Mu Wanjun, Li Mei, Li Xingliang, Ma Zongping, Zhang Rui, Yu Qianhong, Lv Kai, Xie Xiang, He Jiaheng, Wei Hongyuan, Jian Yuan
Institute of Nuclear Chemistry and Physics, China Academy of Engineering Physics, Mianyang, Sichuan, China.
Dalton Trans. 2015 Apr 28;44(16):7419-27. doi: 10.1039/c5dt00103j.
Large surface area hexagonal phase WO3 (h-WO3) nanowires were synthesized by a hydrothermal route with the assistance of C2H12N6O4S. They were characterized by XRD, SEM, TEM, BET, FT-IR and XPS. It is shown that C2H12N6O4S not only acts as a stabilizer to facilitate the generation of a metastable hexagonal phase, but also functions as a structure directing agent to assist the construction of nanowires. The obtained h-WO3 possesses a large specific surface area and numerous adsorption functional groups such as -OH groups. These characteristics result in an excellent adsorption performance for the removal of strontium from acidic aqueous solutions. A maximum adsorption capacity of 52.93 mg g(-1) was achieved on the h-WO3 prepared in the presence of C2H12N6O4S. This value is almost two times higher than that of bare h-WO3 (no C2H12N6O4S). The effects of pH, contact time, initial Sr(2+) concentration and ion strength on Sr(2+) removal from the solution by h-WO3 were systematically investigated. The adsorption mechanism involving the combination of electrostatic attraction and ion exchange for the adsorption of Sr(2+) is proposed. Based on our results, h-WO3 with high adsorption capacity and good surface characteristics exhibits great potential for the removal of Sr(2+) from radioactive wastewater.
在C2H12N6O4S的辅助下，通过水热法合成了大表面积的六方相WO3（h-WO3）纳米线。通过XRD、SEM、TEM、BET、FT-IR和XPS对其进行了表征。结果表明，C2H12N6O4S不仅作为稳定剂促进亚稳六方相的生成，还作为结构导向剂辅助纳米线的构建。所制备的h-WO3具有较大的比表面积和众多的吸附官能团，如-OH基团。这些特性使其在从酸性水溶液中去除锶方面具有优异的吸附性能。在C2H12N6O4S存在下制备的h-WO3上实现了52.93 mg g(-1)的最大吸附容量。该值几乎是裸h-WO3（无C2H12N6O4S）的两倍。系统研究了pH、接触时间、初始Sr(2+)浓度和离子强度对h-WO3从溶液中去除Sr(2+)的影响。提出了涉及静电吸引和离子交换相结合的Sr(2+)吸附机理。基于我们的研究结果，具有高吸附容量和良好表面特性的h-WO3在从放射性废水中去除Sr(2+)方面具有巨大潜力。
