Kinetic and equilibrium characterization of uranium(VI) adsorption onto carboxylate-functionalized poly(hydroxyethylmethacrylate)-grafted lignocellulosics

Peanut shell (PNS) was used to prepare a novel adsorbent to achieve resource recovery of the agricultural residue. The hydroxyl groups of peanut shell were turned into -C(CH 3 ) 2 -Br pendant groups to initiate polymerization of acrylonitrile. Graft copolymer peanut shell/polyacrylonitrile (PNS-g-PAN) was modified by hydroxylamine hydrochloride to transform the cyano groups into amidoxime (AO) groups. The modified copolymer of AO-PNS-g-PAN was used as adsorbent. The maximum adsorption capacity for Hg(II) was 4.45 mmol g -1 . The adsorption process fitted well the Freundlich isotherm model and followed pseudo-second-order model. The modified copolymer demonstrated its potential as an efficient adsorbent to solve the problem of Hg(II) contamination. Graphical abstract The peanut shell (PNS) macroinitiator was obtained by acylation of hydroxyl groups on the cellulose backbone of the peanut shell and initiated by Cu(0)-mediated RDRP of acrylonitrile. PNS-g-PAN was modified by NH 2 OHÁHCl and used to remove heavy metal ions. The maximum adsorption capacity of Hg(II) was 4.45 mmol g -1 .

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“…2b. The results indicated a decrease in the crystalline nature of peanut shell structure, which was beneficial to the acylation process [25].…”

Section: Pretreatment Of Peanut Shellmentioning

confidence: 96%

Synthesis of peanut shell/polyacrylonitrile copolymer via Cu(0)-mediated RDRP and its adsorption behavior after modification

et al. 2015

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“…The calculated value of E a can also be used to determine ion exchange control step [22]. The ion exchange process is controlled by film diffusion at E a < 16.0 kJ/mol.…”

Section: Mass Transfer Mechanismmentioning

confidence: 99%

Ion Exchange Adsorption Kinetics of Miglitol by D001 Resins

Zhang¹,

Ren²,

Wang³

et al. 2017

ACES

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In order to explore internal factors for adsorption kinetic effect of miglitol by D001 resin, a batch adsorption operation for miglitol kinetic adsorption at different concentrations, temperatures and vibrating rates was investigated in oscillator (SHZ-A), respectively. The different kinetic mathematical model, Webber-Morris kinetic equation, film diffusion coefficient equation and kinetic boundary model were all applied to discuss the adsorption process. The results showed that Type 1 pseudo-second order kinetic equation can be all used to describe miglitol adsorbed by D001 resin at different concentrations, temperatures and vibrating rates. Moreover, the total activation energy (Ea) can be calculated and its value is 9.7 kJ/mol, and then calculated values of the process film diffusion coefficient and pore diffusion coefficient, it may be inferred from these gotten values that the ion exchange process is all mainly controlled by film diffusion. Therefore, the results also suggest that the external adsorption factors such as solute concentration, temperature and vibrating rate for effect of mass transfer diffusion process control of miglitol onto D001 resin are relatively weak.

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“…The thermodynamic parameters such as the change of Gibbs free energy, enthalpy and entropy of adsorption Table 1 The kinetic parameters of HCC and HCC-TPP Adsorbents q e,exp (mg g -1 ) Pseudo-first-order kinetic Pseudo-second-order kinetic q 1,cal (mg g -1 ) k 1 (min -1 ) R 2 q 2,cal (mg g -1 ) k 2 (g mg -1 min -1 ) process can be calculated using the following equation [38]:…”

Section: Adsorption Thermodynamicsmentioning

confidence: 99%

Removal of U(VI) from aqueous media by hydrothermal cross-linking chitosan with phosphate group

Dong

Qiu

Dai

et al. 2016

J Radioanal Nucl Chem

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For the selective adsorption of U(VI) from aqueous solutions, the hydrothermal cross-linking chitosan (HCC) and its phosphorylation production (HCC-TPP) were synthesized by hydrothermal reaction. The monolayer maximum capacity of HCC-TPP was improved from 200 mg g -1 of HCC to 409.2 mg g -1 at 298 K. Calculated thermodynamic parameters showed endothermic property of the adsorption process, while kinetic parameters indicated that the interaction followed pseudo-second kinetic model. Selective separation of U(VI) from effluent by HCC-TPP was achieved.

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Kinetic and equilibrium characterization of uranium(VI) adsorption onto carboxylate-functionalized poly(hydroxyethylmethacrylate)-grafted lignocellulosics

Cited by 94 publications

References 44 publications

Synthesis of peanut shell/polyacrylonitrile copolymer via Cu(0)-mediated RDRP and its adsorption behavior after modification

Synthesis of peanut shell/polyacrylonitrile copolymer via Cu(0)-mediated RDRP and its adsorption behavior after modification

Ion Exchange Adsorption Kinetics of Miglitol by D001 Resins

Removal of U(VI) from aqueous media by hydrothermal cross-linking chitosan with phosphate group

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