Synthesis of chelating resins with iminodiacetic acid and its wastewater treatment application

Abstract

ABSTRACT:The chelating resins have high potential applications for the selective removal and recovery of metal ions from industrial waste solutions. The hydrophilic acrylate monomer with the iminodiacetic acid chelating group was prepared from glycidyl methacrylate and iminodiacetic acid at 60°C. The microbeads, prepared from acrylate monomer with the iminodiacetic acid chelating group, were employed by inversion suspension polymerization. In the pH range of 2-6, a reasonably good equilibrium sorption capacity is maintained for Cr 3ϩ (ca. 2.7 mmol/g) and Cu 2ϩ (ca. 1.8 mmol/g) in the chelating resins. The adsorption of Cd 2ϩ and Pb 2ϩ on microbeads is clearly affected by the pH of the solution, such that these ions' adsorption capacity increased with the pH of the aqueous solution. The adsorption of Cd 2ϩ (ca. 1.25-1.87 mmol/g) and Pb 2ϩ (ca. 0.99 -1.89 mmol/g) showed a maximum at approximately pH ϭ 5 and 6, respectively. The adsorption isotherms of Cr 3ϩ and Cu 2ϩ adsorbed on microbeads were following the Langmuir isotherm, but the adsorption behavior of Cd 2ϩ and Pb 2ϩ were not. The concentration of alkaline earth-metal cations on the range of 0 -200 ppm had no influence on metal ions adsorbed capacity of chelating resins. Additionally, NTA (nitrilotriacetic acid) had no significant influence on metal ion adsorption by chelating resins. Furthermore, phenol pollutant can be adsorbed effectively by metal ions chelated microbeads; therefore, the microbeads were useful not only in recovering metal ions but also in the treating phenol pollutants in wastewater.

Crystal structure of iminodiacetic acid monomethyl ester monohydrate, C5H9NO4 · H2O

“…The presence of two close carboxylic groups makes this molecule and its derivatives excellent ion coordination agents. This property has been fully exploited in the preparation of modified polymers and resins for ion capture, both for analytical [2][3][4] or industrial uses [5,6]. In medical related sciences, iminodiacetic acid derivatives are used as solid phase supports for peptide synthesis [7] and as base for chemical libraries in combinatory chemistry [8].…”

Metal ion sorption properties of water-insoluble resins based on sodium styrene sulfonate and different comonomers

“…The phosphonic group is responsible of recognition mechanism, while the sulfonic group is responsible of accessibility of metal ions into resin [11,12]. Several enhancements have been carried out, incorporating new functionalities by modification of resins beads, synthesizing new monomer, or combination of monomers [13][14][15][16][17][18].…”

Synthesis, characterization, and application of polyethersulfone bound‐iminodiacetic acid

“…5,6 Because of the good metal-ion adsorption performance, 7 polymer-IDAmetal complexes show widespread availability in various fields, such as separation of rare earth elements, 8 catalyst system, 9 protein separation, 10,11 and so on. To introduce IDA into polymer chain, the traditional method is to graft epoxides like epichlorohydrin 12 and glycidyl methacrylate 3,13 to polymer main chain firstly, and then graft IDA molecules by opening the epoxy ring. In this method, epoxides are introduced mainly through radiation; however, it is inconvenient to control the grafting rates.…”