Chelating Fabrics Prepared by an Organic Solvent-Free Process for Boron Removal from Water

Abstract

A chelating fabric was prepared by graft polymerization of glycidyl methacrylate (GMA) onto a nonwoven fabric, followed by attachment reaction of N-methyl-D-glucamine (NMDG) using an organic solvent-free process. The graft polymerization was performed by immersing the gamma-ray pre-irradiated fabric into the GMA emulsion, while the attachment reaction was carried out by immersing the grafted fabric in the NMDG aqueous solution. The chelating capacity of the chelating fabric prepared by reaction in the NMDG aqueous solution without any additives reached 1.74 mmol/g, which further increased to above 2.0 mmol/g when surfactant and acid catalyst were added in the solution. The boron chelation of the chelating fabric was evaluated in a batch mode. Fourier transform infrared spectrophotometer (FTIR) was used to characterize the fabrics. The chelating fabric can quickly chelate boron from water to form a boron ester, and a high boron chelating ability close to 18.3 mg/g was achieved in the concentrated boron solution. The chelated boron can be eluted completely by HCl solution. The regeneration and stability of the chelating fabric were tested by 10 cycles of the chelation-elution operations. Considering the organic solvent-free preparation process and the high boron chelating performance, the chelating fabric is promising for the boron removal from water.

Novel Hybrid Adsorption-Electrodialysis (AdED) System for Removal of Boron from Geothermal Brine

“…In Figure 2e, when FT-IR spectra of cellulose and grafted cellulose are compared, due to the GMA introduction into the structure of raw cellulose, the characteristic peak of C�O related to GMA formed with the addition of a high amount of carboxyl groups at 1722 cm −1 and the peaks attributed to the epoxy rings at 845, 757−788, and 905 cm −1 formed, and the results are in line with the literature. 17,25,26 Also, the addition of GMA to the −OH groups of cellulose as proposed in the reaction scheme given in Figure 9, resulted in decrease of the −OH peaks at 3320 cm −1 and suggesting successful binding of GMA to raw cellulose. 23 As a result of NMDG binding to grafted cellulose, previously disappeared −OH peaks at 3320 cm −1 reappeared due to the addition of −OH groups present in the NMDG structure.…”

“…For the hybrid system, a novel and environmentally friendly cellulose-based adsorbent containing glycidyl methacrylate (GMA) and a methyl- d -glucamine (NMDG) functional group was designed. Commercial boron selective adsorbents are mostly produced from a synthetic support such as polystyrene, and therefore utilization of low-cost and environmentally friendly cellulose is a viable option for sustainability. ,− Graft polymerization of GMA with benzoyl peroxide as initiator onto cellulose was employed since GMA provides highly polymerizable vinyl groups and epoxy rings that can host many functional groups including NMDG . The NMDG functional group provides selective removal of the boron species present in solutions by forming monochelates and bis-chelates as shown in Figure ; therefore, it is a good candidate for boron removal. ,,− …”

“… 7 , 14 − 16 Graft polymerization of GMA with benzoyl peroxide as initiator onto cellulose was employed since GMA provides highly polymerizable vinyl groups and epoxy rings that can host many functional groups including NMDG. 17 The NMDG functional group provides selective removal of the boron species present in solutions by forming monochelates and bis-chelates as shown in Figure 1 ; therefore, it is a good candidate for boron removal. 5 , 9 , 18 − 21 …”