Adsorption technique for the treatment of As(V)-rich effluents

Singh, Dupinder; Prasad, G.; Rupainwar, D. C.

doi:10.1016/0927-7757(95)03468-4

Cited by 154 publications

(85 citation statements)

References 8 publications

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“…Hence, the correlation coefficient for Langmuir isotherm is higher (r 2 =0.984). Therefore it is assumed that limited adsorption St (mg/g) St (mg/g) capacity of the adsorbent up to S max (9.86 mg/g), which is comparable with other related studies using ferric modified organic adsorbents or inorganic reagents (Lorenzen et al, 1995;Singh et al, 1996). However, the adsorption capacity is lower when compared to biomass modified with cationic polyelectrolyte (Loukidou et al, 2003).…”

Section: Adsorption Isothermsmentioning

confidence: 48%

Removal of arsenic (V) from aqueous solutions using chemically modified sawdust of spruce (Picea abies): Kinetics and isotherm studies

Urík

Littera

Ševc

et al. 2009

Int. J. Environ. Sci. Technol.

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ABSTRACT:Arsenic is a ubiquitous element in the environment and occurs naturally in both organic and inorganic forms. Under aerobic condition, the dominant form of arsenic in waters is arsenate, which is highly mobile and toxic. Arsenic poisoning from drinking water remains a serious world health issue. There are various standard methods for arsenic removal from drinking waters (coagulation, sorption, ion-exchange reactions or methods of reverse osmosis) and alternative methods, such as biosorption. Biosorption of arsenic from natural and model waters by native or chemically modified (with urea or ferric oxyhydroxides) plant biomass prepared from sawdust of Picea abies was studied. The kinetic of the adsorption process fitted well the pseudo second order adsorption model and equilibrium was achieved after 2 h. The results showed that biosorption was well described by both Langmuir and Freundlich isotherms. The maximum biosorption capacity of the sawdust modified with ferric oxyhydroxides, evaluated by Langmuir adsorption model, was 9.259 mg/g, while the biosorption capacity of unmodified biosorbent or biosorbent modified with urea was negligible. The adsorption capacity is comparable to results published by other authors, suggesting that the prepared chemically modified biosorbent has potential in remediation of contaminated waters.

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Section: Adsorption Isothermsmentioning

confidence: 48%

Removal of arsenic (V) from aqueous solutions using chemically modified sawdust of spruce (Picea abies): Kinetics and isotherm studies

Urík

Littera

Ševc

et al. 2009

Int. J. Environ. Sci. Technol.

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“…A quantificação do teor de As em todas as análises foi realizada por espectrofotometria de absorção atômica, usando equipamento Perkin Elmer Aanalyst 800, com atomização eletrotérmica em forno de grafite. As condições de leitura utilizadas foram temperatura de pirólise de 500 °C (recomendação do fabricante) e 0,003 mg de Mg na forma de Mg(NO 3 ) 2 como modificador químico (Niedzielski et al, 2002 isotermas de Langmuir, sendo estas as mais utilizadas no estudo de adsorção de As (Singh et al, 1996;Namasivayam & Senthilkumar, 1998;Ladeira et al, 2002). A equação da isoterma de Langmuir,…”

Section: Methodsunclassified

“…A adsorção de As(V) em diferentes adsorventes tem sido avaliada por isotermas de Freundlich e Langmuir e normalmente segue o modelo de cinética de primeira ordem, com constantes cinéticas de adsorção variáveis (0,01 a 0,14 min -1 ) em função de temperatura, tipo de adsorvente e tamanho de partícula (Singh et al, 1996;Namasivayam & Senthilkumar, 1998).…”

Section: Introductionunclassified

Teor e capacidade máxima de adsorção de arsênio em Latossolos brasileiros

Campos

Guilherme

Lopes³

et al. 2007

Rev. Bras. Ciênc. Solo

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SUMMARY: CONTENT AND MAXIMUM CAPACITY OF ARSENIC ADSORPTION IN BRAZILIAN OXISOLSIn view of the toxicity of As for man and animals and the possibility of existence of a great number of contaminated areas it is imperative to know the total As content in soils considered uncontaminated and about As sorption processes in soils of variable charge. The objective of this work was to determine the total content and maximum capacity of As

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“…The lowest residual As(V) concentration was found around pH 8.1 which was the pH zpc of FMBO-diatomite. Singh et al [28] observed that specific adsorption caused an increase of adsorption capacity for As(V) on hematite and feldspar at pH zpc . In this study, the adsorption efficiency was almost equal to the oxidation efficiency when the pH was raised to pH zpc .…”

Section: Effect Of Ph On As(iii) Adsorptionmentioning

confidence: 99%

Fe–Mn binary oxide incorporated into diatomite as an adsorbent for arsenite removal: Preparation and evaluation

Chang

Liu

et al. 2009

Journal of Colloid and Interface Science

104

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a b s t r a c tFe-Mn binary oxide incorporated into diatomite (FMBO-diatomite) was prepared by a simple coating method, and exhibited high oxidation and adsorption ability for arsenite [As(III)]. After being incorporated by Fe-Mn binary oxide, the surface area of diatomite increased 36%, and the pore volume increased five times. The pH zpc of FMBO-diatomite was determined to be 8.1. These characteristics are responsible for the increased As(III) adsorption efficiency. The adsorption equilibria of As(III) on FMBO-diatomite were described well by a Langmuir isotherm model due to the homogeneous distribution of Fe-Mn binary oxide on a diatomite surface. As(III) was oxidized into As(V), and then adsorbed by FMBO-diatomite. The oxidation and adsorption efficiencies for As(III) depended deeply on the pH of solution. When the pH was raised to 8.1, the As(III) adsorption efficiency of FMBO-diatomite was almost equal to the As(III) oxidation efficiency. Silicate and phosphate had negative effects on As(III) adsorption. Also the influence of silicate and phosphate with the pH variation was different.

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Adsorption technique for the treatment of As(V)-rich effluents

Cited by 154 publications

References 8 publications

Removal of arsenic (V) from aqueous solutions using chemically modified sawdust of spruce (Picea abies): Kinetics and isotherm studies

Removal of arsenic (V) from aqueous solutions using chemically modified sawdust of spruce (Picea abies): Kinetics and isotherm studies

Teor e capacidade máxima de adsorção de arsênio em Latossolos brasileiros

Fe–Mn binary oxide incorporated into diatomite as an adsorbent for arsenite removal: Preparation and evaluation

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