Adsorption of Ni(II) ion on Ni(II) ion-imprinted magnetic chitosan/poly(vinyl alcohol) composite

Abstract

Magnetic chitosan/poly(vinyl alcohol)/Ni(II) beads (m-CTS/PVA/Ni(II)s) were prepared by blending CTS, PVA, Ni(II), and Fe 3 O 4 . Ni(II)-imprinted m-CTS/PVA beads (Ni(II)-IMCPs) were obtained by eluting Ni(II) ions from the m-CTS/PVA/Ni(II)s. The optimal conditions for preparing Ni(II)-IMCPs are 2.0 % (w/w) for CTS, 1.5 % (w/w) for PVA, 0.8 % (w/w) for Ni (NO 3 ) 2 , and 2.0 % (w/w) for Fe 3 O 4 . The Fourier transform infrared spectroscopy (FT-IR) analysis implies that the coordinating atoms may be N atom of -NH 2 in chitosan and O atom of -OH in poly(vinyl alcohol). The X-ray diffraction (XRD) patterns indicate that there are the Fe 3 O 4 characteristic diffraction peaks and the decrease of the crystallinity for CTS. The study on the adsorptive performances of Ni(II)-IMCPs shows that the process of adsorption is good fitted to Langmuir model and the maximum adsorption capacity of Ni(II)-IMCPs for Ni(II) ions is 500.0 mg g −1 (conditions: V=20 mL, m=0.050 g, contact time=6 h, at 25°C). Kinetic models were used for interpreting data obtained from batch experiments, which show that the whole adsorption processes for Ni(II) ions on Ni(II)-IMCPs are in accordance with pseudo-second-order kinetic equation. The study of repeating and selective adsorption indicates that Ni(II)-IMCPs have good durability and selectivity for Ni(II) ions.

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

“…19 To date, a lot of Ni(II) ion-imprinted polymers based on biomass have been prepared by surface imprinting technique for removal of nickel(II) from aqueous solution. [20][21][22][23][24] Silica gel has been widely applied as a support for surface imprinting materials due to its low cost, wonderful modication and excellent mechanical stability. 25 However, to our knowledge, there is only one literature on Ni(II) ion surfaceimprinted polymer based on silica gel functionalized with amino group for selective removal of Ni(II) from aqueous solutions.…”

Ion-Imprinted Polymeric Materials for Selective Adsorption of Heavy Metal Ions from Aqueous Solution

“…Consequently, its removal is highly demanded. Thus, several Ni(II)-imprinted materials have been prepared [ 101 , 102 , 103 , 104 , 105 , 106 , 107 , 108 , 109 , 110 , 111 , 112 ] ( Table 4 ).…”

“…Magnetic CS/PVA beads, having improved adsorption capacity and selectivity for Ni(II) ions, have also been fabricated [ 103 ]. The maximum equilibrium adsorption capacity was reached within 6 h and the magnetic CS/PVA beads absorbed about 500 mg Ni(II)/g, at 298 K. In column experiments, the magnetic CS/PVA beads exhibited selectivity for Ni(II) recovery from multi-HMIs wastewater.…”

Research Progress on Wastewater Treatment by Heavy Metal Ion Imprinted Polymer

“…The removal of trace cobalt and other impurities from high purity nickel has become the key to improve the quality of high purity nickel. Zhang et al [21] have prepared a magnetic chitosan/poly(vinyl alcohol)/Ni(Ⅱ) beads by blending CTS, PVA, Ni(Ⅱ), and Fe 3 O 4 . Ni(II)-imprinted m-CTS/PVA beads (Ni(II)-IMCPs) were obtained by eluting Ni(II) ions from the m-CTS/PVA/Ni(II)s. The study on the adsorptive performances of Ni(II)-IMCPs showed that the process of adsorption is good fitted to Langmuir model and the maximum adsorption capacity of Ni(II)-IMCPs for Ni(II) ions is 500.00 [mg.g −1 ].…”