Photocatalytic degradation of a widely used insecticide Thiamethoxam in aqueous suspension of TiO2: Adsorption, kinetics, product analysis and toxicity assessment

Niyaz A. Mir; A. Khan; M. Muneer; S. Vijayalakhsmi

doi:10.1016/j.scitotenv.2013.04.041

Photocatalytic degradation of a widely used insecticide Thiamethoxam in aqueous suspension of TiO₂: Adsorption, kinetics, product analysis and toxicity assessment

Niyaz A. Mir, A. Khan, M. Muneer^*, S. Vijayalakhsmi

^*Corresponding author for this work

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

88 Scopus citations

Abstract

This paper deals with the study of photocatalyzed degradation of an insecticide, Thiamethoxam in aqueous suspension of TiO₂. The adsorption of Thiamethoxam on TiO₂ surface under dark conditions was also investigated in order to find out equilibrium adsorption constant. The degradation kinetics was studied using spectrophotometric method under various conditions such as substrate concentration, type of catalyst, catalyst dosage, pH, and in the presence of electron acceptors such as hydrogen peroxide, potassium bromate, and ammonium persulphate under continuous purging of atmospheric oxygen, and the degradation rates were found to be strongly influenced by these parameters. The results manifested that the photocatalysis of Thiamethoxam follows pseudo-first-order kinetics. The toxicity assessments of the irradiated samples were carried out using human erythrocytes as a model system under in vitro conditions. GC-MS study showed the formation of several intermediate products which were characterised based on their molecular mass and mass fragmentation pattern. A probable mechanism for the formation of various products formed during the photocatalytic process of Thiamethoxam was also proposed.

Original language	English
Pages (from-to)	388-398
Number of pages	11
Journal	Science of the Total Environment
Volume	458-460
DOIs	https://doi.org/10.1016/j.scitotenv.2013.04.041
State	Published - 1 Aug 2013
Externally published	Yes

Bibliographical note

Funding Information:
Financial supports from UGC, New Delhi and CSTUP, Lucknowfor Research Project grants, DRS-1 (SAP) from UGC New Delhi to the Department of Chemistry, Aligarh Muslim University, Aligarh and the Award of Junior Research Fellowship from UGC to Niyaz A. Mir are gratefully acknowledged. The authors are also thankful to Mir Kaisar Ahmad, Department of Biochemistry, Aligarh Muslim University, Aligarh, for Toxicity assessment experiments. Total Organic Carbon analyzer (TOC) was a gift instrument from the Alexander von Humboldt foundation, Bonn, Germany.

Keywords

GC-MS
Photocatalysis
Semiconductor
Thiamethoxam
TiO

ASJC Scopus subject areas

Environmental Engineering
Environmental Chemistry
Waste Management and Disposal
Pollution

Access to Document

10.1016/j.scitotenv.2013.04.041

Cite this

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title = "Photocatalytic degradation of a widely used insecticide Thiamethoxam in aqueous suspension of TiO2: Adsorption, kinetics, product analysis and toxicity assessment",

abstract = "This paper deals with the study of photocatalyzed degradation of an insecticide, Thiamethoxam in aqueous suspension of TiO2. The adsorption of Thiamethoxam on TiO2 surface under dark conditions was also investigated in order to find out equilibrium adsorption constant. The degradation kinetics was studied using spectrophotometric method under various conditions such as substrate concentration, type of catalyst, catalyst dosage, pH, and in the presence of electron acceptors such as hydrogen peroxide, potassium bromate, and ammonium persulphate under continuous purging of atmospheric oxygen, and the degradation rates were found to be strongly influenced by these parameters. The results manifested that the photocatalysis of Thiamethoxam follows pseudo-first-order kinetics. The toxicity assessments of the irradiated samples were carried out using human erythrocytes as a model system under in vitro conditions. GC-MS study showed the formation of several intermediate products which were characterised based on their molecular mass and mass fragmentation pattern. A probable mechanism for the formation of various products formed during the photocatalytic process of Thiamethoxam was also proposed.",

keywords = "GC-MS, Photocatalysis, Semiconductor, Thiamethoxam, TiO",

author = "Mir, \{Niyaz A.\} and A. Khan and M. Muneer and S. Vijayalakhsmi",

note = "Funding Information: Financial supports from UGC, New Delhi and CSTUP, Lucknowfor Research Project grants, DRS-1 (SAP) from UGC New Delhi to the Department of Chemistry, Aligarh Muslim University, Aligarh and the Award of Junior Research Fellowship from UGC to Niyaz A. Mir are gratefully acknowledged. The authors are also thankful to Mir Kaisar Ahmad, Department of Biochemistry, Aligarh Muslim University, Aligarh, for Toxicity assessment experiments. Total Organic Carbon analyzer (TOC) was a gift instrument from the Alexander von Humboldt foundation, Bonn, Germany.",

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doi = "10.1016/j.scitotenv.2013.04.041",

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T2 - Adsorption, kinetics, product analysis and toxicity assessment

AU - Mir, Niyaz A.

AU - Khan, A.

AU - Muneer, M.

AU - Vijayalakhsmi, S.

N1 - Funding Information: Financial supports from UGC, New Delhi and CSTUP, Lucknowfor Research Project grants, DRS-1 (SAP) from UGC New Delhi to the Department of Chemistry, Aligarh Muslim University, Aligarh and the Award of Junior Research Fellowship from UGC to Niyaz A. Mir are gratefully acknowledged. The authors are also thankful to Mir Kaisar Ahmad, Department of Biochemistry, Aligarh Muslim University, Aligarh, for Toxicity assessment experiments. Total Organic Carbon analyzer (TOC) was a gift instrument from the Alexander von Humboldt foundation, Bonn, Germany.

PY - 2013/8/1

Y1 - 2013/8/1

N2 - This paper deals with the study of photocatalyzed degradation of an insecticide, Thiamethoxam in aqueous suspension of TiO2. The adsorption of Thiamethoxam on TiO2 surface under dark conditions was also investigated in order to find out equilibrium adsorption constant. The degradation kinetics was studied using spectrophotometric method under various conditions such as substrate concentration, type of catalyst, catalyst dosage, pH, and in the presence of electron acceptors such as hydrogen peroxide, potassium bromate, and ammonium persulphate under continuous purging of atmospheric oxygen, and the degradation rates were found to be strongly influenced by these parameters. The results manifested that the photocatalysis of Thiamethoxam follows pseudo-first-order kinetics. The toxicity assessments of the irradiated samples were carried out using human erythrocytes as a model system under in vitro conditions. GC-MS study showed the formation of several intermediate products which were characterised based on their molecular mass and mass fragmentation pattern. A probable mechanism for the formation of various products formed during the photocatalytic process of Thiamethoxam was also proposed.

AB - This paper deals with the study of photocatalyzed degradation of an insecticide, Thiamethoxam in aqueous suspension of TiO2. The adsorption of Thiamethoxam on TiO2 surface under dark conditions was also investigated in order to find out equilibrium adsorption constant. The degradation kinetics was studied using spectrophotometric method under various conditions such as substrate concentration, type of catalyst, catalyst dosage, pH, and in the presence of electron acceptors such as hydrogen peroxide, potassium bromate, and ammonium persulphate under continuous purging of atmospheric oxygen, and the degradation rates were found to be strongly influenced by these parameters. The results manifested that the photocatalysis of Thiamethoxam follows pseudo-first-order kinetics. The toxicity assessments of the irradiated samples were carried out using human erythrocytes as a model system under in vitro conditions. GC-MS study showed the formation of several intermediate products which were characterised based on their molecular mass and mass fragmentation pattern. A probable mechanism for the formation of various products formed during the photocatalytic process of Thiamethoxam was also proposed.

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