Electrolytic and electro-irradiated processes with diamond anodes for the oxidation of persistent pollutants and disinfection of urban treated wastewater

Cotillas, Salvador; Vidales, María J. Martín de; Llanos, Javier; Sáez, Cristina; Cañizares, Pablo; Rodrigo, Manuel A.

doi:10.1016/j.jhazmat.2016.01.050

Cited by 95 publications

(71 citation statements)

References 61 publications

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“…The linear relationship in the inset of Figure indicates that data can be fitted to a pseudo‐first order kinetic. The kinetic constant of each process obtained in Table can be used to calculate the synergy coefficients (%), which is used to evaluate the effect of the combination of different single processes . In this study, the synergy coefficient can be calculated according to Eq.…”

Section: Resultsmentioning

confidence: 99%

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Degradation of Atenolol with Electrochemical Oxidation at Mixed Metal Oxide Electrodes Assisted by UV Photolysis

Zhu

Dong

Zhou

2018

CLEAN Soil Air Water

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Electrochemical oxidation has drawn considerable research attention for the destruction of organic contaminants. This study utilizes the combination of electrolysis and the UV photolysis process to degrade the β‐blocker atenolol (ATL). The results show that the combination of electrolysis and UV photolysis is superior to a single process alone based on the removal rates of ATL and electrical efficiency per order (EE/O). In situ electrogenerated chlorine is confirmed to be responsible for ATL degradation with NaCl electrolytes, and mixed metal oxide (MMO) anodes play a more significant role in the generation of active chlorine than platinum (Pt) anodes. Moreover, reactive species (hydroxyl radical •OH and chlorine radical •Cl) mainly contributed to ATL degradation during the photo‐electrolysis process. Increasing the concentration of NaCl electrolytes and applied current densities can enhance the ATL degradation. Finally, major intermediate products are identified, and a possible degradation pathway of ATL is proposed during the photo‐electrolysis processes. This study demonstrate that the photo‐electrolysis process can be considered as a potential technology for the destruction of pharmaceutical pollutants in water.

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Section: Resultsmentioning

confidence: 99%

“…Many common oxidants can be generated in the electrolysis processes under the presence of insert electrolyte, such as H 2 O 2 , Cl 2 , S 2 O 8 2− , or even O 3 . Chloride ions are commonly present in drinking water or environmental water, and thus active chlorine can be produced in the presence of chloride (see Eqs.…”

Section: Resultsmentioning

confidence: 99%

Degradation of Atenolol with Electrochemical Oxidation at Mixed Metal Oxide Electrodes Assisted by UV Photolysis

Zhu

Dong

Zhou

2018

CLEAN Soil Air Water

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“…Thus necessary steps should be taken to remove and minimize the production of chlorate ion in the water treatment disinfection processes . Recently, attempts have been made by thermal desorption based ionizers, ultraviolet radiation to detect and decompose the chlorate formed in drinking water …”

Section: Discussionmentioning

confidence: 99%

“…47 Recently, attempts have been made by thermal desorption based ionizers, ultraviolet radiation to detect and decompose the chlorate formed in drinking water. [48][49][50] There are no reports on the effect of NaClO 3 on small intestine. Therefore, in the present work the effect of an acute oral dose of The extent of decline was more in BBMV than in homogenates.…”

Section: Discussionmentioning

confidence: 99%

Sodium chlorate, a major water disinfection byproduct, alters brush border membrane enzymes, carbohydrate metabolism and impairs antioxidant system of Wistar rat intestine

Ali

Ansari

Khan

et al. 2017

Environmental Toxicology

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Sodium chlorate (NaClO ) is a widely used nonselective herbicide. It is also generated as a by-product during disinfection of drinking water by chlorine dioxide. The purpose of this study was to evaluate the effect of NaClO on rat intestine. Adult male rats were randomly divided into five groups: control and remaining four groups were administered orally different doses of NaClO and sacrificed 24 h after the treatment. The administration of NaClO produced acute oxidative stress in the intestine, which manifested in the form of markedly enhanced malondialdehyde levels and carbonyl content and lowered total sulfhydryl groups and glutathione levels. The activities of several brush border membrane (BBM) enzymes were greatly reduced as compared to control. There were alterations in the activities of various enzymes of carbohydrate metabolism and those involved in maintaining the antioxidant defense system. Histological studies support the biochemical results showing NaClO dose-dependent increase in tissue damage. Thus, the present study shows that oral administration of NaClO decreases the activities of BBM enzymes, induces oxidative stress, alters metabolic pathways, and impairs the antioxidant system of rat intestine. © 2016 Wiley Periodicals, Inc. Environ Toxicol 32: 1607-1616, 2017.

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“…Entretanto, este sal também apresenta a problemática de poder haver a formação de hipoclorito, clorato e perclorato quando o potencial do ânodo estiver suficientemente alto, sendo que a ocorrência destas espécies nem sempre é considerada positiva e frequentemente deve ser evitada. 24 Attour e colaboradores 2 , obtendo-se como resposta uma concentração de 4,0 mg L -1 de fósforo. Obteve-se assim uma redução de 92%, superior aos 75% exigidos pela legislação.…”

Section: Otimizaçãounclassified

Application of Chemometrics for the Optimization of Phosphorus Removal Process by Electrocoagulation

et al. 2017

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Abstract:The wastewater treatment is an issue that has been studied in recent years due to the great degenerative potential of the environment. The availability of nutrients, particularly phosphorus, cause eutrophication of rivers and lakes. The electrocoagulation is a simple application technique for removing pollutants. Here, Design of Experiments (DoE) was applied for the optimization of the efficiency of the phosphorus removal process by electrocoagulation using a simple synthetic medium. Based on a fractional factorial design and literature data, potential applied, electrolysis time and electrolyte's initial conductivity were identified as significant variables. Box-Behnken Design (BBD) and Response Surface Method (RSM) were then used for optimization. The amplitude of the experimental domain in this study was limited by the equipment used (maximum of 25 V). Even so, the maximum phosphorus removal of 97.1% was estimated at potential of 25 V applied for 12.5 min using an initial conductivity of 1.1 mS cm -1 . The validation of the model was carried out and presented a reduction of 92% for phosphorus removal, obtaining a response only 5.1% below the expected, which proves the multivariate model's reliability. Keywords:Design of experiments; wastewater treatment; electrocoagulation. ResumoO tratamento de águas residuais é uma questão que tem sido estudada nos últimos anos devido ao grande potencial degenerativo do meio ambiente. A disponibilidade de nutrientes, em especial o fósforo, causa a eutrofização de rios e lagos. A eletrocoagulação é uma técnica de simples aplicação para a remoção de poluentes. O planejamento experimental multivariado foi utilizado para a otimização da eficiência do processo de remoção de fósforo por eletrocoagulação utilizando um meio sintético simples. Com base em um planejamento fatorial fracionário e dados da literatura, o potencial aplicado, o tempo de eletrólise e a condutividade inicial do eletrólito foram identificados como variáveis significativas. O planejamento BoxBehnken e a Metodologia de Superfície de Resposta foram então utilizados para a otimização. A amplitude do domínio experimental neste estudo foi limitada pelo equipamento utilizado (máximo de 25 V). Mesmo assim, uma remoção máxima de fósforo de 97,1% foi estimada em potencial de 25 V aplicado por 12,5 min usando uma condutividade inicial de 1,1 mS cm -2 . A validação do modelo foi realizada e apresentou uma redução de 92% para a remoção de fósforo, obtendo uma resposta apenas 5,1% abaixo do esperado, o que comprova a confiabilidade do modelo multivariado. Palavras

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Electrolytic and electro-irradiated processes with diamond anodes for the oxidation of persistent pollutants and disinfection of urban treated wastewater

Cited by 95 publications

References 61 publications

Degradation of Atenolol with Electrochemical Oxidation at Mixed Metal Oxide Electrodes Assisted by UV Photolysis

Degradation of Atenolol with Electrochemical Oxidation at Mixed Metal Oxide Electrodes Assisted by UV Photolysis

Sodium chlorate, a major water disinfection byproduct, alters brush border membrane enzymes, carbohydrate metabolism and impairs antioxidant system of Wistar rat intestine

Application of Chemometrics for the Optimization of Phosphorus Removal Process by Electrocoagulation

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