School of Environmental Science & Engineering, North China Electric Power University, Beijing, 102206, PR China.
School of Environmental Science & Engineering, North China Electric Power University, Beijing, 102206, PR China.
J Hazard Mater. 2018 Jan 5;341:228-237. doi: 10.1016/j.jhazmat.2017.07.047. Epub 2017 Jul 29.
A magnetic cobalt ferrite (CoFeO) catalyst was prepared by sol-gel method, and characterized by a X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Brunauer-Emmett-Teller (BET) and hysteresis loop method. The chemical states on surface of the fresh and spent catalysts were analyzed by a X-ray photoelectron spectroscopy (XPS). The experiments of elemental mercury (Hg) removal from flue gas were conducted in a laboratory scale using activated peroxymonosulfate (PMS) catalyzed by CoFeO, and the effects of the dosage of catalyst, the concentration of PMS, initial solution pH and reaction temperature on mercury removal efficiency were investigated. The average removal efficiency of Hg could maintain steady at 85% in 45min when the concentrations of CoFeO and PMS were 0.288g/L and 3.5mmol/l respectively, solution pH was 7 and reaction temperature was 55°C. In order to speculate the reaction mechanism, ethyl alcohol and isopropyl alcohol were used as the quenching agents to indirectly prove the existence of SO and OH.
采用溶胶-凝胶法制备了磁性钴铁氧体（CoFeO）催化剂，并通过 X 射线衍射（XRD）、扫描电子显微镜（SEM）、BET 和磁滞回线法进行了表征。通过 X 射线光电子能谱（XPS）分析了新鲜和用过的催化剂表面的化学状态。在实验室规模上，使用 CoFeO 催化的活性过氧单硫酸盐（PMS）进行了烟气中元素汞（Hg）去除实验，考察了催化剂用量、PMS 浓度、初始溶液 pH 值和反应温度对汞去除效率的影响。当 CoFeO 和 PMS 的浓度分别为 0.288g/L 和 3.5mmol/L、溶液 pH 值为 7 和反应温度为 55°C 时，Hg 的平均去除效率在 45min 内可稳定保持在 85%。为了推测反应机理，使用乙醇和异丙醇作为猝灭剂来间接证明 SO 和 OH 的存在。
