Fotocatálise heterogênea com TiO2 para oxidação de arsênio e sua remoção de águas por coprecipitação com sulfato férrico

Mendes, Gisele; Bellato, Carlos Roberto; Neto, José de Oliveira Marques

doi:10.1590/s0100-40422009000600021

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…The concentration of As(V) was determined as the difference between total arsenic and As(III). 27 All analyses were carried out in duplicate.…”

Section: Determination Of Arsenicmentioning

confidence: 99%

“…The water samples were collected and physico-chemically characterized by in situ analyses for pH, E h , temperature, electrical conductivity, salinity and dissolved oxygen, according to the procedure described by Mendes et al. 27 To the water samples, 1 mg L -1 of As(III) and As(V) was added. This addition was necessary to evaluate the efficiency of the adsorption process for removal of As(III) and As(V) in natural matrices, and in regions of the Quadrilátero Ferrífero, groundwater concentrations exceeding 1 mg L -1 were already observed.…”

Section: Applicability Of the Adsorbent To Water Naturally Contaminatmentioning

confidence: 99%

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Preparation and evaluation of chitosan beads immobilized with Iron(III) for the removal of As(III) and As(V) from water

Neto¹,

Bellato²,

Milagres³

et al. 2013

J. Braz. Chem. Soc.

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O adsorvente quitosana-Fe(III)-reticulado (Ch-FeCL) foi desenvolvido usando Fe(III) imobilizado em esferas de quitosana. Após o processo de secagem, as esferas apresentam um diâmetro de cerca de 1 mm e são estáveis ao ar. O comportamento de adsorção do As(III) e As(V) na Ch-FeCL foi avaliado em pH 7 por estudos realizados em batelada e em coluna. As máximas capacidades de adsorção estimadas pelo modelo de adsorção de Langmuir foram 21,24 e 27,59 mg g -1 para As(III) e As(V), respectivamente. A cinética de adsorção é descrita pela equação cinética de pseudo-segunda ordem. Os resultados de adsorção em coluna indicaram que o arsênio não foi encontrado na solução efluente até cerca de 60 e 759 volumes de leito para As(III) e As(V), respectivamente. Os resultados foram satisfatórios quando se empregou o adsorvente na remoção de As(III) e As(V) de amostras de águas subterrâneas, torneira e rio.The crosslinked chitosan-Fe(III) (Ch-FeCL) adsorbent was developed using Fe(III) immobilized on chitosan beads. After drying, the beads presented a diameter of approximately 1 mm and are stable in air. The adsorption behavior of As(III) and As(V) on the Ch-FeCL was evaluated at pH 7 by studies conducted in batch and in columns. Maximum adsorption capacities estimated by the Langmuir adsorption model were 21.24 and 27.59 mg g -1 for As(III) and As(V), respectively. Adsorption kinetics is described by the pseudo second order kinetic equation. The results of column adsorption indicated that arsenic was not found in the effluent solution from roughly 60 and 759 bed volumes for As(III) and As(V), respectively. Results were satisfactory when employing the adsorbent for removal of As(III) and As(V) from groundwater, tap water and river water samples.

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“…The concentration of As(V) was determined as the difference between total arsenic and As(III). 27 All analyses were carried out in duplicate.…”

Section: Determination Of Arsenicmentioning

confidence: 99%

Section: Applicability Of the Adsorbent To Water Naturally Contaminatmentioning

confidence: 99%

Preparation and evaluation of chitosan beads immobilized with Iron(III) for the removal of As(III) and As(V) from water

Neto¹,

Bellato²,

Milagres³

et al. 2013

J. Braz. Chem. Soc.

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“…Esse par elétron-lacuna pode desencadear reações redox que levam à formação de espécies radicalares, principalmente o radical hidroxila (•OH), com alto poder de oxidação, que através de um Processo de Oxidação Avançado (POA), mineraliza os poluentes orgânicos, produzindo principalmente espécies inócuas, como CO2 e H2O [3,4].…”

Section: Introductionunclassified

Membranas de Borracha natural crua utilizados como suporte para partículas de Dióxido de Titânio: Síntese, Caracterização e Avaliação térmica por TG-DTG e DSC

Stropa¹,

Herrero²,

Santos³

et al. 2016

Braz. J. Therm. Anal.

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No presente trabalho catalisadores de TiO2 foram preparados pelo método solgel e incorporados em membranas de borracha natural nas quantidades de 0, 5, 10 e 15% (massa/massa). Os materiais obtidos foram caracterizados por difratometria de raios-X (DRX), microscopia eletrônica de varredura (MEV), termogravimetria (TG-DTG) e calorimetria exploratória diferencial (DSC). A partir das técnicas utilizadas foi possível avaliar que o material cerâmico se apresenta na fase anatase e não influencia na estabilidade térmica da borracha, que permanece com temperatura T0 próxima a 300 °C. A temperatura de transição vítrea da borracha também não é alterada pelo TiO2, permanecendo próxima a-63 °C. As características físicas e químicas bem como a morfologia das membranas obtidas, evidenciam que a borracha natural crua se mostra interessante para tal aplicação.

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Purification of arsenic-contaminated water with K-jarosite filters

Hott

Maia

Santos

et al. 2018

Environ Sci Pollut Res

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The high toxicity and potential arsenic accumulation in several environments have encouraged the development of technologies for its removal from contaminated waters. However, the arsenic released into aquatic environment comes mainly from extremely acidic mining effluents, making harder to find stable adsorbents to be used in these conditions. In this work, K-jarosite particles were synthesized as a stable adsorbent in acidic medium for eliminating arsenic from contaminated water. The adsorption capacities of K-jarosite for As, As, and monomethylarsonic acid were 9.45, 12.36, and 8.21 mg g, respectively. Most arsenic in water was adsorbed within the first 10 min, suggesting the fast arsenic adsorption kinetics of K-jarosite particles. Because of that, a K-jarosite filter was constructed for purifying water at a constant flow. The K-jarosite filter was highly efficient to treat arsenic-contaminated water from a Brazilian river, reducing the concentration of arsenic in water to near zero. These data suggest the K-jarosite filter can be used as a low-cost technology for purifying arsenic-contaminated water in acidic medium.

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Fotocatálise heterogênea com TiO2 para oxidação de arsênio e sua remoção de águas por coprecipitação com sulfato férrico

Cited by 5 publications

References 20 publications

Preparation and evaluation of chitosan beads immobilized with Iron(III) for the removal of As(III) and As(V) from water

Preparation and evaluation of chitosan beads immobilized with Iron(III) for the removal of As(III) and As(V) from water

Membranas de Borracha natural crua utilizados como suporte para partículas de Dióxido de Titânio: Síntese, Caracterização e Avaliação térmica por TG-DTG e DSC

Purification of arsenic-contaminated water with K-jarosite filters

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