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Boosting the catalytic performance of Cu-SAPO-34in NO_(x) removal via hydrothermal treatment

Journal of environmental sciences 2024年第1期135卷 640-655页

作者： Xiaoyan Tian Huimin Wang Siyuan Xu Lianyun Gao Jinyan Cao Jianjun Chen Qiulin Zhang Ping Ning Jiming Hao Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries Kunming University of Science and TechnologyKunming 650500China School of Environment State Key Joint Laboratory of Environment Simulation and Pollution ControlTsinghua UniversityBeijing 100084China

Phosphate ions promoted Cu-SAPO-34(P-Cu-SAPO-34)were prepared using bulk CuO particles as Cu^(2+)precursor by a solid-state ion exchange technique for the selective catalytic reduction of NO_(x) with NH_3(NH_3-SCR).The effects of high temperature(H-T)hydrothermal aging on the NO_(x) removal(de-NO_(x))performance of Cu-SAPO-34 with and without phosphate ions were systematically investigated at atomic *** results displayed that both Cu-SAPO-34 and P-Cu-SAPO-34 presented relatively poor NO_(x) removal activity with a low conversion(<30%)at 250-500℃.However,after H-T hydrothermal treatment(800℃ for 10 hr at 10%H_2O),these two samples showed significantly satisfied NO_(x) elimination performance with a quite high conversion(70%-90%)at 250-500℃.Additionally,phosphate ions decoration can further enhance the catalytic performance of Cu-SAPO-34 after hydrothermal treatment(Cu-SAPO-34H).The textural properties,morphologies,structural feature,acidity,redox characteristic,and surface-active species of the fresh and hydrothermally aged samples were analyzed using various characterization *** systematical characterization results revealed that increases of 28%of the isolated Cu^(2+)active species(Cu^(2+)-2Z,Cu(OH)^(+)-Z)mainly from bulk CuO and 50%of the Bronsted acid sites,the high dispersion of isolated Cu^(2+)active component as well as the Bronsted acid sites were mainly responsible for the accepted catalytic activity of these two hydrothermally aged samples,especially for P-Cu-SAPO-34H.

关键词： NH_(3)-SCR Cu-SAPO-34 Hydrothermal induced Phosphate ions

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Fault Diagnosis of Unmanned Aerial Vehicle Based on the Slime Mold Algorithm under Imbalanced Data Conditions 14

Fault Diagnosis of Unmanned Aerial Vehicle Based on the Slim...

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14th International Conference on reliability, Maintainability and Safety, ICRMS 2023

作者： Wu, Xinman Zhang, Wenjin Li, Yu Suo, Mingliang Institute of Reliability Engineering National Key Laboratory of Science and Technology on Reliability and Environmental Engineering School of Reliability and Systems Engineering Beihang University Beijing China

ISBN: (纸本)9798350329988

With the rapid progress of technology, the application of unmanned aerial vehicles (UAVs) has become widespread in various civilian and military activities. The research on fault diagnosis during a flight is a critical step towards enhancing the safety of UAV systems. Swarm-inspired heuristic algorithms have attracted significant attention owing to their fast iteration speed and strong optimization capabilities. This paper proposes a UAV fault diagnosis method based on the slime mold algorithm (SMA) under the condition of imbalanced data, thus addressing the issue of low diagnostic accuracy caused by a significantly longer normal flight time compared to the fault flight time in UAV operations. Using a real-world dataset of UAV flight faults with multiple fault patterns, the proposed approach optimizes the parameters of the support vector machine through SMA, thereby improving the fault diagnosis performance during actual UAV flights. © 2023 IEEE.

关键词： Micro air vehicle (MAV)

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Recycling of stainless steel pickling wastewater and polyethylene terephthalate plastic: A total-waste synthesis of metal-organic framework

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Progress in Natural science:Materials International 2023年第4期33卷 478-485页

作者： Xudong Zhao Linshuai Zhang Baosheng Liu Chengwei Zhang Huifang Zhao Chong-Chen Wang Dahuan Liu College of Chemical Engineering and Technology Taiyuan University of Science and Technology College of Materials Science and Engineering Engineering Research Center for Magnesium Alloy of Shanxi Province Taiyuan University of Science and Technology State Key Laboratory of Organic-Inorganic Composites College of Chemical Engineering Beijing University of Chemical Technology Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation Beijing University of Civil Engineering and Architecture

Metal-organic frameworks（MOFs） attract considerable interests in various fields while relatively high cost limits their industrial-level use. Herein, we proposed a total-waste preparation route for Fe/Cr-MIL-88B（MIL, Mat erial Institut Lavoisier）, in which stainless steel pickling wastewater（PW） and waste polyethylene terephthalate（PET）act the total raw materials. Interestingly, PET is easily decomposed to terephthalic acid（H2BDC） under the strong acid environment of PW. Benefited from that, the formation of MOFs from PET and PW can be achieved via one-pot hydrothermal reaction, superior to the traditional two-step method. The obtained MIL-88B exhibits long-term acid/base stability and high removal efficiency for zirconium（Ⅳ） ion. Besides, the structure and adsorption performance of the products are not controlled by the discharge batch of the pickling wastewater, indicating the feasibility for continuous production in industry. Thus, our work provides a feasible route for preparing low-cost MOFs and recycling industrial wastes.

关键词： Metal-organic framework Industrial waste Resource recycle Adsorption

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Use of forestry waste as an alternative raw material for generating metallurgical coke

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Journal of Iron and Steel Research International 2025年第1期32卷 25-39页

作者： Lin-bo Qin Wei Qin An-yi Wang Ling Shi Jun Han College of Resources and Environment Engineering Wuhan University of Science and TechnologyWuhan430081HubeiChina Hubei Key Laboratory of Industrial Fume and Dust Pollution Control Jianghan UniversityWuhan430056HubeiChina Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources Wuhan University of Science and TechnologyWuhan430081HubeiChina

Forestry waste(FW)is a significant renewable energy source in *** substitution of coal blends(BC)with forestry waste to produce metallurgical coke was investigated aiming at expanding alternative resources and reducing CO_(2)emissions in ironmaking *** BC with different ratios of FW were carbonized in a fixed bed reactor,and the physicochemical structure of the coke derived from FW/BC co-carbonization was characterized by Fourier transform infrared spectroscopy,X-ray photoelectron spectroscopy,solid-state^(13)C nuclear magnetic resonance,optical microscopy,and scanning electron *** results reveal that the suitable incorporation of FW in BC is 10 wt.%,and the index of coke quality exhibits a good correlation with the optical anisotropy index and the aromaticity of the as-obtained *** partial substitution of BC with FW exhibits potential benefits for colloid formation,owing to the higher hydrogen in ***,as the substitution ratio of BC with FW increases,it inhibits coke agglomeration due to more tortuous stacked structures formation during volatile releasing ***,it was identified that the substitution of higher BC ratios with FW results in the partial replacement of aromatic carbons by oxygenlinked carbons and aliphatic *** substitution leads to a reduction in the aromaticity of the as-obtained coke.

关键词： Metallurgical coke Forestry waste Coal blend Co-carbonization Chemical structure

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Novel quantitative structure activity relationship models for predicting hexadecane/air partition coefficients of organic compounds

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Journal of environmental sciences 2023年第2期35卷 98-104页

作者： Ya Wang Weihao Tang Zijun Xiao Wenhao Yang Yue Peng Jingwen Chen Junhua Li State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Key Laboratory of Industrial Ecology and Environmental Engineering(MOE) School of Environmental Science and TechnologyDalian University of TechnologyLinggong Road 2Dalian 116024China

Predicting the logarithm of hexadecane/air partition coefficient(L)for organic compounds is crucial for understanding the environmental behavior and fate of organic compounds and developing prediction models with polyparameter linear free energy ***,two quantitative structure activity relationship(QSAR)models were developed with 1272 L values for the organic compounds by using multiple linear regression(MLR)and support vector machine(SVM)*** the basis of the OECD principles,the goodness of fit,robustness and predictive ability for the developed models were *** SVM model was first developed,and the predictive capability for the SVM model is slightly better than that for the MLR *** applicability domain(AD)of these two models has been extended to include more kinds of emerging pollutants,i.e.,oraganosilicon *** developed QSAR models can be used for predicting L values of various organic *** van derWaals interactions between the organic compound and the hexadecane have a significant effect on the L value of the *** in silico models developed in current study can provide an alternative to experimental method for high-throughput obtaining L values of organic compounds.

关键词： L value Quantitative structure-activity relationship Multiple linear regression Support vector machine Oraganosilicon compounds

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Pt-surface oxygen vacancies coupling accelerated photo-charge extraction and activated hydrogen evolution

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Nano Research 2023年第4期16卷 4736-4741页

作者： Fangxu Dai Mingming Zhang Mingzhong Mi Zhenjiang Li Jun Xing Lei Wang Key Laboratory of Eco-chemical Engineering Ministry of EducationCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042China College of Environment and Safety Engineering Qingdao University of Science and TechnologyShandong Engineering Research Center for Marine Environment Corrosion and Safety ProtectionQingdao 266042China

Semiconductors-based heterogeneous photocatalytic water splitting has been extensively studied,but it still remains challenging to accelerate the separation of electron-hole pairs and facilitate the reaction *** we report a general strategy to fabricate highly efficient Pt/TiO_(2)photocatalyst by coupling the Pt co-catalysts and surface oxygen vacancies(VO)of TiO_(2).TiO_(2)was pre-modified with alkali or alkaline earth metals ion solutions,which produce a large number of surface hydroxyl on TiO_(2).Subsequently,the photodeposited Pt sub-nanoparticles substitute surface hydroxyl and induce surface VO on TiO_(2).The coupling of Pt and surface VO on TiO_(2)can accelerate the extraction of photo-charges through the interaction of Pt-VO-Ti bonds and reduce the hydrogen evolution barrier,thereby promoting the photocatalytic *** synthesized Pt-VO-TiO_(2)sample exhibits a photocatalytic hydrogen evolution activity as high as 1.5 L·g^(−1)·h^(−1),which is 2.2 times that of traditional Pt/TiO_(2).Our findings indepth understand the synergistic effect of co-catalysts and defects on photocatalysis and open up new possibilities for achieving robust photocatalytic water splitting.

关键词： oxygen vacancies co-catalyst surface hydroxyl photocatalytic hydrogen evolution reaction(HER)

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Effects of high temperature and thermal cycles on fracture surface's roughness of granite:An insight on 3D morphology

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Journal of Rock Mechanics and Geotechnical engineering 2025年第2期17卷 810-826页

作者： Qixiong Gu Zhen Huang Kui Zhao Wen Zhong Li Liu Xiaozhao Li Yun Wu Ma Dan Key Laboratory of Mining Engineering of Jiangxi Province Jiangxi University of Science and TechnologyGanzhou341000China School of Resources and Environment Engineering Jiangxi University of Science and TechnologyGanzhou341000China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou221116China School of Resources and Earth Science China University of Mining and TechnologyXuzhou221116China School of Mines China University of Mining and TechnologyXuzhou221116China

The roughness of the fracture surface directly affects the strength,deformation,and permeability of the surrounding rock in deep underground *** the effect of high temperature and thermal cycle on the fracture surface roughness plays an important role in estimating the damage degree and stability of deep rock *** this paper,the variations of fracture surface roughness of granite after different heating and thermal cycles were investigated using the joint roughness coefficient method(JRC),three-dimensional(3D)roughness parameters,and fractal dimension(D),and the mechanism of damage and deterioration of granite were *** experimental results show an increase in the roughness of the granite fracture surface as temperature and cycle number were *** variations of JRC,height parameter,inclination parameter and area parameter with the temperature conformed to the Boltzmann's functional distribution,while the D decreased linearly as the temperature ***,the anisotropy index(Ip)of the granite fracture surface increased as the temperature increased,and the larger parameter values of roughness characterization at different temperatures were attained mainly in directions of 20°–40°,60°–100°and 140°–160°.The fracture aperture of granite after fracture followed the Gauss distribution and the average aperture increased with increasing temperature,which increased from 0.665 mm at 25℃to 1.058 mm at 800℃.High temperature caused an uneven thermal expansion,water evaporation,and oxidation of minerals within the granite,which promoted the growth and expansion of microfractures,and reduced interparticle bonding *** particular,the damage was exacerbated by the expansion and cracking of the quartz phase transition after T>500℃.Thermal cycles contributed to the accumulation of this damage and further weakened the interparticle bonding forces,resulting in a significant increase in the roughness,anisotropy,and aperture of the

关键词： Granite Thermal cycles High temperature Fracture surface roughness Anisotropic Thermal damage

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In Situ Coupling of Reduction and Oxidation Processes with Alternating Current-Driven Bioelectrodes for Efficient Mineralization of Refractory Pollutants

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engineering 2024年第12期43卷 125-138页

作者： Ye Yuan Junjie Zhang Wanxin Yin Lulu Zhang Lin Li Tianming Chen Cheng Ding Wenzong Liu Aijie Wang Fan Chen School of Environmental Science and Engineering Yancheng Institute of TechnologyYancheng 224051China School of Ecology and Environment Northwestern Polytechnical UniversityXi’an 710129China State Key Laboratory of Urban Water Resource and Environment School of Civil and Environmental EngineeringHarbin Institute of Technology ShenzhenShenzhen 518055China

The effective elimination of aromatic compounds from wastewater is imperative for safeguarding the ecological *** processes that combine cathodic reduction and anodic oxidation represent a promising approach for the biomineralization of aromatic ***,conventional direct current bioelectrochemical methods have intrinsic *** this study,a low-frequency and low-voltage alternating current(LFV-AC)-driven bioelectrode offering periodic in situ coupling of reduction and oxidation processes was developed for the biomineralization of aromatic compounds,as exemplified by the degradation of alizarin yellow R(AYR).LFV-AC stimulated biofilm demonstrated efficient bidirectional electron transfer and oxidation–reduction bifunctionality,considerably boosting AYR reduction(63.07%±1.91%)and subsequent mineralization of intermediate products(98.63%±0.37%).LFV-AC stimulation facilitated the assembly of a collaborative microbiome dedicated to AYR metabolism,characterized by an increased abundance of functional consortia proficient in azo dye reduction(Stenotrophomonas and Bradyrhizobium),aromatic intermediate oxidation(Sphingopyxis and Sphingomonas),and electron transfer(Geobacter and Pseudomonas).The collaborative microbiome demonstrated a notable enrichment of functional genes encoding azo-and nitro-reductases,catechol oxygenases,and redox mediator *** findings highlight the effectiveness of LFV-AC stimulation in boosting azo dye biomineralization,offering a novel and sustainable approach for the efficient removal of refractory organic pollutants from wastewater.

关键词： Alternating current Bioelectrode Redox process Bio-mineralization Electrode microbiome Refractory organic pollutants

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Spatio-temporal variations in air/ground freezing–thawing indices along the China–Nepal Highway during 1987–2017

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Journal of Mountain science 2025年第2期22卷 521-536页

作者： ZHANG Tianqi LUO Tao ZHANG Chonglei YU Wenbing PEI Wansheng Shaanxi Key Laboratory of Safety and Durability of Concrete Structures Xijing UniversityXi’an 710123China State Key Laboratory of Mountain Hazards and Engineering Resilience Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China Institute of Future Civil Engineering Science and Technology Chongqing Jiaotong UniversityChongqing 400074China Key Laboratory of Cryospheric Science and Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China

Freezing–thawing indices serve as a comprehensive indicator of both the duration of the freezing/thawing periods and the degree of cold and heat in a given ***-depth analysis of the freezing-thawing indices not only enables the prediction of permafrost distribution and its dynamic changes,but also facilitates the assessment of damage risk to infrastructure under freeze-thaw *** this paper,the air/ground freezing–thawing indices from 1987 to 2017,based on daily temperature observations from meteorological stations along the China–Nepal Highway(CNH),were calculated,and their spatial and temporal variation patterns were *** results showed that:(1)Both mean annual air temperature and mean annual ground surface temperature along the CNH fluctuated upward,with climate tendency rates of 0.43 and 0.52.C·(10a)~(-1),respectively;(2)The number of days with negative air temperature and ground temperature showed fluctuated downward,with change rates of-8.6 and-8.3 d·(10a)~(-1),respectively;(3)The ranges of air freezing index,air thawing index,ground freezing index,and ground thawing index over the years were 157.05-458.88°C·d,2034.20-2560.73°C·d,108.78-396.83°C·d,and 3515.25-4288.67°C·d,*** climate tendency rates were-5.42,10.22,-6.79,and 12.14.C·d·a-1,respectively,showing a general warming trend;(4)The air freezing index,ground freezing index,and ground thawing index changed abruptly in 1999,2000,and 2002,respectively,evincing significant changes after *** research results can provide a basis for the risk assessment of freezing–thawing erosion and the prevention and control of permafrost engineering diseases along the CNH.

关键词： China–Nepal Transportation Corridor China–Nepal Highway Freezing–thawing indices Spatio–temporal change

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Design of a Low-Energy Ion Implanter for Particle Radiation Testing of Materials in Space Application 14

Design of a Low-Energy Ion Implanter for Particle Radiation ...

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14th International Conference on reliability, Maintainability and Safety, ICRMS 2023

作者： Hao, Li Huiqi, Zheng Qiang, Yu Yuchuan, Peng Junfeng, Wang Shouqing, Huang Zhenyu, Tang Yong, Yang Qiongying, Ren Beijing Institute of Spacecraft Environment Engineering Science and Technology on Reliability and Environment Engineering Laboratory Beijing China Beijing Institute of Spacecraft Environment Engineering Beijing China

ISBN: (纸本)9798350329988

Ion implanters are widely utilized in particle radiation testing of materials within the context of space applications. Their primary purpose is to validate the reliability of materials exposed to space environment. A novel low-energy ion implanter is presently under development, featuring several distinctive attributes aimed at facilitating the production of an ion beam characterized by high uniformity, a substantial irradiation area, and sustained flux stability. The initial step involves the utilization of multi-circle arc-shaped hot cathodes to emit electrons. Subsequently, a multilayer concentric cylindrical electrode, interspersed with hot cathodes, is introduced within the ionization chamber. This configuration paves the way for the ion extraction electrode to extend into the ionization chamber. Finally, an automated adjustment method for regulating ion flux at the target stage is incorporated into the design. These enhancements collectively contribute to heightened efficiency and improved quality in particle radiation testing for materials. © 2023 IEEE.

关键词： Ionization chambers

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