Construction of stable beta-cyclodextrin grafted polypropylene nonwoven fabrics for the adsorption of bisphenol A

AUTHORS: Wu, Yan; Zhang, Xue-Qi; Guo, Xiao-Jing; Kong, Ling-Hui; Shen, Rong-Fang; Hu, Jiang-Tao; Yan, Xi; Chen, Yan; Lang, Wan-Zhong
Herein, a convenient and environment-friendly grafting strategy was used to anchor beta-cyclodextrin (beta-CD) on polypropylene (PP) fabric, which includes grafting of GMA onto PP nonwoven fabric via Co-60 gamma-ray and introduction of beta-CD by the ring-opening reaction between the hydroxyl group of beta-CD and the epoxy group of GMA. The as-prepared fabric composite (PP-g-GMA-beta CD) showed a bisphenol A (BPA) adsorption amount of 27.72 mg/g in the single BPA solution (75 ppm). The BPA adsorption amount by PP-g-GMA-beta CD was not sensitive to pH condition, and the anti-interference ability to ions was also strong. The Langmuir isotherm model was found to be suitable for the adsorption of BPA, and the entire adsorption process followed the pseudo-second-order kinetics. PP-g-GMA-beta CD showed excellent stability and reusability that the BPA adsorption amount remained almost unchanged after 10 successive recycles. In the BPA and methyl orange (MO) mixed solution (BPA: 75 ppm; MO: 50 ppm), the adsorption amounts of BPA and MO by PP-g-GMA-beta CD were 23.88 and 20.83 mg/g, respectively. The presence of MO resulted in a little decrease in the adsorption amount of BPA, as beta-CD can also form host-guest complexes with MO, and there would also be 7C-7C and H-bond interactions between BPA and MO.