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Anti-Biofouling and Water—Stable Balanced Charged Metal Organic Framework-Based Polyelectrolyte Hydrogels for Extracting Uranium from Seawater
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-04-01 , DOI: 10.1021/acsami.0c03007
Zhenyuan Bai 1, 2 , Qi Liu 1, 2, 3 , Hongsen Zhang 1 , Jing Yu 1, 2 , Rongrong Chen 1, 2, 3, 4 , Jingyuan Liu 1, 2 , Dalei Song 1, 2 , Rumin Li 1, 4, 5 , Jun Wang 1, 2, 4, 5
Affiliation  

Metal–organic frameworks (MOFs) are diffusely defined as a promising class of porous material for uranium extraction from seawater, but there are still challenges in their stability and anti-biofouling performance. Herein, a water-stable and anti-biofouling ZIF-67/SAP0.45 composite hydrogel was reported by the sequential processes of electrostatic interactions between the oppositely charged polymer, ionic gelation, and template growth of ZIF-67 crystals. Entanglement of positively charged polyethyleneimine (PEI) and negatively charged sodium alginate (SA) polymer chains provided external porosities, anti-biofouling properties, and mechanical support for the hydrogels and further reduced the possibility of ZIF-67 aggregation. The neutral composite hydrogel possessed the least Nitzschia on the surface after 7 days contact, which endows the adsorbent with a high uranium uptake capacity of 2107.87 ± 41.64 μg g–1 at 1 mg L–1 uranium-containing seawater with 8.6 × 105 mL–1 Nitzschia. Additionally, this adsorbent showed water stability with an uranium uptake capacity of 232.88 ± 8.02 mg g–1 even after five adsorption–desorption cycles because of the excellent preparation method. Benefitting from the distinctive hierarchical structure and large accessible surface area, the resultant adsorbent achieved a high uranium capacity of 6.99 ± 0.26 mg g–1 in real seawater. This flexible and scalable approach made the MOF/SAP composite hydrogel a highly desirable uranium adsorbent.

中文翻译:

用于从海水中提取铀的抗生物结垢和水-稳定的平衡平衡的带电金属有机骨架基聚电解质水凝胶

金属有机骨架(MOF)被广泛定义为一类很有前景的从海水中提取铀的多孔材料,但是在其稳定性和抗生物结垢性能方面仍然存在挑战。在此,水稳定且防污的ZIF-67 / SAP 0.45通过带相反电荷的聚合物之间的静电相互作用,离子胶凝作用和ZIF-67晶体的模板生长的顺序过程,报道了复合水凝胶。带正电的聚乙烯亚胺(PEI)和带负电的海藻酸钠(SA)聚合物链的缠结为水凝胶提供了外部孔隙,抗生物结垢特性和机械支持,并进一步降低了ZIF-67聚集的可能性。中性复合水凝胶接触7天后在表面上具有最小的尼兹菌,这使吸附剂在1 mg L –1含铀海水中具有8.6×10 5 mL时具有2107.87±41.64μgg –1的高铀吸收能力。–1尼采 此外,由于出色的制备方法,即使经过五个吸附-解吸循环,该吸附剂也显示出水稳定性,铀吸收能力为232.88±8.02 mg g –1。得益于独特的分级结构和较大的可及表面积,所得吸附剂在实际海水中的铀容量达到了6.99±0.26 mg g –1的高水平。这种灵活且可扩展的方法使MOF / SAP复合水凝胶成为非常理想的铀吸附剂。
更新日期:2020-04-01
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