Song Yucheng,Ma Xin,Tan Huanhuan,Liu Zhong,Liu Chuntai,Shen Changyu,Yang Peipei,Li Songwei
Efficient capture of uranium(VI) (U(VI)) from seawater is of great significance to the sustainable development of nuclear energy and environmental protection, which is also a serious challenge at present. In this study, hollow Zn/Co zeolitic imidazolate framework (H-ZIF) was decorated on polyacrylamide/sodium alginate (PAM/SA) hydrogel by chelating and covalently crosslinking, and a new type of PAM/SA/H-ZIF hydrogel was synthesized. The combination of PAM/SA and H-ZIF gives PAM/SA/H-ZIF hydrogel excellent mechanical properties, good stability, and abundant surface functional groups, which is beneficial to improving the adsorption properties. The extraction amount of U(VI) by PAM/SA/H-ZIF is 171.14 mg·g −1 at C 0 = 99.52 mg·L −1 and pH = 5.0. The adsorption equilibrium is reached in 120 min and the adsorption process fits well with Langmuir isotherm model and pseudo-second-order rate equation. The PAM/SA/H-ZIF also showed good recyclability and stability after 10 cycles of adsorption—desorption. More importantly, the rate of uranium adsorption is 0.196 mg·g −1 ·day −1 after 30 days, which implies that the PAM/SA/H-ZIF could serve as a potential adsorbent for the development of uranium capture from seawater.
Iron, one of the most abundant elements on earth and an essential element for living organisms, plays a crucial role in our daily metabolism. In the field of catalysis, the development of high-performance catalysts based on less toxic iron element is also of significant importance for green chemistry and a sustainable future. To construct Fe-based heterogeneous catalysts with excellent hydrogenation performance, precise modulation of the atomic coordination structure is a key strategy for enhancing catalytic activity. In this study, we present an in-situ coating method for applying a zeolitic imidazolate framework (ZIF) onto the surface of fungal hyphae. The asymmetric coordination structure of Fe 1 -N 3 P 1 was precisely tailored by utilizing the phosphorus source from the fungus and the nitrogen source in the ZIFs. Detailed characterizations and density functional theory calculations revealed that the incorporation of ZIFs not only increased the specific surface area of catalysts, but also facilitated the dispersion of Fe 2 P nanoparticles into the Fe 1 -N 3 P 1 center, making the lowest reaction energy barrier and resulting in the best performance for nitrobenzene hydrogenation when compared to the Fe 2 P nanoparticles and clusters. This research introduces a novel design concept for constructing asymmetric monoatomic configuration based on the inherent characteristics of natural microorganisms and the exogenous porous coordination polymers.
危险品化学品经营许可证（带存储）