Magnetic hydrogel for better adsorption of heavy metals from aqueous solutions

Souda, P.; Sreejith, Lisa

doi:10.1016/j.jece.2015.03.007

Cited by 31 publications

(10 citation statements)

References 42 publications

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“…), as well as to the type of interaction between the zinc ions and the surface of these materials. To better illustrate the performance of GG/GO composite for sorption of Zn (II), a comparison with other sorbent materials presented in the literature [38][39][40][41][42][43] was made (Table 3). As can be seen, the sorption capacity of GG/GO composite for Zn (II) obtained in this work has comparative value with those presented in the literature.…”

Section: Sorption Isothermsmentioning

confidence: 99%

“…Silk fibroin/polyethylenimine hydrogel (adsorbent dose 0.5 g/L, pH 5.5) 125.00 [41] Chitosan, itaconic acid, and methacrylic acid based hydrogel (adsorbent amount 0.035 g, pH 5.5) 105.50 [42] Poly(acrylate-acrylic acid-co-maleic acid) and poly(2-acrylamido-2-methyl-1-propanesulfonic acid) based hydrogel (adsorbent amount 0.01 g) 267.73 [43] Magnetic Poly(acrylate-acrylic acid-co-maleic acid) and poly(2-acrylamido-2-methyl-1-propanesulfonic acid) based hydrogel (adsorbent amount 0.01 g)…”

Section: Sorption Isothermsmentioning

confidence: 99%

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Synthesis, Characterization and Sorption Capacity Examination for a Novel Hydrogel Composite Based on Gellan Gum and Graphene Oxide (GG/GO)

et al. 2020

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A novel hydrogel composite based on gellan gum and graphene oxide (GG/GO) was synthesized, characterized and tested for sorption capacity in this work. The microstructural, thermogravimetric and spectroscopic analysis confirmed the formation of the GG/GO composite. Comparative batch sorption experiments revealed a sorption capacity of the GG/GO composite for Zn (II) ions of approximately 2.3 higher than that of pure GG. The GG/GO composite exhibits a maximum sorption capacity of 272.57 mg/g at a pH of Zn (II) initial solution of 6. Generally, the sorption capacity of the sorbents is approximately 1.5 higher in slightly acidic conditions (pH 6) comparative with that for strong acidic conditions (pH 3). The sorption isotherms revealed that the sorption followed a monolayer/homogenous behavior. The sorption kinetic data were well fitted by the pseudo-second-order kinetic model, and were consistent with those derived from sorption isotherms. The intraparticle diffusion was considered to be the rate-determining step. Two main sorption mechanisms for Zn (II) were identified namely, ion exchange at low pH values, and both ion exchange and chemisorption in weekly acidic conditions.

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Section: Sorption Isothermsmentioning

confidence: 99%

Section: Sorption Isothermsmentioning

confidence: 99%

Synthesis, Characterization and Sorption Capacity Examination for a Novel Hydrogel Composite Based on Gellan Gum and Graphene Oxide (GG/GO)

et al. 2020

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“…A large number of adsorbents have been studied for their ability to remove heavy metals such as bioadsorbents, activated carbon, silica, zeolites and clays. 9 Activated carbon is widely used because of its micropore texture, high specific area, high chemical stability, and excellent adsorption properties. 10 Bone char, however, is considered a mixed adsorbent composed of hydroxyapatite (calcium phosphate), calcium carbonate, and some residual carbon from pyrolysis of organic tissues.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Heavy Metals in the Presence of a Magnetic Field on Adsorbents with Different Magnetic Properties

Vázquez

Virgen

Montoya

et al. 2016

Ind. Eng. Chem. Res.

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The application of static magnetic fields during adsorption as an unconventional method for the removal of heavy metals such as Cd2+ and Zn2+ was studied in this work. Two different materials were employed as adsorbents: activated carbon from bituminous coal and bone char. The magnetic characterization of these materials reveals that the activated carbon from bituminous coal is a ferromagnetic material, while the bone char is a paramagnetic material. Both adsorbents were used as received; i.e., no additional modification was employed to alter or improve their magnetic properties. Adsorption studies included adsorption isotherms at 30 °C, at pH 5, and equilibrium times of 72 h. The adsorption results obtained depended on the magnetic nature of both the adsorbent and the adsorbate. It was determined that because of its ferromagnetism (hence, its chemical composition), the activated carbon performed better when an external magnetic field was present during the adsorption process. An increase of 63% and 15% in its adsorption capacity was measured for Cd2+ and Zn2+, respectively.

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“…Many methods have been employed for the removal of heavy metals from water such as chemical precipitation, ion change, membrane separation and adsorption. Among the methods, adsorption is regarded as the most reliable choice due to technically and economically applicability [1][2][3][4].The hydrogels having three-dimensional networks of polymer chains have attracted great interests due to their high absorb, swell and water uptake capacities [5][6][7][8]. Many polymers such as polyacrylic acid (PAAc), poly (2-hydroxyethyl methacrylate, PHEMA), polyvinyl alcohol (PVA) are used in the synthesis of hydrogels.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

http://www.hjse.hitit.edu.tr/hjse/index.php/HJSE/article/view/45

Boran

Aktı

2015

Hittite J Sci Eng

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H eavy metal pollution is a serious environmental problem and it threats human health and ecosystem due to toxic and carcinogenic effects even at low concentrations. Many methods have been employed for the removal of heavy metals from water such as chemical precipitation, ion change, membrane separation and adsorption. Among the methods, adsorption is regarded as the most reliable choice due to technically and economically applicability [1][2][3][4].The hydrogels having three-dimensional networks of polymer chains have attracted great interests due to their high absorb, swell and water uptake capacities [5][6][7][8]. Many polymers such as polyacrylic acid (PAAc), poly (2-hydroxyethyl methacrylate, PHEMA), polyvinyl alcohol (PVA) are used in the synthesis of hydrogels. The hydrogels based on PHEMA and PAAc have been

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Magnetic hydrogel for better adsorption of heavy metals from aqueous solutions

Cited by 31 publications

References 42 publications

Synthesis, Characterization and Sorption Capacity Examination for a Novel Hydrogel Composite Based on Gellan Gum and Graphene Oxide (GG/GO)

Synthesis, Characterization and Sorption Capacity Examination for a Novel Hydrogel Composite Based on Gellan Gum and Graphene Oxide (GG/GO)

Adsorption of Heavy Metals in the Presence of a Magnetic Field on Adsorbents with Different Magnetic Properties

http://www.hjse.hitit.edu.tr/hjse/index.php/HJSE/article/view/45

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