Preparation of iminodiacetic acid‐type composite chelating material IDAA‐PGMA/SiO₂ and preliminary studies on adsorption behavior of heavy metal ions and rare earth ions

Abstract

A kind of iminodiacetic acid (IDAA)‐type composite chelating materials was prepared by first graft polymerization and subsequent polymer reaction. Monomer glycidyl methacrylate (GMA) was grafted on micron‐sized silica gel particles in the manner of “graft through” in a solution polymerization system, resulting in the grafted particles poly(glycidyl methacrylate) (PGMA)/silicon dioxide (SiO2). Subsequently, the ring‐opening reaction of the epoxy groups of the grafted PGMA was carried out with IDAA as reaction reagent, resulting in the bonding of IDAA groups onto PGMA/SiO2 and obtaining the composite chelating material IDAA‐PGMA/SiO2 particles. The effects of the main factors on the graft polymerization of GMA and the bonding reaction of IDAA were examined emphatically, and the adsorption behavior of IDAA‐PGMA/SiO2 particles toward several kinds of heavy metal ions and rare earth ions was preliminarily explored. The experiments results show that: (a) to obtain the grafted particles PGMA/SiO2 with high grafting degree, in the graft polymerization step, the reaction temperature and the used amount of initiator should be controlled. The suitable temperature is 70°C and the appropriate used amount of initiator is 1.4 % of the monomer mass. Under the optimal conditions, the grafted degree of PGMA can reach 17.50 g/100 g. (b) It is feasible to introducing of IDAA groups onto PGMA/SiO2 particles via ring‐opening reaction of epoxy groups of the grafted PGMA under alkaline conditions, and the bonding rate of IDAA group can get up to 70% based on epoxy groups of the grafted PGMA. (c)The composite chelating material IDAA‐PGMA/SiO2 possesses very strong chelating adsorption ability for heavy metal ions, and especially toward Pb2+ ion, the adsorption capacity can reach 24 g/100 g. (d) The adsorption ability of IDAA‐PGMA/SiO2 for rare earth ions is weaker than that for heavy metal ions. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

Adsorption of Cu(II), Ni(II) and Pb(II) ions onto polyamine-polyurea polymer modified with pyromellitic dianhydride: kinetic, isotherm and thermodynamic studies

“…The efforts to increase the efficiency of adsorption mean that researchers have aimed to create a new material that has high complexation potential with heavy metals [16]. The superiorities of chelating polymers to adsorb heavy metals are their ease of use and the fact that they can be repeatedly used, along their high adsorption capacity and selectivity [13,17]. In the literature, there are numerous reports where chelating polymers have been used to remove and recover heavy metal ions from wastewater [18][19][20][21][22].…”

“…Amongst these techniques, the fact that it can be applied in low concentrations makes adsorption preferable for the removal of heavy metals. Adsorption is an effective and simple method, but the effectiveness of the method substantially depends on the choice of adsorbent [13].…”

Grafting of poly[styrene‐co‐N‐(4‐vinylbenzyl)‐N,N‐diethylamine] polymer film onto the surface of silica microspheres and their application as an effective sorbent for lead ions

“…As shown in Table , the adsorption capacity of the silica@polymer sorbents are comparable with some of sorbents reported in the literature such as poly(AGE/IDA‐ co ‐DMAA)‐ grafted ‐silica gel and EDTA‐modified chitosan/SiO 2 /Fe 3 O 4 adsorbents . While the adsorption equilibrium time for silica@polymer sorbents was shorter than that of IDAA‐PGMA/silica gel sorbent . This might ascribed to that the present silica@polymer sorbent possessed the well‐defined structure and the relatively thin chelating polymer film which endowed the chelating polymer/silica composites with large surface area and easy accessibility for Pb 2+ ions.…”

“…Chelating resins with ligand such as amino, carboxyl, iminoacetate, Schiffbase, aminophosphonate, 8‐hydroxyquinoline, amidoxime, and so on, have been recognized as efficient adsorption sorbents for the removal of heavy metal ions from aqueous medium due to their high adsorption capacity and excellent selectivity. However, the relative low mechanical and thermal stability, acid/base corrosion and eventually the chelating group embedding inside the bulk resins greatly restrain their adsorption performance such as long adsorption equilibrium time and bad recycle ability .…”

“…Panahi et al reported the surface grafting of polymer containing a functional monomer for metal chelating, poly[1‐( N , N ‐bis‐carboxymethyl)amino‐3‐allylglycerol‐ co ‐dimethylacrylamide] onto silica gel modified by silylation with 3‐mercaptopropyltrimethoxysilane . Gao et al have successfully grafted poly(glycidylmethacrylate) (PGMA) onto the surface of 3‐(methacryloxy)propyltrimethoxysilane functionalized silica gel and the epoxy groups within the PGMA was subsequently reacted with iminodiacetic acid to obtain amino functionalized chelating polymer/silica composites . Sun et al have prepared chelating polymer/silica composites by grafting of PGMA onto the surface of silica microspheres and followed the modification of the epoxy groups by dimethylamine .…”