Photocatalytic degradation of sulfonylurea herbicides in aqueous TiO2

Vulliet, Emmanuelle; Emmelin, Corinne; Chovelon, Jean‐Marc; Guillard, C.; Herrmann, Jean-Marie

doi:10.1016/s0926-3373(02)00035-8

Cited by 106 publications

(50 citation statements)

References 25 publications

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“…The use of TiO 2 for environmental cleanup of organic pollutants through photooxidation has received much attention in the past decade. Various reports have been made on the degradation of pesticides using TiO 2 or modified TiO 2 in solution, as listed in Table 2 [147][148][149][150][151][152][153].…”

Section: Degradation Of Pesticidesmentioning

confidence: 99%

“…The possibility of solar photoelectrolysis was demonstrated for the first time with a system in which an n-type TiO 2 semiconductor electrode was connected through an electrical load to a platinum black counter electrode [154]. When the surface of the TiO 2 electrode was irradiated with near-UV light, photocurrent flowed from the platinum counter electrode to the TiO 2 electrode through the external circuit, showing that water can be decomposed into 19 Triasulfuron 1-[2-(2-chloroethoxy)phenylsulfonyl]-3-(4-methoxy-6-methyl-1,3,5-triazin-2-yl)urea herbicide [153] oxygen and hydrogen without the application of an external voltage. The direction of the current revealed that oxygen evolution occurred at the TiO 2 electrode and hydrogen evolution occurred at the Pt electrode.…”

Section: Production Of Hydrogen Fuelmentioning

confidence: 99%

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A review of TiO2 nanoparticles

2011

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Climate change and the consumption of non-renewable resources are considered as the greatest problems facing humankind. Because of this, photocatalysis research has been rapidly expanding. TiO 2 nanoparticles have been extensively investigated for photocatalytic applications including the decomposition of organic compounds and production of H 2 as a fuel using solar energy. This article reviews the structure and electronic properties of TiO 2 , compares TiO 2 with other common semiconductors used for photocatalytic applications and clarifies the advantages of using TiO 2 nanoparticles. TiO 2 is considered close to an ideal semiconductor for photocatalysis but possesses certain limitations such as poor absorption of visible radiation and rapid recombination of photogenerated electron/hole pairs. In this review article, various methods used to enhance the photocatalytic characteristics of TiO 2 including dye sensitization, doping, coupling and capping are discussed. Environmental and energy applications of TiO 2 , including photocatalytic treatment of wastewater, pesticide degradation and water splitting to produce hydrogen have been summarized. Historical backgroundThe growth of industry worldwide has tremendously increased the generation and accumulation of waste byproducts. In general, the production of useful products has been focused on and the generation of waste byproducts has been largely ignored. This has caused severe environmental problems that have become a major concern. Researchers all over the world have been working on various approaches to address this issue. Photoinduced processes have been studied and various applications have been developed. One important technique for removing industrial waste is the use of light energy (electromagnetic radiation) and particles sensitive to this energy to mineralize waste which aids in its removal from solution. Titanium dioxide (TiO 2 ) is considered very close to an ideal semiconductor for photocatalysis because of its high stability, low cost and safety toward both humans and the environment.*Corresponding author (email: shipra.mital@gmail.com)In 1964, Kato et al.[1] published their work on the photocatalytic oxidation of tetralin (1,2,3,4-tetrahydronaphthalene) by a TiO 2 suspension, which was followed by McLintock et al. [2] investigating the photocatalytic oxidation of ethylene and propylene in the presence of oxygen adsorbed on TiO 2 . However, the most important discovery that extensively promoted the field of photocatalysis was the "Honda-Fujishima Effect" first described by Fujishima and Honda in 1972 [3]. This well-known chemical phenomenon involves electrolysis of water, which is related to photocatalysis. Photoirradiation of a TiO 2 (rutile) single crystal electrode immersed in an aqueous electrolyte solution induced the evolution of oxygen from the TiO 2 electrode and the evolution of hydrogen from a platinum counterelectrode when an anodic bias was applied to the TiO 2 working electrode. In 1977, Frank and Bard [4] examined the reduction of ...

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Section: Degradation Of Pesticidesmentioning

confidence: 99%

Section: Production Of Hydrogen Fuelmentioning

confidence: 99%

A review of TiO2 nanoparticles

2011

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“…These compounds are ubiquitous intermediates in the degradation of aromatic compounds [24][25][26][27][28][29][30][31][32]; their degradation is thus important in the mineralization of a wide variety of pollutants.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of catalyst action in the TiO2-mediated photocatalytic degradation and cis–trans isomerization of maleic and fumaric acid

Cubbage

et al. 2004

Applied Catalysis B: Environmental

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“…TiO 2 assisted photodegradation often leads to complete mineralization and can be used to dissipate pollutants in remediation strategy [17][18][19][20]. We are interested here to study the natural photodegradation of tribenuron methyl in waters; the formation of degradation products and their identification are receiving increasing interest in laboratories involved in monitoring of surface waters and in particular of paddy waters.…”

mentioning

confidence: 99%

Hydrolytic and photoinduced degradation of tribenuron methyl studied by HPLC-DAD-MS/MS

Bottaro

Frascarolo

Gosetti

et al. 2008

J. Am. Soc. Mass Spectrom.

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The©paper©studies,©with©the©help©of©HPLC-DAD-MS/MS©technique,©the©hydrolytic©and photoinduced©degradation©processes©that©take©place©in©aqueous©solutions©of©tribenuron methyl,© both© when© preserved© in© the© dark© and© when© undergoing© solar© box© irradiation© under conditions© that© simulate© sun© light.© The© results© indicate© that© the© degradation© products© formed by© hydrolysis© alone© and© by© photoirradiation© are© the© same,© but© kinetics© of© the© hydrolysis reaction©is©much©slower.©The©degradation©products©are©identified©as©2-methoxy-4-methylamino-6-methyl-1,3,5-triazine© (P1),© methyl© 2-aminosulfonylbenzoate© (P2),© and© saccharin© (P3)© and© quantified.© Ecotoxicological© biotests© performed© on© 0.1© g L Ϫ1 photoirradiated solutions of the herbicide give a border line toxicity situation comparable to that of the precursor and indicate that the herbicide is characterized by low persistence in the environment, as required. Its degradation, however, does not lead to mineralization but to the formation of products of comparable toxicity. To evaluate the matrix effects, the photodegradation of the herbicide is also studied in the presence of rice paddy waters: the process is slower than in ultrapure water but leads to the same products. Experiments performed for comparison by irradiating ultrapure water solutions with UV lamp (254 nm) show that the degradation process is not only faster with respect to sunlight, but gives a different pathway, without in anyway leading to mineralization. T he more recent herbicide formulations are designed to offer advantages of the highest selectivity together with the lowest persistence in the environment: sulfonylurea herbicides meet these requirements. But, unfortunately, lower persistence in the environment does not necessarily correspond to lower toxicity, since many herbicides undergo natural degradation reactions in the environment that do not lead to mineralization but to the formation of new species potentially more toxic and stable than the precursors [1][2][3][4][5]. The evaluation of the degradation pathway and the structures and toxicity of the degradation products is therefore of paramount importance.The natural degradation of sulfonylurea herbicides takes place through aqueous hydrolysis reactions [6 -8], microbial processes (mainly occurring in soils) [9 -11], or photodegradation reactions [1-3, 5, 12-14]. These processes in surface waters and in soil are concomitant [7,15,16].HPLC-DAD-MS/MS methods are employed here to investigate and compare the hydrolytic and photoinduced degradation pathways of aqueous solutions of tribenuron methyl (methyl [2-4-methoxy-6-methyl-1,3,5-triazin-2-yl(methyl)carbamoyl sulfamoyl]benzoate) (Scheme 1), largely used against broad-leaved weeds in crops of cereals and in particular of rice.TiO 2 assisted photodegradation often leads to complete mineralization and can be used to dissipate pollutants in remediation strategy [17][18][19][20]. We are interested here to study the natural photodegradation of tribenuron methyl in...

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Photocatalytic degradation of sulfonylurea herbicides in aqueous TiO2

Cited by 106 publications

References 25 publications

A review of TiO2 nanoparticles

A review of TiO2 nanoparticles

Mechanisms of catalyst action in the TiO2-mediated photocatalytic degradation and cis–trans isomerization of maleic and fumaric acid

Hydrolytic and photoinduced degradation of tribenuron methyl studied by HPLC-DAD-MS/MS

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