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simultaneous oxidation of Mn (Ⅱ) and As (Ⅲ) on cupric oxide (CuO) promotes As (Ⅲ) removal at circumneutral pH

Journal of Environmental Sciences 2023年第3期125卷 691-700页

作者： Lingqun Zeng Biao Wan Qian Wang Yupeng Yan Yuanzhi Tang Xionghan Feng State Environmental Protection Key Laboratory of Soil Health and Green Remediation College of Resources and EnvironmentHuazhong Agricultural UniversityWuhan 430070China School of Earth and Atmospheric Sciences Georgia Institute of TechnologyAtlantaGA 30332-0340USA Department of Environmental and Sustainable Engineering University at AlbanySUNY1400 Washington AvenueAlbanyNY 12222USA Geomicrobiology Center for Applied GeosciencesUniversity of Tuebingen72076 TuebingenGermany. Key Laboratory of Poyang Lake Watershed Agricultural Resources and Ecology of Jiangxi Province College of Land Resources and EnvironmentJiangxi Agricultural UniversityNanchang 330045China

oxidation of Mn (Ⅱ) or As(Ⅲ) by molecular oxygen is slow at pH<9,while they can be catalytically oxidized in the presence of oxide minerals and then removed from contaminated ***,the reaction mechanisms on simultane... 详细信息

oxidation of Mn (Ⅱ) or As(Ⅲ) by molecular oxygen is slow at pHsimultaneous oxidation of Mn(Ⅱ) and As (Ⅲ)on oxide mineral surface and their accompanied removal efficiency remain *** study compared Mn (Ⅱ) oxidation on four common metal oxides (γ-Al_(2)O_(3),CuO,α-Fe2O_(3)and ZnO) and investigated the simultaneous oxidation and removal of Mn (Ⅱ) and As (Ⅲ) through batch experiments and spectroscopic *** the tested oxides,CuO and α-Fe2O_(3)possess greater catalytic activity toward Mn (Ⅱ) *** and removal kinetics of Mn (Ⅱ) and As (Ⅲ) on CuO indicate that O_(2)is the terminal electron acceptor for Mn (Ⅱ) and As (Ⅲ) oxidation on CuO,and Mn (Ⅱ) acts as an electron shuttle to promote As (Ⅲ) oxidation and *** main oxidized product of Mn (Ⅱ) on CuO is high-valent MnO_(x)*** newly formed Mn (Ⅲ) or Mn (IV) phases promote As (Ⅲ) oxidation on CuO at circumneutral pH 8 and is reduced to Mn (Ⅱ),which may be then released into *** study provides new insights into metal oxide-catalyzed oxidation of pollutants Mn (Ⅱ) and As (Ⅲ) and suggests that CuO should be considered as an efficient material to remediate Mn (Ⅱ) and As(Ⅲ)contamination.

关键词： simultaneous oxidation Mn(II) As(III) CuO Metal oxides

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