Magnetite graphene oxide encapsulated in alginate beads for enhanced adsorption of Cr(VI) and As(V) from aqueous solutions: Role of crosslinking metal cations in pH control

Vu, Huong Chi; Dwivedi, Amarendra Dhar; Le, Thao Thanh; Seo, Sung-Hee; Kim, Young Ho; Chang, Yoon Seok

doi:10.1016/j.cej.2016.08.058

Cited by 235 publications

(63 citation statements)

References 33 publications

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“…The adsorption capacity of magnetic nanoparticles/activated carbon/alginate beads was found to be higher than the non encapsulated adsorbents for methyl orange and methylene blue [48]. Vu et al [49] found that the graphene oxide/Ca-alginte beads exhibited greater adsorption efficiency for Cr 4+ and As 5+ than activated carbon and carbon nanotubes. The entrapment of the (hydro)oxide in the calcium alginate gel matrix improved the As 3+ and As 5+ sorption by 60% [50].…”

Section: Discussionmentioning

confidence: 99%

Adsorption of Phosphates from Aqueous Solutions on Alginate/Goethite Hydrogel Composite

Siwek

Bartkowiak

Włodarczyk

2019

Water

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The basic process to reduce the phosphate ions in aquatic environments is to move the phosphorus circulation processes on the water–sediment phase boundary towards depositing it in the solid phase through chemical precipitation or adsorption. Modern technologies for removal of phosphorus can be based on cheap and environmentally friendly natural polysaccharides modified with multivalent metals. In this study alginate/goethite hydrogel composite has been investigated for phosphate uptake from aqueous solutions. The composite was produced by a cross-linking reaction between sodium alginate and calcium chloride in six configurations of suspensions, which differed in goethite content. In all cases, spherical and durable capsules of alginate/goethite composite were produced. In laboratory tests, mechanical stability of the capsules at various temperatures and the coexisting ions of lake water were tested. Chemical composition of the aquatic environment had a strong influence on their mechanical stability. Static batch adsorption of phosphate studies were carried out for two adsorbents: goethite and alginate/goethite composite. The goethite gelation resulted in almost double growth of sorption capacity in the case of adsorption from deionized water and, on average, a 50% growth in adsorption from the environmental water compared to raw goethite. The alginate/goethite adsorbent removed phosphate in a wide pH spectrum—from 4 to 10. Results suggest that the proposed adsorbent has potential for the removal of phosphate from contaminated water.

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Section: Discussionmentioning

confidence: 99%

Adsorption of Phosphates from Aqueous Solutions on Alginate/Goethite Hydrogel Composite

Siwek

Bartkowiak

Włodarczyk

2019

Water

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“…And the SAbased carbon aerogels are widely used in lithium-ion battery, electrocatalyst, supercapacitors, water treatment and other fields. [39][40][41][42][43][44][45][46] Carboxylated chitosan is a modified product of chitin which is the second largest renewable natural organic polymer. Hence, carboxylated chitosan is an ideal precursor for the preparation of N-containing carbon aerogels.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen‐Containing Carbon Aerogels with High Specific Surface Area for Supercapacitors

et al. 2019

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Electrode materials have significant influence on the performance of supercapacitors. Hence, the synthesis of electrode materials with a low cost and excellent electrochemical performance has immense value. Herein, sodium alginate and carboxylated chitosan were used as raw materials to synthesize nitrogen‐containing porous carbon aerogels (NPCAs). The effect of carbonization temperature on the structure and property of NPCA was studied. The specific surface area of NPCA can reach 2028 m2 g−1. The electrochemical performance of NPCA was tested by using a three‐electrode system and a two‐electrode system. The specific capacitance of NPCA‐800 (800 represents the carbonization temperature) in the three‐electrode system can reach 213.1 F g−1 and 146.8 F g−1 at current densities of 1.0 A g−1 and 10 A g−1, respectively. Meanwhile, NPCA‐800 exhibits an excellent cycle performance and the specific capacitance can retain 91.77 % after 20 000 cycles. The energy density of NPCA‐800 can reach 28.8 Wh kg−1 at a power density of 0.28 kW kg−1 in the two‐electrode system.

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“…Insoluble synthetic or natural polymers were used for preparation of GO-containing composites: polyethyleneimine [25], polyaniline [26], chitosan [27]. GO was also embedded to alginate beads [28]. Chromate [23][24][25][26]28] and arsenate anions [27,28] can be effectively removed from water using the obtained material.…”

Section: Introductionmentioning

confidence: 99%

“…GO was also embedded to alginate beads [28]. Chromate [23][24][25][26]28] and arsenate anions [27,28] can be effectively removed from water using the obtained material. GO evidently increases surface area of the polymers facilitating adsorption of anions.…”

Section: Introductionmentioning

confidence: 99%

Composite adsorbents including oxidized graphene: effect of composition on mechanical durability and adsorption of pesticides

Dzyazko¹,

Ogenko²,

Shteinberg³

et al. 2019

Him. Fiz. Tehnol. Poverhni

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A number of multifunctional composite adsorbents based on hydrated zirconium dioxide has been synthesized. The inorganic ion exchanger contained nanosheets of oxidized graphene (GO), the modifier amount was 0.5-7 mass. %. The composites were investigated with methods of transmission electron microscopy and nitrogen adsorption-desorption, macropores were determined using water as a working liquid. It has been found that increasing of GO content depresses microporosity, but meso-and macroporosity grow. Crushing strength reduces exponentially with increase of total pore volume from 0.49 to 0.62 cm 3 g -1 . Removal of phenol from water containing also inorganic ions was investigated. Adsorption capacity reaches 0.15-0.85 (phenol), 0.5-0.85 (Ca 2+ and Mg 2+ ), 0.005-0.045 (SO 4 2-) mmol g -1 . When the GO content in the composites is 0.5-2 %, this carbon addition improves adsorption of cations and organic molecules comparing with hydrated zirconium dioxide. Further increase in GO amount causes no sufficient effect on adsorption due to decline of specific surface area of the composites. It has been suggested that the optimal content of the modifier, which provides the maximal growth of adsorption capacity, is 2 %. This composite is obtained in a form of large granules (0.3-0.5 mm), their crushing strength is 9 bar. The material was applied to removal of pesticides (acetomipride, carboxine, epoxyconazole and thiamethoxam) from aqueous multicomponent solution under batch conditions. The residual content of carboxine and epoxyconazole, molecules of which contain benzene rings, is lower than the maximal allowable concentration. No deterioration of pesticide uptake has been found after five cycles of adsorption-regeneration.

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Magnetite graphene oxide encapsulated in alginate beads for enhanced adsorption of Cr(VI) and As(V) from aqueous solutions: Role of crosslinking metal cations in pH control

Cited by 235 publications

References 33 publications

Adsorption of Phosphates from Aqueous Solutions on Alginate/Goethite Hydrogel Composite

Adsorption of Phosphates from Aqueous Solutions on Alginate/Goethite Hydrogel Composite

Nitrogen‐Containing Carbon Aerogels with High Specific Surface Area for Supercapacitors

Composite adsorbents including oxidized graphene: effect of composition on mechanical durability and adsorption of pesticides

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