Wang Ying, Lin Zaiwen, Zhang Hongsen, Liu Qi, Yu Jing, Liu Jingyuan, Chen Rongrong, Zhu Jiahui, Wang Jun
Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China.
Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China.
J Colloid Interface Sci. 2021 Sep 15;598:455-463. doi: 10.1016/j.jcis.2021.03.154. Epub 2021 Mar 29.
With the growing demand for nuclear energy, uranium extraction from seawater (UES) is becoming increasingly important due to the ocean reserves 4.5 billion tons for uranium(VI) [U(VI)]. Herein, two kinds of amidoxime modified bamboo charcoal (AOOBCS and AOOBCH) with porous structure, anti-bacterial, and super-hydrophilic properties were successfully synthetized by two etching methods (soaking and hydrothermal). The super-hydrophilic property of AOOBCH accelerated the contact between the amidoxime group and uranyl ions (UO), and promoted the action of anti-bacterial substances (bamboo-quinone) on bacteria to restrain the form of bacterial membrane. In addition, the amidoxime groups not only didn't destroy the super-hydrophilic surface, but also adjusted the adsorbents' pK by changing the amidoxime grafting rate. Under PH = 7, the adsorption capacity of AOOBCH was about 1.97 times that of AOOBCS and 2.95 times that of BC. Importantly, the AOOBCH exhibited ultra-high uptake capacity (6.37 mg g) and exceptional selectivity for U(VI) in 100-fold interfering ions simulated seawater system due to the chelation between C(NH)NOH and UO to form a more stable coordination structure (E = -36.56 eV). Benefiting from the superior performance and selectivity, the AOOBCH is a potential candidate for UES.
随着对核能需求的不断增长，由于海洋中铀（VI）[U（VI）]储量达45亿吨，从海水中提取铀（UES）变得越来越重要。在此，通过两种蚀刻方法（浸泡和水热法）成功合成了两种具有多孔结构、抗菌和超亲水性的偕胺肟改性竹炭（AOOBCS和AOOBCH）。AOOBCH的超亲水性加速了偕胺肟基团与铀酰离子（UO）之间的接触，并促进了抗菌物质（竹醌）对细菌的作用，抑制细菌膜的形成。此外，偕胺肟基团不仅没有破坏超亲水表面，还通过改变偕胺肟接枝率来调节吸附剂的pK。在pH = 7时，AOOBCH的吸附容量约为AOOBCS的1.97倍，是BC的2.95倍。重要的是，由于C（NH）NOH与UO之间的螯合作用形成了更稳定的配位结构（E = -36.56 eV），AOOBCH在100倍干扰离子模拟海水体系中对U（VI）表现出超高的吸附容量（6.37 mg g）和优异的选择性。得益于其优异的性能和选择性，AOOBCH是一种潜在的UES候选材料。
