Experimental and theoretical studies of chitosan modified titanium dioxide composites for uranium and europium removal

Wang, Jian; Huo, Yingzhong; Ai, Yuejie

doi:10.1007/s10570-020-03337-w

Cited by 18 publications

(3 citation statements)

References 47 publications

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“…As the adsorption process is a simple and low-cost process, many researchers have investigated the use of adsorbents. Hydroxyapatite [ 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 ], aluminum oxide [ 82 ], silicon dioxide [ 83 ], hematite [ 84 ], akageneite [ 85 , 86 ] zeolite [ 87 ], activated carbon [ 88 ] and titanium [ 89 ] are some of the adsorbents previously studied. HAp has been widely studied for its application as an efficient radioactive ion adsorbent.…”

Section: Adsorption Of Radionuclides From Aqueous Solutionsmentioning

confidence: 99%

Applications of Nano Hydroxyapatite as Adsorbents: A Review

et al. 2022

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Nano hydroxyapatite (Ca10(PO4)6(OH)2, HAp) has aroused widespread attention as a green and environmentally friendly adsorbent due to its outstanding ability in removing heavy metal ions, radio nuclides, organic pollutants and fluoride ions for wastewater treatment. The hexagonal crystal structure of HAp supports the adsorption mechanisms including ionic exchange reaction, surface complexation, the co-precipitation of new partially soluble phases and physical adsorption such as electrostatic interaction and hydrogen bonding. However, nano HAp has some drawbacks such as agglomeration and a significant pressure drop during filtration when used in powder form. Therefore, instead of using nano HAp alone, researchers have worked on modificationsand composites of nano HAp to overcome these issues and enhance the adsorption capacity. The modification of cationic doping and organic molecule grafting for nano HAp can promote the immobilization of ions and then increase adsorption capacity. Developing nano HAp composite with biopolymers such as gelatin, chitosan and chitin has proven to obtain a synergetic effect for improving the adsorption capacity of composites, in which nano HAp fixed and dispersed in polymers can playmuch more of a role for adsorption. This review summarizes the adsorption properties and adsorbent applications of nano HAp as well as the methods to enhance the adsorption capacity of nano HAp.

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Section: Adsorption Of Radionuclides From Aqueous Solutionsmentioning

confidence: 99%

Applications of Nano Hydroxyapatite as Adsorbents: A Review

et al. 2022

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“…Moreover, the R 2 and SEE values used to prove the best fit of isotherm model confirmed the distinction of the Langmuir model in explaining the adsorption behavior of Eu 3+ onto AO- f -ARHC. A comparative account of Eu 3+ adsorption by AO- f -ARHC based on Q m is presented in Table S4. − …”

Section: Resultsmentioning

confidence: 99%

Adsorption of Europium (III) on Amidoxime-Functionalized Ficus virens Aerial Root Hydrochar: Statistical Optimization, Equilibrium Isotherm, and Kinetic Analyses

Abbasi,

Khan,

Khan

2024

Ind. Eng. Chem. Res.

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The long-living radionuclides existing in nuclear wastes are a serious ecological threat. The present study delineates the application of amidoximefunctionalized Ficus virens aerial roots derived hydrochar (AO-f-ARHC) as a novel multifunctional absorbent material for retention of aqueous Eu 3+ ions. The physicochemical characterization of AO-f-ARHC was accomplished utilizing X-ray diffraction (XRD), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDX), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FTIR) techniques. The adsorptive effectiveness of the synthesized adsorbent was estimated by using central composite design (CCD). Langmuir saturation capacity (Q m ) was 166 mg/g at 313 K. The adsorption kinetics data complied with pseudo second order kinetic model. The process spontaneity and endothermic behavior were manifested by the negative ΔG°(= −5.10 kJ/mol) and positive ΔH°(= 21.26 kJ/mol), respectively, at 313 K. The mechanism of adsorption primarily included electrostatic interaction, metal-π interaction, and pore-filling. AO-f-ARHC's Eu 3+ uptake efficacy in the presence of coexisting ions and real water samples along with the reusability potential confirmed its competence in wastewater treatment.

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“…Similarly, a CS polymer was reacted with aminotriazole thiol to produce CS/azole resin that was utilized for uranium ions separation [18]. Furthermore, CS-modified titanium dioxide was manufactured to eliminate uranium and europium ions from solutions [19], polyvinylpyrrolidone/CS was utilized for the elimination of U(VI) [20]. Coupling CS with aminonaphthol sulfonic acid to become a brilliant synergistic influence of aminonaphthol sulfonic/CS employed to remove thorium ions [21].…”

Section: Introductionmentioning

confidence: 99%

Peculiarities of u(vi) adsorption from acidic solution using chitin-derived chitosan as a low-priced bio-adsorbent

El-Rahem

Taher

Cheira

2021

Al-Azhar Bulletin of Science

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Chitosan (CS) as an inexpensive bio-adsorbent was set by chitin deacetylation using sodium hydroxide. The prepared bio-adsorbent was distinguished via Scanning electron microscopy (SEM), X-ray diffraction (XRD), Energy dispersive spectroscopy (EDX), Brunner-Emmett-Teller surface area (BET) analyzer, and Fourier transform infrared spectroscopy (FTIR). Chitosan implemented for U(VI) adsorption, and the studied parameters that are pH, time of contact, initial concentration, and temperature, were determined by batch technique. The maximum uptake of CS adsorbent is 88.0 mg/g at 200 mg/L initial U(VI) concentration, pH 3.5, and 25 °C. The kinetic information agreed with the pseudo-second-order model, which considered the attendance of chemisorption. The equilibrium of adsorption reaction gained within 50 min, and equilibrium information well satisfaction for Langmuir model confirmed that U(VI) adsorbed at chitosan monolayer coverage area. Also, the chitosan bio-adsorbent was indeed regenerated by 1M H2SO4 and 1/50 S/L ratio for 75 min of contact. Seven rounds of adsorption-desorption investigations attended to scrutinize the working applicability and renewed application of the bio-adsorbent.

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Experimental and theoretical studies of chitosan modified titanium dioxide composites for uranium and europium removal

Cited by 18 publications

References 47 publications

Applications of Nano Hydroxyapatite as Adsorbents: A Review

Applications of Nano Hydroxyapatite as Adsorbents: A Review

Adsorption of Europium (III) on Amidoxime-Functionalized Ficus virens Aerial Root Hydrochar: Statistical Optimization, Equilibrium Isotherm, and Kinetic Analyses

Peculiarities of u(vi) adsorption from acidic solution using chitin-derived chitosan as a low-priced bio-adsorbent

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