The Rate Constant of the Reaction between Hydrogen Peroxide and Ferrous Ions

Rigg, Tyson; Taylor, W. A.; Weiß, Joseph

doi:10.1063/1.1740127

Cited by 124 publications

(64 citation statements)

References 8 publications

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“…This process generates ·OH through the reaction of H 2 O 2 and ferrous salt in acidic environment. The use of Fenton processes for treating various types of wastewater has also been studied (Bauer et al 1993, Perkowski et al 2000, Modenes et al 2012, Tony et al 2012, Borba et al 2013 , as depicted in Equation (8) (Rigg et al 1954, Walling 1975, Buxton et al 1988, Neyens and Baeyens 2003. The generation of the radicals involves a complex reaction sequence in an aqueous solution.…”

Section: Homogeneous Fenton Processmentioning

confidence: 99%

Recent advances and prospects of catalytic advanced oxidation process in treating textile effluents

Buthiyappan

Raman

Daud

2016

Reviews in Chemical Engineering

243

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AbstractIn the past few years, there have been many researches on the use of different types of homogenous catalyst for the degradation of textile wastewater in conventional advanced oxidation processes (AOPs). However, homogenous AOPs suffer from few limitations, including large consumption of chemicals, acidic pH, high cost of hydrogen peroxide, generation of iron sludge, and necessity of post-treatment. Therefore, recently, there have been more researches that focus on improving the performance of conventional AOPs using heterogeneous catalysts such as titanium dioxide, nanomaterials, metal oxides, zeolite, hematite, goethite, magnetite, and activated carbon (AC). Besides, different supports such as AC that have been incorporated with transition metals and clays have been proven to have excellent catalytic activity in AOPs. This paper presents a comprehensive review of advances and prospects of catalytic AOPs for the decontamination of a wide range of synthetic and real textile wastewater. This review provides an up-to-date critical review of the information on the degradation of various textile dyes by a wide range of heterogeneous catalysts and adsorbents. The future challenges of AOPs, including chemical consumption, toxicity assessment, reactor design, and limitation of catalysts, are discussed in this paper. In addition, this paper also discusses the presence of ions, generation of by-products, and industrial applications of AOPs. Special emphasis is given to recent studies and large-scale combination of AOPs for wastewater treatment. This review paper concludes that more studies are needed for the kinetics, reactor design, and modeling of hybrid AOPs and the production of their corresponding intermediate products and secondary pollutants. A better economic model should also be developed to predict the cost of AOPs, as the treatment cost varies with dyes and textile effluents.

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Section: Homogeneous Fenton Processmentioning

confidence: 99%

Recent advances and prospects of catalytic advanced oxidation process in treating textile effluents

Buthiyappan

Raman

Daud

2016

Reviews in Chemical Engineering

243

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“…RX + • OH → RX •+ + OH - (6) Além destas, outras reações radicalares também podem ocorrer (Equações 7 e 8), no entanto são indesejáveis do ponto de vista de oxidação dos compostos orgânicos, pois consomem radicais • OH, prejudicando a eficiência do processo de fotodegradação. …”

Section: Transferência Eletrônicaunclassified

Fundamentos e aplicações ambientais dos processos fenton e foto-fenton

Nogueira¹,

Trovó²,

Silva³

et al. 2007

Quím. Nova

235

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Recebido em 11/11/05; aceito em 25/5/06; publicado na web em 10/1/07 FUNDAMENTS AND ENVIRONMENTAL APPLICATIONS OF FENTON AND PHOTO-FENTON PROCESSES. Wastewater and soil treatment processes based on Fenton's reagent have gained great attention in recent years due to its high oxidation power. This review describes the fundaments of the Fenton and photo-Fenton processes and discusses the main aspects related to the degradation of organic contaminants in water such as the complexation of iron, the use of solar light as the source of irradiation and the most important reactor types used. An overview of the main applications of the process to a variety of industrial wastewater and soil remediations is presented.Keywords: advanced oxidation processes; photo-Fenton; degradation. INTRODUÇÃOO desenvolvimento de novos produtos químicos tem melhorado significativamente a qualidade de vida da população. A importân-cia de seu papel em muitos setores, como agricultura, indústria, transportes e saúde, é inquestionável. No entanto, tem contribuído drasticamente para a contaminação ambiental principalmente devido ao descarte inadequado de substâncias tóxicas como gases, metais pesados, compostos orgânicos entre outros.A maior conscientização dos riscos iminentes à saúde humana e a necessidade de conservação dos recursos naturais têm motivado esforços para minimizar o problema da contaminação. Alguns exemplos são a imposição de legislações mais restritivas, que visem a redução da quantidade e toxicidade das emissões, reciclagem e reuso de resíduos, adaptação e otimização de processos de produção e a substituição de matérias-primas tóxicas. Também é de suma importância a utilização de métodos de tratamento de efluentes e de recuperação de ambientes já contaminados, que satisfaçam as restrições impostas.Neste contexto, os Processos Oxidativos Avançados (POA) têm atraído grande interesse tanto da comunidade científica como industrial. São definidos como os processos baseados na formação de radical hidroxila ( · OH), altamente oxidante. Devido ao seu alto potencial padrão de redução 1 (Equação 1), este radical é capaz de oxidar uma ampla variedade de compostos orgânicos a CO 2 , H 2 O e íons inorgânicos provenientes de heteroátomos.• OH + e -+H + → H 2 O E o = 2,730 V (versus ENH)O radical hidroxila é geralmente formado em reações que resultam da combinação de oxidantes como ozônio e peróxido de hidrogênio com irradiação ultravioleta (UV) ou visível (Vis) e catalisadores, como íons metálicos ou semicondutores. Dependendo da estrutura do contaminante orgânico, podem ocorrer diferentes reações envolvendo o radical hidroxila, tais como abstração de áto-mo de hidrogênio, adição eletrofilica a substâncias contendo insaturações e anéis aromáticos, transferência eletrônica e reações radical-radical descritas a seguir 2 : Abstração de átomo de hidrogênioOs radicais hidroxila formados são capazes de oxidar compostos orgânicos por abstração de hidrogênio, gerando radicais orgâni-cos (Equação 2). Posteriormente ocorre adição de oxigênio molecula...

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“…(7)) has a higher kinetic rate with H 2 O 2 (1 Â 10 4 M À1 s À1 ) (Park et al, 1997) than the ferrous-aquo complex (50-80 M À1 s À1 ) (Barb et al, 1950;Rigg et al, 1954) (eq. (1)).…”

Section: Effect Of Organic Additivesmentioning

confidence: 99%

Selecting the best AOP for isoxazolyl penicillins degradation as a function of water characteristics: Effects of pH, chemical nature of additives and pollutant concentration

Villegas-Guzmán

Silva-Agredo

Flórez

et al. 2017

Journal of Environmental Management

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a b s t r a c tTo provide new insights toward the selection of the most suitable AOP for isoxazolyl penicillins elimination, the degradation of dicloxacillin, a isoxazolyl penicillin model, was studied using different advanced oxidation processes (AOPs): ultrasound (US), photo-Fenton (UV/H 2 O 2 /Fe 2þ ) and TiO 2 photocatalysis (UV/TiO 2 ). Although all processes achieved total removal of the antibiotic and antimicrobial activity, and increased the biodegradability level of the solutions, significant differences concerning the mineralization extend, the pH of the solution, the pollutant concentration and the chemical nature of additives were found. UV/TiO 2 reached almost complete mineralization; while~10% mineralization was obtained for UV/H 2 O 2 /Fe 2þ and practically zero for US. Effect of initial pH, mineral natural water and the presence of organic (glucose, 2-propanol and oxalic acid) were then investigated. UV/H 2 O 2 /Fe 2þ and US processes were improved in acidic media, while natural pH favored UV/TiO 2 system. According to both the nature of the added organic compound and the process, inhibition, no effect or enhancement of the degradation rate was observed. The degradation in natural mineral water showed contrasting results according to the antibiotic concentration: US process was enhanced at low concentration of dicloxacillin followed by detrimental effects at high substrate concentrations. A contrary effect was observed during photo-Fenton, while UV/TiO 2 was inhibited in all of cases. Finally, a schema illustrating the enhancement or inhibiting effects of water matrix is proposed as a tool for selecting the best process for isoxazolyl penicillins degradation.

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The Rate Constant of the Reaction between Hydrogen Peroxide and Ferrous Ions

Cited by 124 publications

References 8 publications

Recent advances and prospects of catalytic advanced oxidation process in treating textile effluents

Recent advances and prospects of catalytic advanced oxidation process in treating textile effluents

Fundamentos e aplicações ambientais dos processos fenton e foto-fenton

Selecting the best AOP for isoxazolyl penicillins degradation as a function of water characteristics: Effects of pH, chemical nature of additives and pollutant concentration

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