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A tunable ionic covalent organic framework platform for efficient CO_(2) catalytic conversion

Frontiers of chemical Science and engineering 2024年第1期18卷 25-36页

作者： Ting Li Ji Xiong Minghui Chen Quan Shi Xiangyu Li Yu Jiang Yaqing Feng Bao Zhang School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China Guangdong Laboratory of Chemistry and Fine Chemical Industry Jieyang Center Jieyang 522000China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

The cycloaddition reaction between epoxides and CO_(2) is an effective method to utilize CO_(2) *** organic frameworks(COFs)provide a promising platform for the catalytic CO_(2) transformations on account of their remarkable chemical and physical ***,a family of novel vinylene-linked ionic COFs named TE-COFs(TTE-COF,TME-COF,TPE-COF,TBE-COF)has been facilely synthesized from N-ethyl2,4,6-trimethylpyridinium bromide and a series of triphenyl aromatic aldehydes involving different numbers of nitrogen atoms in the central aromatic *** resulting catalyst TTE-COF with excellent adsorption capacity(45.6 cm3·g^(-1),273 K)exhibited outstanding catalytic performance,remarkable recyclability and great substrate ***,it was also observed that the introduction of nitrogen atom in the precursor led to a great improvement in the crystallinity and CO_(2) adsorption capacity of TE-COFs,thus resulting to a progressively improved catalytic *** work not only illustrated the influence of monomer nitrogen content on the crystallinity and CO_(2) adsorption capacity of TE-COFs but also provided a green heterogeneous candidate for catalyzing the cycloaddition between CO_(2) and epoxides,which shed a light on improving the catalytic performance of the CO_(2) cycloaddition reaction by designing the covalent organic frameworks structures.

关键词： CO_(2)cycloaddition nreaction covalent organic frameworks cyclic carbonate vinylene-linked synergetic effects

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Applications of protein engineering in the microbial synthesis of plant triterpenoids

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Synthetic and Systems Biotechnology 2023年第1期8卷 20-32页

作者： Yan Luo Yaozhu Jiang Linhao Chen Chun Li Ying Wang Key Laboratory of Medical Molecule Science and Pharmaceutics Engineering Institute of Biochemical EngineeringSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijingChina Key Laboratory for Industrial Biocatalysis Ministry of EducationDepartment of Chemical EngineeringTsinghua UniversityBeijingChina

Triterpenoids are a class of natural products widely used in fields related to medicine and health due to their biological activities such as hepatoprotection,anti-inflammation,anti-viral,and *** the advancement in biotechnology,microorganisms have been used as cell factories to produce diverse natural *** the significant progress that has been made in the construction of microbial cell factories for the heterogeneous biosynthesis of triterpenoids,the industrial production of triterpenoids employing microorganisms has been stymied due to the shortage of efficient enzymes as well as the low expression and low catalytic activity of heterologous proteins in *** engineering has been demonstrated as an effective way for improving the specificity,catalytic activity,and stability of the enzyme,which can be employed to overcome these *** review summarizes the current progress in the studies of Oxidosqualene cyclases(OSCs),cytochrome P450s(P450s),and UDP-glycosyltransferases(UGTs),the key enzymes in the triterpenoids synthetic *** main obstacles restricting the efficient catalysis of these key enzymes are analyzed,the applications of protein engineering for the three key enzymes in the microbial synthesis of triterpenoids are systematically reviewed,and the challenges and prospects of protein engineering are also discussed.

关键词： Oxidosqualene cyclase Cytochrome P450 UDP-Glycosyltransferase Triterpenoids Protein engineering

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Review on micro-mechanism of forming emulsification during rare earth extraction by acidic extractants

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Journal of Rare Earths 2025年第1期43卷 9-20,I0001页

作者： Jie Liu Yuxiu Zhao Zhirong Wang Minghui Jia Wenxiang Xia Guizhi Wu Wenda Guo Ru'an Chi Kun Huang School of Environmental and Municipal Engineering Qingdao University of TechnologyQingdao266100China Open Project of Key Laboratory of Green Chemical Engineering Process of Ministry of Education Wuhan Institute of Technologywuhan430205China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China

Solvent extraction is the main method used to separate and purify rare earth *** the process of rare earths extraction,emulsification often generated due to the instability of the aqueous and organic phases or improper operating *** emulsification occurs,it would not only lead to low rare earths recovery efficiency,small product quantities,high production costs and the losing of extractant and rare earth resources,but also result in serious environmental ***,it is very important to study the micro-mechanisms of emulsification and establish new methods to prevent emulsification at the *** this paper,possible factors resulting in emulsification,such as the compositions and properties of the organic and aqueous phases,the operating conditions of the rare earths extraction are *** micro-mechanisms of emulsification are summarized basing on the microscopic structures in the bulk phase,aggregations of the extractants at the organic-aqueous interface,spectral characterizations and computational *** this basis,new formation mechanisms are proposed for *** explorations are employed to verify the correctness of these new ***,future directions for studies of the emulsification micro-mechanism are *** study provides a theoretical basis for further understanding the micro-mechanisms of interfacial instability resulting in emulsification in the process of rare earths extraction.

关键词： Extraction Rare earths Emulsification Mechanism Interface

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Impact of Hard Segment Structures on Fatigue Threshold of Casting Polyurethane Using Cutting Method

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Chinese Journal of Polymer Science 2025年第2期43卷 303-315页

作者： Guang-Zhi Jin Le-Hang Chen Yu-Zhen Gong Peng Li Run-Guo Wang Fan-Zhu Li Yong-Lai Lu State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing100029China Engineering Research Center of Elastomer Materials Energy Conservation and Resources Ministry of EducationBeijing100029China Key Laboratory of Carbon Fiber and Functional polymers Beijing University of Chemical TechnologyBeijing100029China Center of Advanced Elastomer Materials College of Material Science and EngineeringBeijing University of Chemical TechnologyBeijing100029China

The fatigue resistance of casting polyurethane(CPU)is crucial in various sectors,such as construction,healthcare,and the automotive *** its importance,no studies have reported on the fatigue threshold of *** study employed an advanced Intrinsic Strength Analyzer(ISA)to evaluate the fatigue threshold of CPUs,systematically exploring the effects of three types of isocyanates(PPDI,NDI,TDI)that contribute to hard segment structures based on the cutting *** multiple advanced characterization techniques(XRD,TEM,DSC,AFM),the results indicate that PPDI-based polyurethane exhibits the highest fatigue threshold(182.89 J/m^(2))due to a highest phase separation and a densely packed spherulitic structure,although the hydrogen bonding degree is the lowest(48.3%).Conversely,NDI-based polyurethane,despite having the high hydrogen bonding degree(53.6%),exhibits moderate fatigue performance(122.52 J/m^(2)),likely due to a more scattered ***-based polyurethane,with the highest hydrogen bonding degree(59.1%)but absence of spherulitic structure,shows the lowest fatigue threshold(46.43 J/m^(2)).Compared to common rubbers(NR,NBR,EPDM,BR),the superior fatigue performance of CPU is attributed to its well-organized microstructure,polyurethane possesses a higher fatigue threshold due to its high phase separation degree and orderly and dense spherulitic structure which enhances energy dissipation and reduces crack propagation.

关键词： Casting polyurethane Fatigue threshold Cutting method Hard segment structures Materials characterization

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Electrolyte and interphase engineering through solvation structure regulation for stable lithium metal batteries

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Chinese chemical Letters 2023年第12期34卷 401-408页

作者： Hai Su Haikuo Zhang Zifeng Chen Mengjie Li Jiwei Zhao Haiyan Xun Jie Sun Yunhua Xu School of Materials Science and Engineering Key Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education)and Tianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin 300072China State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Lithium metal batteries(LMBs)are considered to be one of the most promising high-energy-density battery ***,their practical application in carbonate electrolytes is hampered by lithium dendrite growth,resulting in short cycle ***,an electrolyte regulation strategy is developed to improve the cyclability of LMBs in carbonate electrolytes by introducing LiNO3 using trimethyl phosphate with a slightly higher donor number compared to NO_(3)^(-)as a *** not only allows the formaion of Li^(+)-coordinated NO3 but also achieves the regulation of electrolyte solvation structures,leading to the formation of robust and ion-conductive solid-electrolyte interphase films with inorganic-rich inner and organic-rich outer layers on the Li metal *** a result,high Coulombic efficiency of 99.1%and stable plating/stripping cycling of Li metal anode in LilCu cells were ***,excellent performance was also demonstrated in Li||LiNi_(0.83)Co_(0.11)Mn_(0.06)O_(2)(NCM83)full cells and Cul/NCM83 anodefree cells using high mass-loading *** work provides a simple interphase engineering strategy through regulating the electrolyte solvation structures for high-energy-density LMBs.

关键词： Lithium metal batteries Lithium nitrate Trimethyl phosphate Solvation structures Solid-electrolyte interphases

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Simultaneous synthesis of heat-integrated water networks by a nonlinear program:Considering the wastewater regeneration reuse

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Chinese Journal of chemical engineering 2022年第4期35卷 402-411页

作者： Fangyou Yan Wei Li Jinli Zhang School of Chemical Engineering and Material Science Tianjin University of Science and TechnologyTianjin 300457China Key Laboratory for Green Chemical Technology MOE School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Key Laboratory of Systems Bioengineering MOE School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Heat-integrated water network synthesis(HIWNS)has received considerable attention for the advantages of reducing water and energy *** is effective in water and energy *** integer non-linear programming(MINLP)is usually applied in *** this work,a novel nonlinear programming(NLP)was proposed for HIWNS by considering wastewater reuse and wastewater regeneration *** variables are changed to non-linear equation by the methods for identifying stream roles and denoting the existence of process *** model is tested by examples with single and multiple regeneration unit *** testing results showed that the NLP is an alternative method for HIWNS with wastewater reuse and regeneration reuse.

关键词： None-linear programming Heat-integrated water network synthesis Wastewater regeneration reuse

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Immobilization of laccase on organic–inorganic nanocomposites and its application in the removal of phenolic pollutants

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Frontiers of chemical Science and engineering 2023年第7期17卷 867-879页

作者： Wei Zhang Runtang Liu Xu Yang Binbin Nian Yi Hu State Key Laboratory of Materials-Oriented Chemical Engineering School of Pharmaceutical SciencesNanjing Tech UniversityNanjing 210009China

Polydopamine-functionalized nanosilica was synthesized using an inexpensive and easily obtainable raw material,mild reaction conditions,and simple ***,a flexible spacer arm was introduced by using dialdehyde starch as a cross-linking agent to bind with laccase.A high loading amount(77.8 mg∙g^(‒1))and activity retention(75.5%)could be achieved under the optimum immobilization *** parameters showed that the immobilized laccase had a lower thermal deactivation rate constant and longer *** enhancement of thermodynamic parameters indicated that the immobilized laccase had better thermal stability than free *** residual activity of immobilized laccase remained at about 50.0%after 30 days,which was 4.0 times that of free *** laccase demonstrated excellent removal of phenolic pollutants(2,4-dichlorophenol,bisphenol A,phenol,and 4-chlorophenol)and perfect reusability with 70% removal efficiency retention for 2,4-dichlorophenol after seven *** results suggested that immobilized laccase possessed great reusability,improved thermal stability,and excellent storage ***–inorganic nanomaterials have a good application prospect for laccase immobilization,and the immobilized laccase of this work may provide a practical application for the removal of phenolic pollutants.

关键词： polydopamine pollutant removal thermodynamic phenolic pollutants immobilized laccase

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CuO/Co_(3)O_(4)Bifunctional Catalysts for Electrocatalytic 5-Hydroxymethylfurfural Oxidation Coupled Cathodic Ammonia Production

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Energy & Environmental Materials 2024年第5期7卷 255-262页

作者： Li Zhang Peiyue Jin Ze Wu Bo Zhou Junchang Jiang Aomeng Deng Qiuyue Li Tanveer Hussain Yiqiong Zhang Hanwen Liu Shuangyin Wang College of Materials Science and Engineering Changsha University of Science and TechnologyChangsha 410114China School of Chemical Engineering Xiangtan UniversityXiangtan 411105China State Key Laboratory of Chemo/Bio-Sensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China School of Science and Technology University of New EnglandArmidaleNSW 2351Australia WA School of Mines MineralsEnergy and Chemical Engineering(WASM-MECE)Curtin UniversityPerthWA 6102Australia

The electrochemical coupling of biomass oxidation and nitrogen conversion presents a potential strategy for high value-added chemicals and nitrogen ***,in this work,CuO/Co_(3)O_(4)with heterogeneous interface is successfully constructed as a bifunctional catalyst for the electrooxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid and the electroreduction of nitrate to ammonia(NH_(3)).The open-circuit potential spontaneous experiment shows that more 5-hydroxymethylfurfural molecules are adsorbed in the Helmholtz layer of the CuO/Co_(3)O_(4)composite,which certifies that the CuO/Co_(3)O_(4)heterostructure is conducive to the kinetic adsorption of *** situ electrochemical impedance spectroscopy further shows that CuO/Co_(3)O_(4)has faster reaction kinetics and lower reaction potential in oxygen evolution reaction and 5-hydroxymethylfurfural electrocatalytic ***,CuO/Co_(3)O_(4)also has a good reduction effect on NO_(3)^(-).The ex-situ Raman spectroscopy shows that under the reduction potential,the metal oxide is reduced,and the generated Cu_(2)O can be used as a new active site for the reaction to promote the electrocatalytic conversion of NO_(3)^(-)to NH_(3) *** work provides valuable guidance for the synthesis of value-added chemicals by 5-hydroxymethylfurfural electrocatalytic oxidation coupled with NO_(3)^(-)while efficiently producing NH_(3).

关键词： 5-hydroxymethylfurfural oxidation ammonia production bifunctional catalyst CuO/Co_(3)O_(4) electrocatalyst

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High-entropy layered oxides nanosheets for highly efficient photoelectrocatalytic reduction of CO_(2)and application research

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Nano Research 2023年第4期16卷 4775-4785页

作者： Xuefei Liu Xiaoyan Wang Beibei Yang Junzheng Zhang Jun Lu State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China

High-entropy oxides receive significant attention owing to their“four effects”.However,they still suffer from harsh construction conditions such as high temperature and high pressure and present a block-like ***,in this work,Ni-Mn-Cu-Co-Fe-Al high-entropy layered oxides(HELOs)with a layered nanosheet structure were constructed by a simple pathway of topological transformation under relatively low temperature(300℃)with six-membered Ni-Mn-Cu-Co-Fe-Al layered double hydroxides(LDHs)precursors,which exhibited an outstanding activity and excellent selectivity for CO_(2)photoelectroreduction(obtaining the highest carbon monoxide yield of 909.55μmol·g^(−1)·h^(−1)under−0.8 V *** hydrogen electrode(RHE),which is almost twice that of pure electrocatalysis).In addition,the charging voltage of a photo-assisted Zn-CO_(2)battery with HELOs as electrode was reduced from 2.62 to 2.40 V;the discharging voltage of the battery was increased from 0.51 to 0.59 V with the assistance of *** improvement of round-trip efficiency of the battery indicates that light played a positive role in both the charging and discharging *** study not only lays an important foundation for the development of high-entropy oxides but also expands their application in the field of photoelectrochemistry.

关键词： high-entropy layered oxides(HELOs) CO_(2)reduction layered double hydroxides(LDHs) photoelectrocatalytic

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Spin chiral anisotropy of diamagnetic chiral mesostructured In_(2)O_(3) films

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Nano Research 2024年第8期17卷 7756-7761页

作者： Ting Ji Quanzheng Deng Hao Chen Lu Han Zhibei Qu Shunai Che Yingying Duan Frontiers Science Center for Transformative Molecules State Key Laboratory of Metal Matrix CompositesShanghai Key Laboratory for Molecular Engineering of Chiral DrugsSchool of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Chemical Science and Engineering Tongji UniversityShanghai 200092China Department of Medicinal Chemistry School of PharmacyFudan UniversityShanghai 201203China

Spin chiral anisotropy(SChA)refers to the occurrence of different spin polarization in antipodal chiral ***,we report the SChA in diamagnetic chiral mesostructured In2O3 films(CMIFs)with manifestation of chirality-dependent magnetic circular dichroism(MCD)*** were grown on fluorine-doped tin dioxide conductive glass(FTO)substrates,which were synthesized via a hydrothermal route,with malic acid used as the symmetry-breaking *** levels of chirality have been identified in CMIFs:primary nanoflakes with atomically twisted crystal lattices and secondary helical stacking of the *** exhibit chirality-dependent asymmetric MCD signals due to the different interactions of chirality-induced effective magnetic field and external magnetic field,which distinguish from the commonly observed external magnetic fielddependent symmetric MCD *** findings provide insights into spin manipulation of spin-paired diamagnets.

关键词： chiral inorganics mesostructure diamagnet spin chiral anisotropy(SChA) magnetic circular dichroism(MCD)

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