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Catalytic activity of manganese oxide supported on alumina in the synthesis of quinoxalines

Rekha M., H. Kathyayini, N. Nagaraju

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 4,   Pages 415-421 doi: 10.1007/s11705-013-1360-3

Abstract: Two catalysts, alumina and manganese oxide supported on alumina, have been prepared by calcination and

Keywords： alumina     manganese oxide deposited on alumina     quinoxaline synthesis    

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Interlayer-confined two-dimensional manganese oxide-carbon nanotube catalytic ozonation membrane for

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 5,   Pages 731-744 doi: 10.1007/s11705-021-2110-6

Abstract: Catalytic ozonation technology has attracted copious attention in water purification owing to its favorable oxidative degradation of pollutants and mitigation of membrane fouling capacity. However, its extensive industrial application has been restricted by the low ozone utilization and limited mass transfer of the short-lived radical species. Interlayer space-confined catalysis has been theoretically proven to be a viable strategy for achieving high catalytic efficiency. Here, a two-dimensional MnO2-incorporated ceramic membrane with tunable interspacing, which was obtained via the intercalation of a carbon nanotube, was designed as a catalytic ozonation membrane reactor for degrading methylene blue. Benefiting from the abundant catalytic active sites on the surface of two-dimensional MnO2 as well as the ultralow mass transfer resistance of fluids due to the nanolayer confinement, an excellent mineralization effect, i.e., 1.2 mg O3(aq) mg–1 TOC removal (a total organic carbon removal rate of 71.5%), was achieved within a hydraulic retention time of 0.045 s of pollutant degradation. Further, the effects of hydraulic retention time and interlayer spacing on methylene blue removal were investigated. Moreover, the mechanism of the catalytic ozonation employing catalytic ozonation membrane was proposed based on the contribution of the Mn(III/IV) redox pair to electron transfer to generate the reactive oxygen species. This innovative two-dimensional confinement catalytic ozonation membrane could act as a nanoreactor and separator to efficiently oxidize organic pollutants and enhance the control of membrane fouling during water purification.

Keywords： catalytic membrane reactor     catalytic ozonation     nanoconfinement     two-dimensional manganese oxide    

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Chemical composition and formation mechanisms in the cathode-electrolyte interface layer of lithium manganeseoxide batteries from reactive force field (ReaxFF) based molecular dynamics

Sahithya REDDIVARI, Christian LASTOSKIE, Ruofei WU, Junliang ZHANG

Frontiers in Energy 2017, Volume 11, Issue 3,   Pages 365-373 doi: 10.1007/s11708-017-0500-8

Abstract: Lithium manganese oxide (LiMn O ) is a principal cathode material for high power and high energy densityExperimental observations indicate that the manganese content of the electrolyte increases as an electrochemicalcell containing LiMn O ages, suggesting that active material loss by dissolution of divalent manganeseTo improve the retention of manganese in the active material, it is key to understand the reactions thatinvestigate the reactions occurring at the LiMn O cathode surface and the mechanisms that lead to manganese

Keywords： lithium manganese oxide batteries     reactive force field (ReaxFF)     cathode-electrolyte interface layer     molecular    

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Simultaneous enhanced ammonia and nitrate removal from secondary effluent in constructed wetlands using a new manganese-containing

Frontiers of Environmental Science & Engineering 2023, Volume 18, Issue 4, doi: 10.1007/s11783-024-1807-4

Abstract:

● MnO2/PCL composite material (MPCM) enhances ammonia and nitrate removal in CWs.

Keywords： Constructed wetland     Nitrogen removal     Manganese redox     Polycaprolactone     Nitrous oxide    

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Comparing the adsorption behaviors of Cd, Cu and Pb from water onto Fe-Mn binary oxide, MnO

Wei XU,Huachun LAN,Hongjie WANG,Hongming LIU,Jiuhui QU

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 3,   Pages 385-393 doi: 10.1007/s11783-014-0648-y

Abstract: The adsorption potential of FMBO, FeOOH, MnO for the removal of Cd , Cu and Pb in aqueous systems was investigated in this study. Comparing to FMBO and FeOOH, MnO offered a much higher removal capacity towards the three metal ions. The maximal adsorption capacity of MnO for Cd , Cu and Pb were 1.23, 2.25 and 2.60 mmol·g , respectively. And that for FMBO were 0.37, 1.13, and 1.18 mmol·g and for FeOOH were 0.11, 0.86 and 0.48 mmol·g , respectively. The adsorption behaviors of the three metal ions on the three adsorbents were all significantly affected by pH values and heavy metal removal efficiency increased with pH increased. The Langmuir and Freundlich adsorption models were used to describe the adsorption equilibrium of the three metal ions onto the three adsorbents. Results showed that the adsorption equilibrium data fitted well to Langmuir isotherm and this indicated that adsorption of metal ions occurred on the three metal oxides adsorbents limited to the formation of a monolayer. More negative charged of MnO surface than that of FMBO and FeOOH could be ascribed by lower pH of MnO than that of FMBO and FeOOH and this could contribute to more binding sites on MnO surface than that of FMBO and FeOOH. The higher metal ions uptake by MnO than FMBO and FeOOH could be well explained by the surface charge mechanism.

Keywords： heavy metals     Fe-Mn binary oxide     manganese dioxide     ferric hydroxide     adsorption    

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Efficient base-free oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid over copper-doped manganeseoxide nanorods with

Feng Cheng, Dongwen Guo, Jinhua Lai, Meihui Long, Wenguang Zhao, Xianxiang Liu, Dulin Yin

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 4,   Pages 960-968 doi: 10.1007/s11705-020-1999-5

Abstract: 2,5-Furandicarboxylic acid (FDCA) is an important and renewable building block and can serve as an alternative to terephthalic acid in the production of bio-based degradable plastic. In this study, Cu-doped MnO  nanorods were prepared by a facile hydrothermal redox method and employed as catalysts for the selective oxidation of 5-hydroxymethylfurfural (HMF) to FDCA using -butyl hydroperoxide (TBHP) as an oxidant. The catalysts were characterized using X-ray diffraction analysis, Fourier transform infrared spectroscopy, thermogravimetric analysis, and transmission electron microscopy. The effects of oxidants, solvents, and reaction conditions on the oxidation of HMF were investigated, and a reaction mechanism was proposed. Experimental results demonstrated that 99.4% conversion of HMF and 96.3% selectivity of FDCA were obtained under suitable conditions, and -butanol was the most suitable solvent when TBHP was used as an oxidant. More importantly, the Cu-doped MnO catalyst can maintain durable catalytic activity after being recycled for more than ten times.

Keywords： 5-hydroxymethylfurfural     25-furandicarboxylic acid     selective oxidation     Cu-doped MnO2     biomass transformation    

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Preparation of lithium ion-sieve and utilizing in recovery of lithium from seawater

Lu WANG, Changgong MENG, Wei MA

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 1,   Pages 65-67 doi: 10.1007/s11705-009-0105-9

Abstract: ion-sieve is a kind of special absorbent which has high selectivity for Li , especially the spinel manganese

Keywords： lithium     ion-sieve     seawater     spinel manganese oxide    

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Effects of humic acid and surfactants on the aggregation kinetics of manganese dioxide colloids

Xiaoliu HUANGFU,Yaan WANG,Yongze LIU,Xixin LU,Xiang ZHANG,Haijun CHENG,Jin JIANG,Jun MA

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 1,   Pages 105-111 doi: 10.1007/s11783-014-0726-1

Abstract: The aggregation of common manganese dioxide (MnO ) colloids has great impact on their surface reactivity

Keywords： humic acid     surfactant     aggregation kinetics     drinking water     manganese dioxide colloids    

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Dendritic BiVO4 decorated with MnOx co-catalyst as an efficient hierarchical catalyst for photocatalytic ozonation

Jin Yang, Xuelian Liu, Hongbin Cao, Yanchun Shi, Yongbing Xie, Jiadong Xiao

Frontiers of Chemical Science and Engineering 2019, Volume 13, Issue 1,   Pages 185-191 doi: 10.1007/s11705-018-1713-z

Abstract: An appropriate co-catalyst can significantly promote the photocatalytic efficacy, but this has been seldom studied in the visible-light photocatalysis combined with ozone, namely photocatalytic ozonation. In this work, a dendritic bismuth vanadium tetraoxide (BiVO ) material composited with highly dispersed MnO nanoparticles was synthesized, and its catalytic activity is 86.6% higher than bare BiVO in a visible light and ozone combined process. Catalytic ozonation experiments, ultra-violet-visible (UV-Vis) diffuse reflectance spectra and photoluminescence spectra jointly indicate that MnO plays a triple role in this process. MnO strengthens the light adsorption and promotes the charge separation on the composite material, and it also shows good activity in catalytic ozonation. The key reactive species in this process is ·OH, and various pathways for its generation in this process is proposed. This work provides a new direction of catalyst preparation and pushes forward the application of photocatalytic ozonation in water treatment.

Keywords： manganese oxide     bismuth vanadium tetraoxide     photocatalytic ozonation     hydroxyl radical     co-catalyst    

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Tripotassium citrate monohydrate derived carbon nanosheets as a competent assistant to manganese dioxide

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 3,   Pages 420-432 doi: 10.1007/s11705-021-2065-7

Abstract: Subsequently, a well-designed manganese dioxide/carbon nanosheets composite was synthesized through hydrothermalThe carbon nanosheets served as the substrate for growing the manganese dioxide, regulating its distributionMany manganese dioxide nanosheets grew vertically on the numerous functional groups generated on theFinally, an asymmetric supercapacitor with active carbon as the cathode and manganese dioxide/carbonThis study may provide valuable insights for applying carbon materials and manganese dioxide in the energy

Keywords： carbon nanosheets     manganese dioxide     asymmetric supercapacitors     energy density     power density    

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Coextraction of vanadium and manganese from high-manganese containing vanadium wastewater by a solvent

Zishuai Liu, Yimin Zhang, Zilin Dai, Jing Huang, Cong Liu

Frontiers of Chemical Science and Engineering 2020, Volume 14, Issue 5,   Pages 902-912 doi: 10.1007/s11705-019-1887-z

Abstract: High-manganese containing vanadium wastewater (HMVW) is commonly produced during the vanadium extractionFor the precipitation process, 91.05% of manganese was recovered as MnCO which meets the III grade standard

Keywords： high-manganese containing vanadium wastewater     solvent extraction     carbonate precipitation     vanadium titano-magnetite    

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The role of manganese oxides in the activation of peroxymonosulfate (PMS)

Jianzhi Huang, Huichun Zhang

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 5, doi: 10.1007/s11783-019-1158-8

Abstract: Manganese oxides (MnOx) have been demonstrated to be effective materials to activate Oxone (i.e., PMS

Keywords： Peroxymonosulfate     Manganese oxides     Catalyst     Oxidant    

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Multivalent manganese oxides with high electrocatalytic activity for oxygen reduction reaction

Xiangfeng Peng, Zhenhai Wang, Zhao Wang, Yunxiang Pan

Frontiers of Chemical Science and Engineering 2018, Volume 12, Issue 4,   Pages 790-797 doi: 10.1007/s11705-018-1706-y

Abstract: The enhanced activity could be due to the coexistence of manganese ions with different valences, the

Keywords： oxygen reduction reaction     manganese oxides     mixed valences of manganese     oxygen adsorption     dielectric barrier    

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Catalytic oxidation of carbon monoxide, toluene, and ethyl acetate over the

Zhidan Fu, Lisha Liu, Yong Song, Qing Ye, Shuiyuan Cheng, Tianfang Kang, Hongxing Dai

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 2,   Pages 185-196 doi: 10.1007/s11705-017-1631-5

Abstract: The Pd catalyst supported on cryptomelane-type manganese oxide octahedral molecular sieve (OMS-2) were

Keywords： cryptomelane-type manganese oxide octahedral molecular sieve     oxygen mobility     reducibility     carbon monoxide    

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Occurance and control of manganese in a large scale water treatment plant

Youjun CHEN,Feng XIAO,Yongkang LIU,Dongsheng WANG,Ming YANG,Hua BAI,Jiong ZHANG

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 1,   Pages 66-72 doi: 10.1007/s11783-014-0637-1

Abstract: The continuous variations of dissolved oxygen (DO), manganese (Mn), pH, and their effect on manganeseManganese concentration increased from 0.1 to 0.4 mg·L under the condition that DO concentration decreasedThe different water treatment processes exhibited different efficiency on manganese removal.the suspended sludge, low elevation velocity in settling tank and slow filter rate, will benefit the manganeseDuring a high release of manganese in raw water, traditional coagulation-sedimentation and filtration

Keywords： manganese release     dissolved oxygen     settling filtration     pre-oxidation    

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Title Author Date Type Operation

Catalytic activity of manganese oxide supported on alumina in the synthesis of quinoxalines

Rekha M., H. Kathyayini, N. Nagaraju

Journal Article

Interlayer-confined two-dimensional manganese oxide-carbon nanotube catalytic ozonation membrane for

Journal Article

Chemical composition and formation mechanisms in the cathode-electrolyte interface layer of lithium manganeseoxide batteries from reactive force field (ReaxFF) based molecular dynamics

Sahithya REDDIVARI, Christian LASTOSKIE, Ruofei WU, Junliang ZHANG

Journal Article

Simultaneous enhanced ammonia and nitrate removal from secondary effluent in constructed wetlands using a new manganese-containing

Journal Article

Comparing the adsorption behaviors of Cd, Cu and Pb from water onto Fe-Mn binary oxide, MnO

Wei XU,Huachun LAN,Hongjie WANG,Hongming LIU,Jiuhui QU

Journal Article

Efficient base-free oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid over copper-doped manganeseoxide nanorods with

Feng Cheng, Dongwen Guo, Jinhua Lai, Meihui Long, Wenguang Zhao, Xianxiang Liu, Dulin Yin

Journal Article

Preparation of lithium ion-sieve and utilizing in recovery of lithium from seawater

Lu WANG, Changgong MENG, Wei MA

Journal Article

Effects of humic acid and surfactants on the aggregation kinetics of manganese dioxide colloids

Xiaoliu HUANGFU,Yaan WANG,Yongze LIU,Xixin LU,Xiang ZHANG,Haijun CHENG,Jin JIANG,Jun MA

Journal Article

Dendritic BiVO4 decorated with MnOx co-catalyst as an efficient hierarchical catalyst for photocatalytic ozonation

Jin Yang, Xuelian Liu, Hongbin Cao, Yanchun Shi, Yongbing Xie, Jiadong Xiao

Journal Article

Tripotassium citrate monohydrate derived carbon nanosheets as a competent assistant to manganese dioxide

Journal Article

Coextraction of vanadium and manganese from high-manganese containing vanadium wastewater by a solvent

Zishuai Liu, Yimin Zhang, Zilin Dai, Jing Huang, Cong Liu

Journal Article

The role of manganese oxides in the activation of peroxymonosulfate (PMS)

Jianzhi Huang, Huichun Zhang

Journal Article

Multivalent manganese oxides with high electrocatalytic activity for oxygen reduction reaction

Xiangfeng Peng, Zhenhai Wang, Zhao Wang, Yunxiang Pan

Journal Article

Catalytic oxidation of carbon monoxide, toluene, and ethyl acetate over the

Zhidan Fu, Lisha Liu, Yong Song, Qing Ye, Shuiyuan Cheng, Tianfang Kang, Hongxing Dai

Journal Article

Occurance and control of manganese in a large scale water treatment plant

Youjun CHEN,Feng XIAO,Yongkang LIU,Dongsheng WANG,Ming YANG,Hua BAI,Jiong ZHANG

Journal Article