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SSRN 2023年

作者： Lv, Zhihui He, Guangzhi Ge, Yanli Liu, Yongchun Yu, Yunbo He, Hong State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing100049 China State Key Joint Laboratory of Environmental Simulation and Pollution Control Beijing Innovation Center for Engineering Science and Advanced Technology College of Environmental Science and Engineering Peking University Beijing100871 China Aerosol and Haze Laboratory Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing100029 China Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341000 China Center for Excellence in Regional Atmospheric Environment Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China

Vanadia-based catalysts are widely applied in NOx reduction, while the promoting effect of WO3 and MoO3 is still under debate. Herein, we prepared V2O5/TiO2, V2O5-WO3/TiO2, and V2O5-MoO3/TiO2 catalysts and revealed that WO3 and MoO3 enhanced the activity of V2O5/TiO2, particularly under wet conditions. In situ DRIFTS, two-dimensional correlation spectroscopy (2D COS), and DFT calculations demonstrated that NH3 adsorption on Lewis acid sites of V2O5/TiO2 resulted in the formation of NH3ads-L1 (1284 cm-1, Ti sites of O=V-O-Ti) and NH3ads-L2 (1604 cm-1, V=O sites). By using 2D COS, we firstly found that the NH3ads-L1 exhibited higher reactivity towards NO to produce NH2NO* via NH2*, which was promoted by WO3. Moreover, WO3 and MoO3 doping inhibited H2O adsorption, and promoted its desorption at elevated temperature, thus protecting the V=O sites on V2O5/TiO2. Also, 2D COS analysis provides a new perspective for in-depth understanding of the active sites and intermediates in NH3-SCR reaction. © 2023, The Authors. All rights reserved.

关键词： Catalysts

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Effects of Wo3 and Moo3 Loadings on Vanadia-Based Catalysts for Nh3-Scr: Revealed by in Situ Infrared and Two-Dimensional Correlation Spectroscopy

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SSRN 2023年

Vanadia-based catalysts have been widely applied in NOx reduction, while the promoting effects of WO3 and MoO3 are still under debate. Herein, we prepared V2O5/TiO2, V2O5-WO3/TiO2, and V2O5-MoO3/TiO2 catalysts and revealed that WO3 and MoO3 enhanced the activity of V2O5/TiO2, especially under wet conditions. In situ DRIFTS, two-dimensional correlation spectroscopy (2D COS), and DFT calculations demonstrated that NH3 adsorbed on Lewis acid sites of V2O5/TiO2, resulting in the formation of NH3ads-L1 (1284 cm-1, Ti sites of O=V-O-Ti) and NH3ads-L2 (1604 cm-1, V=O sites). By using 2D COS, we found that the NH3ads-L1 exhibited higher reactivity towards NO to produce NH2NO* via NH2*, which was promoted by WO3. Moreover, WO3 and MoO3 doping inhibited H2O adsorption, and promoted its desorption by increasing temperature, thus protecting the V=O sites on V2O5/TiO2. Also, 2D COS provided a new perspective for in-depth understanding of the active sites and intermediates in the NH3-SCR reaction. © 2023, The Authors. All rights reserved.

关键词： Catalysts

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Accelerated activation of ozone on Fe-doped MnO 2 for highly efficient ozone catalytic oxidation of ethyl acetate

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Journal of environmental Sciences 2025年

作者： Ning Wu Ming Ouyang Lei Liu Chuying Qiu Ning Wang Peirong Chen Junliang Wu Xiaofei Song Mingli Fu Daiqi Ye School of Environment and Energy South China University of Technology Guangzhou 510006 China Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control Guangzhou 510006 China

Ozone catalytic oxidation (OCO) is a promising technology for controlling malodorous pollution, effectively removing low-concentration oxygenated volatile organic compounds (OVOCs) at low temperatures. However, the catalytic performance of manganese oxides remains constrained by insufficient reactive oxygen species (ROS) and high humidity, particularly at low temperatures. To address this, a series of MMnO 2 catalysts were successfully prepared by introducing highly dispersed transition metals (M = Fe, Ce, Mo) into MnO 2 via an in-situ hydrothermal method, aiming to improve low-temperature performance. Among these catalysts, the FeMnO₂ catalyst exhibited the highest catalytic performance, achieving 100 % conversion of 30 ppm ethyl acetate (EA) and a 92.78 % mineralization rate at 70°C, along with exceptional stability and water resistance (12.8 vol.%). In situ characterization techniques have demonstrated that the introduction of Fe significantly weakens the strength of the Mn−O bond in MnO 2 . The formation of abundant oxygen vacancies facilitates the adsorption and activation of O 3 . Both 1 O 2 and •O 2 − species serve as crucial ROS, promoting the effective mineralization of EA on the catalyst surface and reducing the generation of reaction intermediates. This study provides a significant foundation for the further development of catalysts targeting low-concentration OVOCs and for enhancing the practical low-temperature catalytic activity of transition metal oxides.

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Enhanced Mobility and Stability of Nanoscale Zero-Valent Iron for as Contaminated Groundwater Remediation

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SSRN 2023年

作者： Jiang, Jun Lv, Hua-Gang Li, Meng-Li He, Yong Tang, Lu Liu, Hong-Yu Liang, Ying Xue, Sheng-Guo School of Metallurgy and Environment Central South University Hunan Changsha410083 China Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution Central South University Hunan Changsha410083 China Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Central South University Ministry of Education Changsha410083 China

Nanoscale zero-valent iron (nZVI) is a promising reagent for in situ remediations to transform groundwater contaminants into non-toxic compounds, but its utility in practical projects is limited by the poor radius of influence and rapid deactivation.. Herein, stabilized nZVIs are assembled with carboxymethyl cellulose (CMC)/ sodium dodecyl sulfate (SDS) and surface-modified carbon black (CB) to manipulate the charge, electron, and geometric structure of the interface to facilitate the transport property. The As(III) removal capacity and the effect of input velocity and iron strength on the transport and deposition behaviors of stabilized nZVIs in the aquifer filled with clayey soil are investigated. The optimal Fe/CB/CMC (wt.%=1:1:2) and Fe/CB/SDS (wt.%=1:2:1) suspensions display excellent As(Ⅲ) removal capacities of 80.7 and 90.7 mg g-1. Fe/CB/CMC-112 was more mobile than Fe/CB/SDS-121, that 74.81% and 81.95% of nZVI retained in the soil column, respectively. The high recoveries of stabilized nZVI with contaminated soil, lower input velocity, and higher ionic strength were tested, illustrating a significant impact of realistic chemical and hydrological conditions of the filling medium on the deposition of nZVI. This study demonstrates the feasibility of combining anionic surfactants and carbon supports to enhance the stability and mobility of nZVI for in situ remediations. © 2023, The Authors. All rights reserved.

关键词： Carbon black

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Construction of Z-scheme heterojunction CoWO4/Bi4O5I2 for enhanced visible-light-driven degradation of levofloxacin

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Surfaces and Interfaces 2025年 70卷

作者： Dong, Yi Xu, Jingjing Chen, Mindong Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and Engineering Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Engineering Technology Research Center of Environmental Cleaning Materials Nanjing University of Information Science and Technology Nanjing China

This study aims to develop highly efficient photocatalytic materials to tackle environmental pollution. The construction of Z-scheme heterojunctions with excellent redox properties shows great potential. In this context, we have successfully synthesized a novel Z-scheme CoWO4/Bi4O5I2 (BIC-X) heterojunction photocatalyst using an in-situ calcination method. The as-synthesized BIC-X samples were systematically assessed for their photocatalytic efficiency in degrading levofloxacin (LOFX) under visible-light exposure. Under visible light, the optimal sample, BIC-2, achieved an 86.3% degradation efficiency for LOFX within 40 min. The corresponding degradation rate constant (k) value was 3.33-fold and 42.73-fold greater than those of standalone Bi4O5I2 and CoWO4. This study confirms that the prepared photocatalyst exhibits high degradation efficiency towards LOFX under neutral and weakly alkaline conditions. Moreover, the presence of Na⁺, Cl^-, K⁺, and humic acid does not significantly affect its activity. The photocatalyst also maintains good degradation performance in simulated seawater, indicating its applicability in complex aqueous environments. The superior photocatalytic activity is due to two synergistic mechanisms: the optimized spatial separation and migration of photogenerated charge carriers, and the suppression of carrier recombination by the Z-scheme heterojunction. Moreover, active species scavenging experiments, EPR, and band structure analysis revealed that the predominant reactive species were electrons (e^-), holes (h⁺), and superoxide radicals (•O2^-). The intermediate products generated during the degradation of levofloxacin were identified using liquid chromatography-mass spectrometry (LC-MS), and their toxicity was subsequently evaluated. Based on these findings, a direct Z-scheme photocata

关键词： Bi4O5I2 CoWO4 Photocatalysis Visible light Z-scheme heterojunction

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Polycyclic Aromatic Hydrocarbons in Fildes Peninsula, Maritime Antarctica: Effects of Human Disturbance

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SSRN 2022年

作者： Wu, Zilan Lin, Tian Sun, Hao Li, Ruijing Liu, Xing Guo, Zhigang Ma, Xindong Yao, Ziwei State Environmental Protection Key Laboratory of Coastal Ecosystem National Marine Environmental Monitoring Center Dalian116023 China College of Marine Ecology and Environment Shanghai Ocean University Shanghai201306 China Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Institute of Atmospheric Sciences Department of Environmental Science and Engineering Fudan University Shanghai200433 China

The Fildes Peninsula in the Antarctic Peninsula represents a priority area of surging anthropogenic perturbance and thereby is beset with native contamination of polycyclic aromatic hydrocarbons (PAHs). Based on the 29 th Chinese Antarctic Expedition, this study provides the first data on the distribution and transport dynamics of PAHs via summertime analyses of lakes, seawater, snow, and air. High PAH concentrations in marine and terrestrial environmental matrices and similar composition profiles (dominance of two- and three-ring PAHs) indicated substantial primary emissions of petrogenic PAHs. This result was corroborated by nonequilibrium partitioning of atmospheric PAHs and air mass movement trajectories. Notable geographical disparities of PAH pollution in the various types of samples consistently suggested impacts of station-related activities, rather than long-range atmospheric transport, on PAHs. During the austral summer, the lack for temperature dependence for gas-phase concentrations and diagnostic ratios of PAHs demonstrated that the impact of local anthropogenic inputs in air PAH variability supersedes the re-emission effect. The derived air–water and air–snow exchanges of PAHs in this remote region indicated a disequilibrium state. PAH outgassing from, and absorption into, lake and marine waters were both observed, probably due to differences in anthropogenic influences among sites, while the net deposition of gaseous PAHs into snow prevailed. Under the circumstances of declining global PAH emissions and climate change, the footprint and fate of PAHs in Fildes Peninsula merits comprehensive monitoring. © 2022, The Authors. All rights reserved.

关键词： Polycyclic aromatic hydrocarbons

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The Intersection between Materials Science and environmental Applicability: Defining the Scope of ES&T for Materials-Based Research

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environmentAL SCIENCE & TECHNOLOGY 2023年第33期57卷 12135-12136页

作者： Wang, Peng Rosario-Ortiz, Fernando Giammar, Dan He, Hong Lowry, Greg Waite, David Westerhoff, Paul Zimmerman, Julie School of Environmental Science and Engineering Sun Yat-sen University Guangzhou 510275 P. R. China Department of Civil Environmental and Architectural Engineering Environmental Engineering Program University of Colorado Boulder Colorado 80309 United States Department of Energy Environmental and Chemical Engineering Washington University in St. Louis St. Louis Missouri 63130 United States Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China University of Chinese Academy of Sciences Beijing 100049 China Department of Civil and Environmental Engineering Carnegie Mellon University Pittsburgh Pennsylvania 15213 United States School of Civil and Environmental Engineering University of New South Wales Sydney NSW 2052 Australia School of Sustainable Engineering and the Built Environment Arizona State University Tempe Arizona 85287 United States School of Forestry and Environmental Studies Department of Chemical and Environmental Engineering Yale University New Haven Connecticut 06511 United States

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Metals Incorporated into Oms-2 Lattice Create Flexible Catalysts with Highly Efficient Activity in Vocs Combustion

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SSRN 2022年

作者： Deng, Hua Lu, Yuqin Pan, Tingting Wang, Lian Zhang, Changbin He, Hong Center for Excellence in Regional Atmospheric Environment Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China University of Chinese Academy of Sciences Beijing100049 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China

Catalytic combustion of different types of VOCs with various functional groups generally requires certain catalysts with high efficiency. Here, a novel manganese oxide catalyst was tuned via incorporation of small amounts of different metals, exhibiting flexible activity in abatement of different VOC species. XRD, Raman, TEM, Mapping images and ICP-OES combined with DFT calculations demonstrated that Ce, Ir, Pd, Cu and Fe were incorporated into OMS-2 by substituting for Mn on octahedral sites, and Ag could be stabilized in the tunnel of OMS-2 via replacing K ions. Pd-OMS-2 and Ag-OMS-2 exhibited excellent activity in catalytic oxidation of toluene due to the improved reducibility and mobility of oxygen. Cu ions improved the scission of C-C bonds in acetone and Ir ions facilitated the cleavage of the C-Cl bond in dichloromethane, all of which contributed to their highly specific activity in removal of the corresponding VOCs. © 2022, The Authors. All rights reserved.

关键词： Catalytic oxidation

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Enhanced As(Iii) Detection Under Near-Neutral Conditions: Synergistic Effect of Boosted Adsorption by Oxygen Vacancies and Valence Cycle Over Activated AU Nps Loaded on Fecoox Nanosheets

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SSRN 2023年

作者： Huang, Xing-Jiu Huang, Cong-Cong Song, Zong-Yin Li, Hui-Quan Yu, Xin-Yu Cui, Yu-Min Yang, Meng Key Laboratory of Environmental Optics and Technology And Environmental Materials and Pollution Control Laboratory Institute of Solid State Physics HFIPS Chinese Academy of Sciences Hefei230031 China Department of Materials Science and Engineering University of Science and Technology of China Hefei230026 China Anhui Provincial Key Laboratory for Degradation and Monitoring of Pollution of the Environment School of Chemistry and Materials Engineering Fuyang Normal University Fuyang236037 China Anhui Haoyuan Chemical Group Co. Ltd. Fuyang236146 China

It is reported that As(III) has always been detected in acidic environments. Nevertheless, the unstable modified nanomaterials under strong acidic conditions may lead to unreliable results. Herein, an innovative method is proposed to employ FeCoOx nanosheets with abundant oxygen vacancies to stabilize even activate Au NPs for enhancing As(III) detection under mild conditions synergistically. Specifically, the sensitivity of 1.45 μA ppb-1 with a detection limit (3σ method) of 0.27 ppb were obtained, which displays a promising application in the field of electrochemical detection. Moreover, the suggested electrode represented stable detection for As(III) in repetitive measurements (RSD=2.60%, n=10), and the ideal anti-interference performance was demonstrated. It is revealed that FeCoOx nanosheets with extensive interfacial area and the introduced oxygen vacancies afforded plentiful active sites for As(III) adsorption as well as assisted to stabilize Au NPs for uniform dispersion. Meanwhile, the valence cycle activated Au NPs and accelerated the transfer of electrons, which further synergies to boost the electro-catalysis of As(III). This study is not only favorable for understanding the positive facilitation of oxygen vacancies and the valence cycle of transition metals on catalytic performance;but also gives guidelines for constructing a novel electrochemical sensing interface. © 2023, The Authors. All rights reserved.

关键词： Oxygen vacancies

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Co3O4 Polyhedron@MnO2 Nanotube Composite as Anode for High-Performance Lithium-Ion Batteries

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Small 2021年第19期17卷 e2008165页

作者： Cao, Zhiguang Yang, Yuebei Qin, Junling He, Jieying Su, Zixue School of Environment and Energy South China University of Technology Guangzhou510006 China Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control South China University of Technology Guangzhou510006 China

In this work, a novel lollipop nanostructure of Co3O4@MnO2 composite is prepared as anode material in lithium-ion batteries (LIBs). Cobalt metal–organic framework (ZIF-67) is grown on the open end of MnO2 nanotubes via a self-assembly process. The obtained ZIF-67@MnO2 is then converted to Co3O4@MnO2 by a simple annealing treatment in air. Scanning electron microscopy, transmission electron microscopy, and X-ray diffraction characterizations indicate that the prepared Co3O4@MnO2 takes a lollipop nanostructure with a stick of ≈100 nm in diameter, consisting of MnO2 nanotube, and a head part of ≈1 µm, consisting of Co3O4 nanoparticles. The charge–discharge tests illustrate that this unique novel configuration endows the resulting Co3O4@MnO2 with excellent electrochemical performances, delivering a capacity of 1080 mAh g−1 at 300 mA g−1 after 160 cycles, and 696 mAh g−1 at 1 A g−1 after 210 cycles, compared with 404 mAh g−1 and 590 for pure Co3O4 polyhedrons and pure MnO2 nanotubes at 300 mA g−1 after 160 cycles, respectively. The lollipop configuration consisting of porous Co3O4 polyhedron and MnO2 nanotube shows excellent structural stability and facilitates lithium insertion/extraction, leading to excellent cyclic stability and rate capacity of Co3O4@MnO2-based LIBs. © 2021 Wiley-VCH GmbH

关键词： High resolution transmission electron microscopy

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