Heterogeneous photocatalysed degradation of two selected pesticide derivatives, triclopyr and daminozid in aqueous suspensions of titanium dioxide

M. Qamar; M. Muneer; D. Bahnemann

doi:10.1016/j.jenvman.2005.09.002

Heterogeneous photocatalysed degradation of two selected pesticide derivatives, triclopyr and daminozid in aqueous suspensions of titanium dioxide

M. Qamar
, M. Muneer^*
, D. Bahnemann

^*Corresponding author for this work

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

121 Scopus citations

Abstract

Heterogeneous photocatalysed degradation of two selected pesticide derivatives, triclopyr (1) and daminozid (2), has been investigated in aqueous suspensions of titanium dioxide by monitoring the change in substrate concentration employing the UV Spectroscopic analysis technique and depletion of Total Organic Carbon (TOC) content as a function of irradiation time. The degradation kinetics were studied under different conditions such as reaction pH, substrate and catalyst concentration, different types of TiO₂ and in the presence of electron acceptors such as hydrogen peroxide (H₂O₂), potassium bromate (KBrO₃) and ammonium persulphate (NH₄)₂S₂O₈ in addition to molecular oxygen. The degradation rates were found to be strongly influenced by all the above parameters. The photocatalyst Degussa P25 was found to be more efficient as compared with other photocatalysts. The pesticide derivative triclopyr (1) was found to degrade faster as compared to daminozid (2). An attempt was also made to identify the intermediate products formed during the photooxidation process using GC/MS analysis. Probable pathways for the formation of products have been proposed.

Original language	English
Pages (from-to)	99-106
Number of pages	8
Journal	Journal of Environmental Management
Volume	80
Issue number	2
DOIs	https://doi.org/10.1016/j.jenvman.2005.09.002
State	Published - Jul 2006
Externally published	Yes

Bibliographical note

Funding Information:
Financial support from Alexander von Humboldt Stiftung, Bonn, Germany, Third World Academy of Sciences (TWAS), Department of Science and Technology, New Delhi, India and Department of Chemistry Aligarh Muslim University, Aligarh, India, is gratefully acknowledged. Total Organic Carbon (TOC) Analyzer used for the analysis of the samples was a gift instrument from the Alexander von Humboldt Foundation, Bonn, Germany.

Keywords

Daminozid
Photocatalysis
Titanium dioxide
Triclopyr

ASJC Scopus subject areas

Environmental Engineering
Waste Management and Disposal
Management, Monitoring, Policy and Law

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10.1016/j.jenvman.2005.09.002

Cite this

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title = "Heterogeneous photocatalysed degradation of two selected pesticide derivatives, triclopyr and daminozid in aqueous suspensions of titanium dioxide",

abstract = "Heterogeneous photocatalysed degradation of two selected pesticide derivatives, triclopyr (1) and daminozid (2), has been investigated in aqueous suspensions of titanium dioxide by monitoring the change in substrate concentration employing the UV Spectroscopic analysis technique and depletion of Total Organic Carbon (TOC) content as a function of irradiation time. The degradation kinetics were studied under different conditions such as reaction pH, substrate and catalyst concentration, different types of TiO2 and in the presence of electron acceptors such as hydrogen peroxide (H2O2), potassium bromate (KBrO3) and ammonium persulphate (NH4)2S2O8 in addition to molecular oxygen. The degradation rates were found to be strongly influenced by all the above parameters. The photocatalyst Degussa P25 was found to be more efficient as compared with other photocatalysts. The pesticide derivative triclopyr (1) was found to degrade faster as compared to daminozid (2). An attempt was also made to identify the intermediate products formed during the photooxidation process using GC/MS analysis. Probable pathways for the formation of products have been proposed.",

keywords = "Daminozid, Photocatalysis, Titanium dioxide, Triclopyr",

author = "M. Qamar and M. Muneer and D. Bahnemann",

note = "Funding Information: Financial support from Alexander von Humboldt Stiftung, Bonn, Germany, Third World Academy of Sciences (TWAS), Department of Science and Technology, New Delhi, India and Department of Chemistry Aligarh Muslim University, Aligarh, India, is gratefully acknowledged. Total Organic Carbon (TOC) Analyzer used for the analysis of the samples was a gift instrument from the Alexander von Humboldt Foundation, Bonn, Germany.",

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doi = "10.1016/j.jenvman.2005.09.002",

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AU - Bahnemann, D.

N1 - Funding Information: Financial support from Alexander von Humboldt Stiftung, Bonn, Germany, Third World Academy of Sciences (TWAS), Department of Science and Technology, New Delhi, India and Department of Chemistry Aligarh Muslim University, Aligarh, India, is gratefully acknowledged. Total Organic Carbon (TOC) Analyzer used for the analysis of the samples was a gift instrument from the Alexander von Humboldt Foundation, Bonn, Germany.

PY - 2006/7

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N2 - Heterogeneous photocatalysed degradation of two selected pesticide derivatives, triclopyr (1) and daminozid (2), has been investigated in aqueous suspensions of titanium dioxide by monitoring the change in substrate concentration employing the UV Spectroscopic analysis technique and depletion of Total Organic Carbon (TOC) content as a function of irradiation time. The degradation kinetics were studied under different conditions such as reaction pH, substrate and catalyst concentration, different types of TiO2 and in the presence of electron acceptors such as hydrogen peroxide (H2O2), potassium bromate (KBrO3) and ammonium persulphate (NH4)2S2O8 in addition to molecular oxygen. The degradation rates were found to be strongly influenced by all the above parameters. The photocatalyst Degussa P25 was found to be more efficient as compared with other photocatalysts. The pesticide derivative triclopyr (1) was found to degrade faster as compared to daminozid (2). An attempt was also made to identify the intermediate products formed during the photooxidation process using GC/MS analysis. Probable pathways for the formation of products have been proposed.

AB - Heterogeneous photocatalysed degradation of two selected pesticide derivatives, triclopyr (1) and daminozid (2), has been investigated in aqueous suspensions of titanium dioxide by monitoring the change in substrate concentration employing the UV Spectroscopic analysis technique and depletion of Total Organic Carbon (TOC) content as a function of irradiation time. The degradation kinetics were studied under different conditions such as reaction pH, substrate and catalyst concentration, different types of TiO2 and in the presence of electron acceptors such as hydrogen peroxide (H2O2), potassium bromate (KBrO3) and ammonium persulphate (NH4)2S2O8 in addition to molecular oxygen. The degradation rates were found to be strongly influenced by all the above parameters. The photocatalyst Degussa P25 was found to be more efficient as compared with other photocatalysts. The pesticide derivative triclopyr (1) was found to degrade faster as compared to daminozid (2). An attempt was also made to identify the intermediate products formed during the photooxidation process using GC/MS analysis. Probable pathways for the formation of products have been proposed.

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KW - Titanium dioxide

KW - Triclopyr

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Heterogeneous photocatalysed degradation of two selected pesticide derivatives, triclopyr and daminozid in aqueous suspensions of titanium dioxide

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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