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

Abstract

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.

Synthesis and adsorption characteristics of grafted hydrazinyl amine magnetite-chitosan for Ni(II) and Pb(II) recovery

“…This is this one-pot synthesis procedure that was selected for preparing the composite magnetic chitosan material used in the present work [23]. In order to improve sorption properties many different reactive groups have been used for decorating the biopolymer including EDTA and analogues [24], amino-acids [25], amidoxime [26,27], aminophosphonate [28], sulfur compound [29], etc. In a previous work a magnetic sorbent was prepared by functionalization of chitosan magnetic particles [30]: a hydrazide derivative was immobilized on glycine-ester functionalities and the sorbent was successfully tested for the sorption of uranyl, copper and zinc ions from synthetic pure or binary solutions; the present work use this sorbent for investigating the recovery of Ni(II) and Pb(II) before testing the treatment of synthetic complex solution and real contaminated effluent.…”

A comparative study on the adsorption of 8-amino-1-naphthol-3,6-disulfonic acid by a macroporous amination resin

“…However, there is few literature about the adsorption of H-acid onto adsorbents, while the cost-effective adsorption technology for the industrial wastewater has been widely applied in many countries all over the world [5][6][7][8][9]. Previous researchers have made many efforts to deal with wastewater using various adsorbents, including resins, chitosan, and silica [10][11][12][13]. The adsorbents can be designed with binding sites with high selectivity and regenerated effectively, which could decrease the cost of the treatment and allow the process to be continuous.…”

Carbon Nanofibers: A New Adsorbent for Copper Removal from Wastewater

“…The ∆S • value is positive, which indicates an increase in the randomness in the CNF/Cu 2+ system. In the temperature range studied, the ∆H • is lower than T·∆S • , so the sorption process was dominated by entropic rather than enthalpic changes [51,62].…”

“…When the pH value is lower than the isoelectronic point, the sorbent surface has a positive charge, and a negative charge when the pH is greater than 1.9 [37,51]. The surface charge could affect in the adsorption properties of the adsorbent [51]. The isoelectric point (IEP) of CNF is obtained at a pH value of 1.9 (Figure 2).…”