Chen Yuxin, Chen Yujuan, Lu Dandan, Qiu Yunren
School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
Polymers (Basel). 2022 Jan 21;14(3):419. doi: 10.3390/polym14030419.
Combining the characteristics of rare earth extractants and water-soluble polymer complexants, a novel complexant phosphorylated chitosan (PCS) was synthesized by Kabachnik-Fields reaction with alkalized chitosan, dimethyl phosphonate, and formaldehyde as raw materials and toluene-4-sulfonic acid monohydrate (TsOH) as catalyst. The complexation properties of PCS and poly (acrylic acid) sodium (PAAS) for lanthanum ions in the solution were compared at the same pH and room temperature. In addition, the frontier molecular orbital energies of polymer-La complexes were calculated by the density functional theory method, which confirmed the complexation properties of the polymers to rare earths. The results indicate that the PCS has better water solubility compared with chitosan and good complex ability to rare earths, which can be used for rare earth separation by the complexation-ultrafiltration process.
结合稀土萃取剂和水溶性聚合物络合剂的特点，以碱化壳聚糖、磷酸二甲酯和甲醛为原料，对甲苯磺酸一水合物（TsOH）为催化剂，通过卡巴奇尼克-菲尔德斯反应合成了一种新型络合剂磷酸化壳聚糖（PCS）。在相同pH值和室温下，比较了PCS和聚丙烯酸钠（PAAS）在溶液中对镧离子的络合性能。此外，采用密度泛函理论方法计算了聚合物-镧配合物的前沿分子轨道能量，证实了聚合物对稀土的络合性能。结果表明，PCS与壳聚糖相比具有更好的水溶性和对稀土的良好络合能力，可用于络合超滤法分离稀土。
