Green Preparation of Aminated Magnetic PMMA Microspheres via EB Irradiation and Its Highly Efficient Uptake of Ce(III)

Abstract

The modification of polymers can significantly improve the ability to remove rare earth ions from wastewater, but so far few studies have focused on the irradiation-induced grafting method. In this study, a novel magnetic chelating resin for Ce(III) uptake was first synthesized by suspension polymerization of PMMA@Fe3O4 microspheres followed by irradiation-induced grafting of glycidyl methacrylate (GMA) and subsequent amination with polyethyleneimine (PEI). The FT-IR, SEM, TG and XRD characterization confirmed that we had successfully fabricated magnetic PMMA-PGMA-PEI microspheres with a well-defined structure and good thermal stability. The obtained adsorbent exhibited a satisfactory uptake capacity of 189.81 mg/g for Ce(III) at 318.15 K and an initial pH = 6.0. Additionally, the impact of the absorbed dose and GMA monomer concentration, pH, adsorbent dosage, contact time and initial concentration were thoroughly examined. The pseudo-second order and Langmuir models were able to describe the kinetics and isotherms of the adsorption process well. In addition, the thermodynamic data indicated that the uptake process was spontaneous and endothermic. Altogether, this research enriched the Ce(III) trapping agent and provided a new method for the removal rare earth pollutants.

Efficient Removal of Cr(VI) by Protonated Amino-Bamboo Char Prepared via Radiation Grafting: Behavior and Mechanism

“…For the spectra of DGBC (Figure 1c), the characteristic peaks for the epoxide groups almost disappear, which can be ascribed to the reaction with DETA. In addition, new peaks at 1064 cm −1 (C-N stretching vibration), and 3745 cm −1 (N-H stretching vibration) appear, indicating that DETA was successfully reacted with GBC [22,23]. After the protonation of amine (Figure 1d), the peak intensity of the…”

“…The capacity of adsorption (Q, mg/g), and removal efficiency (R, %) were calculated using Equations ( 1)-(3) [23,25]:…”

“…However, there are few reports that focus on the radiation grafting modification of bamboo. Electron beam irradiation-induced grafting has many advantages over traditional chemical initiation grafting, including no need for initiators, a faster process, energy efficiency, environmental friendliness, safety, and wider applications [21][22][23]. Therefore, a novel cation-functionalized bamboo char (BC) is fabricated via the electron beam irradiation grafting method in this work.…”

Rare Earth Elements Uptake by Synthetic Polymeric and Cellulose-Based Materials: A Review

“…2-Ethylhexyl phosphonic acid mono-2-ethylhexyl (PC88A)–doped silica functionalized β-cyclodextrin supported in Fe 3 O 4 performs better than commercial resins capturing REEs, having up to 64 mg/g capture capacity for REEs. It showed selectivity toward REEs in the presence of other metal cations, such as Na (I), Mg (II), Ca (II), Ni (II), and Zn (II), at low acidic pH values [ 40 ]. Poly (methyl methacrylate–glycidyl methacrylate–ethylenimine)-grafted-Fe 3 O 4 microspheres produced by means of a novel irradiation-induced grafting method showed capture capacity up to 189.8 mg/g for Ce (III) at pH 6.0 [ 41 ].…”

Analysis of the Adsorption-Release Isotherms of Pentaethylenehexamine-Modified Sorbents for Rare Earth Elements (Y, Nd, La)

“…Many different techniques were studied for such purpose, including chemical precipitation, adsorption, crystallization, ion exchange, coagulation, flocculation, and electrodialysis [ 18 ]. Solid/liquid adsorption can be considered as one of the preferred methods for the capture of REEs in cationic form contained in mixtures of dissolved WEEE, thanks to its overall simplicity, economic convenience, flexibility, and reversibility [ 14 , 17 , 19 , 20 , 21 ]. Moreover, the possibility to employ suitable materials from natural sources makes solid/liquid adsorption a green answer to the problem of REEs recovery.…”