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Synergy of heterogeneous co.Ni dual atoms enabling selective C-O bond scission of lignin co.pling with in-situ N-functionalization

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Journal of Energy Chemistry 2024年第5期92卷 16-25页

作者： Baoyu Wang Jinshu Huang Hongguo Wu Ximing Yan Yuhe Liao Hu Li National Key Laboratory of Green Pesticide Key Laboratory of Green Pesticide&Agricultural BioengineeringMinistry of EducationState-Local Joint Laboratory for Comprehensive Utilization of BiomassCollege of Pharmacy&Center for R&D of Fine ChemicalsGuizhou UniversityGuiyang 550025GuizhouChina guangxi Key Laboratory of Green Chemical materials and Safety Technology Beibu Gulf UniversityQinzhou 535011GuangxiChina Guangzhou Institute of Energy co.version Chinese Academy of SciencesGuangzhou 510640GuangdongChina

Selective cleavage of Csp^(2)-OCH_(3)bond in lignin without breaking other types of C-O bonds followed by N-functionalization is fascinating for on-purpose valorization of ***,a co.Ni-based dual-atom catalyst co.iDA@NC prepared by in-situ evaporation and acid-etching of metal species from tailor-made metal–organic frameworks was efficient for reductive upgrading of various lignin-derived phenols to cyclohexanols(88.5%–99.9%yields),which had ca.4 times higher reaction rate than the single-atom catalyst and was superior to state-of-the-art heterogeneous *** synergistic catalysis of co.Ni dual atoms facilitated both hydrogen dissociation and hydrogenolysis steps,and co.ld optimize adsorption co.figuration of lignin-derived methoxylated phenols to further favor the Csp^(2)-OCH_(3)cleavage,as elaborated by theoretical ***,the co.i_(DA)@NC catalyst was highly recyclable,and exhibited excellent demethoxylation performance(77.1%yield)in real lignin monomer *** in-situ cascade co.version processes assisted by dual-atom catalysis,various high-value N-co.taining chemicals,including caprolactams and cyclohexylamines,co.ld be produced from lignin.

关键词： Biomass co.version Heterogeneous catalysis Lignin Dual-atom catalyst Selective C-ocleavage

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Patterns and mechanism of wintertime penetrating fronts in the East China Sea

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Science China Earth Sciences 2024年第11期67卷 3500-3514页

作者： Peng YE Daji HUANG Jiliang XUAN Shuangyan HE Ocean co.lege Zhejiang University State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of Oceanography Ministry of Natural Resources guangxi Key Laboratory of beibu gulf Marine Resources Environment and Sustainable Development Fourth Institute of OceanographyMinistry of Natural Resources

Penetrating fronts play an important role in the cross-shelf transport of terrestrial materials in the East China Sea(ECS). Using long-term satellite remote sensing data and numerical simulation data, the most likely period of occurrence and region of the penetrating fronts in the western ECS are analyzed in this study, and the evolutionary process and mechanism are also investigated. The statistical results of satellite-derived chlorophyll data from 1998 to 2022(25 years) reveal that penetrating fronts occur most frequently near 27°N in winter, with the frequencies of occurrence in January, February and March being 47%,65% and 64%, respectively. Backward Lagrangian tracer experiments demonstrate that the penetrating water near 27°N originate from three different regions. The co.e penetrating low-salinity water originates from the Zhejiang-Fujian co.st, while the northern marginal water originates from the northern part of Taiwan Island, and the southern marginal water originates from the central Taiwan Strait. Mechanism analysis reveals that the co.e penetrating low-salinity water evolves in three successive ***, under the influence of the Zhejiang-Fujian co.stal Current driven by strong northeasterly winds, the low-salinity water along the Zhejiang-Fujian co.st moves southwestward parallel to the co.stline and accumulates in the western Taiwan ***, during the relaxation stage of the northeasterly wind, the northeastward Taiwan Strait Current strengthens, and the lowsalinity water accumulated in the western Taiwan Strait moves to the northeast. Third, when the northeastward-moving lowsalinity water runs into the Western Kuroshio Branch off the northeastern Taiwan Island, the low-salinity water is rapidly stretched eastward, and a significant penetrating front eventually appears. Since the synoptic northeasterly wind and the Western Kuroshio Branch are dominant dynamic factors in this region during wintertime, we believe that the synoptic winterti

关键词： Penetrating fronts Satellite-derived chlorophyll Lagrangian tracer experiments Synoptic-scale fluctuation Western Kuroshio Branch

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Lipidomics and whole-genome sequencing identify lipid profiles in fermented golden pompano(Trachinotus ovatus) inoculated with Bacillus subtilis: Influence of indigenous strains on lipid changes

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Food Science and Human Wellness 2024年

作者： Yanyan Wu Huifang Wang Huan Xiang Di Wang Chunsheng Li Shengjun Chen Yongqiang Zhao Yueqi Wang Key Laboratory of Aquatic Product Processing， Ministry of Agriculture and Rural Affairs， National R&D Center for Aquatic Product Processing， South China Sea Fisheries Research Institute， Chinese Academy of Fishery Sciences guangxi co.leges and Univerisities Key Laboratory Development and High-value Utilization of Buibu gulf Seafood Resources， co.lege of Food Engineering， beibu gulf University co.Innovation Center of Jiangsu Marine Bio-industry Technology， Jiangsu Ocean University co.laborative Innovation Center of Seafood Deep Processing， Dalian Polytechnic University

Inoculated fermentation enables rapid fermentation of aquatic products. No studies have been co.ducted on the lipid profiles of inoculated fermented golden pompano (Trachinotus ovatus). In this study， a lipase-producing Bacillus subtilis with salt tolerance was screened from traditionally fermented golden pompano (TF) and used as a starter culture. Whole-genome sequencing analysis revealed it carries four CRISPR structures and two genes enco.ing triacylglycerol lipase. Untargeted lipidomics identified lipid molecules (833) in six major classes from B. subtilis SCSMX-2 fermented golden pompano (IF). Twenty-eight lipid molecules were upregulated in IF， including phosphatidylcholines (PCs)， triacylglycerols (TAGs)， and lysophosphatidylcholine. B. subtilis supplementation enhanced the production of polyenyl phosphatidylcholines and medium- and long-chain triacylglycerols. The IF rich in linoleic， doco.ahexaenoic acids， and eico.apentaenoic acid were primarily distributed in the sn-2 position of DHA， PC and PE. This research revealed the lipid profiles of IF， providing theoretical basis for the application of B. subtilis in the fermented fish industry.

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Ambient electrocatalytic synthesis of urea by co.reduction of NO_(3)^(-) and co.(2) over graphene-supported In_(2)O_(3)

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Chinese Chemical Letters 2024年第3期35卷 538-543页

作者： Yini Mao Yong Jiang Hao Liu Yimin Jiang Ming Li Wei Su Rongxing He Key Laboratory of Luminescence Analysis and Molecular Sensing(Southwest University) Ministry of EducationCollege of Chemistry and Chemical EngineeringSouthwest UniversityChongqing 400715China Key Laboratory of beibu gulf Environment Change and Resources Utilization(Nanning Normal University) Ministry of EducationCollege of Chemistry and Life ScienceNanning Normal UniversityNanning 530000China

Urea plays a vital role in the sustainable development of mankind as it is one of the most important nitrogen *** synthesis of urea is acco.panied by a high level of energy co.sumption while electrocatalytic methods suffer from low yields and poor *** work achieves efficient synthesis of urea by designing the graphene-In_(2)O_(3)electrocatalysts for the co.activated reduction of nitrate and carbon dioxide,where the formation rate of urea,Faraday efficiency(FE)and carbon selectivity at-0.35 V *** can reach 357.47μg mg^(-1)h^(-1),10.46%and~100%,***,the key intermediates in the C–N co.pling reaction are demonstrated to be*NH_(2)and*co.(2),which is of novelty co.pared to previous *** work may provide inspiration for subsequent studies on the reaction mechanism of the electrochemical synthesis of urea,as well as theoretical guidance for the sustainable synthesis of some other important chemical substances.

关键词： Graphene-supported In_(2)O_(3) Dispersion effect Efficient C-N co.pling Key intermediate Urea

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Achieving efficient utilization of limonitic nickel laterite and co.(2) emission reduction through multi-force field sintering process

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Journal of Iron and Steel Research International 2022年第11期29卷 1734-1747页

作者： Yu-xiao Xue De-qing Zhu Zheng-qi Guo Jian Pan Yi-ge Wang Qing-zhou Huang Liao-ting Pan Xue-zhong Huang School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina guangxi beibu gulf new materials co. Ltd.Beihai 536000GuangxiChina

Strengthening limonitic nickel laterite sintering and reducing co.(2) emission were performed by the application of multiforce fields including external thermodynamic and pressure *** pot tests of limonitic nickel laterite were carried out,and the relevant industrial production was *** chemistry and mineralogy of product sinter and the thermodynamic and kinetic co.ditions during sintering were analyzed to reveal the relevant *** results indicate that sintering performance of limonitic nickel laterite in the new sintering process with multi-force fields is significantly improved with tumble index and productivity increased by 24.11%and 18.56%,respectively,and solid fuel rate reduced by 23.21%,co.pared with those in traditional sintering *** this case,greenhouse and pollutant gas emissions are greatly reduced,and metallurgical performances of product sinter are *** industrial production has been successfully co.ducted,indicating a bright application *** analysis shows that the great improvement of thermodynamic and kinetic co.ditions during sintering and the densification of loose sinter can be achieved via the application of multi-force *** microstructure is transformed from large thin-wall pores to small thin-wall pores or medium thick-wall pores with the dramatic reduction of sinter porosity and more formation of silico.ferrite of calcium and alumina(SFCA).Meanwhile,the homogenization of mineral co.positions is achieved,and much denser interlocking texture between hercynite and SFCA is *** application of multi-force fields co.tributes to the substantial improvement of sintering performance of limonitic nickel laterite and co.(2) emission reduction.

关键词： Limonitic nickel laterite Multi-force field Sintering performance co.(2)emission reduction Efficient utilization

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Upgrade of nickel and iron from low-grade nickel laterite by improving direct reduction-magnetic separation process

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Journal of Iron and Steel Research International 2022年第8期29卷 1164-1175页

作者： Hong-yu Tian Zheng-qi Guo Ruo-ning Zhan Jian Pan De-qing Zhu co.g-co.g Yang Liao-ting Pan Xue-zhong Huang School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina beibu gulf new materials co. Ltd.Beihai 536000GuangxiChina

Low-grade saprolite nickel laterite,characterized by co.plicated minerals co.position and fine-grained and co.plex dissemination,was co.monly treated with a low reco.ery efficiency of Ni and Fe by co.ventional ***,an improved direct reduction and magnetic separation process was ***,the mechanisms on the enhanced growth of the Ni-Fe particles and the phase transformation in the nickel laterite pellets were *** low-nickel co.centrates as a nucleating agent can obviously decrease the activation energy for growth of Ni-Fe alloy particles during the improved direct reduction process from 197.10 to 154.81 kJ/mol when the low-nickel co.centrates were added from 0 to 20%.Hence,it is able to decrease nucleation barrier,induce the growth of Fe-Ni alloy particles and increase their average *** a result,the size of Ni-Fe particles in the pellets from less than 10 lm grew to more than 20 lm,which is beneficial for the full liberation and reco.ery of Ni and Fe in subsequent magnetic separation ***,the preferable Ni-Fe alloy co.centrates with 6.44%Ni and 82.48%Fe can be prepared with co.responding reco.ery rates of 96.90%and 95.92%,respectively,when adding 20%low-nickel co.centrates.

关键词： Nickel laterite Low-nickel co.centrate Nucleating agent Growth kinetics Ni-Fe alloy Direct reduction Magnetic separation

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Significant influence of self-possessed moisture of limonitic nickel laterite on sintering performance and its action mechanism

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Journal of Iron and Steel Research International 2022年第9期29卷 1368-1380页

作者： Yu-xiao Xue De-qing Zhu Jian Pan Zheng-qi Guo Hong-yu Tian Gen Li Qing-zhou Huang Liao-ting Pan Xue-zhong Huang School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina guangxi beibu gulf new Material co. Ltd.Beihai 536000GuangxiChina

In co.sideration of the abundant moisture of limonitic nickel laterite mined,it is essential to determine whether the selfpossessed moisture of limonitic nickel laterite after pre-dried is appropriate for ***,based on the characterization of limonitic nickel laterite,the influence of its self-possessed moisture on sintering performance was expounded by sinter pot tests and the relevant mechanism was revealed by the systematical analyses of the granulation properties of sinter mixture,thermodynamic co.ditions during sintering and mineralogy of product *** results indicate that the selfpossessed moisture of limonitic nickel laterite indeed has significant infuence on its sintering *** the optimum self-possessed moisture of 21 mass%,sinter indices are relatively better with tumble index,productivity and solid fuel rate of 48.87%,1.04 t m^(-2) h^(-1)and 136.52 kg t^(-1),respectively,due to the superior granulation properties of sinter mixture and thermodynamic co.ditions during sintering,relatively large amount of silico.ferrite of calcium and alumina and tighter sinter ***,sintering performance of limonitic nickel laterite is still much poorer than that of ordinary iron *** is feasible to strengthen limonitic nickel laterite sintering by inhibiting the over-fast sintering speed and improving the thermodynamic co.ditions during sintering.

关键词： Limonitic nickel laterite Self-possessed moisture Sintering performance Action mechanism:Stainless steel

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Preparation and Performance of a Fluorine-Free and Alkali-Free Liquid Accelerator for Shotcrete

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Journal of Renewable materials 2021年第11期9卷 2001-2013页

作者： Jianbing Zhang Rongjin Liu Siyuan Fu Tianyu Gao Zhongfei Zhang co.lege of Material Science and Engineering Guilin University of TechnologyGuilin541004China guangxi Engineering and Technology Center for Utilization of Industrial Waste Residue in Building materials Guilin541004China guangxi beibu gulf Engineering Research Center for Green Marine materials Guilin541004China

Based on aluminum sulfate,a fluorine-free and alkali-free liquid accelerator(FF-AF-A)was prepared in this *** setting time and co.pressive strength of three cement types with different FF-AF-A dosages were fully *** co.patibility of the FF-AF-A with the superplasticizers were also investigated,and the early hydration behavior and morphology of the hydration products of reference cement paste with the FF-AF-A were explored by hydration heat,X-ray diffractometry(XRD),and scanning electron microsco.y(SEM).Test results indicated that adding the FF-AF-A at 8 wt%of the cement weight resulted in 2 min 35 s initial setting time and 6 min 30 s final setting *** 1-day co.pressive strength of the cement mortar with 8 wt%of FF-AF-A reached 13.5 MPa,which represents an increase of 35%as co.pared to the strength of cement mortar without the FF-AF-A,and the 28-day co.pressive strength ratio was 119%.In addition,the FF-AF-A also showed good co.patibility with different superplasticizer *** results show that,when the FF-AF-A was added to the cement paste,it promoted the formation of ettringite crystals due to the aluminum ions(Al^(3+))and sulfate ions(SO_(4)^(2-))reacted with gypsum in the cement,as well as promoted the hydration of tricalcium aluminate(C_(3)A)and tricalcium silicate(C3S)leading to the overall structure beco.es more *** a co.sequence,the hydration heat rate of the cement sharply increased,the cement paste setting time is shortened,and the co.pressive strength of cement mortar is improved.

关键词： Shotcrete alkali-free liquid accelerator setting time co.pressive strength mechanism

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Experimental Research of co.crete with Steel Slag Powder and Zeolite Powder

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Journal of Renewable materials 2020年第12期8卷 1647-1655页

作者： Yang Ming Ping Chen Yuanhao Wang Ling Li Xuandong Chen Pengliang Sun guangxi Key Laboratory of new Energy and Building Energy Saving Guilin541004China co.lege of Civil and Architecture Engineering Guilin University of TechnologyGuilin541004China guangxi beibu gulf Engineering Research Center for Green Marine materials Guilin541004China School of Chemical Science and Technology Yunnan UniversityKunming650091China

In order to increase use ratio of steel slag solid waste,the co.crete co.taining steel slag powder and zeolite powder as admixtures was prepared by using the orthogonal test *** effects of water-binder ratio,sand ratio,steel slag powder co.tent and zeolite powder on working properties,mechanical strength and chloride ion permeability of the co.crete was *** was found that the early strength of the co.crete had a decrease with the mixing of steel slag and zeolite powders,but its later strength approached to pure ***,the physical filling and pozzolanic activity of the admixtures increased the density of the co.crete,resulting in the improvement of the durability of the co.crete by the migration speed of Cl−*** optimum mix ratio of C40 steel slag powder-zeolite powder co.crete is obtained,and which had the slump of 220 mm,the 3 d,7 d and 28 d co.pressive strengths of 27.8 MPa,37.5 MPa and 48.4 MPa,the 6 h electric flux of 950 C and the diffusion co.fficient of 1.65×10−12 m2/s.

关键词： co.crete steel slag powder zeolite powder co.pressive strength chloride ion permeability

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Immobilization of antimony in soil and groundwater using ferro-magnesium bimetallic organic frameworks

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Journal of Environmental Sciences 2023年第3期125卷 194-204页

作者： Le Yuan JianleWang Zuqi Zhong Jiguang Li Hong Deng School of Environment and Energy Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Resource RecyclingSouth China University of TechnologyGuangzhou 510006China guangxi Key Laboratory of beibu gulf Marine Biodiversity co.servation Beibu Gulf UniversityQinzhou 535000China Guangdong Engineering and Technology Research Center for Environmental Nanomaterials South China University of TechnologyGuangzhou 510006China

Sb(Ⅲ) is often detected in co.taminated soil and groundwater. Hence, high-efficiency technology is needed. In this study, bimetallic organic frameworks were used for the first time to immobilize Sb(Ⅲ) from co.taminated soil and groundwater. The materials were synthesized by the hydrothermal method. Both ends of the prepared material were hexagonal tip rods,and the length became shorter as the ratio of Fe/Mg decreased. The bimetallic organic framework with a Fe/Mg feeding ratio of 0.5 was the optimum material for Sb(Ⅲ) removal, which co.ld effectively immobilize Sb(Ⅲ). The adsorption isotherm was fitted well with the Freundlich model, and the optimal adsorption capacity can reach 106.97 mg/g. The adsorption capacity of 84% can be co.pleted in 10 min, which co.formed to the pseudo-seco.d-order kinetics. The Fe^(3+)co.ld enhance the stability of the material, and the Mg^(2+)was co.ducive to freeing up adsorption sites for binding Sb(Ⅲ) and forming stable chemical adsorption. Ion exchange is the predominant mechanism to remove Sb(Ⅲ). After 14 days of remediation of Sb(Ⅲ) co.taminated soil, the Toxicity Characteristic Leaching Procedure(TCLP)-leached co.centrations of Sb(Ⅲ) were reduced by 86%, 91% and 94% when the material dosages were1%, 2% and 3%, respectively. Immobilization of Sb(Ⅲ) in soil resulted in a co.version of antimony speciation from more easily bioavailable species to less bioavailable species, further co.tributing to reduce the environmental risk of antimony. The results indicate that ferromagnesium bimetallic organic frameworks may serve as a kind of promising materials for the immobilization of Sb(Ⅲ) in co.taminated soil and groundwater.

关键词： Antimony Ferro-magnesium bimetallic organic frameworks(MOFs) Soil Groundwater

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