title: Removal of aqueous oxalic acid by heterogeneous catalytic ozonation with MnOx/sewage sludge-derived activated carbon as catalysts.
abstract: MnOx/sewage sludge-derived activated carbon (MnOx/SAC) was prepared as catalysts to improve the performance of aqueous oxalic acid degradation by ozonation. The results indicated that MnOx/SAC had excellent catalytic activity in mineralization of oxalic acid during heterogeneous catalytic ozonation process. MnOx/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.
authors.affiliation: School of Environment and Architecture, University of Shanghai for Science and Technology, No. 516, Jungong Road, Shanghai 200093, China.
authors.forename: Yuanxing
authors.initials: Y
authors.lastname: Huang
authors.affiliation: School of Environment and Architecture, University of Shanghai for Science and Technology, No. 516, Jungong Road, Shanghai 200093, China.
authors.forename: Yaru
authors.initials: Y
authors.lastname: Sun
authors.affiliation: School of Environment and Architecture, University of Shanghai for Science and Technology, No. 516, Jungong Road, Shanghai 200093, China.
authors.forename: Zhihua
authors.initials: Z
authors.lastname: Xu
authors.affiliation: School of Environment and Architecture, University of Shanghai for Science and Technology, No. 516, Jungong Road, Shanghai 200093, China.
authors.forename: Mengyu
authors.initials: M
authors.lastname: Luo
authors.affiliation: Qinhuangdao Qinre Power Generation Co., Ltd., Qinhuangdao, Hebei 066003, China.
authors.forename: Chunlei
authors.initials: C
authors.lastname: Zhu
authors.affiliation: School of Environment and Architecture, University of Shanghai for Science and Technology, No. 516, Jungong Road, Shanghai 200093, China. Electronic address: liliang@usst.edu.cn.
authors.forename: Liang
authors.initials: L
authors.lastname: Li
keywords: Heterogeneous catalytic ozonation; MnO(x)/sewage sludge-derived activated carbon; Oxalic acid; Sewage sludge