Syntheses, Characterization, and Hg(II) Adsorption Properties of Porous Cross-Linked Polystyrene Modified with 2-Aminopyridine via a Sulfoxide/Sulfone-Containing Spacer Arm

Abstract

Two chelating resins, porous cross-linked polystyrene modified with 2-amino-pyridine via a sulfoxide/ sulfone-containing spacer (PVBSO-AP and PVBSO 2 -AP), were synthesized. Their structures were characterized by a Fourier transform infrared spectrometer (FTIR), scanning electron microscopy (SEM), porous structure analysis, and elementary analysis. The results of SEM and pore analysis demonstrated that the two kinds of chelating resins maintained meso-macro porous structures. Some factors affecting the adsorption of Hg(II) on PVBSO-AP and PVBSO 2 -AP resins such as contact time, solution concentration, and pH were investigated. The results showed that the optimum pH ranges appeared at (4.0 to 5.0) for PVBSO-AP and at (3.0 to 6.0) for PVBSO 2 -AP resin, and the times reaching equilibrium were (8 and 5) h for the two resins, respectively. The experimental equilibrium data of Hg(II) onto the two resins showed that linear Langmuir and nonlinear Redlich-Peterson isotherms were the best fitting isotherms to describe the experimental data. The selectivity of adsorption of Hg(II) on PVBSO-AP and PVBSO 2 -AP resins for Hg(II) were investigated in the binary ion systems. The results showed that the two resins can adsorb selectively Hg(II) in the presence of Ni(II), Zn(II), and Pb(II), and three adsorption-desorption cycles demonstrated that the two resins are suitable for reuse without considerable changes in the adsorption capacity. † Part of the "Sir John S. Rowlinson Festschrift".

High‐efficiency recovery of rare earth ions by hydrolyzed poly(styrene‐co‐maleic anhydride)

“…The scanning electron microscopy (SEM) images were taken with a field-emission scanning electron microscope (JEOLJSM-6701F). The metal ions (RE 31 , Ca 21 , and Mg 21 ) in solution were determined by inductively coupled plasma atomic emission spectrometry (POEMSI, Thermo Jarrell Ash Corp). The concentrations of RE 31 in solution were measured in a JASCO UV-Vis (model V-530) spectrophotometer.…”

“…Specifically, polymeric adsorbent are widely used in modern adsorption separation technology due to their favorable physicochemical stability, large adsorption capacity, excellent selectivity, and structural diversity. 20,21 For instance, poly(acrylamide-expanded perlite), a novel composite, was synthesized for the enrichment of Tb(III) ions, 22 and magnetic nanocomposite hydrogel with ZnO-initiated photopolymerization adsorbed La(III) ions. 23 In our previous work, we have reported the synthesis of macromolecular metal complexes (MMC) containing thorium with polymeric ligands, and this process can be used for recovery radioactive element Th.…”

“…large amount of wastewater containing low content rare earth elements and light metals (such as Ca 21 and Mg 21 ) was produced. Our study aims to recover the highly valuable and potentially harmful rare earth under competitive conditions.…”

“…They are attributed to monosubstituted benzene ring CAH stretching vibration. 33 A strong and wide band appears around 3434 and 3420 cm 21 (for PSMA, PSMA-Na and PSMA-RE, respectively), which is assigned to the OAH stretching vibrations of the moisture from the polymer network. ).…”

“…This indicates that the carboxylic groups is a bidentate ligand coordinated to the RE 31 . 35 Two bands of PSMA appear at 1856 and 1779 cm 21 , which almost disappeared in the complexes (PSMA-RE) due to hydrolysis of anhydride. The results indicated that rare earths ions have been combined with the PSMA resin.…”