Enhanced adsorption capacity of activated alumina by impregnation with alum for removal of As(V) from water

Tripathy, S. Swarupa; Raichur, Ashok M.

doi:10.1016/j.cej.2007.06.028

Cited by 107 publications

(57 citation statements)

References 29 publications

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“…This method is simple and convenient, and also has the potential for regeneration and sludge-free operation. Various types of adsorbents such as biomaterials [15], metal oxide/hydroxides [16][17][18][19][20][21][22], zeolites [23], and activated carbon [24] have been developed.…”

Section: Introductionmentioning

confidence: 99%

Surface-modified carbon black for As(V) removal

Borah

Satokawa

Kato

et al. 2008

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Surface-modified carbon black for As(V) removal

Borah

Satokawa

Kato

et al. 2008

Journal of Colloid and Interface Science

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“…As can be seen from Figure 4, the As (V) adsorption is high at pH 2 and decreases rapidly to pH 5 after which increase in pH does not have much effect. As(V) predominantly exists as H 2 AsO 4 -and HAsO 4 2-in the pH range 2.7 to 11.5 (Tripathy and Raichur, 2008). Acidic solutions provide sufficient protonated sites to the adsorbent which result in a net positively charged surface.…”

Section: Effect Of Initial Ph On As(v) Adsorptionmentioning

confidence: 99%

Preparation, characterization and As(V) adsorption behaviour of CNT-ferrihydrite composites

Poinern¹,

Parsonage²,

Issa³

et al. 2011

Int. J. Eng. Sci. Tech

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A Carbon nano tube (CNT)-Ferrihydrite nanocomposite was synthesized through precipitation in ethyl alcohol media. Its detailed characterization was carried out using XRD, SEM, FTIR and EDAX. The adsorption characteristics of the composite for As(V) removal were carried out as function of pH, adsorbent dose, As(V) concentration and contact time. Although pure CNT did not show any significant adsorption, CNT-Ferrihydrite proved to be a good adsorbent for arsenic. With increase in pH, the As(V) adsorption on the composite first decreased up to pH 5.0, thereafter it remained nearly constant. The adsorption followed the Langmuir isotherm model and from the data its monolayer adsorption capacity was estimated to be 44.1 mg/g. The adsorption data were best described by the pseudo-second order kinetic model.

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“…Since the FeOOH samples were porous particles that were vigorously agitated during the adsorption period, it is reasonable to assume that the rate was not limited by mass transfer from the bulk liquid to the external surface of particles. The fact that the inclined lines (inset of Figure 4) do not pass through the origin verifies this assumption, indicating simultaneously that the limiting rate step of adsorption is attributed to the intraparticle diffusion effect and the plateau to the equilibrium [33]. Figure 5 summarizes the breakthrough curves for both Sb(III) and Sb(V) uptake by the qualified FeOOH, as well as by the commercial AquAsZero.…”

Section: Kineticsmentioning

confidence: 78%

Efficiency of Iron-Based Oxy-Hydroxides in Removing Antimony from Groundwater to Levels below the Drinking Water Regulation Limits

et al. 2017

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This study evaluates the efficiency of iron-based oxy-hydroxides to remove antimony from groundwater to meet the requirements of drinking water regulations. Results obtained by batch adsorption experiments indicated that the qualified iron oxy-hydroxide (FeOOH), synthesized at pH 4 for maintaining a high positive charge density (2.5 mmol OH − /g) achieved a residual concentration of Sb(III) below the EU drinking water regulation limit of 5 µg/L by providing an adsorption capacity of 3.1 mg/g. This is more than twice greater compared either to similar commercial FeOOHs (GFH, Bayoxide) or to tetravalent manganese feroxyhyte (Fe-MnOOH) adsorbents. In contrast, all tested adsorbents failed to achieve a residual concentration below 5 µg/L for Sb(V). The higher efficiency of the qualified FeOOH was confirmed by rapid small-scale column tests, since an adsorption capacity of 3 mg Sb(III)/g was determined at a breakthrough concentration of 5 µg/L. However, it completely failed to achieve Sb(V) concentrations below 5 µg/L even at the beginning of the column experiments. The results of leaching tests classified the spent qualified FeOOH to inert wastes. Considering the rapid kinetics of this process (i.e., 85% of total removal was performed within 10 min), the developed qualified adsorbent may be promoted as a prospective material for point-of-use Sb(III) removal from water in vulnerable communities, since the adsorbent's cost was estimated to be close to 30 ± 3.4 €/10 3 m 3 for every 10 µg Sb(III)/L removed.

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Enhanced adsorption capacity of activated alumina by impregnation with alum for removal of As(V) from water

Cited by 107 publications

References 29 publications

Surface-modified carbon black for As(V) removal

Surface-modified carbon black for As(V) removal

Preparation, characterization and As(V) adsorption behaviour of CNT-ferrihydrite composites

Efficiency of Iron-Based Oxy-Hydroxides in Removing Antimony from Groundwater to Levels below the Drinking Water Regulation Limits

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