Elemental Mercury Adsorption by Cupric Chloride-Modified Mesoporous Carbon Aerogel

Colloids and Interfaces

Wu, Jiang¹  Lu, Cheng²  Liu, Dongjing³ 

[1] Author to whom correspondence should be addressed.;College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China;School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China

关键词: elemental mercury;    carbon aerogel;    covalent chlorine;    copper chloride;   

DOI  :  10.3390/colloids2040066

学科分类：物理化学和理论化学

来源: mdpi

【 摘 要 】

Mesoporous carbon aerogels (MCA) synthesized via aqueous polymerization of resorcinol and formaldehyde were modified by copper chloride and applied for adsorption removal of elemental mercury (Hg0) at a low temperature. The sorbents were characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), nitrogen adsorption/desorption isotherms, and X-ray photoelectron spectroscopy (XPS) techniques. The results show that CuCl2-modified MCA exhibited good ability for Hg0 adsorption in the 40–160 °C temperature range, with Hg0 removal efficiency all above 95.0%. The Hg0 removal efficiency first increased and then decreased with the elevation of reaction temperature. It performed optimally at 80 °C with the highest Hg0 removal efficiency of 98.7%. XPS results indicate that covalent chlorines (C-Cl groups) play an important role in elemental mercury adsorption process. Hg0 is firstly captured in the form of oxidized mercury (Hg2+) and then reacts with C-Cl groups to form HgCl2.

【 授权许可】

CC BY