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Sonophotocatalytic degradation of monocrotophos using TiO2 and Fe3+.
J Hazard Mater. 2010 May 15; 177(1-3):944-9.JH

Abstract

Monocrotophos (MCP) is an organophosphate insecticide that has been found as a pollutant in aqueous environments. The sonolytic, photocatalytic and sonophotocatalytic degradation of MCP in the presence of homogeneous (Fe(3+)) and heterogeneous photocatalysts (TiO(2)) were studied. The photocatalytic degradation rate using TiO(2) was found to be lower than that of sonolysis alone due to the interference of phosphate ions formed as an intermediate product. On the other hand, a 15 fold enhancement in the degradation rate was found when photolysis was carried out in the presence of Fe(3+) compared to the rate observed with photolysis alone. The combination of sonolysis and photocatalysis (using either TiO(2) or Fe(3+)) showed a detrimental effect. Synergy indices of 0.62 and 0.87 were found for the sonophotocatalytic degradation of MCP in the presence of TiO(2) and Fe(3+), respectively. Total organic carbon (TOC) analysis was carried out to study the extent of mineralization of MCP. It was found that the mineralization process was additive for both TiO(2) and Fe(3+) sonophotocatalysis. HPLC and electrospray mass spectrometry (ESMS) techniques were employed for the identification of the degradation intermediates. The sonication of MCP led to the formation of dimethyl phosphate, dimethylphosphonate, 3-hydroxy 2-buteneamide and N-methyl 3-oxobutanamide as the intermediate products.

Authors+Show Affiliations

Particulate Fluids Processing Centre, School of Chemistry, University of Melbourne, Grattan Street, Melbourne, VIC 3010, Australia.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

20096998

Citation

Madhavan, Jagannathan, et al. "Sonophotocatalytic Degradation of Monocrotophos Using TiO2 and Fe3+." Journal of Hazardous Materials, vol. 177, no. 1-3, 2010, pp. 944-9.
Madhavan J, Sathish Kumar PS, Anandan S, et al. Sonophotocatalytic degradation of monocrotophos using TiO2 and Fe3+. J Hazard Mater. 2010;177(1-3):944-9.
Madhavan, J., Sathish Kumar, P. S., Anandan, S., Grieser, F., & Ashokkumar, M. (2010). Sonophotocatalytic degradation of monocrotophos using TiO2 and Fe3+. Journal of Hazardous Materials, 177(1-3), 944-9. https://doi.org/10.1016/j.jhazmat.2010.01.009
Madhavan J, et al. Sonophotocatalytic Degradation of Monocrotophos Using TiO2 and Fe3+. J Hazard Mater. 2010 May 15;177(1-3):944-9. PubMed PMID: 20096998.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sonophotocatalytic degradation of monocrotophos using TiO2 and Fe3+. AU - Madhavan,Jagannathan, AU - Sathish Kumar,Panneer Selvam, AU - Anandan,Sambandam, AU - Grieser,Franz, AU - Ashokkumar,Muthupandian, Y1 - 2010/01/11/ PY - 2009/09/27/received PY - 2009/12/26/revised PY - 2010/01/04/accepted PY - 2010/1/26/entrez PY - 2010/1/26/pubmed PY - 2010/6/10/medline SP - 944 EP - 9 JF - Journal of hazardous materials JO - J Hazard Mater VL - 177 IS - 1-3 N2 - Monocrotophos (MCP) is an organophosphate insecticide that has been found as a pollutant in aqueous environments. The sonolytic, photocatalytic and sonophotocatalytic degradation of MCP in the presence of homogeneous (Fe(3+)) and heterogeneous photocatalysts (TiO(2)) were studied. The photocatalytic degradation rate using TiO(2) was found to be lower than that of sonolysis alone due to the interference of phosphate ions formed as an intermediate product. On the other hand, a 15 fold enhancement in the degradation rate was found when photolysis was carried out in the presence of Fe(3+) compared to the rate observed with photolysis alone. The combination of sonolysis and photocatalysis (using either TiO(2) or Fe(3+)) showed a detrimental effect. Synergy indices of 0.62 and 0.87 were found for the sonophotocatalytic degradation of MCP in the presence of TiO(2) and Fe(3+), respectively. Total organic carbon (TOC) analysis was carried out to study the extent of mineralization of MCP. It was found that the mineralization process was additive for both TiO(2) and Fe(3+) sonophotocatalysis. HPLC and electrospray mass spectrometry (ESMS) techniques were employed for the identification of the degradation intermediates. The sonication of MCP led to the formation of dimethyl phosphate, dimethylphosphonate, 3-hydroxy 2-buteneamide and N-methyl 3-oxobutanamide as the intermediate products. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/20096998/Sonophotocatalytic_degradation_of_monocrotophos_using_TiO2_and_Fe3+_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(10)00025-7 DB - PRIME DP - Unbound Medicine ER -