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SSRN 2022年

作者： Yang, Huangsheng Fu, Qi Hou, Yu Yu, Jiaxing Tong, Yuanjun Li, Nan Zhong, Huajie Zhu, Fang Wang, Junhui Hao, Zhengping Ouyang, Gangfeng School of Chemistry Sun Yat-Sen University Guangdong Guangzhou510275 China School of Chemical Engineering and Technology Sun Yat-sen University Zhuhai519082 China National Engineering Laboratory for VOCs Pollution Control Material & Technology University of Chinese Academy of Sciences Beijing101408 China MOE Key Laboratory of Bioinorganic and Synthetic Chemistry China

Iron-based single-atom catalysts (SACs) have demonstrated excellent efficiency in peroxymonosulfate (PMS) activation to generate reactive oxygen species (ROS) for persistent pollutants removal. However, the broad practical application of SACs has been restricted by the inefficient utilization of the as-activated ROS due to their ultrafast self-quenching. Herein, single-atom Fe loaded N-doped carbon nanosheets (SAFe/CNS) were synthesized via a cocoon silk chemistry strategy. The SAFe/CNS exhibited ultrahigh specific surface area (1970 m2·g-1) which brought out a large adsorption capacity for organic pollutants, thereby effieffectively utilizing the vicinal as-generated active species. The degradation rate was 1.925 min-1, which is superior to most of reported Fe-based SACs and representative PMS activation methods. Theoretical and experimental results revealed that the electron transferring from Fe-N4 site to PMS made PMS a nucleophilic agent, which would be prone to attack another PMS molecule, arousing the formation of O2•-, and consequently generating 1O2 through disproportionation. © 2022, The Authors. All rights reserved.

关键词： Organic pollutants

High Performance Lithium Ion Battery Cathode Based a Reduced Holey Graphene Oxides from Spent Lithium Ion Batteries

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SSRN 2023年

作者： Min, WenLu Chen, Xianghong Huang, Shuhan Liao, Yunlong Lei, Yu Xu, Jiantie Liang, Zhiyong Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control National Engineering Laboratory for VOCs Pollution Control Technology and Equipment School of Environment and Energy South China University of Technology Guangzhou510640 China School of Physics and Optoelectronics South China University of Technology Guangzhou510640 China School of Automotive Engineering Guangdong Polytechnic of Industry and Commerce Guangzhou510510 China

The search of alternatives to the commercial electrodes is a key to the development of advanced lithium ion batteries (LIBs). Compared to extensive efforts and progress made on their anode applications for LIBs, the graphene and its derivatives as cathodes have attracted less concerns. Herein, a series of reduced holey graphene oxides (rhG-x) with different "worm-like" and holey structures were synthesized based on the modified Hummer’s treatment and thermal reduction of graphite anode from spent LIBs. Benefiting form the rhG-x annealed at x = 400 oC with approximate oxygen-containing groups and electronic conductivity, as well as the "worm-like" and holey structures, the rhG-400 as cathode for LIBs delivers a high reversible capacity (e.g., 109.5 mAh g−1 at 0.05 A g-1) and excellent rate capability (e.g., 72.2, 67.9, 52.2 and 37.2 mAh g−1 at 2, 5, 10 and 20 A g−1, respectively) and maintains an ultra-long cycling life over 2000 cycles with high reversible capacity of 137.4 mAh g–1. © 2023, The Authors. All rights reserved.

关键词： Graphene

Pt/CeO2 catalyst Prepared from Metal-organic Framework for Ethylbenzene Oxidation

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Pt/CeO2 catalyst Prepared from Metal-organic Framework for E...

第九届国际稀土开发与应用研讨会暨2019中国稀土学会学术年会

作者： SU Chunjing HUANGXiaojia JIANG Yiwen FU Mingli WEN William YE Daiqi School of Environment and Energy South China University of Technology National Engineering Laboratory for the technologies and Equipments of VOCs Control Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control Centre for Clean Environment and Energy Environmental Futures CentreSchool of EnvironmentGriffith University

Ethylbenzene, as a typical volatile organic pollutant, is currently widely used in the industry in China. Pt particles with different sizes of nanometers（1.8, 2.1, 2.5,3.0） were synthesized by ethylene glycol reduction method, and loaded onto CeO by adsorption method. The catalytic activity of Ethylbenzene via Pt/CeO was investigated. The physicochemical properties were characterized by XRD, TEM and XPS. The structure-effect relationship between catalyst structure and reactivity was studied. The effect of Pt particle size on the performance of Pt/CeO catalyzed ethylbenzene was clarified. It was observed by SEM and TEM that the morphology of the catalyst did not change after loading Pt, and the Pt particles were uniformly dispersed on the carrier. The Ethylbenzene activity test showed that the catalytic activity of Pt/CeO was closely related to the size of Pt particles[1]. When the Pt particle size was 1.8 nm, it exhibited the highest activity, T= 210 ℃. The superior catalytic oxidation activity of Pt/CeO at low temperature（210 ℃） may be related to the surface oxygen vacancy concentration. The surface exposed Pt atoms and surface oxygen vacancies may be the active sites for catalytic oxidation reaction.

关键词： Metal-Organic Frameworks Ethylbenzene Pt/CeO2 Oxygen vacancy Catalytic Oxidation

Microwave-assisted synthesis of bimetallic NiCo-MOF-74 with enhanced open metal site for efficient CO 2 capture

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Environmental Functional Materials

Environmental Functional materials 2022年第3期1卷 253-266页

作者： Changwei Chen Mohammadreza Kosari Meizan Jing Chi He State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an 710049 Shaanxi PR China Department of Chemical and Biomolecular Engineering Faculty of Engineering National University of Singapore 10 Kent Ridge Crescent 119260 Singapore Department of Chemistry Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education Tsinghua University Beijing PR China National Engineering Laboratory for VOCs Pollution Control Material & Technology University of Chinese Academy of Sciences Beijing 101408 PR China

Metal–organic frameworks (MOFs) containing two different inorganic metal nodes (known as bimetallic MOFs) could exhibit enhanced CO 2 adsorption compared to their monometallic counterparts. Herein, a series of bimetallic NiCo-MOF-74 synthesized by microwave-assisted method were investigated for CO 2 adsorption. It was revealed that narrow micropore channel with open metal site (OMS) of the bimetallic NiCo-MOF-74 influence CO 2 binding affinity and CO 2 /N 2 adsorption. The CO 2 uptake of Ni 1 Co 1 -MOF-74 at 0 °C and 1 bar (100 kPa) was 8.30 mmol g −1 which is higher than those of Ni-MOF-74 (3.99 mmol g −1 ), Ni 6 Co 1 -MOF-74 (3.62 mmol g −1 ), Ni 1 Co 6 -MOF-74 (6.40 mmol g −1 ) and Co-MOF-74 (5.03 mmol g −1 ). While this could be related to the high specific surface area of Ni 1 Co 1 -MOF-74, Ni 1 CO 2 -MOF-74 with relatively low specific surface areas still shows good CO 2 adsorption capacity up to 5.70 mmol/g, which is higher than those of adsorbents Ni-MOF-74, Ni 6 Co 1 -MOF-74 and Co-MOF-74, indicating that adsorption performance mainly relies on coordinated metals. Ni 1 Co 1 -MOF-74 showed remarkable recyclability performance, ranking selectivity of CO 2 /N 2 reach up to 34, and suitable isosteric heat (31–23 kJ mol −1 ), manifesting a great probability for industrial CO 2 capture. As revealed, incorporated Ni 2+ /Co 2+ nodes within Ni 1 Co 1 -MOF-74, which are acting as active and open sites for CO 2 capture, led to the synergetic effects comprising of micropores as well as dense dual-metal sites.

关键词： Bimetallic metal–organic frameworks NiCo-MOF-74 Microwave-assisted synthesis Open metal site CO 2 capture

Distribution Characteristics and Potential Risks of Bioaerosol in Waste Transfer Station

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SSRN 2022年

作者： Ma, Jiawei Han, Yunping Li, Lin Liu, Junxin State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing100049 China National Engineering Laboratory for VOCs Pollution Control Material & Technology University of Chinese Academy of Sciences Beijing101408 China

The waste transfer station (WTS) is an important link between the community and disposal terminals for municipal solid waste (MSW). While WTSs facilitate waste collection in communities, odorous gases and bioaerosols sometimes escape from them, negatively affecting their surroundings. In this study, the concentration, particle size distribution, pathogen population, and health risks of bioaerosols were analyzed at different locations in a transfer station. The results showed that the highest bioaerosol concentration was detected as 10,353 ± 3,701 CFU/m3, 5 m from the disposal site. A total of 53 bacterial and rickettsia pathogen species were detected, of which 39 were human pathogenic bacteria originating directly from the WTS. Health risk assessments indicated unacceptable levels of non-carcinogenic risk caused by bacterial aerosols for operational workers at the WTS work surface. In addition, bacterial aerosols may pose a severe health risk to children within a 15 m area of the WTS. The results of this study provide a scientific basis for the control and risk reduction of bioaerosols in solid *** waste transfer station (WTS) is an important link between the community and the disposal terminal for municipal solid waste (MSW). While WTSs facilitate waste collection in communities, odorous gases and bioaerosols sometimes escape from them, negatively impacting the surroundings. In this study, the concentration, particle size distribution, pathogen population, and health risks of bioaerosols at different locations of a transfer station were analysed. Results showed that the highest bioaerosol concentration was detected as 10,353 ± 3,701 CFU/m3, 5 m away from the disposal site. A total of 53 bacteria and rickettsia pathogen species were detected, of which 39 species were human pathogenic bacteria originating directly from the WTS. Health risk assessments indicated unacceptable levels of non-carcinogenic risk caused by bacterial aerosols to operational workers at th

关键词： Health risks

Enhanced Plasma-Catalytic Oxidation of Methanol Over Mof-Derived Ceo2 Catalysts with Exposed Active Sites

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SSRN 2022年

作者： Chen, Gui Mao, Mengqi Chen, Longwen Zhang, Guangyi Wang, Zikun Liu, Feng Ye, Daiqi Wu, Junliang School of Environment and Energy South China University of Technology Guangzhou510640 China College of Light Chemical Industry and Materials Engineering Shunde Polytechnic Foshan528333 China National Engineering Laboratory for VOCs Pollution Control Technology and Equipment SCUT Guangzhou510640 China

A series of CeO 2 -based catalysts synthesized by pyrolysis of Ce-MOF precursors under various calcination temperatures were combined with non-thermal plasma to evaluate the plasma-catalytic performance for methanol oxidation in details. The highest methanol conversion (100.0%), CO 2 selectivity (90.1%), CO x selectivity (97.7%) and ozone suppression were obtained in CeO 2 -300 that was pyrolyzed at 300°C. Various physicochemical property characterizations revealed that CeO 2 -300 possessed the highest specific surface area and the most oxygen vacancies. According to CH 3 OH-temperature programmed desorption, CeO 2 -300 catalyst displayed more exposed active sites for methanol adsorption and oxidation, which could principally contribute to the improved plasma-catalytic performance. In addition, ozone catalytic decomposition and oxidation experiments further suggested that CeO 2 -300 can provide abundant active sites for the conversion of ozone into active oxygen species on the catalyst surface and therefore promote the deep oxidation of methanol into CO 2 . Finally, plausible reaction mechanisms were proposed based on the results of in-situ diffuse reflectance infrared transform spectroscopy (DRIFTS) experiments. © 2022, The Authors. All rights reserved.

关键词： Cerium oxide

高效稳定钙钛矿太阳能电池中非晶和缺陷表面的重构

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Science China materials 2023年第4期66卷 1323-1331页

作者：谢江生赵生合杭鹏杰陈甜温彬尹奇欣韦世宸朱升财余学功秦敏超路新慧严克友许建斌高平奇 School of Materials Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107China Institute for Solar Energy Systems Guangdong Provincial Key Laboratory of Photovoltaic TechnologyState Key Laboratory of Optoelectronic Materials and TechnologiesSun Yat-sen UniversityGuangzhou 510275China Department of Electronic Engineering The Chinese University of Hong KongHong Kong 999077China State Key Laboratory of Silicon Materials and School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China School of Environment and Energy State Key Laboratory of Luminescent Materials and Devicesand National Engineering Laboratory for VOCs Pollution Control Technology and EquipmentSouth China University of TechnologyGuangzhou 510006China Department of Physics The Chinese University of Hong KongHong Kong 999077China

钙钛矿太阳能电池的表界面性质是影响器件效率和稳定性的关键性因素.本文中,我们首次发现空穴传输层中的添加剂4-叔丁基吡啶(tBP)可以将钙钛矿非晶态和缺陷表面层进行重结晶,并且钝化晶粒表面的缺陷位点.该重构可使钙钛矿的表面功函数增... 详细信息

钙钛矿太阳能电池的表界面性质是影响器件效率和稳定性的关键性因素.本文中,我们首次发现空穴传输层中的添加剂4-叔丁基吡啶(tBP)可以将钙钛矿非晶态和缺陷表面层进行重结晶,并且钝化晶粒表面的缺陷位点.该重构可使钙钛矿的表面功函数增大,降低了钙钛矿与空穴传输层之间的界面能级失配,提高了器件的光电压.进一步地,我们通过化学键合强度设计,开发了更有效的空穴传输层添加剂4-叔丁基哌啶(tBPp),它比tBP具有与钙钛矿表面缺陷位点更强的相互作用.得益于吸附能的增强,经tBPp重构的钙钛矿表面缺陷态密度降低,且在热、光、湿度的作用下稳定性更好.基于tBPp作为添加剂的钙钛矿电池最高效率达到了24.2%.在氮气气氛中进行最大功率点跟踪测试,未封装的设备在连续光照超过1200小时后几乎可以保持其初始效率.本工作全面揭示了空穴传输层中添加剂对于钙钛矿电池的效率和稳定性的重要性,并提供了系统和基础性理解.

关键词：钙钛矿太阳能电池最大功率点跟踪缺陷态密度空穴传输层键合强度高效稳定叔丁基表面层

Diffusion behavior and environmental impact of odorants and Tvocs detected in a wastewater treatment plant for collaborative leachate treatment in Northwest China

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Chemosphere 2024年 366卷 143561页

作者： Liao, Zilan Gao, Tong Li, Pengyu Zheng, Tianlong Li, Lin Li, Cui Wang, Wenwen Wang, Ying Liu, Junxin State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing100049 China National Engineering Laboratory for VOCs Pollution Control Material & Technology University of Chinese Academy of Sciences Beijing101408 China Internal Medicine Department Inner Mongolia Autonomous Region People's Hospital Hohhot010017 China

Wastewater treatment plants (WWTPs) are major sources of volatile gaseous compounds, especially in mixed-source systems such as domestic wastewater and landfill leachate. This study aimed to investigate the emission behavior and environmental impact of gaseous substances, such as hydrogen sulfide (H2S), ammonia (NH3), carbon sulfide (CS2), and phosphine (PH3), at a WWTP in Northwest China. Odorants were detected in the air surrounding the grid room (XGS), biochemical treatment tank (SHC), secondary sedimentation tank (ECC), and sludge dewatering room (NTS). For comparison, the upwind boundary (O-SF) and downwind boundaries (O-XF) monitoring points were used, with odor concentrations ranging from 3.95 to 725.27 odor units. The concentration ranges of the odorant substances were 5.27–88.69, 5.61–71.96, 5.70–32.63, and 0.12–5.87 mg/m3 for H2S, NH3, CS2, and PH3, respectively. Meteorological factors such as temperature, relative humidity, and wind speed and direction substantially influence odorant emissions. The concentrations of various odorants and volatile organic compounds (vocs) detected at the O-XF monitoring point were higher than those detected at the O-SF monitoring point, indicating that the wind intensified their diffusion toward the downwind plant boundary. The average odor intensities of odorant substances emitted from wastewater or sludge treatment equipment were 3.37, 5.09, 4.42, 2.00, and 3.82 for total vocs, H2S, NH3, CS2, and PH3, respectively. Among them four, with downwind diffusion, only H2S presented olfactory and chronic toxicity risks based on Gaussian plume model calculations. The hazard index ranking across monitoring sites was XGS > NTS > SHC > ECC > O-XF > O-SF. These findings emphasize the urgent need for effective measures to control and mitigate gaseous pollutants emitted by collaborative WWTPS, thereby protecting environmental quality and public health. © 2024 Elsevier Ltd

关键词： Leachate treatment

Unveiling the Unexpected C-C Dissociation Capacity and Intrinsic Mechanism of Undercoordinated Pd Cluster/Ceo2 for the Efficient and Stable Catalytic Mineralization of Propane

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SSRN 2022年

作者： Xia, Lianghui Jian, Yanfei Wang, Jingjing Wang, Yao Chai, Shouning Liu, Yujie Li, Lu Yu, Yanke Albilali, Reem He, Chi State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Shaanxi Xi’an710049 China Department of Chemistry College of Science Imam Abdulrahman Bin Faisal University P.O. Box 1982 Dammam31441 Saudi Arabia National Engineering Laboratory for VOCs Pollution Control Material & Technology University of Chinese Academy of Sciences Beijing101408 China

Light alkanes extensively presented in industrial exhausts have led tremendous harm to the atmospheric environment and human health. However, their stable molecule structure and inferior adsorption and activation efficiency make them as one category of the most intractable pollutants to be efficient controlled. Herein, we developed a Pd single cluster/CeO2 catalyst (Pd/CeO2-SCC-R) by a scalable deposition precipitation strategy, which demonstrates unexpected activity (propane total destructed below 300 oC) and thermal stability (even dramatically treated at 800 oC for multiple cycles) attributed to the strong metal-support interaction (SMSI) and unsaturated Pd metal sites caused by the shorter Pd-O distance. Mechanism studies determine that the Pd/CeO2-SCC-R possesses highly-efficient C-C cleavage ability owing to the persistent formation of large amounts of oxygen vacancies and low-coordinated Pd species, and the addition of H2O intrinsically accelerates propane activation and intermediate mineralization attributed to suppression of by-products by OH species. In comparison, the Pd single atom/CeO2 catalyst is preferentially for C-H bonds cleavage and inactive for C-C bonds cracking due to the saturated Pd sites anchored to the oxygen of supports directly, which generates more non-oxidation by-products as propyne and propylene, inhibiting the continuous decomposition of propane due to the retardatory oxidation of pyruvate species. The present work sheds critical insight to the production of fulfilling products through the directional cleavage of C-C/C-H bonds in the activation of light alkane molecules. © 2022, The Authors. All rights reserved.

关键词： Oxygen vacancies

Electrospinning Synthesis of Co3o4 Porous Nanofiber Monolithic Catalysts for the Room-Temperature Indoor Catalytic Oxidation of Formaldehyde at Low Concentrations

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SSRN 2023年

作者： Jiao, Yujun Jing, Cha Wang, Yuqin Yao, Fan Ye, Guangzheng Wang, Xiaohong Zhao, Guangyi Peng, Weixiao Huang, Haomin Ye, Daiqi School of Environment and Energy South China University of Technology Guangzhou510006 China National Engineering Laboratory for VOCs Pollution Control Technology and Equipment Guangzhou510006 China Guangzhou510006 China Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal South China University of Technology Guangzhou510006 China

Room-temperature catalytic oxidation is a highly promising method for controlling formaldehyde (HCHO) concentrations indoors because it does not require any additional energy input, while completely converting HCHO into harmless H2O and CO2. This study focuses on the synthesis of Co3O4 porous nanofiber monolithic catalysts through electrospinning and investigates the mechanism behind the formation of its porous structure by analyzing the morphological changes that occur during the calcination of its fibers. In this research, we utilized heat-resistant polyacrylonitrile (PAN) as template to synthesize Co3O4 porous nanofiber monolithic catalysts. The synthesis process involved the utilization of the oxidation characteristics of PAN in the presence of cobalt acetate tetrahydrate (CH3CO2)2Co·4H2O) at 270-330 °C. Co3O4 porous nanofiber monolithic catalyst demonstrated exceptional performance, exhibiting over 99% catalytic activity toward HCHO at room-temperature in indoors (10 ppm, 25 ℃) at a gas hourly space velocity of 60,000 mL·g-1h-1. This catalyst demonstrates its suitability for practical applications and its potential for energy savings. These results highlight the superiority of Co3O4 porous nanofiber monolithic catalyst over catalysts produced via the direct calcination method. The outstanding activity and stability of Co3O4 porous nanofiber monolithic catalyst make it a promising candidate for applications requiring efficient formaldehyde removal, particularly in indoors. © 2023, The Authors. All rights reserved.

关键词： Room temperature