Background Inorganic materials with high O/N content for Uranium Extraction from Seawater (UES) show fast-adsorption rate, but practical applications are limited by their easy dispersion, difficult recovery, and poor selectivity. Therefore, inspired by the macroscopic large-area molding, antibacterial properties, and hierarchical porous microstructure of bamboo strips (BS), a nanoscale spindle-shaped phosphotungstic acid (PTA) loaded amidoximated BS (AOBS) as the inorganic/organic composite material with high O/N content is designed and applied to extracting uranium. Methods Under the effects of the hydrogen bonding crosslinking, the protonation process of -NH 2 , the physical limitations of PEG molecular chains, and others, a nanoscale spindle-shaped PTA loaded fibrous AOBS (PW 12 AOBS) is successfully synthesized by chemical cross-linking and hydrothermal methods. Significant Findings PW 12 AOBS has the super-hydrophilic surface and ultra-fast infiltration rate, so that it exhibits an excellent antibacterial performance and a super-fast adsorption rate. When the contact time is 5 mins, the adsorption capacity is 195.6 mg·g −1 , and a removal rate of uranium is 78.2 %. The highest removal rate of uranium is 82.6 %, and the adsorption capacity reaches 343.6 μg·g −1 in simulated seawater. The terminal OH/-COOH and bridging W = O from PW 12 AOBS synchronously act as the active sites for extracting uranium.
Xiaoxuan Dai,Xingyu Ma,Mingxuan Zhang,Shijun Li,Wangzhi Chen,Lei Li
Meriting from the unique affinity of amidoxime groups towards uranium ions, porous organic polymers (POPs) substituted with cyano groups are promising precursors as high-performance uranium adsorbents. However, their synthesis suffers from harsh conditions, tedious operations, or costly catalysts, which hamper their large-scale utilization. Free-radical alternating copolymerization strategy offers a simple and viable approach to circumvent these bottlenecks with great atomic economy. Here, two electron-withdrawing cyano monomers, acrylonitrile (AN) and fumaronitrile (FN), are successfully integrated with the electron-rich divinylbiphenyl (DVBP) monomer via free-radical alternating copolymerization strategy, forming two family of POPs with tailorable cyano contents. After post-amidoximation, two types of amidoxime-functionalized POPs (AO-POPs) are consequently obtained. Having probed the cyano-induced penultimate effect, it is observed that different feed ratios has regulated the polymerization behaviors, porosities and even adsorption capacities of AO-POPs. Among them, AO-POPs-FN-3, with an appropriate specific surface area and the highest amidoxime content, exhibits the best uranium adsorption capacity (723 mg g −1 ), along with good selectivity and regenerability. This work demonstrates an environmentally friendly and easy-to-operate free radical copolymerization strategy for the rational design of POPs-based adsorbents and paving for the recycling and sustainable development of uranium resources.
危险品化学品经营许可证（带存储）