School of Environment and Architecture, University of Shanghai for Science and Technology, No. 516, Jungong Road, Shanghai 200093, China.
Qinhuangdao Qinre Power Generation Co., Ltd., Qinhuangdao, Hebei 066003, China.
Sci Total Environ. 2017 Jan 1;575:50-57. doi: 10.1016/j.scitotenv.2016.10.026. Epub 2016 Oct 8.
MnO/sewage sludge-derived activated carbon (MnO/SAC) was prepared as catalysts to improve the performance of aqueous oxalic acid degradation by ozonation. The results indicated that MnO/SAC had excellent catalytic activity in mineralization of oxalic acid during heterogeneous catalytic ozonation process. MnO/SAC with a manganese load of 30% exhibited the strongest catalytic activity under the condition of solution pH3.5, which enhanced the oxalic acid removal from 10.3% to 92.2% in 60min compared with that treated by ozone alone. Increase of catalyst dosage and aqueous ozone concentration was advantageous for oxalic acid removal from water. On the basis of catalyst characterization analysis and the observation of inhibitory effect induced by higher pH, less catalyst dosage as well as the presence of hydroxyl radical scavenger, it was deduced that the reaction mechanism involved both hydroxyl radicals attack and surface reactions.
MnO/污水污泥衍生的活性炭 (MnO/SAC) 被制备为催化剂，以提高臭氧氧化法处理水中草酸的性能。结果表明，MnO/SAC 在多相催化臭氧氧化过程中对草酸的矿化具有优异的催化活性。在溶液 pH3.5 的条件下，负载 30%锰的 MnO/SAC 表现出最强的催化活性，与单独臭氧处理相比，在 60min 内将草酸的去除率从 10.3%提高到 92.2%。增加催化剂用量和水相臭氧浓度有利于从水中去除草酸。基于催化剂表征分析和观察到的高 pH 值、较低催化剂用量以及羟基自由基清除剂的存在所引起的抑制效应，推断反应机制涉及羟基自由基攻击和表面反应。
