Adsorption of Gaseous Elemental Mercury by Ferric-Chloride-Modified Activated Carbon Under Low-Temperature Conditions

作者：Wang, Xueqian; Wang, Langlang; Bian, Zhentao; Ning, Ping^*; Wang, Ping; Wang, Fei; Ma, Yixing

来源：Clean-Soil Air Water, 2018, 46(12): 1800351.

DOI：10.1002/clen.201800351

• activated carbon
• adsorption
• ferric chloride
• mercury

Removal efficiency of elemental mercury (Hg-0) over activated carbon (AC) modified with ferric chloride (FeCl3) is investigated at low temperatures. The effects of impregnation concentration, reaction temperature, oxygen content, relative humidity, and hydrogen sulfide (H2S) on Hg-0 removal efficiency are investigated. The results indicate that the removal ability of Hg-0 can be significantly improved by the introduction of FeCl3. Furthermore, the FeCl3-modified AC exhibit the best removal efficiency toward Hg-0 when the concentration of FeCl3 is 0.15 mol L-1 and reaction temperature is 50 degrees C. In addition, H2S shows a positive effect on Hg-0 removal, while H2O(g) can inhibit the removal of Hg-0 due to competitive adsorption. Fe2O3 and C-Cl are generated on FeCl3-modified AC (with FeCl3 impregnation concentration of 0.15 mol L-1) catalyst and contribute to Hg-0 removal. Moreover, Hg exists mainly in the form of mercuric chloride (HgCl2) and mercuric oxide (HgO) on the surface of the samples. Finally, the removal of Hg-0 is achieved through the following two pathways: by the reaction of Hg-0 with C-Cl and reaction of Hg-0 with Fe2O3.

• 出版日期2018-12
• 单位昆明理工大学