Yang Lang, Sun Ye, Sun Yue, Wang Jiawen, Chen Lin, Feng Xueliang, Wang Jinggang, Wang Ning, Zhang Dong, Ma Chunxin
State Key Laboratory of Marine Resource Utilization in South China Sea, School of Chemistry and Chemical Engineering, Hainan University, Haikou 570228, China.
Key Laboratory of Quality Safe Evaluation and Research of Degradable Material, State Administration for Market Regulation, Hainan Academy of Inspection and Testing, Haikou 570203, China.
Gels. 2024 Sep 22;10(9):603. doi: 10.3390/gels10090603.
Amidoxime-functionalized hydrogels are one of most promising adsorbents for high-efficiency uranium (U) extraction from seawater, but bioadhesion on their surface seriously decreases their adsorption efficiency and largely shortens their service life. Herein, a semi-interpenetrating zwitterion-poly(amidoxime) (ZW-PAO) hydrogel was explored through introducing a PAO polymer into a poly [3-(dimethyl 4-vinylbenzyl amino) propyl sulfonate] (PDVBAP) polyzwitterionic (PZW) network via ultraviolet (UV) polymerization. Owing to the anti-polyelectrolyte effect of the PZW network, this ZW-PAO hydrogel can provide excellent super-hydrophilicity in seawater for high-efficiency U-adsorption from seawater. Furthermore, the ZW-PAO hydrogel had outstanding anti-biofouling performance for both highly enhanced U-adsorption and a relatively long working life in natural seawater. As a result, during only 25 days in seawater (without filtering bacteria), the U-uptake amount of this ZW-PAO hydrogel can reach 9.38 mg/g and its average rate can reach 0.375 mg/(g∙day), which is excellent among reported adsorbents. This work has explored a promising hydrogel for high-efficiency U-recovery from natural seawater and will inspire new strategy for U-adsorbing materials.
偕胺肟功能化水凝胶是从海水中高效提取铀最有前景的吸附剂之一，但其表面的生物粘附严重降低了吸附效率，并大大缩短了使用寿命。在此，通过紫外光聚合将偕胺肟聚合物（PAO）引入聚[3-（二甲基4-乙烯基苄基氨基）丙基磺酸盐]（PDVBAP）聚两性离子（PZW）网络中，制备了一种半互穿两性离子-聚偕胺肟（ZW-PAO）水凝胶。由于PZW网络的抗聚电解质效应，这种ZW-PAO水凝胶在海水中具有优异的超亲水性，可从海水中高效吸附铀。此外，ZW-PAO水凝胶在天然海水中具有出色的抗生物污损性能，既提高了铀的吸附量，又延长了使用寿命。结果，在海水中仅25天（未过滤细菌），这种ZW-PAO水凝胶的铀吸附量可达9.38 mg/g，平均吸附速率可达0.375 mg/（g∙天），在已报道的吸附剂中表现优异。这项工作探索了一种从天然海水中高效回收铀的有前景的水凝胶，并将激发铀吸附材料的新策略。
