Removal of arsenic from aqueous solution: A study of the effects of pH and interfering ions using iron oxide nanomaterials

Luther, Steven; Borgfeld, Nathan; Kim, Ji-Soo; Parsons, Jasón G.

doi:10.1016/j.microc.2011.10.001

Cited by 127 publications

(66 citation statements)

References 27 publications

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“…the decrease of pH from 7 to 2. Similar trends of the effects of pH have commonly been observed with iron oxide-based adsorbents and can be explained by the changes in surface charge of the adsorbents and the arsenic speciation [7][8][9]12,[21][22][23][24]26,32,34,37,38]. Figure 9(b) shows the dependence of surface charge of FeO x -GO-80 on pH.…”

Section: Arsenic Adsorption With Feo X -Go Nanocompositessupporting

confidence: 75%

“…[3,4] Compared to other types of adsorbents, iron oxide-derived adsorbents have received enormous attention for arsenic removal due to their superior performance for arsenic adsorption [5]. In this regard, iron oxides in various forms have been studied and developed for arsenic removal, including amorphous iron oxide [6,7], goethite (α-FeOOH) [8], hematite (α-Fe 2 O 3 ) [8,9], crystalline magnetic maghemite (γ-Fe 2 O 3 ) and magnetite (Fe 3 O 4 ) nanoparticles [10][11][12], as well as other iron oxide nanostructures [13][14][15][16][17][18][19][20]. Among them, amorphous iron oxides show the highest adsorption capacity (as high as 260 and 200 mg g -1 for As(III) and As(V), respectively) due to its highest specific surface area [8], but with the shortcomings of its difficulty (as fine powders) for separation following adsorption and its tendency to form low-surface-area crystalline iron oxides during preparation [4].…”

Section: Introductionmentioning

confidence: 99%

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High-performance iron oxide–graphene oxide nanocomposite adsorbents for arsenic removal

Hmidi

2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

189

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We report the synthesis of a new range of iron oxide-graphene oxide (GO) nanocomposites having different iron oxide content (36-80 wt%) as high-performance adsorbents for arsenic removal. Synthesized by co-precipitation of iron oxide on GO sheets that are prepared by an improved Hummers method, the iron oxide in the nanocomposites is featured primarily in the desirable form of amorphous nanoparticles with an average size of ca. 5 nm. This unique amorphous nanoparticle morphology of the iron oxide beneficially endows the nanocomposites with high surface area (up to 341 m 2 g -1 for FeO x -GO-80 having the iron oxide content of 80 wt%) and predominant mesopore structures, and consequently increased adsorption sites and enhanced arsenic adsorption capacity. FeO x -GO-80 shows high maximum arsenic adsorption capacity (q max ) of 147 and 113 mg g −1 for As(III) and As(V), respectively. These values are the highest among all the iron oxide-GO/reduced GO composite adsorbents reported to date and are also comparable to the best values achieved with various sophisticatedly synthesized iron oxide nanostructures. More strikingly, FeO x -GO-80 is also demonstrated to nearly completely (>99.98%) removes arsenic by reducing the concentration from 118 (for As(III)) or 108 (for As(V)) to < 0.02 µg L −1 , which is far below the limit of 10 µg L −1 recommended by the World Health Organization (WHO) for drinking water. The excellent adsorption performance, along with their low cost and convenient synthesis, makes this range of adsorbents highly promising for commercial applications in drinking water purification and wastewater treatment.

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Section: Arsenic Adsorption With Feo X -Go Nanocompositessupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

High-performance iron oxide–graphene oxide nanocomposite adsorbents for arsenic removal

Hmidi

2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

189

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“…Further adsorption experiments were conducted at pH 6.7 and 6.0 for Zn(II) and As(III) respectively. Similar results for the dependence of the uptake of Zn(II) and As(III) from solution on the pH of the solution have been reported [20,[38][39][40]. Figure 3 shows the effect of time on the uptake of Zn(II) and As(III) from aqueous solution by MNP-Maph.…”

Section: Effect Of Phsupporting

confidence: 82%

Uptake of Zn2+ and As3+ from Wastewater by Adsorption onto Imine Functionalized Magnetic Nanoparticles

Ojemaye

Okoh

2018

Water

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Abstract:In this paper, imine functionalized magnetic nanoparticles (MNP-Maph) were employed to aqueous solutions for the uptake of Zn(II) and As(III). Characterization of the material showed the successful synthesis of this material. Factors affecting the uptake of metal ions in aqueous solution such as change in pH, time, adsorbent dose, adsorbate concentration, and temperature were investigated and optimized to determine the best experimental conditions for the effective adsorption of Zn(II) and As(III) from wastewater samples. The adsorption capacity of MNP-Maph followed similar patterns as that of amine functionalized magnetic nanoparticles (MNP-NH 2 ) for the uptake of both metal ions from aqueous solution when solution pH was varied. Higher pH values favored the uptake of Zn(II) and As(III) by using both adsorbents. Also, increasing the contact time and temperature yielded a higher uptake of Zn(II) and As(III). Both processes can best be described with a pseudo-second order kinetic model, while the Langmuir maximum adsorption capacity (q m ) for Zn(II) increased from 35.83 to 54.53 mg g −1 , and for As(III) from 50.08 to 57.60 mg g −1 .Of note is that the q m of As(III) was higher than that of Zn(II) because of the lower concentration of As(III) in solution compared to that of Zn(II), and thermodynamic parameters indicated that the adsorption processes were heat absorbing and rapid in nature. Experiments to evaluate if the adsorbent could be recycled showed excellent recyclability capacity of MNP-Maph after seven runs. Lastly, application of MNP-Maph for the uptake of Zn(II) and As(III) from municipal wastewater samples showed remarkable sorption performance confirming the potential of imine functionalized magnetic nanoparticles as an excellent adsorbent for the uptake of metal ions from aqueous solutions.

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“…For example, a study of As(III) and As(V) ions to the Fe 3 O 4 nanomaterial [70,122] observed similar trend on an iron oxide-coated cement (IOCC) adsorption capacity of As(III) removal and [123] on activated carbon. Also, a high adsorption percentage was observed at higher pH for As(V) adsorption over activated charcoal and bone char adsorbents.…”

Section: Effects Of Ph On Arsenic Removalmentioning

confidence: 83%

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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Removal of arsenic from aqueous solution: A study of the effects of pH and interfering ions using iron oxide nanomaterials

Cited by 127 publications

References 27 publications

High-performance iron oxide–graphene oxide nanocomposite adsorbents for arsenic removal

High-performance iron oxide–graphene oxide nanocomposite adsorbents for arsenic removal

Uptake of Zn2+ and As3+ from Wastewater by Adsorption onto Imine Functionalized Magnetic Nanoparticles

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

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