Methacrylate-Based Polymeric Sorbents for Recovery of Metals from Aqueous Solutions

Abstract

The industrialization and urbanization expansion have increased the demand for precious and rare earth elements (REEs). In addition, environmental concerns regarding the toxic effects of heavy metals on living organisms imposed an urgent need for efficient methods for their removal from wastewaters and aqueous solutions. The most efficient technique for metal ions removal from wastewaters is adsorption due to its reversibility and high efficiency. Numerous adsorbents were mentioned as possible metal ions adsorbents in the literature. Chelating polymer ligands (CPLs) with adaptable surface chemistry, high affinity towards targeted metal ions, high capacity, fast kinetics, chemically stable, and reusable are especially attractive. This review is focused on methacrylate-based magnetic and non-magnetic porous sorbents. Special attention was devoted to amino-modified glycidyl methacrylate (GMA) copolymers. Main adsorption parameters, kinetic models, adsorption isotherms, thermodynamics of the adsorption process, as well as regeneration of the polymeric sorbents were discussed.

Speciation of Hexavalent Chromium in Aqueous Solutions Using a Magnetic Silica-Coated Amino-Modified Glycidyl Methacrylate Polymer Nanocomposite

“…A thermodynamic investigation was conducted at four temperatures in the 298–343 K range. Table 5 shows the thermodynamic parameters of chromium sorption calculated from experimental data using Equations (3)–(5) [ 28 ]: where C e (mg/dm 3 ) and C a (mg/dm 3 ) are the concentration of chromium ions in solution at equilibrium and the amount of chromium ion sorbed onto Fe 3 O 4 @APTMS/PGME-deta at equilibrium, respectively, R (8.314 J/mol K) is the universal gas constant, T (K) the absolute temperature and Δ G 0 (kJ/mol), Δ S 0 (kJ/mol K), and Δ H 0 (kJ/mol) are the change of standard Gibbs free energy, standard entropy, and standard enthalpy, respectively.…”

“…Multifunctional, highly cross-linked macroporous glycidyl methacrylate-based non-magnetic and magnetic copolymers were successfully applied for decades in the sorption of heavy and precious metals, organic compounds, radionuclides, etc. [ 26 , 27 , 28 ].…”

Fast Gold Recovery from Aqueous Solutions and Assessment of Antimicrobial Activities of Novel Gold Composite

“…Since the experimental data fit very well to the Avrami model, the four diffusion-based kinetic models (liquid film diffusion (Equation ( 7)), intra-particle diffusion (Equation ( 8)), the Bangham model (Equation ( 9)), and the Boyd model (Equation ( 10))) were used to further understand the mechanism of Au adsorption onto pGME-en, as well as to determine the rate-controlling step of the processes [42]. The values of obtained diffusion-based kinetic parameters are represented in Table 2, while the results of the fitting results are shown in Figure 5b.…”

“…The adsorption half time was 5 min, and after 30 min, only a negligible variation of adsorption capacity was noticed. In order to acquire information about the types of interactions between pGME-en and Au ions and elucidate the adsorption rate, the experimental data were evaluated using the following surface reaction-based kinetic models: pseudo-first-order (Equation ( 2)), pseudosecond-order (Equation ( 3)), Elovich (Equation ( 4)), modified Freundlich (Equation ( 5)), and Avrami kinetic models (Equation ( 6)) [42,43]. The kinetic parameters of the adsorption process were derived using non-linear regression fitting methods.…”

Reactive Polymer Composite Microparticles Based on Glycidyl Methacrylate and Magnetite Nanoparticles

“…When epoxy groups are part of insoluble materials (organic, inorganic, hybrid, or composite), their presence allows the materials to be easily modified to obtain new materials with properties tuned to specific applications. For example, glycidyl methacrylate polymers were applied for the immobilization of enzymes [2,3], as drug transport systems [4,5], as sorbents in some types of chromatography, for the recovery of metals from aqueous solutions [6,7], and as catalyst supports [8,9].…”