Lead(II)‐ion removal by ethylenediaminetetraacetic acid ligand functionalized magnetic chitosan–aluminum oxide–iron oxide nanoadsorbents and microadsorbents: Equilibrium, kinetics, and thermodynamics

Abstract

Novel nanosized and microsized chitosan–Al2O3–Fe3O4 (CANF and CAMF, respectively) adsorbents were functionalized with ethylenediaminetetraacetic acid (EDTA) ligands and applied to the removal of Pb(II) ions. The prepared adsorbents were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, and Brunauer–Emmett–Teller analysis, and their adsorption potentials were investigated with Pb(II) as a target metal under various experimental conditions. Our results show that the EDTA functionalization of CANF and CAMF increased their adsorption capacities about 31.5 and 38 times, respectively. The optimum dosage obtained was 1.0 g/L for both EDTA‐functionalized adsorbents, and the maximum adsorption took place at pH = 5.3. The kinetic results revealed that the adsorption obeyed the pseudo‐second‐order model and that the pore diffusion process played a key role in the adsorption kinetics. Also, the results of equilibrium isotherms indicate the good fit of the experimental data by the Langmuir isotherm model under the studied concentration and temperature ranges, and the adsorptions of Pb(II) ions from aqueous solution followed the monolayer coverage of the adsorbents. The maximum Pb(II)‐ion adsorption capacities of EDTA–CANF and EDTA–CAMF were 160 and 157 mg/g, respectively. These metal‐loaded adsorbents could be readily recovered from aqueous solution by magnetic separation and reused. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44360.

Response surface methodology approach for optimization of methyl orange adsorptive removal by magnetic chitosan nanocomposite

“…The intrinsic characteristics of chitosan, such as its availability, non-toxicity, biocompatibility, and reactivity, make it a widely used material in the chemical, environmental, pharmaceutical, food, and medical fields [2,3]. Chitosan and its derivatives are among the most low cost and plentiful biopolymer adsorbents and have attracted significant interest for the removal of organic and inorganic pollutants from waste water [4][5][6][7][8][9][10] due to their outstanding chelating behavior [11,12].…”

“…To overcome this problem, recent research has focused on magnetic chitosan composites to apply magnetic separation technology [9,14]. The magnetic separation technique is low cost, rapid, convenient, and amenable to automated methods [15,16], and the magnetic composites can be easily separated from the medium by a simple magnetic field [13,17].…”

Neuro-fuzzy modeling to adsorptive performance of magnetic chitosan nanocomposite

“…For instance, several magnetic chitosan composites such as chitosan/Fe 3 O 4 [14][15][16], chitosan/Al 2 O 3 / Fe 3 O 4 [17,18], polyoxometalate-grafted chitosan/Fe 3 O 4 [19] and magnetic graphene/chitosan [8] have been reported as efficient adsorbent composites for the removal of organic pollutants. Also, Zhao et al [15,20], Ayati et al [21], Ren et al [22] and Yang et al [23] used the magnetic chitosan composites for the adsorption of different metal ions adsorption as well as Reddy et al [24] and Vakili et al [10] who studied the adsorption performance of magnetic chitosan composites for metal and dyes removal from aqueous solutions. The works in the literature have been mostly focused on the synthesis and adsorption mechanism and highlighted the effective parameters on the adsorption capacity of these composites.…”

Synthesis of Ethylenediaminetetraacetic Acid-Functionalized Chitosan Cryogels as Potential Sorbents of Heavy Metal Ions

“…As can be seen from Figure 5D, the sorption capacity and removal efficiency of CS-EDTA cryobeads were preserved almost constant even after the 10 th cycle of sorption/desorption, displaying their extraordinary chemical structure stability. [21,25,28], Ni(II) [22,23], and Co(II) [23], or for the chromatographic separation of rare earths [24]. The usage of water soluble EDTA-linked CS as a flocculant for Cu(II) ions has been also evaluated [27].…”

“…For instance, functionalization with amidoxime [16][17][18], thiosemicarbazide [19], thiourea [20], aminopolycarboxylic acid (APCAs) [21][22][23][24][25][26][27][28], thymine [10], polydopamine [29], and aminophosphonate [30] moieties allowed designing of CS derivatives with targeted selectivity for various HMIs. The amidoxime-functionalized CS was used for removal and recovery of uranium [16,17], APCAs-functionalized CS derivatives were studied for the uptake and recovery of lead [21,25,28], nickel [22,23], cobalt [23], rare earths [24], or copper [27], while polydopamine-modified CS was efficient for removal of chromium(VI) and organic dyes [29]. APCAsfunctionalized CS derivatives have been also investigated as a stationary phase in liquid chromatography for the separation of HMIs mixtures [22,24].…”