Photocatalytic degradation of nitrotoluene in aqueous TiO2 suspension

Muhammad Shariq Vohra; Keiichi Tanaka

doi:10.1016/S0043-1354(01)00190-7

Photocatalytic degradation of nitrotoluene in aqueous TiO₂ suspension

Muhammad Shariq Vohra
, Keiichi Tanaka^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

57 Scopus citations

Abstract

TiO₂-mediated photocatalytic degradation process was employed to treat aqueous 2-, 3- and 4-NT (nitrotoluene) pollutants. The NT disappearance and TOC removal rates for three isomers showed no significant differences. Three hydroxylated aromatic intermediates resulting from the photocatalytic degradation of 4-NT were identified; this suggested two (initial) degradation pathways. Formation of acetic acid, formic acid, and formaldehyde was also noted. The mineralization products included NH₄⁺, NO₃^- and CO₂. N₂ bubbling or the presence of a positive hole acceptor during 4-NT degradation resulted in a high 4-aminotoluene formation. This indicated an effective reduction of 4-NT's nitro group to amino moiety. Generally, Pt-loaded TiO₂ (Pt-TiO₂) had no influence on the disappearance rate of 4-NT. However, the use of Pt-TiO₂ along with a higher light intensity source resulted in an accelerated TOC removal.

Original language	English
Pages (from-to)	59-64
Number of pages	6
Journal	Water Research
Volume	36
Issue number	1
DOIs	https://doi.org/10.1016/S0043-1354(01)00190-7
State	Published - 2002
Externally published	Yes

Keywords

Nitrotoluene
Photocatalysis
Pt-loading
TiO

ASJC Scopus subject areas

Environmental Engineering
Civil and Structural Engineering
Ecological Modeling
Water Science and Technology
Waste Management and Disposal
Pollution

Access to Document

10.1016/S0043-1354(01)00190-7

Cite this

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title = "Photocatalytic degradation of nitrotoluene in aqueous TiO2 suspension",

abstract = "TiO2-mediated photocatalytic degradation process was employed to treat aqueous 2-, 3- and 4-NT (nitrotoluene) pollutants. The NT disappearance and TOC removal rates for three isomers showed no significant differences. Three hydroxylated aromatic intermediates resulting from the photocatalytic degradation of 4-NT were identified; this suggested two (initial) degradation pathways. Formation of acetic acid, formic acid, and formaldehyde was also noted. The mineralization products included NH4+, NO3- and CO2. N2 bubbling or the presence of a positive hole acceptor during 4-NT degradation resulted in a high 4-aminotoluene formation. This indicated an effective reduction of 4-NT's nitro group to amino moiety. Generally, Pt-loaded TiO2 (Pt-TiO2) had no influence on the disappearance rate of 4-NT. However, the use of Pt-TiO2 along with a higher light intensity source resulted in an accelerated TOC removal.",

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AU - Tanaka, Keiichi

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N2 - TiO2-mediated photocatalytic degradation process was employed to treat aqueous 2-, 3- and 4-NT (nitrotoluene) pollutants. The NT disappearance and TOC removal rates for three isomers showed no significant differences. Three hydroxylated aromatic intermediates resulting from the photocatalytic degradation of 4-NT were identified; this suggested two (initial) degradation pathways. Formation of acetic acid, formic acid, and formaldehyde was also noted. The mineralization products included NH4+, NO3- and CO2. N2 bubbling or the presence of a positive hole acceptor during 4-NT degradation resulted in a high 4-aminotoluene formation. This indicated an effective reduction of 4-NT's nitro group to amino moiety. Generally, Pt-loaded TiO2 (Pt-TiO2) had no influence on the disappearance rate of 4-NT. However, the use of Pt-TiO2 along with a higher light intensity source resulted in an accelerated TOC removal.

AB - TiO2-mediated photocatalytic degradation process was employed to treat aqueous 2-, 3- and 4-NT (nitrotoluene) pollutants. The NT disappearance and TOC removal rates for three isomers showed no significant differences. Three hydroxylated aromatic intermediates resulting from the photocatalytic degradation of 4-NT were identified; this suggested two (initial) degradation pathways. Formation of acetic acid, formic acid, and formaldehyde was also noted. The mineralization products included NH4+, NO3- and CO2. N2 bubbling or the presence of a positive hole acceptor during 4-NT degradation resulted in a high 4-aminotoluene formation. This indicated an effective reduction of 4-NT's nitro group to amino moiety. Generally, Pt-loaded TiO2 (Pt-TiO2) had no influence on the disappearance rate of 4-NT. However, the use of Pt-TiO2 along with a higher light intensity source resulted in an accelerated TOC removal.

KW - Nitrotoluene

KW - Photocatalysis

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