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.
Highlights
The boron in seawater is about 4.5 mg/L, while in rivers it ranges from 0.3 to 100 mg/L
The chelating fabric was prepared by immersing the glycidyl methacrylate (GMA)-grafted fabric in an NMDG aqueous solution with different concentrations up to 40%, which is close to the saturation concentration at room temperature
The chelating kinetics of boron chelation is similar to the results reported by Ting et al, where the attachment reaction was performed in a 10% 1,4-dioxane solution [45]
Summary
The boron in seawater is about 4.5 mg/L, while in rivers it ranges from 0.3 to 100 mg/L. The boron removal is based on the chelation reaction shown in Scheme 1, Equation (3), where boric acid is chelated by the vicinal diol to form a stable five- or six-membered ring boron ester and release a proton [11,12,13]. The other frameworks, such as poly(glycidyl methacrylate-co-methyl methacrylate) [3], poly(glycidyl methacrylate-co-trimethylolpropane trimethacrylate) [14], poly(chloromethyl styrene-codivinylbenzene) [7,15], and cellulose [16], have been attached with the NMDG moieties to prepare the chelating resins for boron removal. The concentrations of monomer and NMDG solutions were presented in the form of weight percentage, and the concentrations of the boron aqueous solutions were presented as mg/L
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