Continuous flow photocatalytic degradation of carbaryl in aqueous media

Peris-Cardells, E.; Terol, José Manuel Barrio; Mauri, A. R.; Guárdia, Miguel de la; Pramauro, Edmondo

doi:10.1080/03601239309372834

Cited by 21 publications

(10 citation statements)

References 2 publications

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“…TiO2 [152] TiO2 [153] Scala® Solar photo-fenton [68] phosphamidon TiO2 and ZnO [154] Bromophos methyl Aqueous TiO2 suspension [62] chlorophenol pesticides Aqueous TiO2 suspension [61] chlortoluron Coated TiO2 [63] cyproconazole Coated TiO2 [63] fenitrothion TiO2 [7] DDT Aqueous TiO2 dispersion [155] August 2014 | Volume 1 | e713 application (suspended vs. immobilized system), influence of catalyst doping on the overall degradation process. Another review of Devipriya and Yesodharan, (2005) [7] reports the detail mechanism of photodegradation process and several case studies on different group of insecticides like, OP insecticides, organochlorine insecticides, carbamate insecticides, numerous herbicides (bentazone, carbetamide, monuron, S-triazines) and several fungicides (Pyrimethanil, chlorothalonil, diclofuanid, carboxin, oxycarboxin) using TiO 2 and ZnO.…”

Section: Name Of Pesticides Catalyst Used Referencementioning

confidence: 99%

Application Photocatalysis for Treatment of Industrial Waste Water—A Short Review

Das¹

2014

OALib

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Occurrence of persistent organic compounds in industrial effluents and their efficient removal technique has emerged as a crucial problem to waste water treatment plants. This review aims to focus on the plight associated with the effluents from textile industry, agricultural and pharmaceutical effluents. The occurrence of dyes, pesticides and endocrine disrupting chemicals in aquatic ecosystems may cause chronic diseases, affect the human endocrine system and have appeared as crucial factor to consider for drinking and non-potable end uses of water. Extensive researches have been attempted to screen effective and safe method of contaminants removal by modifying conventional treatments as well as advanced processes by renowned authors. This paper aims to review different possible routes of effluent treatment emphasizing on complete mineralization of the targeted contaminants. With this purpose, a comprehensive review has been presented to deliver essential information about dealing with photocatalytic mineralization of pollutants.

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Section: Name Of Pesticides Catalyst Used Referencementioning

confidence: 99%

Application Photocatalysis for Treatment of Industrial Waste Water—A Short Review

Das¹

2014

OALib

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“…These systems also show great potential for the development of greener analytical procedures, with the replacement of toxic reagents, 9-11 the minimization of reagent consumption with multicommutation systems 12,13 and standstill reagents, 14,15 the reuse of waste generated, 16,17 and the treatment of waste. [18][19][20] A flow procedure based on chemiluminescence 1 was developed, exploiting the reaction of luminol with ferricyanide in a sodium hydroxide medium sensitized by gossypol. The method was applied to pharmaceutical preparations and cottonseeds.…”

Section: Introductionmentioning

confidence: 99%

An Environmental Friendly Flow-Injection Procedure for On Line Extraction and Spectrophotometric Determination of Gossypol in Cottonseed Meal

Daminato

Kamogawa

Melchert

2017

J. Braz. Chem. Soc.

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A fast, simple and inexpensive procedure is described for the determination of gossypol in cottonseed meal. The procedure is based on a flow injection analysis system and a complexation reaction with spectrophotometric detection at 620 nm. A fluidized bed column was used to implement the on line that was coupled to the extraction flow system in order to analyze the solid samples directly. A linear response was observed from 0.96 to 3.85 mmol L -1 , and the detection limit, the coefficient of variation and the sampling rate were estimated at 100 µmol L -1 (99.7% confidence level), 1.90% (n = 20) and 30 h -1 , respectively. The reagent consumption was 1.08 mg of Fe(NO 3 ) 3 , with a volume of 20 mL of effluent per determination. Analyses of the results of commercial samples were consistent with through the official procedure of detoxification of cottonseed meal as described by American Oil Chemists' Society (AOCS) at the 95% confidence level. Keywords: gossypol, flow analysis, spectrophotometric detection IntroductionCottonseed meal is obtained in the oil extraction process. It is high in protein, fiber and minerals and can be used as a fertilizer and animal feed. However, its use is limited by the presence of the polyphenolic yellow compound known as gossypol.1 Gossypol (2,2'-bis(8-formyl-1,6,7-trihydroxy-5-isopropyl-3-methylnaphthalene) is a toxic pigment that occurs in various parts of cotton plants. 2 It is undesirable for different animal species, especially for poultry and swine. 3 Several procedures have been described in the literature for the analysis of gossypol, including procedures based on high performance liquid chromatography (HPLC), 4,5 enzyme-linked immunosorbent assay 6 and Fourier transform infrared spectroscopy (FTIR). 7 The spectrophotometric determination of gossypol can be performed using 3-amino-1-propanol and its subsequent complexation with iron(III), forming a green-colored complex with maximum absorption at 620 nm. To extract the analyte from the cottonseeds, 80 mL of hexane-isopropyl alcohol is used per determination.2 Another procedure is based on secondderivative ultraviolet spectrophotometry and it involves the extraction of free gossypol using aqueous acetone, hydrolysis of the soluble-bound forms with hydrochloric acid and the partitioning of the pure compound into chloroform. The proposed method showed good precision (4.0%), but a large amount of organic solvents was used (50 mL acetone and 50 mL chloroform) and a lot of time was spent (2 h) on each sample.8 These drawbacks hinder the use of these procedures for routine analysis.Flow-injection systems (FIA) have been employed especially for the mechanization of analytical procedures in order to minimize the analyst intervention and enhance the number of samples processed by time and improving precision. In the preparation of samples, FIA can be used to minimize risks of sample contamination and amounts of organic solvents, as well as reduce costs of analysis. These systems also show great potential for the development of greener ...

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“…The principal strategies employed in green chemistry were explored to achieve A substituição de reagentes tóxicos é a principal alternativa para o desenvolvimento de procedimentos analíticos mais limpos, tendo sido explorada, por exemplo, em procedimentos em fluxo para a determinação de amônio [20][21][22][23] . Porém, nem todos os reagentes podem ser substituídos e os sistemas de análises em fluxo podem ser empregados para a minimização do consumo de reagentes utilizando algumas estratégias como os sistemas com multicomutação 24,25 , sistemas de análise por injeção seqüencial 26 e imobilização de reagentes 27,28 ; na reciclagem dos resíduos gerados 29,30 e no tratamento em linha desses resíduos [31][32][33][34] .…”

Section: Introductionunclassified

“…Desempenho analítico e consumo de reagentes em diferentes sistemas para determinação espectrofotométrica de carbaril com p-aminofenol (PAP)25 .Devido à usualmente alta toxicidade, as preocupações com os resíduos gerados nos laboratórios de pesquisa vêm aumentando e etapas de reciclagem ou reutilização desses resíduos devem ser incluídas nos novos procedimentos visando atingir os requisitos da química limpa. Neste contexto, pesquisadores espanhóis da Universidade de Valência estudaram a degradação em linha dos resíduos gerados em sistemas de análises em fluxo32,33,61 como também a reciclagem dos resíduos tóxicos29,30 .Um método analítico limpo foi proposto para determinação de propoxur, um pesticida carbamato, empregando p-aminofenol como reagente em um sistema de análises em fluxo31 . Após a cela de medida, o efluente gerado foi diluído com água e irradiado (reator de PTFE de 6 m) com radiação ultravioleta (λ MAX =254 nm) seguido pela mistura com uma suspensão de TiO 2 e nova irradiação em um reator de 12 m para a degradação dos Introdução resíduos.…”

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“…A hidrólise do formetanato foi realizada em linha em um reator localizado dentro de um forno de microondas. Após a medida, o resíduo gerado foi misturado com uma suspensão de TiO 2 e irradiado em 254 nm em um reator de 4 m. Peris-Cardells et al32 propuseram um método para degradação fotocatalítica de carbaril com suspensão de TiO 2 em sistema de análises em fluxo usando um reator fotoquímico equipado com lâmpada UV. Após 1 minuto de irradiação, mais de 99 % do carbaril presente inicialmente (0,2 mg/L) foi decomposto.…”

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Desenvolvimento de procedimentos analíticos limpos em sistemas de análises em fluxo para determinação de espécies de interesse ambiental

Melchert¹

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Continuous flow photocatalytic degradation of carbaryl in aqueous media

Cited by 21 publications

References 2 publications

Application Photocatalysis for Treatment of Industrial Waste Water—A Short Review

Application Photocatalysis for Treatment of Industrial Waste Water—A Short Review

An Environmental Friendly Flow-Injection Procedure for On Line Extraction and Spectrophotometric Determination of Gossypol in Cottonseed Meal

Desenvolvimento de procedimentos analíticos limpos em sistemas de análises em fluxo para determinação de espécies de interesse ambiental

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