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SSRN 2024年

作者： Lv, Siqi Ma, Xiaolong Wang, Yingrun Zheng, Yanhui Ma, Zichuan Liu, Tongxin Hebei Key Laboratory of Inorganic Nano–materials College of Chemistry and Material Science Hebei Normal University Hebei Shijiazhuang050024 China School of Environmental Science and Engineering Hebei University of Science and Technology Hebei Shijiazhuang050018 China College of Chemical Engineering Shijiazhuang University Hebei Shijiazhuang050035 China

The combustion of biogas results in the formation of glassy SiO2 deposits due to the presence of volatile methylsiloxane (VMS) impurities, necessitating their removal from the biogas. As critical components of VMS, cyclic siloxanes can undergo ring-opening polymerization. Given the minimal catalyst consumption required, concentrating cyclic siloxanes from biogas on a support surface through polymerization could be more effective than traditional adsorption methods. In this study, a silica gel-supported sulfuric acid (SSA/SG) material was developed for biogas cleanup. The silica gel's adsorption properties were utilized to capture D4 on its surface, where it underwent ring-opening polymerization catalyzed by the anchored sulfuric acid. Dynamic adsorption tests showed that SSA/SG3 had an impressive D4 adsorption capacity (Qm, th = 2459.1 mg g−1 at 20 °C), surpassing most materials used for D4 adsorption. Optimization of process conditions revealed that higher intake concentrations, moderate gas flow rates, increased adsorbent mass, and lower relative humidity significantly enhanced the D4 removal efficiency. Potential adsorption/polymerization mechanisms were also systematically explored through density functional theory calculations. These findings confirmed the formation of higher molecular weight polysiloxane structures on the sulfuric acid-supported silica gel, underscoring the cost-effectiveness and practical potential of this method for VMS removal. © 2024, The Authors. All rights reserved.

关键词： Ring opening polymerization

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Evaluating the Deformation Modulus at Representative Elementary Volume Using Electrical Resistivity Tomography

SSRN

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SSRN 2023年

作者： Akbariforouz, Mohammadreza Zhao, Qi Zheng, Chunmiao EIT Institute for Advanced Study Ningbo China Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen China

The deformation modulus of rock mass is essential for evaluating deformations and the bearing capacity of rock masses. This modulus obtained by conventional approaches, including empirical equations and in-situ tests, cannot be considered a parameter at representative elementary volume (EREV) due to limited coverage of the test area and difficulties in conducting the tests in harsh geological or topographic conditions. This study employs electrical resistivity (ER) tomography and numerical back-analysis to investigate the EREV at the Beheshtabad dam site in Iran. Geoelectrical contrasts were used to detect proper locations for installing extensometers. The deformations recorded by extensometers at excavated galleries were used to back-calculate the EREV values by numerical modeling. The deformation modulus values were evaluated by empirical equations and in-situ tests and compared to EREV values based on the developed method. A correlation was established between ER and EREV and was used to calculate EREV values at the dam axis;the results are 30 to 80% more accurate comparing the conventional approaches. Tested area, anisotropy, and plastic deformations are significant factors that can influence EREV values. Our methodology provides a systematical approach to establishing an ER-EREV relationship for evaluating rock mass deformation modulus at REV, which can be applied to rock engineering sites with harsh geology or limited access without exposing an extreme financial burden or environmental issues. © 2023, The Authors. All rights reserved.

关键词： Rocks

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Direct activation of PMS by highly dispersed amorphous CoOx clusters in anatase TiO2 nanosheets for efficient oxidation of biomass-derived alcohols

arXiv

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arXiv 2024年

作者： Jiang, Zhiwei Zhao, Zhiyue Li, Xin Li, Huaiguang Garces, Hector F. Amer, Mahmoud Yan, Kai Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology School of Environmental Science and Engineering Sun Yat-Sen University Guangzhou510275 China School of Science and Engineering The Chinese University of Hong Kong Shenzhen Guangdong Shenzhen518172 China School of Engineering Brown University 182 Hope Street Providence United States Mechanical Engineering Department Faculty of Engineering Alexandria University Alexandria21544 Egypt

Developing a green and cost-effective catalytic system for the selective oxidation of biomass-derived alcohols is vital for the sustainable synthesis of fine chemicals. Herein, highly dispersed subnanometric amorphous CoOx clusters in anatase TiO2 nanosheets (Co-TiO2) fabricated by green solvent CO2-assisted approach could directly activate peroxymonosulfate (PMS) for the highly selective oxidation of various biomass-derived alcohols. Advanced characterizations (e.g., EXAFS, EPR, AC HAADF-STEM) reveal that a strong interaction of CoOx clusters and the anatase TiO2 support exist in Co-TiO2 and Co atom in Co-TiO2 is mainly consisted of Co2+ and Co3+. The Co-TiO2 catalyst offers superior catalytic performance in the conversion of six types of alcohols (e.g., benzyl alcohol (BAL), 5-hydroxymethylfurfural (HMF)) with high selectivity to produce corresponding aldehydes. Highly dispersed CoOx clusters and the interaction between CoOx clusters and TiO2 support contribute to the superior performance. Mechanism studies show that SO4•− radicals play the dominant role in the selective oxidation of model reactant BAL and 1O2 participates in the non-radical pathway. DFT calculations are well matched with experiment and decipher that the strong interaction between CoOx clusters and TiO2 support promotes the formation of SO4•– and SO5•– Copyright © 2024, The Authors. All rights reserved.

关键词： Carbon dioxide

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Synthesis of mesoporous high‐silica zeolite Y and their catalytic cracking performance

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Chinese Journal of Catalysis 2022年第7期43卷 1945-1954页

作者： Wenhao Cui Dali Zhu Juan Tan Nan Chen Dong Fan Juan Wang Jingfeng Han Linying Wang Peng Tian Zhongmin Liu National Engineering Laboratory for Methanol to Olefins Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China Department of Catalysis Chemistry and Engineering School of Chemical EngineeringFaculty of ChemicalEnvironmental and Biological Science and TechnologyDalian University of TechnologyDalian 116024LiaoningChina

Mesoporous high‐silica zeolite Y with advantages of improved accessibility of acid sites and mass transport properties is highly desired catalytic materials for oil refinery,fine chemistry and emerg‐ing ***,we report the direct synthesis of mesoporous high‐silica zeolite Y(named MSY,SiO_(2)/Al2O_(3)≥9.8)and their excellent catalytic cracking *** obtained MSY mate‐rials are mesoporous single crystals with octahedral morphology,abundant mesoporosity and ex‐cellent(hydro)thermal *** the acid concentration and acid strength of H‐form MSY are obviously higher than those of commercial ultra‐stable Y(USY),which should be attributed to the uniform Al distribution of MSY *** H‐MSY displays an obviously reduced deactivation rate and improved catalytic activity in the cracking reaction of bulky 1,3,5‐triisopropylbenzene(TIPB),as compared with its mesoporogen‐free counterpart and *** addition,H‐MSY was investigated as catalyst for the cracking of industrial heavy *** MSY‐based catalyst(after aging at 800 oC in 100%steam for 17 h)exhibits superior conversion(7.64%increase)and gasoline yield(16.37%increase)than industrial fluid catalytic cracking(FCC)catalyst under the investigated conditions.

关键词： Mesoporous zeolite FAU Synthesis High‐silica zeolite Y Fluid catalytic cracking

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An interfacial degradation mechanism in inverted perovskite solar cells with a sol–gel derived NiOx hole transport layer

EES Solar

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EES Solar 2025年第3期1卷 331-344页

作者： Abraha Tadese Gidey Elias Assayehegn Esayas Alemayehu Alexander R. Uhl Jung Yong Kim Faculty of Materials Science and Engineering Jimma Institute of Technology Jimma University P.O. Box 378 Jimma Ethiopia Laboratory for Solar Energy and Fuels (LSEF) School of Engineering The University of British Columbia Kelowna V1V1V7 Canada Department of Chemistry College of Natural and Computational Sciences Mekelle University P.O. Box 231 Mekelle Ethiopia Faculty of Civil and Environmental Engineering Jimma Institute of Technology Jimma University P.O. Box 378 Jimma Ethiopia Department of Materials Science and Engineering Adama Science and Technology University P.O. Box 1888 Adama Ethiopia Center of Advanced Materials Science and Engineering Adama Science and Technology University P.O. Box 1888 Adama Ethiopia

NiOx-based inverted perovskite solar cells (PSCs) exhibit desirable stability and efficiency potential. However, their long-term stability remains a significant concern necessitating the investigation of interfacial s...

NiO_x-based inverted perovskite solar cells (PSCs) exhibit desirable stability and efficiency potential. However, their long-term stability remains a significant concern necessitating the investigation of interfacial stability and degradation mechanisms. Hence, the present study offers a pragmatic comprehension of the degradation pathways of the perovskite (CH₃NH₃PbI₃) layer under environmental stressors. For this purpose, the sol–gel-derived NiO_x-based inverted PSCs were exposed to moisture, oxygen, and heat energy at four different stages of device fabrication. Then, the macroscopic visual image, optical absorption, X-ray diffractograms, and device performance decays were analyzed for these layer-by-layer (LBL) structural samples. Consequently, it was found that the rapid degradation of the inverted PSCs with a NiO_x hole transport layer under humidity, air, and thermal stresses was primarily related to silver diffusion into the perovskite layer and the irreversible breakdown of perovskite into its precursors. Furthermore, the performance of the NiO_x layer for versatile perovskite materials was studied via composition engineering (i.e., mixed cation and anion systems). This work may provide practical insight for improving our understanding of device stability, paving the way for commercialization.

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Single cobalt atoms with unconventional dynamic coordination mechanism for selective ammonia sensor

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National science Review 2025年第3期12卷 284-291页

作者： Yuejiao Li Yaguang Li Yushu Shi Jianmei Gao Jianmin Lu Chao Wang Junyu Chang Zhenming Wang Yangyue Yang Bing Yang Liang Feng Qiang Fu Xinhe Bao Zhong-Shuai Wu State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Research Center for Solar Driven Carbon Neutrality Engineering Research Center of Zero-Carbon Energy Buildings and Measurement Techniques Ministry of Education The College of Physics Science and Technology Institute of Life Science and Green Development Hebei University Department of Instrumentation and Analytical Chemistry CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Environmental Research Institute Shandong University Dalian National Laboratory for Clean Energy Chinese Academy of Sciences

Developing gas sensors that can simultaneously achieve high sensitivity and selectivity for the detection of a single-type gas remains a significant challenge. Herein we demonstrate cobalt（Co） single atoms with an unconventional dynamically changing coordination structure that could be used as NH3-sensing material with superior sensitivity and selectivity. According to the steric effect of 2-methylimidazole（2MI）molecules and carbonyl groups on graphene, the Co single atom is evolved into a bidentate coordinated structure（Co-2MI-G）. In-situ characterization and theoretical simulation reveal that the sensing mechanism of Co-2MI-G is the specific chemical adsorption between unsaturated coordinated Co single atoms and NH3 molecules, causing a reversible switching of coordination number from 2 to 4, a valence state transfer from Co2+to Co3+of Co single atoms, and a band-gap width from 0.14 e V to 0.50 e V. Consequently, the Co-2MI-G-based gas sensor presents a sensing response of 67.598% for 1 ppm NH3and a limit of detection of 2.67 ppb, at least 1.8 times higher than that of state-of-the-art NH3sensors, together with robust stability and reproducibility. This work provides an innovative perspective on utilizing single atoms for ultra-selective gas sensing by coordination regulation.

关键词： single atom graphene gas sensor ultra-selective coordination chemistry

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Deep learning-based simultaneous bioavailability assessment and speciation analysis of dissolved organic copper

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Chinese Chemical Letters 2025年第05期 679-684页

作者： Zhaojing Huang Hao Li Jiayi Luo Shunxing Li Ming Zhao Fengjiao Liu Haijiao Xie College of Chemistry and Chemical Engineering Xiamen University College of Chemistry Chemical Engineering & Environmental ScienceMinnan Normal University College of Computer and Data Science/College of Software Fuzhou University School of Energy and Environmental Engineering University of Science and Technology Beijing Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology Fujian Province University Key Laboratory of Pollution Monitoring and ControlMinnan Normal University Hangzhou Yanqu Information Technology Company of Limited Liability

Algal copper uptake(i.e., Cu bioavailability) in the euphotic zone plays a vital role in algal photosynthesis and respiration, affecting the primary productivity and the source and sink of atmospheric *** Cu uptake is controlled by natural dissolved organic Cu(DOCu) speciation(i.e., complexed with the dissolved organic matter) that conventionally could be tested by model prediction or molecular-level characterizations in the lab, while DOCu uptake are hardly directly assessed. Thus, the new chemistrybiology insight into the mechanisms of the Cu uptake process in algae is urgent. The DOCu speciation transformation(organic DOCu to free Cu(II) ions), enzymatic reduction-induced valence change(reduction of free Cu(II) to Cu(I) ions), and algal Cu uptake at the algae-water interface are imitated. Herein,an intelligent system with DOCu colorimetric sensor is developed for real-time monitoring of newly generated Cu(I) ions. Deep learning with whole sample image-based characterization and powerful feature extraction capabilities facilitates colorimetric measurement. In this context, the Cu bioavailability with 7kinds of organic ligands(e.g., amino acids, organic acids, carbohydrates) can be predicted by the mimetic intelligent biosensor within 15.0 min, i.e., the DOCu uptake and speciation is successfully predicted and streamlined by the biomimetic approach.

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Organic solvents induced enhancement of phase-splitting behaviors and CO2 absorption performance in biphasic absorbent

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Separation and Purification technology 2025年 362卷

作者： Yang, Yang Wang, Shaona Yang, Kanghuai Xu, Wenqing Wang, Xueqian Geng, Zanbu Liao, Guoping Ning, Ping Zhu, Tingyu CAS Key Laboratory of Green Process and Engineering Institute of Process Engineering Innovation Academy for Green Manufacture Chinese Academy of Sciences Beijing100190 China Faculty of Environmental Science and Engineering Kunming University of Science and Technology Kunming650500 China University of Chinese Academy of Sciences Beijing100049 China Shenyang University of Chemical Technology Shenyang China Wu-Kun Iron & Steel Co. Ltd. Kunming650302 China

Reducing the rich phase ratio is a key issue for developing the biphasic absorbents. In this study, it is found that the hydrophobic solvents (sulfolane and N, N-dimethylformamide) are beneficial for reducing rich phase volume, while hydrophilic solvents (n-propanol, Polyethylene glycol) inhibit the phase splitting. Sulfolane is the optimal solvent, wherein, the rich phase ratio is greatly reduced from 79 % to 37 %. The CO2 absorption capacity in the rich phase increases from 2.50 M to 4.25 M. The kinetic studies show that the total mass transfer coefficient is increased by 1.96 times with sulfolane addition. The regeneration energy consumption of the developed absorbent is only 1.85 GJ/t-CO2, which is 53.6 % less than MEA. The results can provide a theoretical reference for developing high-performing biphasic absorbents. © 2025 Elsevier B.V.

关键词： Direct air capture

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The State-of-the-Art Review on Applications of Intrusive Sensing,Image Processing Techniques,and Machine Learning Methods in Pavement Monitoring and Analysis

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engineering 2021年第6期7卷 845-856页

作者： Yue Hou Qiuhan Li Chen Zhang Guoyang Lu Zhoujing Ye Yihan Chen Linbing Wang Dandan Cao Beijing Key Laboratory of Traffic Engineering Beijing University of TechnologyBeijing 100124China Key Laboratory of Transport Industry of Big Data Application Technologies for Comprehensive Transport Beijing Jiaotong UniversityBeijing 100044China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China National Center for Materials Service Safety University of Science and Technology BeijingBeijing 100083China School of Transportation Southeast UniversityNanjing 211189China Department of Civil and Environmental Engineering Virginia TechBlacksburgVA 24061USA

In modern transportation,pavement is one of the most important civil infrastructures for the movement of vehicles and *** service quality and service life are of great importance for civil engineers as they directly affect the regular service for the ***,monitoring the health status of pavement before irreversible damage occurs is essential for timely maintenance,which in turn ensures public transportation *** pavement damages can be detected and analyzed by monitoring the structure dynamic responses and evaluating road surface *** technologies can be employed for the collection and analysis of such data,including various intrusive sensing techniques,image processing techniques,and machine learning *** review summarizes the state-ofthe-art of these three technologies in pavement engineering in recent years and suggests possible developments for future pavement monitoring and analysis based on these approaches.

关键词： Pavement monitoring and analysis The state-of-the-art review Intrusive sensing Image processing techniques Machine learning methods

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Toluene Decomposition by Non-Thermal Plasma Assisted 2d Coox/Al2o3: The Relative Contributions of Specific Energy Density of Plasma, Co 3+ and Oxygen Vacancy

SSRN

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SSRN 2023年

作者： Lei, Xinshui Wang, Jiangen Wang, Teng Wang, Xinjie Xie, Xiaowen Huang, Haibao Li, Didi Ao, Zhimin Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health Guangzhou Key Laboratory Environmental Catalysis and Pollution Control Institute of Environmental Health and Pollution Control Guangdong University of Technology Guangzhou510006 China Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education School of Environmental Science and Engineering Guangdong University of Technology Guangzhou510006 China School of Environmental Science and Engineering Sun Yat-sen University Guangzhou510006 China Advanced lnterdisciplinary Institute of Environment and Ecology Beijing Normal University Zhuhai519087 China

Cobalt oxide (CoOx) is a common catalyst for plasma catalytic elimination of volatile organic compounds (VOCs). However, the catalytic mechanism of CoOx under radiation of plasma is still unclear, such as how the relative importance of the intrinsic structure of the catalyst (e.g., oxygen vacancy and Co3+) and the specific energy density (SED) of the plasma for toluene catalytic performance. 2D CoOx/γ-Al2O3 catalysts were prepared and evaluated by toluene catalytic performance. Based on both characterizations and in-situ diffuse reflectance infrared Fourier transform spectroscopy (in-situ DRIFTS) results, the oxygen vacancies were discovered to be the active sites for O3 decomposition, and the Co3+ cations could reduce the formation energy of oxygen vacancies. The fitting results of artificial neural network (ANN) presented that the relative importance of SED and oxygen vacancy for mineralization rate were 59% and 23%, respectively, followed by the Co3+ cations (18%). The relative importance of SED and Co3+ cations for CO2 selectivity were 73% and 20%, respectively, followed by the oxygen vacancy (7%). Furthermore, a possible reaction pathway of toluene decomposition was proposed based on time-of-flight mass spectroscopy (PTR-TOF-MS) and in-situ DRIFTs analysis results. This work could help with the rational design of catalysts for plasma catalytic systems. © 2023, The Authors. All rights reserved.

关键词： Cobalt compounds

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