Anti-Biofouling and Water—Stable Balanced Charged Metal Organic Framework-Based Polyelectrolyte Hydrogels for Extracting Uranium from Seawater,ACS Applied Materials & Interfaces

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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/SAP_0.45 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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