Enhanced Selectivity for Heavy Metals Using Polyaniline-Modified Hydrogel

Abstract

With Fenton's reagent as the redox initiator, a granular hydrogel was prepared under ambient conditions, and then modified with polyaniline (PAN) to develop a composite adsorbent with enhanced adsorption selectivity for the heavy metals, such as the Cu−Ni system in this study. The results indicate that PAN-modified hydrogel shows decreasing adsorption kinetics, but with a comparable adsorption capacity for Cu(II). Moreover, the adsorption selectivity for Cu(II) exhibits an impressive improvement, with the selectivity coefficient (K Cu−Ni ) being enhanced by a factor of 6−7 (aniline:hydrogel = 1:20) for binary Cu−Ni and quaternary Cu−Ni−Cr−Zn systems. Finally, the adsorption and desorption characteristics were evaluated during multicycle adsorption processes.

Polyaniline dispersed by Kevlar fiber for uptake of organic dye

“…The chemical oxidation of aniline by ammonium persulfate as an oxidizing agent was similar to the reference reported(Zheng et al , 2012; Zheng et al , 2013). The untreated KF and KF-H were placed in appropriate volume of 1.0 mol/L HCl solution respectively, and stirred for 8 h at room temperature.…”

Recent progress in dispersion of palygorskite crystal bundles for nanocomposites

“…The conventional adsorbent prepared by solution polymerization is a bulk gel product, which requires much energy to be dried or prilled. Our groups synthesized granular 3D network adsorbent using solution polymerization (Zheng and Wang, 2012;Wang et al, 2013bWang et al, , 2013cZheng et al, 2013), which can be directly used in practice with no need of prilling. It has been proved that the disaggregation of Pal crystal bundles is extremely important to fabricate a uniform granular 3D network adsorbent.…”

Preparation and Catalysis of Pd Loaded PS/Fe3O4@PPy/Pb Magnetic Composite materials

“…Coating Fe 3 O 4 nanoparticles in a dense shell layer to form magnetic composite microspheres with a core-shell structure is one of the effective methods to solve this problem. In this study, Fe 3 O 4 particles were prepared by the chemical co-precipitation method, and PS/Fe 3 O 4 nanocomposite particles were used as seeds [14][15][16] . The PPy nanocomposite was successfully deposited on the surface of the seed particles by the reaction of pyrrole polymerization.…”