Adsorption of fluoride from aqueous solution by alumina of alkoxide nature: Batch and continuous operation

Kamble, Sanjay P.; Deshpande, Gunavant; Barve, Prashant P.; Rayalu, Sadhana; Labhsetwar, Nitin; Malyshew, Alexander; Kulkarni, Bhaskar D.

doi:10.1016/j.desal.2010.07.001

Cited by 66 publications

(38 citation statements)

References 16 publications

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“…Adsorption process among several treatment technologies is applied for removal of fluoride (F − ), arsenite (As(III)), and arsenate (As(V)) ions due to the availability of local material and being easy to operate and maintain and in general it is a low-cost technology and is suitable for use in developing countries. The adsorption process is influenced by several environmental conditions, such as pH, salt effect, or ionic strength, the presence of other anions, cations, and organic matter, and adsorbate physical and chemical properties which have been reported in previous studies [1][2][3][4][5]. However, no previous study was done to compare the two anions based on the influence factors such pH, salt effect, or ionic strength and the presence of other anions and their relationship on the adsorption isotherm.…”

Section: Introductionmentioning

confidence: 89%

“…One of the common interfering anions is phosphates. Phosphates exist in four different forms depending on the pH value, phosphate ion (PO 4 3− ), dihy- [72]. Ionic strength has been reported to increase with an increase in adsorption for arsenate [67] and it has no significant effect on the adsorption of fluoride [73].…”

Section: Adsorption Methods For Arsenic and Fluoride Removalmentioning

confidence: 99%

“…Different materials exist in water and wastewater, which have different absorption properties and may compete with each other for the limited amount of sites adsorption, and therefore the adsorption in the specific material is reduced [4,50,51]. These materials include anions and cations and organic matters [51][52][53][54][55].…”

Section: Adsorption Methods For Arsenic and Fluoride Removalmentioning

confidence: 99%

“…Experimental results showed that the pH solution is the main controlling parameter in the adsorption processes [27]. pH affects adsorption by affecting the surface charge on the adsorbent [4,24,28,29]. However, the evaluation of pH effects is governed by the specific interactions between the ions and the adsorption sites [30].…”

Section: Adsorption Methods For Arsenic and Fluoride Removalmentioning

confidence: 99%

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A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

John

David

Mmereki

2018

International Journal of Chemical Engineering

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This paper presents a comparative review of arsenite (As(III)), arsenate (As(V)), and fluoride (F − ) for a better understanding of the conditions and factors during their adsorption with focus on (i) the isotherm adsorption models, (ii) effects of pH, (iii) effects of ionic strength, and (iv) effects of coexisting substances such as anions, cations, and natural organics matter. It provides an indepth analysis of various methods of arsenite (As(III)), arsenate (As(V)), and fluoride (F − ) removal by adsorption and the anions' characteristics during the adsorption process. The surface area of the adsorbents does not contribute to the adsorption capacity of these anions but rather a combination of other physical and chemical properties. The adsorption capacity for the anions depends on the combination of all the factors: pH, ionic strength, coexisting substances, pore volume and particles size, surface modification, pretreatment of the adsorbents, and so forth. Extreme higher adsorption capacity can be obtained by the modification of the adsorbents. In general, pH has a greater influence on adsorption capacity at large, since it affects the ionic strength, coexisting anions such as bicarbonate, sulfate, and silica, the surface charges of the adsorbents, and the ionic species which can be present in the solution.

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Section: Introductionmentioning

confidence: 89%

Section: Adsorption Methods For Arsenic and Fluoride Removalmentioning

confidence: 99%

Section: Adsorption Methods For Arsenic and Fluoride Removalmentioning

confidence: 99%

Section: Adsorption Methods For Arsenic and Fluoride Removalmentioning

confidence: 99%

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A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

John

David

Mmereki

2018

International Journal of Chemical Engineering

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“…Contudo, este assunto tem causado intensa discussão, pois, conforme o Conselho Nacional de Pesquisa da Academia Nacional de Ciências dos Estados Unidos (NRC), os efeitos tóxicos do flúor, mesmo em concentrações consideradas seguras para o consumo humano, podem provocar danos significativos aos dentes e colocar os consumidores em risco elevado de dano ósseo, incluindo fratura óssea e dores nas articulações (NRC, 2006). A remoção do flúor não é um processo simples e diversos sistemas já foram sugeridos para este propósito, como, adsorção (BERGAMASCO, et al, 2014;KAMBLE et al, 2010) e resinas de troca iônica (CASTEL et al, 2000), além de sistemas de osmose reversa (SEHN, 2008), coagulação/floculação (SILVEIRA, et al, 2013), separação por membranas (BAZANELLA; BERGAMASCO, 2010) e nanopartículas de alumínio e carvão (KUMAR et al, 2010;ANSARI et al, 2011).…”

Section: Introductionunclassified

Avaliação Da Capacidade De Adsorção De Flúor Em Carvão Ativado De Origem Animal

Marin¹,

Novais²,

Sausen³

et al. 2015

Anais Do XXXVII Congresso Brasileiro De Sistemas Particulados

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RESUMONeste trabalho foi avaliado o potencial de adsorção do carvão ativado de osso bovino na remoção de íons fluoreto. Para tanto, inicialmente, determinou-se o ponto de carga zero do adsorvente (pH PCZ ). Em seguida, avaliou-se a cinética de adsorção, os efeitos do pH da solução (2 -12) e da temperatura do sistema (20, 30, 40 e 50°C) e, finalmente, o equilíbrio de adsorção. Todos os testes foram realizados em sistema fechado e batelada sob agitação constante (130 rpm). Os resultados obtidos mostram que o pH PCZ do adsorvente é igual a 6,63. A cinética de adsorção indica que o equilíbrio do sistema foi alcançado em, aproximadamente, 6 horas de operação. Os dois modelos cinéticos ajustados aos dados experimentais (pseudoprimeira e pseudossegunda ordens) descreveram de forma satisfatória a cinética de adsorção do flúor, com coeficiente de determinação superiores a 0,98. As avaliações dos efeitos do pH e temperatura apontam que as melhores condições de remoção de flúor foram obtidas em pH 2 e temperaturas de 40 e 50 °C para baixas concentrações e 30°C para concentrações acima de 4 mg L -1 . No estudo do equilíbrio, verificou-se que o modelo de Langmuir foi o que melhor se ajustou aos dados experimentais, apresentando capacidade máxima de adsorção de 2,03 mg g -1 em 30°C. Os resultados obtidos demonstraram que o adsorvente estudado apresenta grande potencial para a remoção de flúor, quando comparado a outros materiais adsorventes.

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Fluoride in Drinking Water: Health Effects and Remediation

Vithanage

Bhattacharya

2015

Environmental Chemistry for a Sustainable World

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Adsorption of fluoride from aqueous solution by alumina of alkoxide nature: Batch and continuous operation

Cited by 66 publications

References 16 publications

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

Avaliação Da Capacidade De Adsorção De Flúor Em Carvão Ativado De Origem Animal

Fluoride in Drinking Water: Health Effects and Remediation

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