Sonophotocatalytic degradation of monocrotophos using TiO2 and Fe3+

被引：83

作者：

Madhavan, Jagannathan ^{[1
]}

Sathishkumar, Panneerselvam ^{[1
,2
]}

Anandan, Sambandam ^{[2
]}

Grieser, Franz ^{[1
]}

Ashokkumar, Muthupandian ^{[1
]}

机构：

[1] Univ Melbourne, Sch Chem, Particulate Fluids Proc Ctr, Melbourne, Vic 3010, Australia

[2] Natl Inst Technol, Dept Chem, Nanomat & Solar Energy Convers Lab, Tiruchirappalli 620015, India

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2010年 / 177卷 / 1-3期

关键词：

Sonolysis; Photocatalysis; Fenton; Sonophotocatalysis; Monocrotophos; AQUEOUS PESTICIDE DEGRADATION; ADVANCED OXIDATION PROCESSES; SONOCHEMICAL DEGRADATION; PHOTOCATALYTIC DEGRADATION; FENTON DEGRADATION; TITANIUM-DIOXIDE; MALACHITE-GREEN; HIGH-FREQUENCY; PHOTO-FENTON; WATER;

D O I：

10.1016/j.jhazmat.2010.01.009

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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 (Fe3+) and heterogeneous photocatalysts (TiO2) were studied. The photocatalytic degradation rate using TiO2 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 Fe3+ compared to the rate observed with photolysis alone. The combination of sonolysis and photocatalysis (using either TiO2 or Fe3+) showed a detrimental effect. Synergy indices of 0.62 and 0.87 were found for the sonophotocatalytic degradation of MCP in the presence of TiO2 and Fe3+, 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 TiO2 and Fe3+ 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. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：944 / 949

页数：6

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