Engineering Department, Shahid Beheshti University, G.C., P.O. Box 1983969411, Tehran, Iran.
Academic Center for Education, Culture and Research (ACECR), Environmental Research Institute, Siadati Street, Mellat Avenue, P.O. Box 3114-41635, Rasht, Iran.
Sci Rep. 2019 Jul 4;9(1):9686. doi: 10.1038/s41598-019-46090-2.
A novel mesoporous silica with enhanced phosphonic functional groups (PFGs) and without any silane agents was provided by Sol-Gel technique for selective adsorption of U(VI) from aqueous solutions (AqS). The absorbent was synthesized based on the achieving the four best performance characteristics including availability, economically, adsorption efficiency, and selectivity which are undoubtedly defined the usefulness of the adsorbents. The sorption results exhibited the highest uranium adsorption capacity, qe, of 820.7 mg/g at pH ≈ 8 which indicated the adsorbent is the best alternative for uranium adsorption from the nearly neutral solutions such as seawater. The recovery percentages by the adsorbent in the aqueous environments involving other elements such as Mg, Cd, Hg, As, Ca, Na, Ni and the salty environment with high concentration of Cl ions are indicated that the adsorbent presents the acceptable selectivity for uranium adsorption from the AqS such as industrial wastewater. Several activities and factors including removing the silane agents, using sodium metasilicate as an available and low-cost source of silica, and using the Sol-gel method as an unexpansive synthesis technique caused to reduce the synthesis costs from 222.787 EUR/kg for the template method to 60.078 EUR/kg for Sol-gel method which confirm the synthesis of a cost-effective adsorbent.
一种新型的介孔硅材料，具有增强的膦酸官能团（PFGs），并且不使用任何硅烷试剂，通过溶胶-凝胶技术合成，用于从水溶液（AqS）中选择性吸附 U(VI)。该吸附剂的合成基于实现四个最佳性能特性，包括可用性、经济性、吸附效率和选择性，这无疑定义了吸附剂的有用性。吸附结果表明，在 pH ≈ 8 时，铀的吸附容量达到了 820.7 mg/g，这表明该吸附剂是从近中性溶液（如海水）中吸附铀的最佳选择。在涉及其他元素（如 Mg、Cd、Hg、As、Ca、Na、Ni）的水相环境中和高浓度 Cl 离子的盐环境中的吸附剂回收百分比表明，该吸附剂对从 AqS（如工业废水）中吸附铀具有可接受的选择性。一些活性和因素，包括去除硅烷试剂、使用偏硅酸钠作为可用的和低成本的硅源，以及使用溶胶-凝胶法作为一种不昂贵的合成技术，导致合成成本从模板法的 222.787 欧元/公斤降低到溶胶-凝胶法的 60.078 欧元/公斤，证实了合成具有成本效益的吸附剂的可行性。
