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An efficient and reusable quaternary ammonium fabric adsorbent prepared by radiation grafting for removal of Cr(VI) from wastewater

Pang, Li-juan, Hu, Jiang-tao, Zhang, Mao-jiang, Yang, Chen-guang, Wu, Guo-zhong
Environmental science and pollution research international 2018 v.25 no.11 pp. 11045-11053
Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, adsorbents, adsorption, ammonium, anions, carbonates, chlorides, chromium, desorption, kinetics, models, nitrates, nonwoven fabrics, pH, phosphates, polyethylene, quaternary ammonium compounds, scanning electron microscopy, sorption isotherms, sulfates, thermogravimetry, wastewater, wastewater treatment
A novel quaternary ammonium polyethylene nonwoven fabric for removing chromium ions from water was prepared via radiation-induced grafting of glycidyl methacrylate and further modification with N,N′-dimethylethylenediamine. The structural and morphological characteristics of the adsorbent were analyzed using Fourier transform infrared spectroscopy (FTIR), thermogravimetry and differential thermogravimetry (TG/DTG), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The influences of several principal factors, including pH value, initial Cr(VI) concentration, contact time, and coexisting anions (including SO₄²⁻, CO₃²⁻, NO₃⁻, PO₄³⁻, and Cl⁻), on adsorption performance were investigated via batch tests. The results showed that the optimum removal efficiency was 99.2% at pH 3 and the maximum adsorption quantity for Cr(VI) at 25 °C was 336 mg/g. The adsorption kinetic parameters were better fitted with the pseudo-second-order kinetic model, and the equilibrium data were described very well by the Freundlich isotherm model. Furthermore, the as-synthesized adsorbent exhibited excellent regeneration and recyclability while maintaining high adsorption performance after five adsorption/desorption cycles.