Environ Technol. 2014 Mar-Apr;35(5-8):629-36. doi: 10.1080/09593330.2013.840321.
In this study, elemental mercury (EM) adsorbents were synthesized using tetraethyl orthosilicate (TEOS) and 3-mercaptopropyl trimethoxysilane as silica precursors. The synthesized silica gel (SG)-TEOS was further functionalized through impregnation with elemental sulphur and carbon disulphide (CS2). The SG adsorbents were then characterized by using scanning electron microscope, Fourier transform infra-red spectrophotometer, nitrogen adsorption/desorption, and energy-dispersive X-ray diffractometer. The EM adsorption of the SG adsorbents was determined using fabricated fixed-bed adsorber. The EM adsorption results showed that the sulphur-functionalized SG adsorbents had a greater Hgo breakthrough adsorption capacity, confirming that the presence of sulphur in silica matrices can improve Hgo adsorption performance due to their high affinity towards mercury. The highest Hgo adsorption capacity was observed for SG-TEOS(CS2) (82.62 microg/g), which was approximately 2.9 times higher than SG-TEOS (28.47 microg/g). The rate of Hgo adsorption was observed higher for sulphur-impregnated adsorbents, and decreased with the increase in the bed temperatures.
在这项研究中，使用四乙氧基硅烷（TEOS）和 3-巯丙基三甲氧基硅烷作为硅烷前体合成了元素汞（EM）吸附剂。合成的硅胶（SG）-TEOS 进一步通过浸渍元素硫和二硫化碳（CS2）进行功能化。然后使用扫描电子显微镜、傅里叶变换红外分光光度计、氮气吸附/解吸和能量色散 X 射线衍射仪对 SG 吸附剂进行了表征。使用制造的固定床吸附器测定了 EM 的吸附。EM 吸附结果表明，硫功能化的 SG 吸附剂具有更大的 Hgo 穿透吸附容量，这证实了由于其对汞的高亲和力，硫在硅基质中的存在可以改善 Hgo 吸附性能。观察到 SG-TEOS（CS2）（82.62μg/g）的 Hgo 吸附容量最高，约为 SG-TEOS（28.47μg/g）的 2.9 倍。硫浸渍吸附剂的 Hgo 吸附速率较高，并且随着床层温度的升高而降低。
