Antibiofouling Ultrathin Poly(amidoxime) Membrane for Enhanced U(VI) Recovery from Wastewater and Seawater
Antibiofouling Ultrathin Poly(amidoxime) Membrane for Enhanced U(VI) Recovery from Wastewater and Seawater
复制标题
用于增强废水和海水中 U(VI) 回收的抗污超薄聚（偕胺肟）膜
DOI：
10.1021/acsami.1c02882
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发表时间：
2021-05-04
影响因子：
9.5
通讯作者：
Wang, Ning
中科院分区：
文献类型：
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作者：
Sun, Ye;Liu, Rongrong;Wang, Ning
尽管生态友好型的胺肟基吸附剂对铀(U)具有良好的吸附能力，但其对铀的吸附效率通常会因水环境中细菌/微生物的生物附着而降低甚至破坏。在本论文中，我们通过将季胺化壳聚糖(Q-CS)和聚酰胺肟分散在交联磺化纤维素纳米晶(S-CnC)网络中，制备了一种具有极高的U吸附性能的抗生物污染超薄聚酰胺肟膜(AUPM)。交联型S-数控不仅可以提高AUPM的亲水性，提高其对铀的吸附效率，而且还可以提高机械强度，形成自支撑的超薄膜(17.21 Mpa，10µm厚)。更重要的是，由于Q-CS的广谱抗菌季铵基团，该AUPM具有良好的抗生物结垢性能。结果表明，在低浓度(100 Ppb)加铀纯水(pH约为5)和海水(pH约为8)的1.00 L范围内，30 mg的AUPM可分别回收93.7%和91.4%的铀。此外，与未加Q-CS的空白膜相比，AUPM在天然海水中放置25d后，其吸铀量可显著提高37.4%，从6.39 mg/g增加到8.78 mg/g，并且在10次吸附-脱附循环中仍能保持几乎恒定的抗拉强度，这表明AUPM具有较长的使用寿命。该AUPM是一种高效、大规模地从含铀废水、海水和天然海水中回收铀的候选方案，这将大大有助于铀污染的治理和浓缩铀用于核电的消耗。更重要的是，该工作将为通过引入抗菌性能和高机械性能来制备新型高效、低成本的U型吸附剂提供一种新的方便而普遍的策略，这将为新型高效U型吸附剂的设计提供很好的参考。
Although eco-friendly amidoxime-based adsorbents own an excellent uranium (U)-adsorption capacity, their U-adsorption efficiency is commonly reduced and even damaged by the biological adhesion from bacteria/microorganisms in an aqueous environment. Herein, we present an antibiofouling ultrathin poly(amidoxime) membrane (AUPM) with highly enhanced U-adsorption performance, through dispersing the quaternized chitosan (Q-CS) and poly(amidoxime) in a cross-linked sulfonated cellulose nanocrystals (S-CNC) network. The cross-linked S-CNC not only can elevate the hydrophilicity to improve the U-adsorption efficiency of AUPM but also can enhance the mechanical strength to form a self-supporting ultrathin membrane (17.21 MPa, 10 mu m thickness). More importantly, this AUPM owns a good antibiofouling property, owing to the broad-spectrum antibacterial quaternary ammonium groups of the Q-CS. As a result, within the 1.00 L of low-concentration (100 ppb) U-added pure water (pH approximate to 5) and seawater (pH approximate to 8) for 48 h, 30 mg of AUPM can recover 93.7% U and 91.4% U, respectively. Furthermore, compared with the U-absorption capacity of a blank membrane without the Q-CS, that of AUPM can significantly increase 37.4% reaching from 6.39 to 8.78 mg/g after being in natural seawater for only 25 d. Additionally, this AUPM can still maintain almost constant tensile strength during 10 cycles of adsorption-desorption, which indicates the relatively long-term usability of AUPM. This AUPM will be a promising candidate for highly efficient and large-scale U-recovery from both U-containing waste freshwater/seawater and natural seawater, which will be greatly helpful to deal with the U-pollution and enrich U for the consumption of nuclear power. More importantly, the work will provide a new convenient but universal strategy to fabricate new highly enhanced low-cost U-adsorbents, through the introduction of both an antibacterial property and a high mechanical performance, which will be a good reference for the design of new highly efficient U-adsorbents.