Degradation of some biorecalcitrant pesticides by homogeneous and heterogeneous photocatalytic ozonation

Farré, María José; Franch, Maria Isabel; Malato, Sixto; Ayllón, José A.; Peral, José; Domènech, Xavier

doi:10.1016/j.chemosphere.2004.09.064

Cited by 166 publications

(78 citation statements)

References 17 publications

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“…OH (Kiwi, et al, 2000). (Agustina, et al, 2005;Farre, et al, 2005). The 2, 4-D degradation rates in O 3 and O 3 / UV/TiO 2 were about 2.3 and 4.9 times of UV/TiO 2 , while the value for O 3 /UV/TiO 2 was about 2.2 times of O 3 .…”

Section: Resultsmentioning

confidence: 81%

“…This presumably is the result of its decomposition, while the values in the O 3 process drastically increased during the first-half of the experiment and then remained almost stagnant. Farre, et al, (2005) also argued that the presence of dissolved ozone in irradiated TiO 2 aqueous suspension not only increases . OH production but also decreases the recombination of electrons and positive holes on the TiO 2 surface.…”

Section: Resultsmentioning

confidence: 99%

“…Photocatalytic ozonation (O 3 /UV/TiO 2 ) is emerging as a more promising oxidation method for refractory organic contaminants due to a large number of . OH generation (Agustina, et al, 2005;Beltran, et al, 2005;Li ,et al, 2005;Farre, et al, 2005). Few literatures are available on the O 3 /UV/TiO 2 process,because its use is relatively new, while successful use of TiO 2 fiber catalyst is expected to be a milestone in practical applications of the UV/TiO 2 and O 3 /UV/TiO 2 processes.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Photocatalytic ozonation of 2, 4-dichlorophenoxyacetic acid in water with a new TiO2 fiber

Giri

Ozaki

Taniguchi

et al. 2007

Int. J. Environ. Sci. Technol.

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More effective techniques are required to mineralize the increasing number of recalcitrant organic contaminants at low concentrations in the water environment using advanced oxidation process. Though relatively new, photocatalytic ozonation (O 3 /UV/TiO 2 ) is considered superior to ozonation (O 3 ) and photocatalysis (UV/TiO 2 ), due to synergistic effects and use of immobilized TiO 2 photocatalysts is a milestone in advance oxidation process. This article aimed to elucidate 2, 4-dichlorophenoxyacetic acid (2, 4-D) mineralization characteristics in low aqueous solutions by O 3 /UV/TiO 2 using the world's first high-strength TiO 2 fiber catalyst in laboratory experiments. 2, 4-D degradation and TOC removal in O 3 , UV/TiO 2 and O 3 /UV/TiO 2 followed pseudo-first order reaction kinetic. The removal rates for 2, 4-D and TOC in O 3 /UV/TiO 2 were respectively about 1.5 and 2.4-fold larger than the summation of the corresponding values in O 3 and UV/TiO 2 . The O 3 /UV/TiO 2 process was characterized by short-lived few aromatic intermediates, faster degradations of aliphatic intermediates and dechlorination as a major step in 2, 4-D mineralization. The significantly enhanced 2, 4-D mineralization in the process was attributed to increased ozone decomposition and reduced electron-hole recombination on TiO 2 surface resulting to a large number of . OH generation. The O 3 /UV/TiO 2 process with the TiO 2 fiber catalyst was very promising with respect to the major challenges being faced in AOP involving TiO 2 , namely separation of powder catalyst in suspension and reduced efficiency of immobilized catalysts (e.g. TiO 2 film/fiber).

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Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photocatalytic ozonation of 2, 4-dichlorophenoxyacetic acid in water with a new TiO2 fiber

Giri

Ozaki

Taniguchi

et al. 2007

Int. J. Environ. Sci. Technol.

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“…Neste sentido, o uso do ozônio combinado com metais de transição em solução ou na forma sólida (suportes/sítios ativos heterogêneos) está sendo avaliado por diferentes grupos de pesquisa 22,[32][33][34][35] . Estas técnicas e suas aplicações serão abordadas e discutidas nas próximas seções que, para efeitos didá-ticos, foram divididas em função da presença ou não de fases distintas no sistema de degradação.…”

Section: Ozôniounclassified

“…Os resultados apresentados para o metal suportado foram bastante promissores e observou-se uma total mineralização do ácido oxálico. O estudo de metais de transição na forma heterogênea (suportes/síti-os ativos heterogêneos) está sendo conduzido por diferentes grupos de pesquisa 22,34,35 e será foco da próxima seção. ).…”

Section: Ozônio Catalítico Homogêneounclassified

Métodos emergentes para aumentar a eficiência do ozônio no tratamento de águas contaminadas

Mahmoud¹,

Freire²

2007

Quím. Nova

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Recebido em 30/9/05; aceito em 6/2/06; publicado na web em 30/8/06 NEW METHODS FOR ENHANCING OZONE EFFICIENCY ON CONTAMINATED WATER TREATMENT. Many industrial processes produce effluents with a wide variety of xenobiotic organic pollutants, which cannot be efficiently degraded by conventional biological treatments. Thus, the development of new technologies to eliminate these refractory compounds in water has become very imperative in order to assure the quality of this important resource. Ozonation is a very promising process for the treatment of wastewaters containing non-easily removable organic compounds. The present work aims at highlighting new methods of enhancing the efficiency of ozone towards the removal organic pollutants in aqueous solution. Special attention is given to catalytic ozonation processes contemplating homo-and heterogeneous catalysis, their activity and mechanisms. Recent results and future prospects about the application of these processes to real effluents are also evaluated.Keywords: catalytic ozonation; environmental chemistry; advanced oxidation processes. INTRODUÇÃODesde as últimas décadas do século passado, a sociedade tem adquirido uma conscientização crescente a respeito dos problemas ambientais e seus efeitos para a qualidade de vida desta e das futuras gerações. Apesar disso, a integridade de vários ecossistemas vem sendo afetada, de maneira preocupante, por uma série de atividades antropogênicas, levando a um risco de degradação irreversível do meio ambiente.Neste panorama, as preocupações com o uso e a qualidade da água adquirem especial importância devido à relevância deste recurso e ao aumento desenfreado de sua demanda, resultante principalmente do crescimento acelerado da população e estilo de vida da sociedade contemporânea (que dentre outras coisas, prima por padrões de conforto e bem-estar em detrimento do equilíbrio dos recursos naturais). De fato, é difícil imaginar qualquer tipo de organização dos seres humanos em sociedade que dispense o uso da água, uma vez que esta substância é essencial não somente para a manutenção das atividades biológicas básicas (a água compõe parte significativa das células de todos os seres vivos, estando envolvida em processos de transporte de nutrientes e dejetos; manutenção de temperatura; produção e armazenamento de energia, etc.), mas também para o desenvolvimento das atividades produtivas (agrícolas ou industriais).Talvez por ser relativamente abundante, a água tornou-se tão banal que sua presença, embora indispensável, não desperta a merecida atenção e valorização. Apesar da água ser um recurso natural renovável (qualquer que seja seu uso, no final ela é restituída ao ambiente/origem), durante muito tempo teve-se uma concepção errônea de inesgotabilidade desta substância. Embora seja verdade que o homem não faça a água simplesmente desaparecer da natureza (como tem feito com florestas e algumas reservas minerais), a qualidade de uma infinidade de recursos hídricos tem sido seriamente comprometida 1,2 .Dentre as várias atividades ant...

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Advanced Oxidation Processes

2009

White's Handbook of Chlorination and Alternative Disinfectants

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There is a great interest in the synthesis of various nanosized green reusable catalysts which would better assist various chemical reactions in industrially important technologies. Heterogeneous catalysts are widely used in advanced oxidation processes. Its can remove organic pollutants in wastewater effluents by facilitting their degradation through ozonization, photolysis, semiconductor photocatalysis, electrochemical treatment and Fenton's oxidation. In the case of using Fenton´s oxidation. Pulsed laser irradiation of iron and cobalt sulfides in different enviroments allows laser ablation and generation of FeS, CoS2 nano/micro particles. The FeS and CoS2-based films deposited on Ta deposited on Cu were examined for their catalytic effect in Fenton degradation of methylene blue (MB). However, there is still necessary presence of additional H2O2 which is expensive for wider industrial application. Therefore, these substances are tested for their photocatalytic properties.

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Degradation of some biorecalcitrant pesticides by homogeneous and heterogeneous photocatalytic ozonation

Cited by 166 publications

References 17 publications

Photocatalytic ozonation of 2, 4-dichlorophenoxyacetic acid in water with a new TiO2 fiber

Photocatalytic ozonation of 2, 4-dichlorophenoxyacetic acid in water with a new TiO2 fiber

Métodos emergentes para aumentar a eficiência do ozônio no tratamento de águas contaminadas

Advanced Oxidation Processes

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