Synthesis of ion‐imprinting chitosan/PVA crosslinked membrane for selective removal of Ag(I)

Abstract

A novel ion‐imprinted membranes were synthesized for selective removal and preconentration for Ag(I) ions from aqueous solutions. The membranes were obtained via crosslinking of chitosan (CS), PVA, and blend chitosan/PVA using glutaraldehyde (GA) as crosslinker. The FTIR spectra were used to confirm the membrane formation. Comparing with the nonimprinted membranes, Ag(I)‐imprinted CS and CS/PVA has higher removal capacity and selectivity for Ag+ ions. An enhancement in the Ag+ removal capacity by ∼ 20% (from 77.8 to 94.4 mg g–1) and ∼ 50% (from 83.9 to 125 mg g–1) was found in the Ag(I)‐imprinted CS and Ag(I)‐imprinted CS/PVA membranes, respectively, when compared with the nonimprinted membranes. Removal equilibra was achieved in about 40 min for the non‐ and ion‐imprinted CS/PVA. The pH and temperature significantly affected the removal capacity of ion‐imprinted membrane. The relative selectivity coefficient values of Ag+/Cu2+ and Ag+/Ni2+ are 9 and 10.7 for ion‐imprinted CS membrane and 11.1 and 15 for ion‐imprinted CS/PVA membrane when compared with nonimprinted membranes. The imprinted membranes can be easily regenerated by 0.01M EDTA and therefore can be reused at least five times with only 15% loss of removal capacity. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009

Kinetics Adsorption of Silver Ion by Blend Chitosan-Polyvinyl Alcohol Resin

“…Similar trend has also been reported by chromium (VI) adsorption onto sawdust [8]. The adsorption of silver ion onto blend chitosan-polyvinyl alcohol resin occurred due to free lone pairs electrons on the amino nitrogen are suitable for coordination with silver ion to give the corresponding adsorbent-metal complex [9]. The adsorption capacity of silver from photography wastewater by blend chitosan-polyvinyl alcohol resin was 4.3 mg/g.…”

“…6, No. 9, September 2015 To compute Bt, (8) is substituted by (7) and the kinetic expression becomes (9). (9) Thus, the value of Bt can be computed for each value of F, and then plotted against time.…”

“…9, September 2015 To compute Bt, (8) is substituted by (7) and the kinetic expression becomes (9). (9) Thus, the value of Bt can be computed for each value of F, and then plotted against time. Linearity of this plot is employed to distinguish between external-transport (film diffusion) and intraparticle transport controlled rates of sorption.…”

Adsorption of Zinc and Lead Ions from Aqueous Solutions Using Chitosan/Polyvinyl Alcohol Membrane Incorporated via Acid-Functionalized Carbon Nanotubes

“…The prepared adsorptive membranes (CS/PVA-CNTs) were added to the aqueous solutions containing different concentrations of heavy metal ions (Zn(II) and Pb(II)) (50, 150, 300, 500, 700, 900 and 1100 mg/L). The equal membrane to solution ratio was maintained in all the experiments (1 g/L) [26][27][28][29]. The mixture was stirred (150 rpm) for 7 h at 25 °C.…”

Molecularly Imprinted Membranes

“…Ion imprinting for the cross-linked CS adsorbent proposed by Shawky et al [86] overcame this problem. The aforesaid authors used Ag Another study involving CS was proposed by Wang et al [87], however, in this work, CS was used blended with PVA, in order to obtain a film-forming material, the metal ion-imprinted membrane (IIM) was prepared using silver ions as templates (Ag (I)-IIM).…”