Facile preparation of a silica‐sphere–poly(catechol hexamethylenediamine) composite for the competitive removal of cadmium(II), lead(II), and copper(II) ions

Abstract

A silica‐sphere–poly(catechol hexamethylenediamine) (PCHA–SiO2) composite was prepared via the one‐step facile polymerization of catechol and hexamethylenediamine; this method uses a silica sphere as a hard template. The chemical structures and morphologies of this composite were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, and transmission electron microscopy. The adsorption experiments indicated that the PCHA–SiO2 composite served as a very attractive adsorbent for Pb(II)‐, Cu(II)‐, and Cd(II)‐ion removal at lower concentrations and had very good selective adsorption abilities for Pb(II) and Cu(II) ions in a solution contaminated with these three ions at higher concentrations. These interesting results may have been due to the reversible H+ adsorption–desorption properties of the characteristic phenol amine structure of the PCHA–SiO2 composite. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45839.

Design and Implementation of Dynamic Time History Analysis in Building Structure CAD

“…Russo D [5] combines the principles of ecological innovation with design methods based on structural optimization tools to create a knowledgeable CAE process that links CAD, FEM, optimization tools and LCA-based tools. Wei G [6] characterized the chemical structure and morphology of the composite by Fourier transform infrared spectroscopy, thermogravimetric analysis and transmission electron microscopy. Li L [7] proposed a closed-loop recognition algorithm (CLR), multi-closed-loop intelligent identification (MCLR) algorithm and multi-closed-loop matching (MCLM) algorithm based on feature recognition, which realized the automatic generation of regular surfaces in the flow channel.…”