MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China.
MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China.
Environ Pollut. 2019 Jun;249:868-877. doi: 10.1016/j.envpol.2019.03.103. Epub 2019 Mar 29.
The cobalt ferrite-reduced oxidized graphene (CoFeO/rGO) catalyst was synthesized by hydrothermal method and characterized by Powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Scanning electron microscope (SEM), Brunauere Emmette Teller (BET) and Hysteresis loop. For developing a new method of removing elemental mercury (Hg) from flue gas, the effects of catalyst dosage, PMS concentration, solution pH and reaction temperature on the removal efficiency were investigated experimentally by using peroxymonosulfate (PMS) catalyzed by CoFeO/rGO at a self-made bubbling reactor. The average removal efficiency of Hg in a 30-min period reached 95.56%, when CoFeO/rGO dosage was 0.288 g/L, PMS concentration was 3.5 mmol/L, solution pH was 5.5 and reaction temperature was 55 °C. Meanwhile, based on the free radical quenching experiments, in which, ethyl alcohol and tert butyl alcohol were used as quenchers to prove indirectly the presence of OH and SO, the characterizations of catalysts and reaction products, and the existing results from other scholars. The reaction mechanism was proposed.
钴铁氧体还原氧化石墨烯（CoFeO/rGO）催化剂采用水热法合成，并通过粉末 X 射线衍射（XRD）、X 射线光电子能谱（XPS）、扫描电子显微镜（SEM）、Brunauer-Emmette-Teller（BET）和磁滞回线进行了表征。为开发一种从烟气中去除元素汞（Hg）的新方法，通过在自制鼓泡反应器中使用 CoFeO/rGO 催化过一硫酸盐（PMS），实验研究了催化剂用量、PMS 浓度、溶液 pH 值和反应温度对去除效率的影响。当 CoFeO/rGO 用量为 0.288 g/L、PMS 浓度为 3.5 mmol/L、溶液 pH 值为 5.5 和反应温度为 55°C 时，在 30 分钟的时间内，Hg 的平均去除效率达到 95.56%。同时，基于自由基猝灭实验，其中使用乙醇和叔丁醇作为猝灭剂来间接证明 OH 和 SO 的存在、催化剂和反应产物的特性，以及其他学者的现有结果，提出了反应机理。
