Preparation and application of Ni(<scp>ii</scp>) ion-imprinted silica gel polymer for selective separation of Ni(<scp>ii</scp>) from aqueous solution

“…The data fitted the pseudo-second order kinetics model better. Generally, for the pseudosecond order model, the rate-limiting step is the surface adsorption that involves chemisorption, where the removal from a solution was due to physicochemical interaction between two phases [42].…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Adsorption of Heavy Metal on Active Carbon Derived from Coconut Leaves Agro-Waste

Jadhav¹,

Mohanraj²,

Mayadevi³

et al. 2020

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In this paper activated carbon is prepared from coconut leaves by chemical activation during slow pyrolysis at 673 K in an inert atmosphere. Activated carbon is prepared in the stiochiometric ratio of 1:1 (CL1), 2:1 (CL2) and 3:1 (CL3). Optimized 3:1 ratio is preferable for further study. BET surface area of CL3 activated carbon was found 1060.57 m2/g. It is greater than those of CL1 and CL2. The batch sorption study experiments were conducted with respect to solute concentration of 2.5–122.8 mg/l and solution temperature of 313–343 K. The Langmuir, Freundlich and Temkin isotherm studies were conducted. The experimental data fitted very well for the pseudo-first order and pseudo-second-order. The results have established good potentiality for the CL3 activated carbon to be used as a sorbent for the removal of lead from wastewater.

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“…1,5,10 Feng et al prepared a silica gel-based polymer for separation of nickel ions with a capacity of 20.30 mg g −1 . 11 Dahaghin et al synthesized magnetic nanoparticle-based IIP for Pb(II) and reported a capacity of 83 mg g −1 . 12 Ren et al synthesized graphene oxide (GO)-based IIPs for Cu removal with 132 mg g −1 capacity.…”

Section: ■ Introductionmentioning

confidence: 99%

Triethylenetetramine-Grafted Magnetite Graphene Oxide-Based Surface-Imprinted Polymer for the Adsorption of Ni(II) in Food Samples

et al. 2020

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In this work, a hydrophilic sandwich-like graphene oxide (GO) ion-imprinted polymer (IIP) was synthesized via the surface imprinting technique to develop a dispersive magnetic solid-phase extraction method for the preconcentration of Ni(II) by flame atomic absorption spectrometry (FAAS). In this imprinted polymer, allyl-rich amines (monomer) and ethylene glycol dimethacrylate (EGDMA) (cross-linker) act as platforms for Ni(II) recognition. Most importantly, the influence of other transition metals as well as alkali/alkaline earth metals in the samples was evaluated to compare the imprinting effect between IIP and nonimprinted polymer (NIP) as a control. The IIP for Ni(II) in a binary mixture provides >99% recovery with a good selectivity coefficient, whereas NIP could not recognize a specific metal ion from competitive ions due to the absence of imprinting effect. Moreover, the introduced specific binding sites with complementary shapes and sizes for Ni(II) recognition in IIP exhibited high adsorption capacity as compared to NIP and fast chemical kinetics with a pseudo-second-order model. The ease of separation from aqueous solutions by an external magnet is facilitated due to embedded Fe 3 O 4 nanoparticles. By utilizing nonlinearized isotherm modeling, two-parameter models (Langmuir, Freundlich, and Dubinin−Radushkevich) and three-parameter models (Redlich− Peterson and Sips) were analyzed with error analysis (reduced χ 2 , residual root-mean-square error (RMSE), and sum squares error (SSE)). Additionally, the structural modifications of GO were examined by Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), and atomic force microscopy (AFM). No significant difference was found in FTIR spectra of IIP and NIP. Accuracy was presented by SRM and recovery studies. The synthesized sorbent possesses high recognition ability even after seven regeneration cycles, illustrating potential applications for Ni(II) determination in various food and water samples.

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Preparation and application of Ni(ii) ion-imprinted silica gel polymer for selective separation of Ni(ii) from aqueous solution

Cited by 40 publications

References 38 publications

A comprehensive review on the decontamination of lead(ii) from water and wastewater by low-cost biosorbents

A comprehensive review on the decontamination of lead(ii) from water and wastewater by low-cost biosorbents

Adsorption of Heavy Metal on Active Carbon Derived from Coconut Leaves Agro-Waste

Triethylenetetramine-Grafted Magnetite Graphene Oxide-Based Surface-Imprinted Polymer for the Adsorption of Ni(II) in Food Samples

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