Photodegradation of Rhodamine 6G and phenol red by nanosized TiO2 under solar irradiation

Asiri, Abdullah M.; Al-Amoudi, Muhammed S.; Altalhi, Tariq; Altalhi, Abdullah D.

doi:10.1016/j.jscs.2010.06.005

Cited by 88 publications

(44 citation statements)

References 16 publications

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“…These ions can increase the photocatalytic activity of titanium dioxide at pH of 3.0 by acting as electron acceptors and preventing the occurrence of an electron-hole recombination process [2]. The other reason can be the probable occurrence of a Fenton-like process, which could lead to the free hydroxyl radicals formation [4,9]. These additional oxidant species can increase the photodegradation rate of the phenol.…”

Section: Characterizationmentioning

confidence: 99%

“…Elimination of phenolic compounds in wastewaters has been widely studied by different processes such as biological treatments, photocatalysis, adsorption, electrochemical oxidation, and Photo-Fenton oxidation [1][2][3][4]. Despite their effectiveness, many of them present disadvantages like transfer of pollutants, long degradation times and loss of valuable materials (catalysts) [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Titanium dioxide nanoparticles represent a promising alternative regarding contaminated wastewater treatment, thanks to their excellent photocatalytic activity and large surface area [3][4][5]. However, the separation of the nanoparticles from the aqueous solution once the process has finished represents a major drawback for their application.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the photocatalytic activity of iron oxide nanoparticles functionalized with titanium dioxide

Herrera

Reyes

Colina–Márquez

2016

J. Phys.: Conf. Ser.

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Abstract. Photocatalytic activity of iron oxide (IO) nanoparticles functionalized with TiO 2 was evaluated through photodegradation of phenol under UV irradiation. For this, magnetic nanoparticles were synthesized by co-precipitation method obtaining aggregates with a size of 46nm. The IO nanoparticles were encapsulated in a polysiloxane matrix and then functionalized with TiO 2 at 25°C (sample A: 0.1g TiO 2 and B: 0.3g TiO 2 ). Photodegradation experiments were carried out for six hours at pH 3.0 using concentrations of IO-TiO 2 nanoparticles of 0.2, 0.5, and 1.0g/L. A maximum amount of 89% of phenol photodegradation was achieved by using 0.2g/L of the IO-TiO 2 -B sample. In addition, it was evaluated the possibility to re-using the nanomaterial after magnetic separation. For this, 0.2g/L of B sample were submitted for five cycles of photodegradation. A stable photocatalytic activity was observed as well as the nanoparticles were regenerated by calcination among cycles, which suggests the versatility of these nanoparticles for the photodegradation of organic pollutants.

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Section: Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of the photocatalytic activity of iron oxide nanoparticles functionalized with titanium dioxide

Herrera

Reyes

Colina–Márquez

2016

J. Phys.: Conf. Ser.

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“…5 Nestes estudos, a rápida degradação de corantes em solução aquosa tem sido demonstrada, principalmente utilizando--se fotocatalisador em suspensão. [6][7][8][9] Mesmo apresentando elevada eficiência de degradação, poucos trabalhos relatam o uso do processo fotocatalítico em grande escala, basicamente em função de inconvenientes representados pela necessidade de fontes artificiais de radiação e de agentes sequestrantes de elétrons, bem como pela dificuldade de remoção do semicondutor, devido ao pequeno tamanho das partículas. 10 Visando a minimização destes inconvenientes, novas alternativas vêm sendo propostas, com destaque para o uso de processos fotoeletroquímicos, os quais têm-se mostrado eficazes na degradação de poluentes orgânicos persistentes, em tempos de reação relativamente baixos.…”

Section: Introductionunclassified

“…[6][7][8][9] Mesmo apresentando elevada eficiência de degradação, poucos trabalhos relatam o uso do processo fotocatalítico em grande escala, basicamente em função de inconvenientes representados pela necessidade de fontes artificiais de radiação e de agentes sequestrantes de elétrons, bem como pela dificuldade de remoção do semicondutor, devido ao pequeno tamanho das partículas.…”

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Degradação fotoeletroquímica do corante azul QR 19 em solução aquosa

Jacobs¹,

Peralta‐Zamora²

2012

Quím. Nova

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Recebido em 20/5/11; aceito em 24/11/11; publicado na web em 23/1/12 PHOTOELECTROCHEMICAL DEGRADATION OF REACTIVE BLUE 19 IN AQUEOUS SOLUTIONS. In this work the degradation capacity of a photo-electrocatalytic system was evaluated, mainly regarding the effect of the electrolyte solution on the degradation capacity toward a reactive textile dye. In the presence of NaCl the photo-electrochemical process shows high degradation efficiency, permitting almost total color removal in treatment of about 5 min. In view of the low degradation efficiency observed for the photocatalytic process it is possible to assume that the high degradation efficiency of the process is a function of electrochemical generation of oxidant active chlorine species, which are subsequently transformed to higher oxidant radical forms.Keywords: photo-electrocatalysis; dyes; electrolytes. INTRODUÇÃOO crescimento populacional e industrial que caracteriza as úl-timas décadas tem propiciado um significativo aumento na geração de resíduos urbanos e industriais, os quais, tratados ou dispostos de maneira inadequada, propiciam o surgimento de efeitos deletérios em diversos compartimentos ambientais.Dentro do contexto da poluição de origem industrial, deve ser dado destaque aos processos de beneficiamento têxtil, particularmente aos processos de tingimento, os quais são responsáveis pela geração de grandes volumes de resíduos, contendo elevada carga orgânica e forte coloração.1 De maneira geral, estima-se que 1 a 15% da carga de corantes pode ser perdida durante operações de tingimento e lavagem, 2 o que dificulta o tratamento e praticamente inviabiliza o reuso das águas residuárias. 3No meio industrial, o tratamento deste tipo de resíduos é realizados por rotinas convencionais, normalmente envolvendo processos de coagulação, adsorção e tratamento biológico, técnicas estas que apresentam inconvenientes derivados da elevada produção de lodos, do caráter não destrutivo e da usual resistência dos corantes frente a processos de natureza biológica, respectivamente. 4 Em função das desvantagens associadas ao uso de processos convencionais de tratamento, a potencialidade dos processos oxidativos avançados tem sido investigada desde 1996, principalmente utilizando-se processos de fotocatálise heterogênea mediados por dióxido de titânio.5 Nestes estudos, a rápida degradação de corantes em solução aquosa tem sido demonstrada, principalmente utilizando--se fotocatalisador em suspensão. [6][7][8][9] Mesmo apresentando elevada eficiência de degradação, poucos trabalhos relatam o uso do processo fotocatalítico em grande escala, basicamente em função de inconvenientes representados pela necessidade de fontes artificiais de radiação e de agentes sequestrantes de elétrons, bem como pela dificuldade de remoção do semicondutor, devido ao pequeno tamanho das partículas.10 Visando a minimização destes inconvenientes, novas alternativas vêm sendo propostas, com destaque para o uso de processos fotoeletroquímicos, os quais têm-se mostrado eficazes na degradação de poluentes o...

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Luminescent Pentacene‐Loaded Carbon Nanodots with Red‐Light Triggered Photothermal and Photosensitizing Properties

Forte,

Consoli,

Ferreri

et al. 2024

ChemPhotoChem

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The development of multifunctional nanosystems for photo‐induced hyperthermia and photodynamic effect is a challenging topic in the research of advanced materials for application in biomedical field. Here, we report red‐luminescent carbon‐nanodots (CDs‐PNM/PTC) derived from entrapment of pentacene (PTC) in nanodots prepared from poly(N‐isopropylacrylamide) polymer (CDs‐PNM) by an easy and reagent‐free method. The CD‐PNM/PTC nanosystem was characterized by different techniques (UV‐Vis spectrophotometry, fluorescence, NMR, AFM). Molecular modelling investigations were performed to unveil stability, structures and energy of the CD‐PNM/PTC supramolecular adducts at 298 K and 315 K. The nanosized CDs–PNM/PTC exhibited excellent water‐dispersibility, good photothermal conversion efficiency and photosensitizing effect at 680 nm. No significant toxicity and eukaryotic cell uptake are features that open to potential applications in photothermal‐photodynamic treatments.

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Photodegradation of Rhodamine 6G and phenol red by nanosized TiO2 under solar irradiation

Cited by 88 publications

References 16 publications

Evaluation of the photocatalytic activity of iron oxide nanoparticles functionalized with titanium dioxide

Evaluation of the photocatalytic activity of iron oxide nanoparticles functionalized with titanium dioxide

Degradação fotoeletroquímica do corante azul QR 19 em solução aquosa

Luminescent Pentacene‐Loaded Carbon Nanodots with Red‐Light Triggered Photothermal and Photosensitizing Properties

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