Adsorption of U(VI) onto the carboxymethylated chitosan/Na-bentonite membranes: kinetic, isothermic and thermodynamic studies

Zhou, Limin; Ouyang, Jinbo; Shehzad, Hamza; Zhang, Le; Zhao, Li; Adesina, Adesoji A.

doi:10.1007/s10967-018-6009-8

Cited by 32 publications

(6 citation statements)

References 25 publications

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“…Secondly, the pH initial solutions of the obtained suspensions under consideration were compared with the pH of the solutions in the equilibrium state, and the results are shown in Figure 10. Carboxymethylated chitosan/Nabentonite membranes 5 115 [28] Amine-functionalized magnetite 5.5 27.5 [29] Activated cellulose and silica-grafted cellulose 4-7 105 [30] Tripolyphosphate-intercalated LDH (TPP-LDH) 5.0 [32] Phosphorylated graphene oxide foam (phos-GOF) 5-7 483 [33] Phosphate-decorated carboxymethyl cellulose (CMCP) 5 977.54 [34] HDTMA-diatomite 158.8/Complexation [45] As shown in Figure 10, the pH values were significantly changed for the adsorption of the U(VI) ions by the studied adsorbents from the aqueous solutions. The decrease in pH upon adsorption of the U(VI) ions by the P-containing samples (DIT-Vin-PA cov , DIT-PA and DIT-Vin-PA in ) was higher compared with the natural diatomite.…”

Section: Effects Of the Phosphonic Groups Modification Of Diatomite O...mentioning

confidence: 99%

“…A variety of adsorbents with different ligands have been designed for the exaction of radionuclides, such as graphene oxide, layered double hydroxide(LDH) [9,10], nanoscale zero-valent iron and direct-reduced iron (sponge iron) [11], magnetite [8,[12][13][14], resin [15], goethite [16,17], europium hydroxide [18], self-assembled monolayers on nanocomposites [19][20][21], silica [22] and polymeric derivatives [23][24][25], carbon nanotubes, modified biowaste [26], natural minerals [27], and nano-sized filtration membranes [28]. The surface of these materials can be modified with functional groups or molecules, such as natural polymer (chitin or chitosane) [21], aminoacids [18], acidic [29] and chelating [10] groups, amidoxime-functionalized macroporous fibrous polymeric [23], poly(acrylic acid) [24], and activated cellulose and silica grafted cellulose [30].…”

Section: Introductionmentioning

confidence: 99%

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Optimal Synthesis of Novel Phosphonic Acid Modified Diatomite Adsorbents for Effective Removal of Uranium(VI) Ions from Aqueous Solutions

et al. 2023

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The authors synthesized a series of functionalized diatomite-based materials and assessed their U(VI) removal performance. Phosphor-derivative-modified diatomite adsorbents were synthesized by the three-route procedures: polymerisation (DIT-Vin-PAin), covalent (DIT-Vin-PAcov), and non-covalent (DIT-PA) immobilization of the functional groups. The effects of the diatomite modification have been studied using powder XRD, solid state NMR, FTIR spectroscopy, electronic microscopy, EDX, acid–base titrations, etc. The maximum adsorption capacities of DIT-Vin-PAcov, DIT-PA, and DIT-Vin-PAin samples were 294.3 mg/g, 253.8 mg/g, and 315.9 mg/g, respectively, at pH0 = 9.0. The adsorption amount of U(VI) ions using the prepared DIT-Vin-PAin was 95.63%, which is higher compared with that of the natural diatomite at the same concentration. The adsorption studies demonstrated that the phosphonic and hydroxyl groups on the surface of the diatomite played pivotal roles in the U(VI) adsorption. The U(VI) ions as a “hard” Lewis acid could easily form bonds with the “hard” donor P-containing ligands, so that the as-prepared DIT-Vin-PAin sample had excellent adsorption properties. The monolayer adsorption of the analyte on the surface of the raw diatomite and DIT-PA was observed. It was found from the thermodynamic parameters that the uptake of the U(VI) ions by the obtained adsorbents was a spontaneous process with an endothermic effect. Findings of the present work highlight the potential for using modified diatomite as effective and reusable adsorbents for the extraction of U(VI) in the waste, river, and tap waters with satisfactory results.

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Section: Effects Of the Phosphonic Groups Modification Of Diatomite O...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimal Synthesis of Novel Phosphonic Acid Modified Diatomite Adsorbents for Effective Removal of Uranium(VI) Ions from Aqueous Solutions

et al. 2023

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“…Liu et al 228 synthesized PANI/bentonite nanoclay composites by plasma-induced polymerization to remove radioactive U 6+ ions from aqueous solutions where temperature, pH, and ionic strength affect the adsorption of U 6+ (10 mg L −1 ) on its surfaces. The adsorption capability is significantly enhanced due to solid complexation in the presence of humic acid ( pH < 6.5), while the opposite action is observed at pH > 6.5.…”

Section: Water Treatmentmentioning

confidence: 99%

Sustainable and safer nanoclay composites for multifaceted applications

Padil

Murugesan

et al. 2022

Green Chem.

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“…Therefore, it is necessary to modify Chit-based materials via the addition of other substances such as ionic liquids, inorganic additives, clays, hydroxyapatites, and other polymers. Over the past two decades, many studies investigated the physicochemical properties and structure of Chit materials using different experimental techniques [ 7 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. Reports show that the mechanical properties of Chit composites increase significantly with increasing concentrations of clays [ 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Rheological and Film-Forming Properties of Chitosan Composites

Lewandowska

Szulc

2022

IJMS

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Chitosan (Chit) and its composite films are widely used in biomedical, cosmetic, and packaging applications. In addition, their properties can be improved and modified using various techniques. In this study, the effect of the type of clay in Chit composites on the structure, morphology, and physical properties of Chit solution and films was tested. The liquid flow properties of Chit solution with and without clay were carried out using the steady shear test. Chit films containing clay were obtained using the solution-casting method. The morphology, structure, and physical properties of the films were characterized by scanning electron microscopy, atomic force microscopy, infrared spectroscopy, swelling behavior, and tensile tests. The results reveal that for the Chit solution with clay (C1) containing 35 wt.% dimethyl dialkyl (C14–C18) amine, the apparent viscosity is the highest, whereas Chit solutions with other clays show reduced apparent viscosity. Rheological parameters of Chit composites were determined by the power law and Cross models, indicating shear-thinning behavior. Analytical data were compared, and show that the addition of clay is favorable to the formation of intermolecular interactions between Chit and clay, which improves in the properties of the studied composites.

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Adsorption of U(VI) onto the carboxymethylated chitosan/Na-bentonite membranes: kinetic, isothermic and thermodynamic studies

Cited by 32 publications

References 25 publications

Optimal Synthesis of Novel Phosphonic Acid Modified Diatomite Adsorbents for Effective Removal of Uranium(VI) Ions from Aqueous Solutions

Optimal Synthesis of Novel Phosphonic Acid Modified Diatomite Adsorbents for Effective Removal of Uranium(VI) Ions from Aqueous Solutions

Sustainable and safer nanoclay composites for multifaceted applications

Rheological and Film-Forming Properties of Chitosan Composites

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