State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, 210023, P. R. China.
China School of Environment & Natural Resources, Renmin University of China, Beijing, 100872, P. R. China.
Sci Rep. 2020 Mar 23;10(1):5188. doi: 10.1038/s41598-020-62153-1.
Quaternized polyacrylic polymer has many applications in water treatment because of its ion exchange effects, but its further industrial applications are largely restricted because of its poor mechanical strength. In this work, a magnetic anion exchange resin with a polyacrylic matrix (MAP) was prepared by incorporation of FeO and subsequent modification with tetraethyl orthosilicate (TEOS) to improve the mechanical strength and adsorption performance. The incorporation of FeO significantly enhanced the mechanical strength of the polymer and improved the sphericity rate after ball milling of the polyacrylic resin from 80.1% to 97.2% as a result of hydrogen bonding between the -OH groups on FeO and the -NH- groups on the resin matrix. Further TEOS modification could effectively prevent FeO particles from dislodging from the resins. The adsorption performance was evaluated by using ibuprofen as a model compound. The adsorption kinetics showed that adsorption equilibrium was reached in 150 min. XPS analysis indicated that hydrogen bonding greatly contributed to the adsorption of ibuprofen onto the MAP. Adsorption isotherm analysis indicated that the adsorption was endothermic.
季铵化聚丙烯酸聚合物由于其离子交换作用，在水处理中有许多应用，但由于其机械强度差，其进一步的工业应用在很大程度上受到限制。在这项工作中，通过掺入 FeO 并随后用四乙氧基硅烷（TEOS）进行改性，制备了一种具有聚丙烯酸基质的磁性阴离子交换树脂（MAP），以提高机械强度和吸附性能。FeO 的掺入显著提高了聚合物的机械强度，并将聚丙烯酸树脂球磨后的球形率从 80.1%提高到 97.2%，这是由于 FeO 上的-OH 基团和树脂基质上的-NH-基团之间的氢键作用。进一步的 TEOS 改性可以有效地防止 FeO 颗粒从树脂上脱落。采用布洛芬作为模型化合物评价了吸附性能。吸附动力学表明，在 150 分钟内达到吸附平衡。XPS 分析表明，氢键对 MAP 上布洛芬的吸附有很大贡献。吸附等温线分析表明，吸附是吸热的。
