investigated. When dissolved oxygen concentration, direct voltage, and radiation dosage of ultraviolet rays were, respectively, equivalent to 9 mg/L, 24 V, and 1200 μW/cm2, the degradation ratio of 4-nitroaniline reached maximum. The experimental results indicated that cracking ratio of 4-nitroaniline ring and the removal ratio of COD and TOC were, respectively, more than 99%, 85%, and 80% when reaction was run for 10 hours. The values of COD and TOC were, respectively, less than 16 mg/L and 8 mg/L while the experiment was finished.