In situ immobilization on the silica gel surface and adsorption capacity of polymer-based azobenzene on toxic metal ions

Abstract

In situ immobilization of poly[(4-methacryloyloxy-(4′-carboxy)azobenzene] on silica gel surface has been performed by radical polymerization of monomer. The fact of polymer immobilization is confirmed by IR spectroscopy. TG and DSC-MS analysis showed that the mass of the immobilized polymer was 10.61%. The SEM-microphotograph-synthesized composite analysis showed that the immobilized polymer on the silica gel surface is placed in the form of fibers. It has been found that the synthesized composite exhibits the sorption ability in terms of microquantities of Cu(II), Cd(II), Pb(II), Mn(II) and Fe(III) ions in a neutral aqueous medium. The quantitative sorption of microquantities of Pb(II) and Fe(III) ions has been recorded. It has been found that immobilization of the silica gel surface leads to an increase in its sorption capacitance for Fe(III), Cu(II) and Pb(II) ions by half. Keywords Poly[(4-methacroyloxy-(4′-carboxy)azobenzene] • Modified silica • In situ immobilization • Adsorption properties • Composite • In situ immobilization • Heavy metals Abbreviations AIBN 2,2′-azobisisobutyronitrile THF tetrahydrofuran IR infrared spectroscopy TG thermogravimetry DSC-MS differential scanning calorimetry-mass spectrometry DTA differential thermal analysis * Irina Savchenko

Wood Polymer Composite Based on a Styrene and Triethoxy(Vinylphenethyl)silane

“…Recently, adsorption has been widely utilized to remove heavy metals from aqueous solutions due to its many advantages, such as low cost, easy handling, high removal efficiency, and environmental friendliness. [1][2][3] There are a lot of materials, including polymer-modified silica gel, [4][5][6][7] carbon nanocomposites, 8 magnetic nanoparticles (Fe 3 O 4 ), 9 fibers, 10 and modified natural clays 11,12 that have been used as adsorbents to remove heavy metals from aqueous solutions.…”