Photocatalytic decomposition of organic micropollutants using immobilized TiO2 having different isoelectric points

Arlos, Maricor J.; Hatat-Fraile, Mélisa; Liang, Robert; Bragg, Leslie M.; Zhou, Norman Y.; Andrews, Susan A.; Servos, Mark R.

doi:10.1016/j.watres.2016.05.073

Cited by 73 publications

(59 citation statements)

References 45 publications

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“…Therefore, researchers have found that advanced oxidation processes (AOPs) can eliminate the refractory contaminants (including emerging contaminants and PPCPs) in aqueous environments, which deserves major attention [9][10][11][12][13][14]. Moreover, one of these technologies is solar photocatalysis (PC), which can degrade organic pollutants by means of the photocatalytic reaction promoted by the action of light on the surface of a semiconductor acting as a photocatalyst [15].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Performance and Degradation Mechanism of Aspirin by TiO2 through Response Surface Methodology

Wang

et al. 2018

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Abstract:In the present work, the photocatalytic performance of P25TiO 2 was investigated by means of the degradation of aspirin, while the reaction system was systematically optimized by central composite design (CCD) based on the response surface methodology (RSM). In addition, three variables of initial pH value, initial aspirin concentration and P25 concentration were selected to assess the dependence of degradation efficiencies of aspirin. Meanwhile, a predicted model of degradation efficiency was estimated and checked using analysis of variance (ANOVA). The results indicated that the PC removal of aspirin by P25 was significantly influenced by all these variables in descending order as follows: P25 concentration > initial aspirin concentration > initial pH value. Moreover, the parameters were optimized by the CCD method. Under the conditions of an initial pH value of 5, initial aspirin concentration of 10 mg/L and P25 concentration of 50 mg/L, the degradation efficiency of aspirin was 98.9%with 60 min of Xenon lamp irradiation. Besides, based on the liquid chromatography-mass spectrometry measurements, two main PC degradation pathways of aspirin by TiO 2 were deduced and the tentative degradation mechanism was also proposed.

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Section: Introductionmentioning

confidence: 99%

Photocatalytic Performance and Degradation Mechanism of Aspirin by TiO2 through Response Surface Methodology

Wang

et al. 2018

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“…[1][2][3][4][5][6] Os micropoluentes orgânicos chegam ao ambiente, principalmente, por meio dos lançamentos de efluentes domésticos nos corpos hídricos, através das estações de tratamento de esgoto. [2][3][4][5] Geralmente, os fármacos são absorvidos pelos organismos e sofrem as reações metabólicas, porém, uma quantidade significativa dessas substâncias originais e seus metabólitos são, com frequência, encontrados no esgoto doméstico, provenientes de excreções de urina, fezes ou esterco animal. Os fármacos são desenvolvidos para serem persistentes com o objetivo de manter suas propriedades químicas e alcançar o efeito terapêutico.…”

Section: Introductionunclassified

“…8 Diferentes estudos avaliaram as taxas de remoção de fármacos de efluentes quando empregados os processos convencionais das estações de tratamento de esgotos (ETE's), muitos fármacos de relevância são parcialmente removidos (remoção menor que 10%) podendo, ainda, ser levemente modificados, sendo liberados na forma hidrolisada ou conjugada. 2,3,9 Se considerarmos que, no Brasil, grande parte desse esgoto é lançado nos rios sem receber nenhuma forma de tratamento esse problema é agravado. Estudo recente sobre saneamento básico mostrou a deficiência no fornecimento desse serviço no país.…”

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Photocatalitic Degradation of Sinvastatin, Amoxicillin and Fluoxetin Using TiO2 Immobilized in Cellulose Acetate

2017

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Beads of cellulose acetate containing titanium dioxide (TiO 2 /AC) were synthesized containing 10% and 6% (m/m) of TiO 2 and Ti, respectively. The TiO 2 is in the anatase form and is homogeneously dispersed on the surface of the cellulose acetate. The synthesized beads were efficient in the degradation of the micropollutants: Amoxicillin (99.0% in 240 minutes), Fluoxetine (85% in 180 minutes) and Simvastatin (99.1% in 30 minutes) by heterogeneous photocatalysis. The results obtained in our studies are similar or better than those obtained in other studies reported in the literature.Keywords: Beads of cellulose acetate; heterogeneous photocatalysis; organic micropollutants; advanced oxidative processes. ResumoEsferas de acetato de celulose contendo dióxido de titânio (TiO 2 /AC) foram sintetizadas contendo 10% e 6% (m/m) de TiO 2 e Ti, respectivamente. O TiO 2 encontra-se na forma anatase e está disperso homogeneamente sobre a superfície do acetato de celulose. As esferas sintetizadas foram eficientes na degradação dos micropoluentes: Amoxicilina (99,0% em 240 minutos), Fluoxetina (85% em 180 minutos) e Sinvastatina (99,1% em 30 minutos), através de fotocatálise heterogênea. Os resultados obtidos em nossos estudos são similares ou melhores dos que os obtidos em outros trabalhos relatados na literatura.Palavras-chave: Esferas de acetato de celulose; fotocatálise heterogênea; micropoluentes orgânicos; processos oxidativos avançados.

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“…It is therefore necessary to take any action to reduce their concentrations in the environment through the implementation of effective methods of their removal from aqueous streams. Advanced oxidations process, which include also the process of heterogeneous photocatalysis gives an opportunity to obtain satisfactory effects of micropollutant decomposition [5]. The oxidation and reduction of compounds by means of highly reactive free hydroxyl radicals OH • formed during the process depends on different operating parameters of the process, which include the wavelength emitted by the applied UV irradiation source [6], oxygen concentration in the irradiated water solution [7], catalyst dose and type [8] and also the physicochemical composition of the treated water [9,10].…”

Section: Introductionmentioning

confidence: 99%

The role of pH in the decomposition of organic micropollutants during the heterogeneous photocatalysis process

et al. 2017

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Abstract. The study investigated that the change in the pH ranged from 5 to 7 affects the adsorption degree of selected organic micropollutants such as: polycyclic aromatic hydrocarbons (anthracene, benzo[a]pyrene), pharmaceutical compounds (diclofenac) and industrial additives (octylphenol and pentachlorophenol) on the photocatalyst surface (100 mg TiO 2 /dm 3 ). For example, in suspension of pH 5 a 12% reduction in the concentration of octylphenol was noted, while in the suspension of pH 7 the concentration of this compound was reduced by 64%. In the case of anthracene an inverse relationship was observed. The concentration of this micropollutant decreased by 94% for pH 5 and only by 61% for pH 7 suspension. With the commencement of UV irradiation of reaction mixtures a gradual increase in the concentration of micropollutants reduction in aqueous solutions was observed. This indicates the decomposition of compounds as a result of their reaction with highly reactive OH • radicals or other reactive oxygen species generated during the process. For reaction mixtures of pH 7, already in the first 15 minutes, higher degrees of removal of micropollutants ware observed compared to suspension of pH 6. The obtained micropollutants removal degrees exceeded 91% for diclofenac, octylphenol, pentachlorophenol and amounted to 100% for anthracene and benzo(a)pyrene.

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Photocatalytic decomposition of organic micropollutants using immobilized TiO2 having different isoelectric points

Cited by 73 publications

References 45 publications

Photocatalytic Performance and Degradation Mechanism of Aspirin by TiO2 through Response Surface Methodology

Photocatalytic Performance and Degradation Mechanism of Aspirin by TiO2 through Response Surface Methodology

Photocatalitic Degradation of Sinvastatin, Amoxicillin and Fluoxetin Using TiO2 Immobilized in Cellulose Acetate

The role of pH in the decomposition of organic micropollutants during the heterogeneous photocatalysis process

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