Effect of oxidation treatment on the adsorption and the stability of mercury on activated carbon

作     者：HU Chang-xing ZHOU Jin-song LUO Zhong-yang HE Sheng WANG Guang-kai CEN Ke-fa 

作者机构：State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2006年第18卷第6期

页      面：1161-1166页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081702[工学-化学工艺] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070602[理学-大气物理学与大气环境] 0706[理学-大气科学] 

基　　金：The National Natural Science Foundation of China (No. 50476056) the Hi-Tech Research and Development Program (863) ofChina (No. 2005AA520080) 

主　　题：activated carbon oxidation treatment Hg adsorption stability 

摘      要：Oxidation treatment on the adsorption and the stability of Hg on activated carbon （AC） was inrestigated. Both MnO2-AC and FeCl3-AC were produced during oxidation treatment. The measurement of modified AC＇s mercury adsorption capacity was conducted in a simulated coal-fired flue gas by adsorbing test apparatus. TCLP and column leaching methods were used to test the stability of mercury adsorbed on ACs. The results indicate that the oxidation treatment changed the pore structure of the AC and modified the carbon surface by creating chemical components such as MnO4^-, Mn^4＋, O, NO^3-, Fe^3＋, Cl^-, etc. The Hg sorption capacity on MnO2-AC or FeCl3-AC was about three times higher than that of untreated carbon. In addition, the mercury control cost of each of the formers was about the half cost of the untreated carbon. The stability of Hg absorption was studied, it found that mercury adsorbed on the oxidation treated AC was not better than that of untreated carbon. It could concluded that the insoluble form of Hg is very important to the stability of mercury adsorbed on AC. This study suggests that the FeCl3-AC is the best absorbent for Hg with high adsorption capacity, better Hg adsorption stability in leaching environment, and lower cost among the three ACs tested.