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Mechanistic insight into Cr(Ⅵ)retention by Si-containing ferrihydrite

Journal of Environmental sciences 2024年第5期139卷 217-225页

作者： Ying Hu Qiang Xue Honghan Chen Huaming Guo Kenneth C.Carroll Song Wang MOE key Laboratory of Groundwater Circulation and Environmental Evolution School of Water Resources and EnvironmentChina University of Geosciences(Beijing)Beijing 100083China Beijing key Laboratory of Water Resources and Environmental Engineering School of Water Resources and EnvironmentChina University of GeosciencesBeijing 100083China State key Laboratory of Biogeology and Environmental Geology China University of GeosciencesBeijing 100083China Plant&Environmental science New Mexico State UniversityNM 88003USA Institute of Theoretical Chemistry College of ChemistryJilin UniversityChangchun 130023China

Hexavalent chromium[Cr(Ⅵ)]causes serious harm to the environment due to its high toxicity,solubility,and ***(Fh)are the main adsorbent and trapping agent of Cr(Ⅵ)in soils and aquifers,and they usually coexist with silicate(Si),forming Si-containing ferrihydrite(Si-Fh)***,the mechanism of Cr(Ⅵ)retention by Si-Fh mixtures is poorly *** this study,the behaviors and mechanisms of Cr(Ⅵ)adsorption onto Si-Fh with different Si/Fe molar ratios was *** electron microscope,Fourier transform infrared spectroscopy,X-ray diffraction,X-ray photoelectron spectroscopy,and other techniques were used to characterize Si-Fh and Cr(Ⅵ)-loading of *** results show that specific surface area of Si-Fh increases gradually with increasing Si/Fe ratios,but Cr(Ⅵ)adsorption on Si-Fh decreases with increasing Si/Fe *** is because with an increase in Si/Fe molar ratio,the point of zero charge of Si-Fh gradually decreases and electrostatic repulsion between Si-Fh and Cr(Ⅵ)***,the complexation of Cr(Ⅵ)is enhanced due to the increase in adsorbed hydroxyl(A-OH-)on Si-Fh with increasing Si/Fe molar ratio,which partly counteracts the effect of the electrostatic ***,the increase in the electrostatic repulsion has a greater impact on adsorption than the additional complexation with *** functional theory calculation further supports this observation,showing the increases in electron variation of bonding atoms and reaction energies of inner spherical complexes with the increase in Si/Fe ratio.

关键词： Hexavalent chromium Ferrihydrite Si/Fe ratio Cr(Ⅵ)Adsorption

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Efficient activation of the Co/SBA-15catalyst by high-frequency AC-DBD plasma thermal effects for toluene removal

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Plasma science and technology 2024年第8期26卷 84-94页

作者：李越姜楠刘政妍秦亮彭邦发王荣刚孙玉荣李杰 School of Environment Dalian University of TechnologyDalian 116024People’s Republic of China School of Electrical Engineering Dalian University of TechnologyDalian 116024People’s Republic of China College of Electrical and Power Engineering Taiyuan University of TechnologyTaiyuan 030024People’s Republic of China Canmax Technologies Co. Ltd.Suzhou 215121People’s Republic of China

Dielectric barrier discharge(DBD)plasma excited by a high-frequency alternating-current(AC)power supply is widely employed for the degradation of volatile organic compounds(VOCs).However,the thermal effect generated during the discharge process leads to energy waste and low energy utilization *** this work,an innovative DBD thermally-conducted catalysis(DBD-TCC)system,integrating high-frequency AC-DBD plasma and its generated thermal effects to activate the Co/SBA-15 catalyst,was employed for toluene ***,Co/SBA-15 catalysts are closely positioned to the ground electrode of the plasma zone and can be heated and activated by the thermal effect when the voltage exceeds 10 k ***12.4 k V,the temperature in the catalyst zone reached 261℃ in the DBD-TCC system,resulting in an increase in toluene degradation efficiency of 17%,CO_(2)selectivity of 21.2%,and energy efficiency of 27%,respectively,compared to the DBD system *** contrast,the DBD thermally-unconducted catalysis(DBD-TUC)system fails to enhance toluene degradation due to insufficient heat absorption and catalytic activation,highlighting the crucial role of AC-DBD generated heat in the activation of the ***,the degradation pathway and mechanism of toluene in the DBD-TCC system were *** work is expected to provide an energy-efficient approach for high-frequency AC-DBD plasma removal of VOCs.

关键词： high-frequency alternating-current power thermal effect dielectric barrier discharge toluene degradation Co/SBA-15 catalysts

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Identification and Analysis of the WRKY Transcription Factor Gene Family in Verbena bonariensis

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Phyton-International Journal of Experimental Botany 2024年第8期93卷 1875-1896页

作者： Dandan Yuan Ju Cai Tao Zhang Sisi Wang Xiuliu Yang Yan Li The key Laboratory of Plant Resources Conservation and Germplasm Innovation in Mountainous Region(Ministry of Education) Guizhou UniversityGuiyang550025China

The WRKY transcription factor gene family is one of the unique gene families in *** plays an important role in response to abiotic stresses such as cold and drought,hormone signal transduction,regulation of biosynthesis,leaf senescence seed germination,***,little information is available about WRKY transcription factors in Verbena *** this study,70 VbWRKY genes were identified from the whole *** phylogenetic analysis of the WRKY gene family in *** and Arabidopsis shows that the WRKY genes in *** can be divided into three groups:I,II,and III,which contain 13,47,and 10 members,*** II can be further divided into five subclasses:IIa(5),IIb(10),IIc(18),IId(6),and IIe(8).Conservative motif analysis showed that 64 proteins encoded by the VbWRKY gene had conserved motifs 1,2 and 3,and the same subclass motif elements were approximately the *** collinearity analysis showed that there were 44 homologous gene pairs among the VbWRKYs,and these homologous gene pairs may have the same *** sequence analysis showed that the VbWRKY gene has multiple cis-acting elements,including not only cis-acting elements related to low-temperature and light responses,but also cis-acting elements related to hormone regulation,Among them,most VbWRKY genes contain response elements about low-temperature,and 30 VbWRKY genes contain low-temperature response elements(LTR),and 61 VbWRKY genes contain abscisic acid response elements(ABRE),indicating that VbWRKY plays a crucial role in plant growth and abiotic *** to the expression of VbWRKY in the cold stress and different tissues transcriptome,70 VbWRKY genes played their respective roles in various tissues and stages to regulate plant growth,Also,some of them participated in the process of cold stress tolerance,52 VbWRKYs showed significant differences in expression under cold stress,and 37 VbWRKY genes were up-regulated under cold stress.9 VbWRKY genes w

关键词： Verbena bonariensis WRKY gene family cold resistance

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Waking Up Brain with Electrical Stimulation to Boost Memory in Sleep:A Neuroscience Exploration

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Neuroscience Bulletin 2024年第6期40卷 852-854页

作者： Zhe Zhong Fuling Yan Chunming Xie Department of Neurology School of MedicineAffiliated Zhongda HospitalSoutheast UniversityNanjing210009China Institute of Neuropsychiatry Affiliated Zhongda HospitalSoutheast UniversityNanjing210009China The key Laboratory of Developmental Genes and Human Disease Southeast UniversityNanjing210009China

Imagine that,in the future,you could enhance your memory by applying a mild electric current to your brain during *** might sound like science fiction,but it is based on cutting-edge neuroscience *** is widely recognized as a crucial factor for long-term memory consolidation,but the exact mechanisms by which the brain coordinates neural activity across different regions during sleep to reorganize and integrate memories are unknown[1,2].

关键词： Sleep integrate applying

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Multistep continuous flow synthesis of Erlotinib

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Chinese Chemical Letters 2024年第4期35卷 371-375页

作者： Hui Jin Qin Cai Peiwen Liu Yan Chen Derong Wang Weiping Zhu Yufang Xu Xuhong Qian State key Laboratory of Bioreactor Engineering Shanghai Key Laboratory of Chemical BiologySchool of PharmacyEast China University of Science and TechnologyShanghai 200237China

Erlotinib is an orally administered, highly effective, specific epidermal growth factor receptor tyrosine kinase inhibitor, used to treat non-small cell lung cancer and pancreatic cancer. The traditional synthetic methods for Erlotinib exhibit long reaction time and safety concern. Herein, we describe a novel five-step route for the synthesis of Erlotinib in flow. These five steps comprise etherification, nitration, reduction,addition and cyclization reactions. All steps were optimized and converted to continuous flow process,which drastically reduces the reaction time and considerably improves the process safety as well as the total yield. Enabled by five continuous flow units, Erlotinib is efficiently afforded with an E-factor of 38,an overall yield of 83%, and a total residence time of 25.1 min. Majority steps in this process have been optimized for quantitative conversion, which offers the possibility of telescoping the entire process.

关键词： Erlotinib Continuous flow synthesis Microchannel flow reactor Process optimization Continuous nitration Continuous hydrogenation

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Dietary supplementation of benzoic acid and essential oils combination enhances intestinal resilience against LPS stimulation in weaned piglets

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Journal of Animal science and Biotechnology 2024年第2期15卷 878-897页

作者： Chang Cui Yulong Wei Yibo Wang Wen Ma Xiaoyu Zheng Jun Wang Ziwei Ma Caichi Wu Licui Chu Shihai Zhang Wutai Guan Fang Chen Guangdong Provincial key Laboratory of Animal Nutrition Control College of Animal ScienceSouth China Agricultural UniversityGuangzhou 510642China College of Animal science and national Engineering Research Center for Breeding Swine Industry South China Agricultural UniversityGuangzhou 510642China Guangdong Laboratory for Lingnan Modern Agriculture South China Agricultural UniversityGuangzhou 510642China

Background The benefits of combining benzoic acid and essential oils(BAO)to mitigate intestinal impairment during the weaning process have been well established,while the detailed underlying mechanism has not been fully *** research has primarily focused on the reparative effects of BAO on intestinal injury,while neglecting its potential in enhancing intestinal stress *** In this study,we investigated the pre-protective effect of BAO against LPS-induced stress using a modified experimental *** were pre-supplemented with BAO for 14 d,followed by a challenge with LPS or saline to collect blood and intestinal *** Our findings demonstrated that BAO supplementation led to significant improvements in piglets’final weight,average daily gain,and feed intake/body gain ***,BAO supplementation positively influenced the composition of intestinal microbiota,increasing beneficial Actinobacteriota and Alloprevotella while reducing harmful Desulfobacterota,Prevotella and ***,BAO supplementation effectively mitigated oxidative disturbances and inflammatory responses induced by acute LPS *** was evidenced by elevated levels of T-AOC,SOD,and GSH,as well as decreased levels of MDA,TNF-α,and IL-6 in the ***,piglets subjected to LPS challenge and pre-supplemented with BAO exhibited significant improvements in intestinal morphological structure and enhanced integrity,as indicated by restored expression levels of Occludin and Claudin-1 compared to the non-supplemented *** analysis revealed that BAO supplementation enhanced the jejunal antioxidative capacity by increasing GSH-Px levels and decreasing MDA levels under the LPS challenge and stimulated the activation of the Nrf2 signaling ***,the reduction of TLR4/NF-κB/MAPK signaling pathways activation and proinflammatory factor were also observed in the jejunal of those piglets fed with ***

关键词： Anti-stress Benzoic acid Essential oils Intestine LPS Weaned piglets

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Global Dynamic Responses and Progressive Failure of Submerged Floating Tunnel Under Cable Breakage Conditions

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China Ocean Engineering 2024年第4期38卷 676-688页

作者： ZHOU Xiang-bo QIAO Dong-sheng WANG Ming TANG Guo-qiang LU Lin OU Jinping State key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China

The Submerged Floating Tunnel(SFT)relies on a tensioned mooring system for precise *** sudden breakage of a single cable can trigger an immediate alteration in the constraint conditions of the tube,inducing a transient heave response within the structure along with a transient increase in cable tension experienced by adjacent *** more severe cases,this may even lead to a progressive failure culminating in the global destruction of the *** study used ANSYS/AQWA to establish a numerical model of the entire length SFT for the hydrodynamic response analysis,and conducted a coupled calculation of the dynamic responses of the SFT-mooring line model based on Orca Flex to study the global dynamic responses of the SFT at the moment of cable breakage and the redistribution of cable internal *** most unfavorable position for SFT cable breakage was identified,the influence mechanism of cable breakage at different positions on the global dynamic response was revealed,and the progressive chain failure pattern caused by localized cable breakage are also clarified.

关键词： submerged floating tunnel cable breakage global dynamic responses progressive failure

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Alloy design for laser powder bed fusion additive manufacturing:a critical review

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International Journal of Extreme Manufacturing 2024年第2期6卷 29-63页

作者： Zhuangzhuang Liu Qihang Zhou Xiaokang Liang Xiebin Wang Guichuan Li Kim Vanmeensel Jianxin Xie key Laboratory for Advanced Materials Processing(MOE) Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083People’s Republic of China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083People’s Republic of China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083People’s Republic of China Capital Aerospace Machinery Corporation Limited Beijing 100076People’s Republic of China key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong UniversityJingshi Road 17923Jinan 250061People’s Republic of China Department of Materials Engineering KU LeuvenLeuven 3001Belgium

Metal additive manufacturing(AM)has been extensively studied in recent *** the significant progress achieved in manufacturing complex shapes and structures,challenges such as severe cracking when using existing alloys for laser powder bed fusion(L-PBF)AM have *** challenges arise because commercial alloys are primarily designed for conventional casting or forging processes,overlooking the fast cooling rates,steep temperature gradients and multiple thermal cycles of *** address this,there is an urgent need to develop novel alloys specifically tailored for L-PBF *** review provides a comprehensive summary of the strategies employed in alloy design for *** aims to guide future research on designing novel alloys dedicated to L-PBF instead of adapting existing *** review begins by discussing the features of the L-PBF processes,focusing on rapid solidification and intrinsic heat ***,the printability of the four main existing alloys(Fe-,Ni-,Al-and Ti-based alloys)is critically assessed,with a comparison of their conventional *** was found that the weldability criteria are not always applicable in estimating ***,the review presents recent advances in alloy development and associated strategies,categorizing them into crack mitigation-oriented,microstructure manipulation-oriented and machine learning-assisted ***,an outlook and suggestions are given to highlight the issues that need to be addressed in future work.

关键词： laser powder bed fusion alloy design printability crack mitigation

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Waste acid recovery utilizing monovalent cation permselective membranes through selective electrodialysis

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Chinese Journal of Chemical Engineering 2024年第7期71卷 45-57页

作者： Yanran Zhu Yue Zhou Qian Chen Rongqiang Fu Zhaoming Liu Liang Ge Tongwen Xu Anhui Provincial Engineering Laboratory of Functional Membrane Materials and technology Department of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China key Laboratory of Charged Polymeric Membrane Materials of Shandong Province Shandong Tianwei Membrane Technology Co.Ltd.Weifang 261000China

Selective electrodialysis(SED)has surfaced as a highly promising membrane separation technique in the realm of acid recovery owing to its ability to effectively separate monovalent ions through the utilization of a potential ***,the current SED process is limited by conventional commercial monovalent cation permselective membranes(MCPMs).This study systematically investigates the use of an independently developed MCPM in the SED process for acid *** factors such as current density,volume ratio,initial ion concentration,and waste acid systems are *** independently developed MCPM offers several advantages over the commercial monovalent selective cation-exchange membrane(CIMS),including higher recovered acid concentration,better ion flux ratio,improved acid recovery efficiency,increased recovered acid purity,and higher current *** SED process with the MCPM achieves a recovered acid of 95.9%and a concentration of 2.3 mol·L^(–1) in the HCl/FeCl_(2) system,when a current density of 20 mA·cm^(-2) and a volume ratio of 1:2 are ***,in the H_(2)SO_(4)/FeSO_(4) system,a purity of over 99%and a concentration of 2.1 mol·L^(–1) can be achieved in the recovered *** study thoroughly examines the impact of operation conditions on acid recovery performance in the SED *** independently developed MCPM demonstrates outstanding acid recovery performance,highlighting its potential for future commercial utilization.

关键词： Selective electrodialysis Wastewater Monovalent cation permselective membranes Separation Recovery

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Experimental and numerical study on atmospheric-pressure air dielectric barrier discharge via 50 Hz/5000 Hz dual-frequency excitation

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High Voltage 2024年第2期9卷 391-402页

作者： Junwen He Bangfa Peng Guanglin Yu Ronggang Wang Nan Jiang Jie Li Yan Wu School of Electrical Engineering Dalian University of TechnologyDalianChina Canmax Technologies Co. Ltd.SuzhouChina

A dual-frequency(DF)dielectric barrier discharge,excited by the superposition of a 50 Hz low frequency(LF)and a 5000 Hz intermediate frequency(IF),is proposed to enhance *** effect of the LF voltage component on the breakdown behaviour of the DF discharge during different periods has been studied both experimentally and *** number of high-current pulses rises as the LF voltage *** statistical analysis shows that the number of the current pulse amplitude above 80 mA in the DF discharge reaches nearly 6 times that in the IF ***,the total discharge energy in the DF discharge is significantly higher than that in the IF *** simulation re-produces the temporal variation of the breakdown behaviours in the DF *** simulated results reveal that the maximal electric field strength of the breakdown process is greater in the DF discharge compared to the IF discharge during a half-period of ***,the comparison between the IF and DF discharges exhibits that the LF voltage regulates the accumulation of residual charged species on the dielectric surface after the breakdown by modulating the residual voltage between the air gap.

关键词： dielectric excitation excited

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