Efficient removal of hexavalent chromium and lead from aqueous solutions by s‐triazine containing nanoporous polyamide

Abstract

s‐Triazine containing dicarboxylic acid was synthesized. Then, it was reacted with 1,3‐phenylenediamine in molten tetrabutylammonium bromide to formed soluble aromatic polyamide with good yield and moderate inherent viscosity of 0.35 dL g−1. The solubility and flexibility of polyamides are low. So, we used ether group such as di(4‐aminephenyl) ether in building polyamide. The structure of monomer and polymer was confirmed by Fourier transform infrared spectroscopy, elemental analysis, and proton nuclear magnetic resonance techniques. Thermogravimetric analysis was used to evaluate the thermal properties of synthesized polyamide, and their results show that this polymer had a good thermal stability. The surface morphology of s‐triazine containing polyamide was studied by field emission‐scanning electron microscopy and transmission electron microscopy, and the results show that it has a porous morphology and moderate Brunauer–Emmett–Teller specific surface (367 m2 g−1). It was further investigated for Pb (II) and Cr(VI) ion removal by optimizing the parameters including pH and contact time. The maximum uptakes of Pb(II) and Cr(VI) at pH 5.0 and pH 4.0 are 57% and 76%, respectively. Also, sorption kinetics of this polymer was investigated. Copyright © 2017 John Wiley & Sons, Ltd.

Synthesis of polyamide 6/nano-hydroxyapatite hybrid (PA6/n-HAp) for the sorption of rare earth elements and uranium

“…These materials have been also frequently designed as composite by incorporation of silica [40], clays [41,42], carbon [43] or biomass [44] to (a) improve specific surface area, (b) change hydrophilic/hydrophobic characteristics and (c) enhance sorption performance. The functionalization of polyamide-based materials has been also used for improving metal sorption [45][46][47][48].…”

High Surface Area Nano‐Boehmite as Effective Nano‐Filler for Preparation of Boehmite‐Polyamide‐6 Nanocomposites

“…In addition, other fillers like, KIT‐6 (Korea Advanced Institute of Science and Technology no.6), FDU‐15 (Fudan University), SBA‐15 (Santa Barbara no.15. ), and boehmites were used by other research groups.…”

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A structurally engineered flower shaped magnetic hierarchical sorbent for rapid and selective uptake of Pb2+ ions from water samples

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