Arsenic (III) adsorption on iron acetate coated activated alumina: thermodynamic, kinetics and equilibrium approach

Das, Bhanita; Devi, Rajlakshmi; Umlong, Iohborlang M.; Borah, Kusum; Banerjee, Sumanta; Talukdar, Anjumani

doi:10.1186/2052-336x-11-42

Cited by 14 publications

(4 citation statements)

References 28 publications

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“…According to the Langmuir isotherm the adsorption capacity of the modified zeolite was 0.315 mg g −1 . This value is higher than those reported by different low cost adsorbents modified with iron [69][70][71][72]. The adsorption coefficient (b) increased when increasing the temperature.…”

Section: Adsorption Isotherms and Thermodynamic Parameterscontrasting

confidence: 53%

Adsorption of Aqueous As (III) in Presence of Coexisting Ions by a Green Fe-Modified W Zeolite

Medina-Ramírez

Gamero‐Melo²,

Ruiz-Camacho

et al. 2019

Water

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The high toxicity of arsenite and the difficulty to remove it is one of the main challenges for water treatment. In the present work the surface of a low cost zeolite was modified by chemical treatment with a ferrous chloride to enhance its arsenite adsorption capacity. The effect of pH, ions coexistence, concentration, temperature and dosage was studied on the adsorption process. Additionally, the Fe-modified W zeolite was aged by an accelerated procedure and the regeneration of the exhausted zeolite was demonstrated. The Fe-modified W zeolite was stable in the pH range of 3 to 8 and no detriment to its arsenite removal capacity was observed in the presence of coexisting ions commonly found in underground water. The studies showed that the adsorption of As (III) on Fe-modified W zeolite is a feasible, spontaneous and endothermic process and it takes place by chemical bonding. The exhausting process proved the adsorption of 0.20 mg g−1 of As (III) by the Fe-modified W zeolite and this withstand at least five aging cycles without significant changes of its arsenite adsorption capacity. Fe-modified W zeolite prepared from fly ash might be a green and low-cost alternative for removal of As (III) from groundwater.

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Section: Adsorption Isotherms and Thermodynamic Parameterscontrasting

confidence: 53%

Adsorption of Aqueous As (III) in Presence of Coexisting Ions by a Green Fe-Modified W Zeolite

Medina-Ramírez

Gamero‐Melo²,

Ruiz-Camacho

et al. 2019

Water

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show abstract

“…The negative ∆G and positive ∆S values confirm the feasibility and spontaneity of the sorption process. Furthermore, the positive ∆S value showed increasing randomness during the sorption of As(III) on Fe-UTAC and also reflected the randomness at the solid/liquid interface during arsenite adsorption onto Fe-UTAC [54].…”

Section: 7mentioning

confidence: 90%

ADSORPTION OF As(III) FROM AQUEOUS SOLUTION ONTO IRON IMPREGNATED USED TEA ACTIVATED CARBON: EQUILIBRIUM, KINETIC AND THERMODYNAMIC STUDY

Mahmood

Aslam

Akhtar

et al. 2018

J. Chil. Chem. Soc.

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An efficient and cost effective adsorbent, activated carbon (UTAC) derived from used tea (UT) for the removal of As(III) from aqueous solutions was developed. To increase adsorption, UTAC was then impregnated with (magnetite) iron oxide particles (Fe-UTAC). The prepared adsorbents were characterized by XRD, SEM/EDX, FTIR and surface area analyzer. A comprehensive kinetic study of arsenite adsorption onto Fe-UTAC was conducted at 298-318 K and pH 8. The Richenberg model confirmed film diffusion to be the main rate limiting step. The removal of As(III) from aqueous solution onto Fe-UTAC was carried out as a function of temperature, concentration and pH. The sorption capacity (mol g -1 ) of Fe-UTAC was observed to increase with increase in arsenite concentration while a decrease in the As(III) uptake was observed by increasing the temperature of the system. The sorption capacity of Fe-UTAC was almost three and six times larger than that of UTAC and UT respectively. The effect of pH on the arsenite adsorption was significant in the pH range 7-8 which may be correlated with the stability of Fe-UTAC as no release of iron from Fe-UTAC was observed. The mean free energy calculated from DR mechanism confirmed adsorption to be chemisorption and followed ligand exchange mechanism. The thermodynamic parameters confirmed adsorption to be exothermic, spontaneous and favorable.

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“…The results also showed the importance of optimizing the oxidation time and the nitric acid concentration, in order to avoid excessive oxidation and decomposition of the gel. In fact, iron oxides were known to be good adsorbents for many metal oxyanions [61] and phosphates, but the difficulty to handle with the very fine particles has dictated the exploitation of iron-loaded adsorbents (by iron oxyhydroxide impregnation or Fe(III) ions loading) using different support media, such as activated carbons [62], activated alumina [63], graphene oxide sheets [64], agro-wastes [65]. Regarding tannin-based materials, iron-treatments were not still conveniently explored, although the interesting results presented by Ogata et al [39] show good perspectives for their application.…”

Section: Modified Tannin Gelsmentioning

confidence: 99%

Tannin-based biosorbents for environmental applications – A review

Bacelo

Santos

Botelho

2016

Chemical Engineering Journal

237

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Arsenic (III) adsorption on iron acetate coated activated alumina: thermodynamic, kinetics and equilibrium approach

Cited by 14 publications

References 28 publications

Adsorption of Aqueous As (III) in Presence of Coexisting Ions by a Green Fe-Modified W Zeolite

Adsorption of Aqueous As (III) in Presence of Coexisting Ions by a Green Fe-Modified W Zeolite

ADSORPTION OF As(III) FROM AQUEOUS SOLUTION ONTO IRON IMPREGNATED USED TEA ACTIVATED CARBON: EQUILIBRIUM, KINETIC AND THERMODYNAMIC STUDY

Tannin-based biosorbents for environmental applications – A review

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