Universidad San Jorge, Autovía A23 Zaragoza-Huesca km 510, 50830 Villanueva de Gállego, Zaragoza, Spain.
J Hazard Mater. 2013 Sep 15;260:247-54. doi: 10.1016/j.jhazmat.2013.05.034. Epub 2013 May 27.
The objective of this work is to evaluate a novel regenerable sorbent for mercury capture based on gold nanoparticles supported on a honeycomb structured carbon monolith. A new methodology for gold nanoparticles deposition onto carbon monolith support has been developed to obtain an Au sorbent based on the direct reduction of a gold salt onto the carbon material. For comparison purposes, colloidal gold method was also used to obtain Au/C sorbents. Both types of sorbents were characterized by different techniques in order to obtain the bulk gold content, the particle size distribution and the chemical states of gold after deposition. The mercury capture capacity and mercury capture efficiency of sorbents were tested in a bench scale facility at different experimental conditions. The regenerability of the sorbents was tested along several cycles of Hg capture-regeneration. High retention efficiencies are found for both types of sorbents comparing their gold content. Moreover, the high retention efficiency is maintained along several cycles of Hg capture-regeneration. The study of the fresh sorbent, the sorbent after Hg exposition and after regeneration by XPS and XRD gives insight to explain those results.
本工作旨在评估一种新型基于负载在蜂窝状结构碳载体上的金纳米粒子的汞捕获再生性吸附剂。为了获得基于金盐在碳材料上直接还原的 Au 吸附剂，开发了一种将金纳米粒子沉积到碳载体上的新方法。为了进行比较，还使用胶体金法获得了 Au/C 吸附剂。通过不同的技术对两种吸附剂进行了表征，以获得沉积后金的体相金含量、粒径分布和化学状态。在不同的实验条件下，在台架设施中测试了吸附剂的汞捕获容量和汞捕获效率。对吸附剂进行了多次汞捕获-再生循环的可重复使用性测试。与金含量相比，两种类型的吸附剂都表现出了高的保留效率。此外，在多次汞捕获-再生循环中，高保留效率得以保持。通过 XPS 和 XRD 对新鲜吸附剂、暴露于汞后的吸附剂以及再生后的吸附剂进行研究，为解释这些结果提供了深入的了解。
