Sorption of As(V) ions by akaganéite-type nanocrystals

Deliyanni, Eleni A.; Bakoyannakis, Demetris N.; Zouboulis, Anastasios; Matis, K. A.

doi:10.1016/s0045-6535(02)00351-x

Cited by 279 publications

(152 citation statements)

References 15 publications

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“…SPION functionalization provides a more active adsorption sites accessible to both arsenite and arsenate. The most important reason for the observed increase of is the decrease of SPION aggregation by a dispersion that leads to a higher availability of adsorption positions [10,[44][45][46][47][48][49][50][51].…”

Section: Adsorption Capacity Comparison With Similar Adsorbent Systemsmentioning

confidence: 99%

Arsenate removal with 3-mercaptopropanoic acid-coated superparamagnetic iron oxide nanoparticles

Morillo

Uheida

Pérez

et al. 2015

Journal of Colloid and Interface Science

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In the present work, superparamagnetic iron oxide nanoparticles (SPION) surface-coated with 3-mercaptopropanoic acid (3-MPA) were prepared and their feasibility for the removal of arsenate from dilute aqueous solutions was demonstrated. The synthesized 3-MPA-coated SPION was characterized using transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and Fourier transform infra-red spectrometry (FTIR). Separation efficiency of the coated nanoparticles and the equilibrium isotherm of arsenate adsorption were investigated. The obtained results reveal the arsenate adsorption to be highly pH-dependent, and the maximum adsorption was attained in less than 60 minutes. The resulting increase of 3-MPA-coated SPION adsorption capacity to twice the adsorption capacity of SPION alone under the same conditions is attributed to the increase of active adsorption sites. An adsorption reaction is proposed. On the other hand, efficient recovery of arsenate from the loaded nanoparticles was achieved using nitric acid (HNO 3 ) solution, which also provides a concentration over the original arsenate solution. HIGHLIGHTS• Feasibility of using SPION modified with 3MPA for the removal of As(V).• The adsorbent system results in an effective sorption for selective As(V) removal.• The adsorption capacity for As(V) is higher comparing with other adsorbent systems.• Adsorption mechanism has been proposed as the most suitable considering the results.

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Section: Adsorption Capacity Comparison With Similar Adsorbent Systemsmentioning

confidence: 99%

Arsenate removal with 3-mercaptopropanoic acid-coated superparamagnetic iron oxide nanoparticles

Morillo

Uheida

Pérez

et al. 2015

Journal of Colloid and Interface Science

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“…The interaction between arsenate ion and metal oxide was modeled by assuming ligand exchange reactions as follows: where M-OH is a surface hydroxyl group and M-A is the adsorbed species. According to Deliyanni [10] and Pedersen's [26] report, a strong adsorption of arsenate occurs on the Fe, Al sites and Fe, Al oxides are effective sites for arsenate adsorption. MRM is a mixture of Fe, Al oxides and similar adsorption behavior happened.…”

Section: Effect Of Phmentioning

confidence: 99%

“…Among them, adsorption was regarded as a reliable and economical technique. Many kinds of adsorbents such as iron oxide-loaded slag [4], Fe-oxide impregnated activated carbon [9], akaganeite [10], red mud [11,12] have been developed for the removal of arsenic. Adsorption will provide an attractive technology if the adsorbent is cheap and ready for use.…”

Section: Introductionmentioning

confidence: 99%

Arsenate removal from aqueous solutions using modified red mud

Zhang

Liu

Luan

et al. 2008

Journal of Hazardous Materials

109

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“…At present, few of materials possess the property combining sufficient adsorption efficiency and excellent catalytic activity. There is a growing interest in inexpensive high surface area materials, especially metal oxides, and in their unique applications including adsorption and chemical catalysis [8,9]. It is known that the smaller the particles of adsorbent or catalyst are, the better its properties are, but the more difficult the recovery is.…”

Section: Introductionmentioning

confidence: 99%

Removal of azo-dye Acid Red B (ARB) by adsorption and catalytic combustion using magnetic CuFe2O4 powder

et al. 2004

Applied Catalysis B: Environmental

152

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The effectiveness of magnetic CuFe 2 O 4 powder as adsorbent/catalyst for the removal of azo-dye Acid Red B (ARB) from water by adsorption and subsequent catalytic combustion was studied. Magnetic CuFe 2 O 4 powder showed excellent adsorption properties towards ARB at pH < 5.5, and it could be conveniently recovered by magnetic separation technology after adsorption. The combustion decomposition of ARB in the presence or absence of CuFe 2 O 4 was studied by a system for thermal degradation studies (STDS) and in situ FTIR. The results indicated that different reactive pathways existed for the combustion under different conditions. In the presence of CuFe 2 O 4 , the temperature needed for oxidation reaction and for combustion was 150 and 300 • C, respectively. The reaction products were observed to be SO 2 , CO 2 , H 2 O, and nitrate. There was neither volatile organic compound (VOCs) emitted to atmosphere during reaction nor organic matter deposited on the surface of CuFe 2 O 4 after the combustion. Comparatively, in the absence of CuFe 2 O 4 , the oxidation and combustion of ARB required a higher temperature (300 and 500 • C, respectively) and produced a lot of toxic organic compounds emitted to atmosphere besides SO 2 , CO 2 and H 2 O during the reaction. In addition, sulfate was generated instead of nitrate. The experiments of adsorption-combustion cycles demonstrated that there was no evident change in adsorption properties and catalytic activity of magnetic CuFe 2 O 4 powder after seven cycles.

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Sorption of As(V) ions by akaganéite-type nanocrystals

Cited by 279 publications

References 15 publications

Arsenate removal with 3-mercaptopropanoic acid-coated superparamagnetic iron oxide nanoparticles

Arsenate removal with 3-mercaptopropanoic acid-coated superparamagnetic iron oxide nanoparticles

Arsenate removal from aqueous solutions using modified red mud

Removal of azo-dye Acid Red B (ARB) by adsorption and catalytic combustion using magnetic CuFe2O4 powder

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