Facile synthesis of copper ferrocyanide-embedded magnetic hydrogel beads for the enhanced removal of cesium from water

Lee, Inae; Park, Chan Woo; Yoon, Seung Soo; Yang, Hee‐Man

doi:10.1016/j.chemosphere.2019.02.199

Cited by 54 publications

(27 citation statements)

References 43 publications

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“…3b). One weak absorption peak around 592 cm -1 could be ascribed to the stretching vibration of Fe-N and the other strong absorption peak in the vicinity of 2116 cm -1 presented the characteristic vibration of C:N [18]. These information can confirm the successful formation of KNi[Fe(CN) 6 ] in the substrate of PVA/GO/Ni 2?…”

Section: Structure Characterizationmentioning

confidence: 70%

“…Due to high affinity and selectivity for cesium (3.29 A ˚), this type of materials has been extensively used for removal of cesium [16,17]. However, pristine PB or PBAs synthesized by precipitation method were ultrafine powder and almost inseparable from water, and this intrinsic drawback severely limited their practical application [18].…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

“…To overcome this difficulty, much work has been conducted to develop a variety of porous supports to immobilize PB/PBAs, like biopolymers (chitosan and alginate), porous silicas, magnetic materials and polyvinyl alcohol sponges [18][19][20][21]. The immobilization strategy has been demonstrated to be a powerful strategy in addressing the separation problem.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

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Hexacyanoferrate-modified polyvinyl alcohol/graphene oxide aerogel as an efficient and retrievable adsorbent for cesium

Huo

2021

J Mater Sci

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While hexacyanoferrate and its analogues are specific adsorbents for elimination of cesium ions (Cs ? ), they seem to encounter a major challenge of separation from solution. To solve this difficulty, a novel aerogel adsorbent (polyvinyl alcohol/graphene oxide/KNi[Fe(CN) 6 ], denoted as PVA/GO/KNi[Fe(CN) 6 ]) was designed by a synergistic cross-linking reaction coupled with in situ precipitation strategy. PVA and Ni 2? firstly played synergistic roles in reinforcement of interwoven structure, and Ni 2? coordinated with [Fe(CN) 6 ] 3to produce KNi[Fe(CN) 6 ] in situ in the following step. Characterization analysis revealed a hierarchical structure of the aerogel composed of GO sheets and nanoparticles. This unique structure enhanced adsorption performance compared with PVA/GO. Results indicated that pseudo-second-order model (R 2 = 0.9971) and intraparticle diffusion model (R 2 = 1.000, 0.9959 and 0.8513) fitted the kinetic data well, suggesting that the rate-limiting step was governed by the chemisorption and diffusion mechanism. Isotherm data were better described by the Langmuir model (R 2 = 0.9970), indicating monolayer homogeneous adsorption. The structural investigation verified that the substitution of Cs ? for K ? (lattice) or for H ? (carboxyl groups) was the possible adsorption mechanism. The as-prepared adsorbent exhibited satisfactory adsorption capacity of 47.66 mg/g and a merit of easy separation (as a monolith aerogel) and may be taken as a potential candidate for Cs ? cleanup.

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Section: Structure Characterizationmentioning

confidence: 70%

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Section: Graphical Abstract Introductionmentioning

confidence: 99%

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Hexacyanoferrate-modified polyvinyl alcohol/graphene oxide aerogel as an efficient and retrievable adsorbent for cesium

Huo

2021

J Mater Sci

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“…Being the most frequently used experimental method for the derivation of adsorption isotherms the results of the exp#2 were used for fitting the experimental data with the Langmuir and Freundlich models. The linear form of the Langmuir sorption isotherm [43] is (5):…”

Section: Effect Of Metal Ions Initial Concentration and Cryogels Loading For Adsorption Isothermsmentioning

confidence: 99%

“…The removal of heavy metals from water and wastewater is essential because of the numerous adverse effects on human health and the environment [ 1 , 4 , 5 , 6 , 7 ]. Several methods are available such as chemical precipitation [ 8 ], coagulation/flocculation [ 9 ], membrane filtration [ 10 ], ion-exchange [ 11 ], bioremediation [ 12 ] and adsorption [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Removal of Cd2+ from Water by Use of Super-Macroporous Cryogels and Comparison to Commercial Adsorbents

et al. 2020

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In this study amphoteric cryogels were synthesized by the use of free-radical co-polymerization of acrylate-based precursors (methacrylic acid and 2-acrylamido-2-methyl-1-propansulfonic acid) with allylamine at different ratios. The physico-chemical characteristics of the cryogels were examined using SEM/EDX, FT-IR, XPS and zeta potential measurements. The cryogels were tested toward Cd2+ removal from aqueous solutions at various pH and initial concentrations. Equilibrium studies revealed a maximum sorption capacity in the range of 132–249 mg/g. Leaching experiments indicated the stability of Cd2+ in the cryogel structure. Based on kinetics, equilibrium and characterization results, possible removal mechanisms are proposed, indicating a combination of ion exchange and complexation of Cd2+ with the cryogels’ surface functional groups. The cryogels were compared to commercially available adsorbents (zeolite Y and cation exchange resin) for the removal of Cd2+ from various water matrices (ultrapure water, tap water and river water) and the results showed that, under the experimental conditions used, the cryogels can be more effective adsorbents.

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Hydrogel Nanocomposite Adsorbents and Photocatalysts for Sustainable Water Purification

Kumar

Gusain

Pandey

et al. 2022

Adv Materials Inter

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Anthropogenic actions, environmental catastrophes, urbanization, population growth, and industrialization generate toxic pollutants in water bodies. The most pollutants are heavy metals and metalloids, dyes, volatile organic compounds, pharmaceuticals, pesticides, radionuclides, aromatic hydrocarbons, oils, polycyclic aromatic hydrocarbons, microbes/pathogens, and microplastics that can be in different forms and concentrations. [3][4][5] Globally, approximately 2 million tons of pollutants from agriculture, industrial, and sewage waste are released into water streams, which pose severe health risks and cause the deaths of more than 1400 people every day. [6] Thus, developing efficient, economical, environmentalfriendly, and scalable technologies for the purification of wastewater and seawater is urgently required. To fulfill the shortage of clean water, affordable technologies can be used to transform unconventional water reserves (such as wastewater, rainfall, seawater, and brackish water) into potable water. Recently, numerous water treatment technologies, including coagulation/flocculation, filtration, chemical precipitation, aerobic/anaerobic processing, biological treatment, electrochemically precipitation, advanced oxidation processing, membrane separation, ion-exchange, adsorption, solar/thermal distillation/evaporation, crystallization, and photocatalysis, have emerged to offer practical solutions to water pollution management. [7][8][9][10][11][12][13][14] Among them, adsorption and photocatalysis technologies have garnered significant attention from the research community due to their cost-effectiveness, high performance, Hydrogels have been employed for water purification applications, but their performance and strength are unsatisfactory for widespread adoption. Recently, hydrogel nanocomposites have been proposed to resolve the inherent challenges faced by hydrogels for water treatment. This review comprehensively analyzes hydrogel nanocomposites for water treatment using adsorbent and photocatalysis techniques. The structure, classification, and tunable synthesis methods of hydrogels are explained. Further, how hydrogels can be incorporated with functional nanoparticles (NPs) and can be used as templates/precursors for developing advanced 3D architectures, including the formation of hydrogel nanocomposite beads and 3D printing objects are discussed. Finally, the structure-property relationships of hydrogel nanocomposites are critically reviewed by considering introductory gelation chemistry, such as swelling characteristics, mechanical properties, stimuli-responsiveness, and ionic/electronic conduction. The extensive cross-linking of polymer chains with NPs offers high mass/charge transport, high surface areas, and enhanced polymer-water interactions to achieve high-performing adsorbents and photocatalysts. Several motivating examples of emerging NP-containing hydrogel nanocomposites for use in adsorbents and photocatalysis have been discussed. Such efforts validated the excellent technological pote...

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Facile synthesis of copper ferrocyanide-embedded magnetic hydrogel beads for the enhanced removal of cesium from water

Cited by 54 publications

References 43 publications

Hexacyanoferrate-modified polyvinyl alcohol/graphene oxide aerogel as an efficient and retrievable adsorbent for cesium

Hexacyanoferrate-modified polyvinyl alcohol/graphene oxide aerogel as an efficient and retrievable adsorbent for cesium

Removal of Cd2+ from Water by Use of Super-Macroporous Cryogels and Comparison to Commercial Adsorbents

Hydrogel Nanocomposite Adsorbents and Photocatalysts for Sustainable Water Purification

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