Beijing Advanced Sciences and Innovation Center of CAS, Beijing, 101407, China.
Environ Sci Pollut Res Int. 2019 Sep;26(27):28294-28308. doi: 10.1007/s11356-019-05631-y. Epub 2019 Jul 31.
Stable Hg(II)-containing flue gas has been successfully simulated by the plasma oxidation of Hg(0), and an effective solution for Hg(0) mercury fumes was obtained by combining the plasma with a ceramic nanomaterial. Characterization tests showed that the ceramic nanomaterial was mainly composed of silicon dioxide (SiO) with other minor constituents, including potassium mica (KAlSiO), iron magnesium silicate (FeMgSiO) and dolomite (CaMg(CO)). The nanomaterial had many tube bank structures inside with diameters of approximately 8-10 nm. The maximum sorption capacity of Hg(II) was 5156 μg/g, and the nanomaterial can be regenerated at least five times. During the adsorption, chemical adsorption first occurred between Hg(II) and sulfydryl moieties, but these were quickly exhausted, and Hg(II) was then removed by surface complexation and wrapped into Fe moieties. The pseudo-first-order kinetic model and the Langmuir equation had the best fitting results for the kinetics and isotherms of adsorption. This work suggests that the ceramic nanomaterial can be used as an effective and recyclable adsorbent in the removal of gaseous Hg(II).
稳定的含汞(II)烟气已成功通过 Hg(0)的等离子体氧化模拟得到，通过将等离子体与陶瓷纳米材料相结合，获得了一种有效去除 Hg(0)汞蒸气的方法。表征测试表明，陶瓷纳米材料主要由二氧化硅 (SiO) 组成，还有其他少量成分，包括钾云母 (KAlSiO)、铁镁硅酸盐 (FeMgSiO) 和白云石 (CaMg(CO))。纳米材料内部有许多管排结构，直径约为 8-10nm。Hg(II)的最大吸附容量为 5156μg/g，纳米材料至少可以再生 5 次。在吸附过程中，Hg(II)首先与巯基发生化学吸附，但这些很快就被耗尽，然后通过表面络合将 Hg(II)去除并包裹在 Fe 基团中。吸附的动力学和等温线最符合准一级动力学模型和朗缪尔方程。这项工作表明，陶瓷纳米材料可用作去除气态 Hg(II)的有效且可回收的吸附剂。
