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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Guanidine sulfate-assisted synthesis of hexagonal WO3 nanoparticles with enhanced adsorption properties
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Guanidine sulfate-assisted synthesis of hexagonal WO3 nanoparticles with enhanced adsorption properties

机译：硫酸胍辅助合成具有增强吸附性能的六边形WO3纳米颗粒

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摘要

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 Sr2+ concentration and ion strength on Sr2+ 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 Sr2+ is proposed. Based on our results, h-WO3 with high adsorption capacity and good surface characteristics exhibits great potential for the removal of Sr2+ from radioactive wastewater.
机译：借助C2H12N6O4S的水热法合成了大表面积六方相WO3（h-WO3）纳米线。通过XRD，SEM，TEM，BET，FT-IR和XPS对它们进行了表征。结果表明，C2H12N6O4S不仅起到促进亚稳态六方相生成的稳定剂的作用，而且还起到结构导向剂的作用，有助于纳米线的构建。所得的h-WO 3具有大的比表面积和许多吸附官能团，例如-OH基团。这些特性为从酸性水溶液中去除锶提供了极好的吸附性能。在C2H12N6O4S存在下制备的h-WO3的最大吸附容量为52.93 mg g（-1）。该值几乎是裸h-WO3（无C2H12N6O4S）的两倍。系统地研究了pH，接触时间，初始Sr2 +浓度和离子强度对h-WO3从溶液中去除Sr2 +的影响。提出了静电吸附与离子交换相结合的Sr2 +吸附机理。根据我们的结果，具有高吸附能力和良好表面特性的h-WO3具有从放射性废水中去除Sr2 +的巨大潜力。

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