Synthesis and Adsorption Performance of Surface‐Grafted Co(II)‐Imprinted Polymer for Selective Removal of Cobalt

Abstract

The surface-grafting ion-imprinting technology was applied to synthesis of a new Co(II)-imprinted polymer [Co(II)-IP], which could be used for selective removal of Co(II) from aqueous solutions. The prepared polymer was characterized by using the infrared spectra (IR), X-ray diffractometer (XRD), X-ray energy dispersion spectroscopy (EDS) and scanning electron microscopy (SEM). The maximum adsorption capacity values for the Co(II)-imprinted polymer and non-imprinted polymer (NIP) were 22 and 8 mg/g, respectively. The Freundlich equation fitted the adsorption isotherm data well. The applicability of two kinetic models including pseudo-first-order and pseudo-second-order models was estimated on the basis of comparative analysis of the corresponding rate parameters, equilibrium capacity, and correlation coefficients. Results suggested that chemical process could be the rate-limiting step in the adsorption process. And the adsorption of Co(II) on the Co(II)-imprinted polymer was endothermic. The relative selectivity coefficients of the Co(II)-imprinted polymer for Co(II)/Pb(II), Co(II)/Cu(II), Co(II)/Ni(II), Co(II)/Sr(II) and Co(II)/Cs(I) were respectively 11.5, 6.1, 13.8, 9.4, and 8.1 times greater than that of the non-imprinted polymer. Eventually, the desorption conditions of the adsorbed Co(II) from the Co(II)-imprinted polymer were also studied in batch experiments.

Study of the dynamic adsorption and the effect of the presence of different cations and anions on the adsorption of As(V) on GUT‐3

“…By exploring the influence of the height of the adsorption column, [ 32 ] solution flow rate, and the initial concentration on the dynamic adsorption of As(V), the penetration point was set as the time when C t / C 0 = 0.1 and the depletion point as the time when C t / C 0 = 0.9 (Figure 3). Our study revealed that the higher the height of the adsorption column, the higher the time taken for the breakthrough point and depletion point to be reached.…”

Selective Adsorption of Co(II) by Mesoporous Silica SBA‐15‐Supported Surface Ion Imprinted Polymer: Kinetics, Isotherms, and Thermodynamics Studies

“…The value of present work was lower than that of our previous studies (300 min). 18 With changing the concentrations of the solution from 3.0 to 8.0 mg/L, the absolute amount of Co(II) ions per unit of adsorbent increased from 2.55 to 8.50 mg/g at 25 ℃.…”

Ion-Imprinted Polymers: Synthesis, Characterization, and Adsorption of Radionuclides

“…Exposure to t isotopes causes hair loss, skin burns, anemia, and cancer [149]. Recently, IIPs have ga significant interest in removing Co²⁺ ions due to their selectivity and recognition ab The use of inorganic materials (such as palygorskite, titanate whiskers, SBA-15) gra on chitosan or polyethyleneimine, which have been crosslinked with epoxy functiona organic or silane coupling agents, for the Co-IIPs preparation, are explored in var studies [150][151][152][153]. Figure 12 presents a method used for the synthesis of IIPs from chito [154], copyright 2012, Mishad et al…”