Adsorption of Gaseous Elemental Mercury by Ferric‐Chloride‐Modified Activated Carbon Under Low‐Temperature Conditions. Issue 12 (5th October 2018)

• Record Type: Journal Article
• Authors: Wang, Xueqian; Wang, Langlang; Bian, Zhentao; Ning, Ping; Wang, Ping; Wang, Fei; Ma, Yixing
• Is Part Of: Clean. Volume 46:Issue 12(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-10-05
• Subjects: activated carbon -- adsorption -- ferric chloride -- mercury; Water quality -- Periodicals; Water -- Pollution -- Periodicals; Pollution -- Periodicals; Bioremediation -- Periodicals; Sewage -- Periodicals; Water chemistry -- Periodicals; 333.7205
• DOI: 10.1002/clen.201800351
• Languages: English
• ISSNs: 1863-0650

Abstract

Abstract : 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 (H2 S) 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 °C. In addition, H2 S shows a positive effect on Hg 0 removal, while H2 O(g) can inhibit the removal of Hg 0 due to competitive adsorption. Fe2 O3 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 Fe2 O3 . Abstract : The ferric chloride modification of activated carbon exhibits excellent performance for Hg 0 removal. Oxygen and hydrogen sulfide had a positive effect in the removal of Hg 0, while H2 O(g) can inhibit the Hg 0 removal efficiency. According to the characterization results, Hg 0 on the surface of AIFCE‐0.15 exist mainly in the form of HgCl 2 and HgO.