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SSRN 2024年

作者： Wang, Jing Chen, Junpeng Li, Shuang Zhao, Yuan Zhao, Jiachao Liang, Xinyu Xia, Meirong Yang, Jun Yong, Xue Tse, John S. Key Laboratory of Applied Chemistry China Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse School of Environmental and Chemistry Engineering State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao066004 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China Department of Electrical Engineering and Electronics University of Liverpool United Kingdom Department of Physics University of Saskatchewan SaskatoonSKS7N 5B2 Canada

The cobalt, earth abundant transition metal, embedded in nitrogen doped carbon material as single atom site (Co-N-C) has been manifested as promising electrochemical oxygen reduction reaction (ORR) catalyst, however the unsatisfying production selectivity has hampered its widespread applications. Herein, the H2O2 selectivity of Co-N-C catalyst has been tailored with Co axial functional groups.. Thermodynamically, the selectivity is regulated due to the fine-tunning of the adsorption of the key reaction intermediates (ΔG*OOH), and five functional groups, including -O, -OH, -CN, CH3 and -SO3, endow the Co-N-C catalyst with superior H2O2 selectivity. Importantly, we unravel a new water medicated recombination of solute OH• reaction pathway for H2O2 production, which was the result of dissociation of *HOOH in explicit water environment That is two ·OH species reaction in the liquid environment which originated from the creaking of *OOH intermediates due to the weakened O-O bond by the interaction with surrounding water. This study provides foundational understanding for the ORR catalytic mechanism at the electrochemical interface and open up new avenues for rational design of targeted high efficiency electrocatalysts. © 2024, The Authors. All rights reserved.

关键词： Electrolytic reduction

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Cu/Cu_(2)O nanoparticles co-regulated carbon catalyst for alkaline Al-air batteries

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Chinese Chemical Letters 2021年第8期32卷 2427-2432页

作者： Jing Tian Depei Liu Jingsha Li Dan Sun Hongtao Liu Haiyan Wang Yougen Tang Hunan Provincial Key Laboratory of Chemical Power Sources College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China Eco-materials and Renewable Energy Research Center(ERERC) National Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresSchool of PhysicsNanjing UniversityNanjing 210093China Institute of Materials Science and Devices Suzhou University of Science and TechnologySuzhou 215011China Key Laboratory of Preparation and Application of Environmental Friendly Materials of Ministry of Education Jilin Normal UniversityChangchun 130103

Developing high-efficiency,inexpensive,and steady non-precious metal oxygen reduction reaction(ORR) catalysts to displace Pt-based catalysts is significant for commercial applications of Al-air ***,we have prepared the Cu/Cu_(2)O-NC catalyst with excellent ORR performance and high stability,due to the synergistic effect of Cu and Cu_(2)O *** half-wave potential(0.8 V) and the limiting-current density(5.20 mA/cm^(2)) of the Cu/Cu_(2)O-NC are very close to those of the 20% Pt/C catalyst(0.82 V,5.10 mA/cm^(2)).Besides,it exhibits excellent performance with a maximal power density of 250 mW/cm^(2) and a stable continuous discharge for more than 90 h in the Al-air battery test The promoting effects of Cu_(2)O towards Cu-based ORR catalysts are illustrated as follows:(ⅰ) Cu_(2)O is the major ORR active site by the redox of Cu(Ⅱ)/Cu(Ⅰ),which provides excellent ORR activities;(ⅱ) Cu can stabilize the location of Cu_(2)O by assisting the electron transfer to Cu(Ⅱ)/Cu(Ⅰ) redox,which is conducive to the high stability of the *** work provides a useful strategy for enhancing the ORR performance of Cu-based catalysts.

关键词： Cu/Cu_(2)O Oxygen reduction reaction Al-air battery Stability Synergistic effect

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Effects of cerium precursors on surface properties of mesoporous CeMnO_x catalysts for toluene combustion

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Journal of Rare Earths 2020年第1期38卷 70-75页

作者： Changyu Zhang Wei Chu Feng Chen Lei Li Ruiyu Jiang Jinlong Yan School of Environment and Safety Engineering Changzhou UniversityChangzhou 213164China School of Environmental Science and Engineering Yancheng Institute of TechnologyYancheng 224051China Department of Chemical Engineering Sichuan UniversityChengdu 610065China Jiangsu Key Laboratory for Environment Functional Materials Suzhou University of Science and TechnologySuzhou 215009China

Mesoporous CeMnOx composite oxides catalysts were prepared by surfactant-assisted co-precipitation method and used for the catalytic oxidation of *** effect of different cerium precursors[Ce(NO3)3 and(NH4)2 Ce(NO3)6] on catalyst structure,surface properties and toluene combustion activities of mesoporous CeMnOx catalysts were *** Ce(Ⅲ)MnOx catalyst prepared from Ce(NO3)3 precursor shows higher catalytic activity,with a 90% conversion temperature of 240℃,which is better than the Ce(Ⅳ)MnOx catalyst derived from[(NH4)2 Ce(NO3)6] *** the basis of characterizations,it reveals that abundant surface content of Mn4+,better redox behavior and larger concentration of surface active oxygen species are responsible for the excellent catalytic performance.

关键词： Cerium precursor CeMnOx composite catalyst Synergistic effect Catalytic combustion Toluene Rare earths

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Small Ponds as Hotspots of Carbon Burial in Agricultural Landscape

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SSRN 2024年

作者： Ji, Yulai Huang, Jiacong Zhu, Qing Zhang, Shuai Lei, Shaohua Xiao, Qitao Shi, Wenqing Gao, Junfeng Key Laboratory of Watershed Geographic Sciences Nanjing Institute of Geography and Limnology Chinese Academy of Sciences 73 East Beijing Road Nanjing210008 China University of Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Hydrology-Water Resources & Hydraulic Engineering Nanjing Hydraulic Research Institute Nanjing210098 China School of Environmental Science & Engineering Nanjing University of Information Science & Technology Nanjing210044 China

Carbon (C) cycling in small ponds within agricultural landscapes is of increasing concern due to its critical role in terrestrial carbon transport. However, quantifying this process has been challenging due to its complex mechanisms and the strong influence of intensive human activities. To bridge this gap, a daily process-based model named Pond-C was specifically developed to describe C dynamics and quantify C sources, sinks, and cycling within agricultural ponds. To evaluate the model performance, a five-year (2018-2022) biweekly sampling program was conducted at a typical agricultural pond in the lowland area of Lake Taihu Basin, eastern China. The model demonstrated adequate performance, achieving a model performance index (NS) higher than 0.3. The modeling practices revealed that the agricultural pond served as a significant hotspot for C burial, with a rate of 1273.6 g C·m-2·yr-1, primarily through C settling. Phytoplankton played a critical role in accelerating C cycling within the pond, with key processes including phytoplankton growth, death and settling. Interestingly, the agricultural pond was identified as a source of C, releasing 184.38 g C·m-2·yr-1. Compared with previous studies in C-flux estimation, the newly-developed model (Pond-C) provided an avenue for drawing a comprehensive picture of C flux for each process, and thus enhanced our understanding of C cycling within the pond ecosystems. © 2024, The Authors. All rights reserved.

关键词： Lakes

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An Ecologically-extended Input-output Model for Evaluating VirtualWater Flows in Kazakhstan 3

An Ecologically-extended Input-output Model for Evaluating V...

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2021 3rd International Conference on E-Business and E-Commerce engineering, EBEE 2021

作者： Ma, Zhenhao Liu, Jing Li, Yongping School of Environmental Science and Engineering Xiamen University of Technology Xiamen361024 China State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing100875 China

ISBN: (纸本)9781450387392

In the face of the increasing water shortages in the process of rapid urbanization, the evaluation of virtual water is helpful to achieve source reduction in water shortage area. In this study, an ecologically-extended input-output model (EIOM) was developed by combining input-output analysis (IOA) and the ecological network analysis (ENA) to examine virtual water between different sectors and apply it to Kazakhstan. The main results show that: (i) the total water use coefficient of AGR (agriculture) is much higher than that of other sectors and is dominated by direct water use;(ii) AGR (agriculture) is the largest virtual water export sector, with a total output of 7.1 × 109 m3 virtual water in the region;(iii) exploitation is dominant in the virtual water network. More attention should be paid to agriculture when formulating water policy. © 2021 ACM.

关键词： Agriculture

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Research on silicoaluminate-based low-carbon cementitious material—A state-of-the-art review

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Fundamental Research 2024年

作者： Jiang, Jinyang Sui, Shiyu Liu, Zhiyong Wang, Fengjuan Geng, Guoqing Jiangsu Key Laboratory of Construction Materials School of Materials Science and Engineering Southeast University Nanjing 211189 China School of Civil Engineering Qingdao University of Technology Qingdao 266520 China Department of Civil and Environmental Engineering National University of Singapore 117576 Singapore

The green and low-carbon production of cement is the essential pathway for infrastructure sustainability and the implementation of a dual-carbon strategy. To mitigate the increasingly criticized environmental impact of cement production, silicoaluminate-based cementitious materials utilizing pozzolanic waste and low-grade materials have received considerable attention in recent years. They not only reduce CO₂ emissions but also decrease the reliance on nonrenewable resources, thus promoting the sustainable development of building materials. This paper provides a comprehensive review of the latest research progress on low-carbon cementitious materials based on silicoaluminate and limestone. First, an introduction to the current low-carbon cementitious materials is provided that helps address the necessity of exploring silicoaluminate-based low-carbon cementitious materials. Then, the hydration and microstructure evolution, mechanical properties, and durability characteristics of these new cementitious materials are analyzed. Furthermore, the net benefits of this low-carbon material sustainability are summarized from a life-cycle perspective. Finally, the paper suggests some directions for future research in this field. © 2024

关键词： Durability Hydration Low-carbon cement Microstructure Silicoaluminate

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Increase of P and Cd bioavailability in the rhizosphere by endophytes promoted phytoremediation efficiency of Phytolacca acinosa

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Journal of Hazardous Materials 2022年 431卷 128546页

作者： Liu, Chenjing Lin, Hai Dong, Yingbo Li, Bing School of Energy and Environmental Engineering University of Science and Technology Beijing Beijing100083 China Beijing Key Laboratory on Resource-Oriented Treatment of Industrial Pollutants Beijing100083 China

The information about the spatial distribution of bioavailable phosphorus (P) and heavy metal (HM) in the rhizosphere could aid in the precise phytoremediation regulation. In this study, a rhizobox system was adapted to study soil-root interactions and used to access the endophyte inoculation variation on bioavailable P and cadmium (Cd) spatial distribution during phytoremediation of Cd contaminated soils. Results showed that endophyte PE31 Bacillus cereus inoculation enhanced Cd uptake of P. acinosa by 52.70% and 46.73% in low and high Cd contaminated soils, increasing the phytoremediation hotspot area from 45.78% and 15.29% to 60.97% and 21.80%, respectively. Available P and Cd significantly diminished because root activities depleted large amounts of bioavailable P and Cd concentrations. However, PE31 increased bioavailable P and Cd concentration in the rhizosphere soil. The bioavailable P enhancement in the rhizosphere was positively correlated to plant growth and Cd accumulation. Overall, endophyte inoculation compensated the diminution of bioavailable P and Cd in the rhizosphere to improve plant biomass and HM absorption, and thus promote phytoremediation efficiency. This study helped to better understand bioavailable P and Cd spatial distribution under endophyte inoculation, which could provide effective management strategies for the precise regulation of phytoremediation. © 2022 Elsevier B.V.

关键词： Spatial distribution

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Nitrogen-Doped Bi2o2co3 Nanosheets Embedded with Surface Oxygen Vacancies for Augmented Photocatalytic Degradation of Levofloxacin

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SSRN 2023年

作者： Yuan, Zhenxi Zhang, Ling Tan, Lu Chen, Weirui Liao, Gaozu Li, Laisheng Wang, Jing School of Environment South China Normal University Guangzhou510006 China School of Environmental Science and Engineering Guangdong University of Technology Guangzhou510006 China Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment South China Normal University Guangzhou510006 China Guangdong Provincial Key Lab of Functional Materials for Environmental Protection Guangzhou510006 China

Herein, a series of two-dimensional nitrogen-doped Bi2O2CO3 nanosheets embedded with surface oxygen vacancies (OVs) are synthesized via a bottom-up self-assembly from one-step hydrolysis. They can serve as efficient photocatalysts that allow a degradation ratio of levofloxacin (LEV) up to 94.4% within 50 min under simulated sunlight, which is 2.5 times over undoped Bi2O2CO3. Incorporation of N atoms into the Bi2O2CO3 lattice not only extends the light absorption range for more effective utilization of solar light, but also narrows the band gap and increases the OVs concentration as well, which dramatically promotes the separation of photo-induced charge-carriers, ultimately accelerating the production of active species identified to be mainly holes (h+) and superoxide anion radicals (•O2-). © 2023, The Authors. All rights reserved.

关键词： Bismuth compounds

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Boosted Energy Storage Densities in Lead-Free Na0.5bi0.5tio3-Based Thick Film Ceramics Via the Compositional and Microstructural Tailoring

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SSRN 2024年

作者： Niu, Xiang Jiang, Yuleng Liang, Wei Liu, Huanwei Jian, Xiaodong Chen, Xianyi Zeng, Wenhan Xu, Mingtao Qie, Dan Zhu, Zichun Liu, Yufeng Tang, Yi Gong, Weiping Zhao, Xiaobo Yao, Yingbang Liang, Bo Tao, Tao Lu, Sheng-Guo Guangdong Provincial Research Center on Smart Materials and Energy Conversion Devices Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter School of Materials and Energy Guangdong University of Technology Guangzhou510006 China School of integrated Circuits Guangdong University of Technology Guangzhou510006 China Science and Technology on Reliability Physics and Application of Electronic Component Laboratory The 5th Electronics Research Institute The Ministry of Industry and Information Technology Guangzhou510610 China School of Physics and Optoelectronic Engineering Guangdong University of Technology Guangzhou510006 China Department of Materials Science and Engineering National University of Singapore 9 Engineering Drive 1 Singapore117575 Singapore Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices Huizhou University Guangdong Huizhou516001 China

Developing ecologically benign lead-free dielectrics with overall outstanding energy storage properties (ESP) is a fundamentally significant demand and challenge for the applications in pulse power systems. Herein, a new type of lead-free (0.74-x)Bi0.5Na0.5TiO3-0.06BaTiO3-0.2SrTiO3-xBi(Mg0.5Zr0.5)O3 (NBT-xBMZ) relaxor ferroelectric thick film ceramics were designed and prepared via compositional and microstructural optimization. Doping Bi(Mg0.5Zr0.5)O3 (BMZ) effectively widened the bandgap, introduced polar nanoregions, enhanced the relaxor ferroelectric characteristics, improved the impedances, and ultimately improved the dielectric breakdown strength (DBS) as well as the ESP. As confirmed by both the selected area electron diffraction patterns and the Rietveld refinement of X-ray diffraction patterns, multiphase coexistence structure was successfully constructed, resulting in merged polarization and delayed polarization saturation. Multiphase coexistence structure, pinched polarization-electric field hysteresis loops and ultrahigh DBS collectively boost the ESP. Remarkably, a recoverable energy storage density of 15.79 J/cm3 and an energy storage efficiency of 92.86% were achieved in NBT-0.22BMZ thick film. Benefiting from the microstructural optimization, excellent thermal stability (20–160 °C), frequency stability (1–200 Hz), and fatigue endurance (> 104 cycles) were realized for the same composition. Additionally, the NBT-0.22BMZ thick film also exhibited a large power density of 582.47 MW/cm3 and an ultrafast discharge speed of ~44.0 ns. This work provides a novel strategy to develop next-generation dielectric capacitors with superior energy storage properties for applications in advanced pulse power systems. © 2024, The Authors. All rights reserved.

关键词： Polarization

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Egg shell waste as an activation agent for the manufacture of porous carbon

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Chinese Journal of Chemical engineering 2020年第3期28卷 896-900页

作者： Yawei Shi Guozhu Liu Mingde Li Liang Wang State Key Laboratory of Separation Membranes and Membrane Processes School of Environmental Science and EngineeringTianjin Polytechnic UniversityTianjin 300387China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Hangzhou Environmental Protection Research Institute of China Coal Technology&Engineering Group Hangzhou 311201China

Egg shell waste was used as an activation agent directly for the manufacture of a biomass-derived porous carbon,which possessed a surface area of 626 m2·g-1 and was rich in nitrogen,sulfur and oxygen *** activation mechanism was proposed,and the carbon showed its potential to act as an adsorbent for the adsorptive removal of various contaminants from both aqueous and non-aqueous solutions,possessing maximum adsorption capacities of 195.9,185.1,125.5 and 44.6 mg·g-1 for sulfamethoxazole,methyl orange,diclofenac sodium and dibenzothiophene,*** the utilization of egg shell waste as a sustainable activation agent,this work may help to make the widely applied biomass-derived porous carbons more economical and ecological.

关键词： Carbon materials Porous materials Egg shell Activation agent Biomass

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