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Kinetics and mechanism of TNT degradation in TiO2 photocatalysis.
Chemosphere. 2004 Oct; 57(4):309-17.C

Abstract

The photocatalytic degradation of TNT in a circular photocatalytic reactor, using a UV lamp as a light source and TiO(2) as a photocatalyst, was investigated. The effects of various parameters such as the initial TNT concentration, and the initial pH on the TNT degradation rate of TiO(2) photocatalysis were examined. In the presence of both UV light illumination and TiO(2) catalyst, TNT was more effectively degraded than with either UV or TiO(2) alone. The reaction rate was found to obey pseudo first-order kinetics represented by the Langmuir-Hinshelwood model. In the mineralization study, TNT (30 mg/l) photocatalytic degradation resulted in an approximately 80% TOC decrease after 150 min, and 10% of acetate and 57% of formate were produced as the organic intermediates, and were further degraded. NO(-)(3) NO(-)(2), and NH(+)(4) were detected as the nitrogen byproducts from photocatalysis and photolysis, and more than 50% of the total nitrogen was converted mainly to NO(-)(3)in the photocatalysis. However, NO(-)(3) did not adsorbed on the TiO(2) surface. TNT showed higher photocatalytic degradation efficiency at neutral and basic pH.

Authors+Show Affiliations

Institute of Health and Environment, Graduate School of Public Health, Seoul National University, 28 YeonKeon-Dong, Jongro-Gu, Seoul 110-799, South Korea.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

15312729

Citation

Son, Hyun-Seok, et al. "Kinetics and Mechanism of TNT Degradation in TiO2 Photocatalysis." Chemosphere, vol. 57, no. 4, 2004, pp. 309-17.
Son HS, Lee SJ, Cho IH, et al. Kinetics and mechanism of TNT degradation in TiO2 photocatalysis. Chemosphere. 2004;57(4):309-17.
Son, H. S., Lee, S. J., Cho, I. H., & Zoh, K. D. (2004). Kinetics and mechanism of TNT degradation in TiO2 photocatalysis. Chemosphere, 57(4), 309-17.
Son HS, et al. Kinetics and Mechanism of TNT Degradation in TiO2 Photocatalysis. Chemosphere. 2004;57(4):309-17. PubMed PMID: 15312729.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Kinetics and mechanism of TNT degradation in TiO2 photocatalysis. AU - Son,Hyun-Seok, AU - Lee,So-Jin, AU - Cho,Il-Hyoung, AU - Zoh,Kyung-Duk, PY - 2003/09/09/received PY - 2004/05/12/revised PY - 2004/05/18/accepted PY - 2004/8/18/pubmed PY - 2004/11/4/medline PY - 2004/8/18/entrez SP - 309 EP - 17 JF - Chemosphere JO - Chemosphere VL - 57 IS - 4 N2 - The photocatalytic degradation of TNT in a circular photocatalytic reactor, using a UV lamp as a light source and TiO(2) as a photocatalyst, was investigated. The effects of various parameters such as the initial TNT concentration, and the initial pH on the TNT degradation rate of TiO(2) photocatalysis were examined. In the presence of both UV light illumination and TiO(2) catalyst, TNT was more effectively degraded than with either UV or TiO(2) alone. The reaction rate was found to obey pseudo first-order kinetics represented by the Langmuir-Hinshelwood model. In the mineralization study, TNT (30 mg/l) photocatalytic degradation resulted in an approximately 80% TOC decrease after 150 min, and 10% of acetate and 57% of formate were produced as the organic intermediates, and were further degraded. NO(-)(3) NO(-)(2), and NH(+)(4) were detected as the nitrogen byproducts from photocatalysis and photolysis, and more than 50% of the total nitrogen was converted mainly to NO(-)(3)in the photocatalysis. However, NO(-)(3) did not adsorbed on the TiO(2) surface. TNT showed higher photocatalytic degradation efficiency at neutral and basic pH. SN - 0045-6535 UR - https://www.unboundmedicine.com/medline/citation/15312729/Kinetics_and_mechanism_of_TNT_degradation_in_TiO2_photocatalysis_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(04)00362-5 DB - PRIME DP - Unbound Medicine ER -