Adsorption of uranium (VI) from aqueous solution onto cross-linked chitosan

Wang, Guanghui; Liu, Jinsheng; Wang, Xuegang; Xie, Zongwu; Deng, Nansheng

doi:10.1016/j.jhazmat.2009.02.157

Cited by 333 publications

(81 citation statements)

References 25 publications

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“…This approach was preferred over desorbing the in fresh 0.01 M Ca(NO3)2 solutions as any change in pH or anionic ligand (e.g. phosphate, bicarbonate) concentration could increase, or decrease, U solubility for reasons other than a simple change in U VI solution concentration [28][29][30].…”

Section: Desorption Experimentsmentioning

confidence: 99%

Kinetic study of time-dependent fixation of UVI on biochar

Ashry

Bailey

Chenery

et al. 2016

Journal of Hazardous Materials

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Biochar, a by-product from the production of biofuel and syngas by gasification, was tested as a material for adsorption and fixation of U VI from aqueous solutions. A batch experiment was conducted to study the factors that influence the adsorption and timedependent fixation on biochar at 20 o C, including pH, initial concentration of U VI and contact time. Uranium (U VI ) adsorption was highly dependent on pH but adsorption on biochar was high over a wide range of pH values, from 4.5 to 9.0, and adsorption strength was time-dependent over several days. The experimental data for pH > 7 were most effectively modelled using a Freundlich adsorption isotherm coupled to a reversible first order kinetic equation to describe the time-dependent fixation of U VI within the biochar structure. Desorption experiments showed that U VI was only sparingly desorbable from the biochar with time and isotopic dilution with 233 U VI confirmed the low, or time-dependent, lability of adsorbed 238 U VI . Below pH 7 the adsorption isotherm trend suggested precipitation, rather than true adsorption, may occur. However, across all pH values (4.5-9) measured saturation indices suggested precipitation was possible: autunite below pH 6.5 and either swartzite, liebigite or bayleyite above pH 6.5.

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Section: Desorption Experimentsmentioning

confidence: 99%

Kinetic study of time-dependent fixation of UVI on biochar

Ashry

Bailey

Chenery

et al. 2016

Journal of Hazardous Materials

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“…However, these processes frequently face technical (solubility limits vs. expected treatment levels), environmental (sludge production, loss of diluent and extractant [18]) or economic (cost vs. concentration levels) constraints that limit their application for the treatment of dilute effluents. For these reasons, in the case of low-metal concentrations, ion exchange or chelating resins are generally preferred [18,19]. Being an effective separation technique, solid-phase extraction (SPE) has risen to the forefront among the processes that have been extensively carried out in the field of separation and analysis [19,20].…”

Section: Introductionmentioning

confidence: 99%

“…For these reasons, in the case of low-metal concentrations, ion exchange or chelating resins are generally preferred [18,19]. Being an effective separation technique, solid-phase extraction (SPE) has risen to the forefront among the processes that have been extensively carried out in the field of separation and analysis [19,20]. In addition, SPE provides alternative opportunities not only for the removal of heavy metals from wastewater [1][2][3][4] but also for the recovery of precious or strategic metals [8,21], including uranium [14,19].…”

Section: Introductionmentioning

confidence: 99%

“…Being an effective separation technique, solid-phase extraction (SPE) has risen to the forefront among the processes that have been extensively carried out in the field of separation and analysis [19,20]. In addition, SPE provides alternative opportunities not only for the removal of heavy metals from wastewater [1][2][3][4] but also for the recovery of precious or strategic metals [8,21], including uranium [14,19]. SPE has a number of advantages over other processes: minimal solvent use, flexibility, high concentration factor that made the technique especially attractive for separation and removal of metal ions over the last decade [9,22].…”

Section: Introductionmentioning

confidence: 99%

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Dy(III) recovery from dilute solutions using magnetic-chitosan nano-based particles grafted with amino acids

et al. 2015

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Magnetic-chitosan nano-based particles were successfully prepared by a simple one-pot co-precipitation method before being functionalized with three different amino acid groups (i.e., alanine, serine, and cysteine) using epichlorohydrin as the linking agent. The structural and functional characteristics of the nanosorbents were investigated by elemental analysis, Fourier transform infrared spectrometer, X-ray diffraction, TEM, and vibrating sample magnetometry. The sorption properties of these materials were tested for Dy(III) recovery from aqueous solution: pH effect, uptake kinetics, and sorption isotherms were investigated. Sorbent particles are super-paramagnetic and their size is in the range of 15-40 nm. Kinetic profiles are successfully modeled with the pseudo secondorder rate equation. The Langmuir and the Dubinin-Radushkevich equations fit well-sorption isotherms. The maximum sorption capacities at pH 5 (optimum pH, and at T: 27 ± 1°C) are close to 14.8, 8.9, and 17.6 mg Dy g -1 for alanine, serine, and cysteine type, respectively. Cationic species RE(III) in aqueous solution appear to be sorbed by combined chelation and anion-exchange mechanisms. The sorption process begins at low-metal concentration by a physical monolayer sorption at low ion concentration before metal ions can be sorbed at higher metal concentration by coordination. The values of the thermodynamic parameters DG°and DH°indicate the spontaneous and endothermic nature of the mechanism, while the positive values of DS°show that during the sorption process the randomness increases. Finally, the sorbent can be efficiently regenerated using acidified thiourea: the amount of Dy(III) sorbed is hardly reduced, at least during the first four sorption/desorption cycles.

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“…Uses of chitosan on the removal of various pollutants have been adequately reviewed [5,[18][19][20][21][22][23][24].…”

mentioning

confidence: 99%

Adsorption of Chromium (VI) from Aqueous Solution Using Zeolit/Chitosan Hybrid Composite

Pang¹,

Kano²,

Inoue³

2015

JCCE

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This study investigated the adsorption ability of ZCHC (zeolite/chitosan hybrid composite) as adsorbent for chromium (Cr(VI)), ZCHC was prepared with sol-gel method by mixing zeolite and chitosan. Adsorption experiment from aqueous solutions containing known amount of Cr(VI) using zeolite, chitosan and ZCHC was explored to evaluate the efficiency of ZCHC as adsorbent for Cr in a batch system. The amount of Cr(VI) adsorbed at different pH values, initial concentrations, adsorbent dosages, and contact times were determined by ICP-AES (inductively coupled plasma-atomic emission spectrometry) in order to determine the optimum conditions for Cr(VI) adsorption. Furthermore, the adsorption mechanism of Cr(VI) by zeolite, chitosan and ZCHC was investigated by applying Langmuir and Freundlich isotherm equations to the data obtained. In addition, the rates of adsorption were found to conform to pseudo-second order kinetics.

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Adsorption of uranium (VI) from aqueous solution onto cross-linked chitosan

Cited by 333 publications

References 25 publications

Kinetic study of time-dependent fixation of UVI on biochar

Kinetic study of time-dependent fixation of UVI on biochar

Dy(III) recovery from dilute solutions using magnetic-chitosan nano-based particles grafted with amino acids

Adsorption of Chromium (VI) from Aqueous Solution Using Zeolit/Chitosan Hybrid Composite

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