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Precise gradient separation of nanoparticles using reduced graphene oxide-polyoxomolybdate membranes

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Science China Chemistry 2025年第1期68卷 209-216页

作者： Yixin Yang Wanlei Zhao Ruoxuan Zheng Hongqiang Li Wei Chen Yu-Fei Song State key laboratory of chemical Resource engineering Beijing University of Chemical TechnologyBeijing 100029China Quzhou Institute for Innovation in Resource chemical engineering Quzhou 324000China

The purification and size sieving of nanoparticles(NPs)represents a significant scientific ***,the rGO-polyoxometalates(POMs=PMo_(12),Mo_(132)and Mo_(368))membranes were fabricated successfully via a simple and scalable POMsassisted in-situ photoreduction *** the mass ratio of rGO to PMo_(12)was 1:30,the resultant rGO-PMo_(12)membranes with highly ordered and uniform nanochannels of 1.0 nm can be obtained,which showed an accurate carbon quantum dots(CQDs)separation with a cut-off size approximately 1.0 *** increase of the size of the interlayered POMs from PMo_(12)(1.0 nm),{Mo132}(2.9 nm)to{Mo_(368)}(3.8 nm),the resultant rGO-PMo_(12),rGO-Mo_(132)and rGO-Mo_(368)exhibited precise gradient separation of CQDs and Au nanoparticles by size exclusion *** results pave a promising way to construct new twodimensional(2D)membranes for highly efficient size-selective separation.

关键词： reduced graphene oxide polyoxometalates membranes gradient separation nanoparticles

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Synthesis of ordered mesoporous crystalline boron phosphate scaffold with double diamond surface structure

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Science China Chemistry 2025年第2期68卷 590-600页

作者： Chao Wang Wen-Duo Lu Jiao Wang Shunai Che An-Hui Lu Lu Han School of chemical Science and engineering Tongji UniversityShanghai 200092China State key laboratory of Fine chemicals Liaoning Key Laboratory for Catalytic Conversion of Carbon ResourcesSchool of Chemical EngineeringDalian University of TechnologyDalian 116024China School of Chemistry and chemical engineering Frontiers Science Center for Transformative MoleculesState Key Laboratory of Metal Matrix CompositesShanghai Key Laboratory for Molecular Engineering of Chiral DrugsShanghai Jiao Tong UniversityShanghai 200240China

Ordered mesoporous materials have received great attention due to their well-defined pore structures and potential applications in catalysis,adsorption,separation,drug delivery,*** various compositions of mesoporous solids have been successfully prepared,the preparation of crystalline non-metallic oxyacid salts with ordered mesoporosity remains a major ***,we report the synthesis of a mesoporous solid acid crystalline boron phosphate(BPO_(4))catalyst with a bicontinuous shifted double diamond(SDD)hyperbolic surface *** BPO_(4) scaffold was obtained by synergistic selfassembly in a mixed solvent of water and tetrahydrofuran using the diblock copolymer poly(ethylene oxide)-block-polystyrene as template and phosphoric acid and orthoboric acid as inorganic *** structure consists of two sets of diamond networks adjacent to each other with a mesostructural scale tetragonal symmetry(space group I4_(1)/amd)with unit cell parameters of a=80 nm and c=113 nm,which affords the scaffold a specific surface area of 44 m^(2)/*** a solid acid catalytic material,the SDD BPO_(4) scaffold exhibited excellent catalytic activity at room temperature with a conversion of furfural to 2-(dimethoxymethyl)furan over 70%and can be reused after recovery without serious loss of *** the propane oxidative dehydrogenation reaction,SDD BPO_(4) demonstrated high olefin productivity and selectivity while maintaining high reaction *** study provides ideas for the preparation of ordered mesoporous crystalline catalytic materials and demonstrates their potential for practical applications.

关键词： boron phosphate mesoporous material self-assembly block copolymer catalyst

Methyl Groups Pendant on Triphenylmethane Toward Modulating Thermal Stability and Dielectric Properties of the Crosslinkable Fluorinated Polyimide Films with High Transparency

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Chinese Journal of Polymer Science 2025年第2期43卷 316-327页

作者： Wen Yang Liang Yuan Kai Gong Ruo-Han Zhang Lan Lei Hui Li School of Chemistry and chemical engineering Shandong Key Laboratory of Fluorine Chemistry and Chemical Engineering MaterialsUniversity of JinanJinan250022China School of Materials Science and engineering Tianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin300350China

It is urgent to develop high-performance polyimide(PI)films that simultaneously exhibit high transparency,exceptional thermal stability,mechanical robustness,and low dielectric to fulfil the requirements of flexible display ***,a series of fluorinated polyimide films(FPIs)were fabricated by the condensation of 5,5′-(perfluoropropane-2,2-diyl)bis(isobenzofuran-1,3-dione)(6FDA)and the fluorinated triphenylmethane diamine monomer(EDA,MEDA and DMEDA)with heat-crosslinkable tetrafluorostyrene side groups,which was incorporated by different numbers of methyl groups pendant in the ortho position of amino ***,the FPI films underwent heating to produce crosslinking FPIs(C-FPIs)through the self-crosslinking of double bonds in the *** transparency,solvent resistance,thermal stability,mechanical robustness and dielectric properties of FPI and C-FPI films can be tuned by the number of methyl groups and crosslinking,which were deeply investigated by virtue of molecular dynamics(MD)simulations and density functional theory(DFT).As a result,all the films exhibited exceptional optically colorless and transparent,with transmittance in the visible region of 450-700 nm exceeding 79.9%,and the cut-off wavelengths(λ_(off))were nearly 350 *** thermal decomposition temperatures at 5% weight loss(T_(d5%))for all samples exceeded 504℃.These films exhibited a wide range of tunable tensile strength(46.5-75.1 MPa).Significantly,they showed exceptional dielectric properties with the dielectric constant of 2.3-2.5 at full frequency(10^(7)-20 Hz).This study not only highlights the relationship between the polymer molecular structure and properties,but offer insights for balancing optical transparency,heat resistance and low dielectric constant in PI films.

关键词： Crosslinkable fluorinated polyimide Methyl group Triphenylmethane Transparency Thermal stability Low dielectric constant

A review of over-discharge protection through prelithiation in working lithium-ion batteries

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Journal of Energy Chemistry 2025年第2期101卷 437-452页

作者： Hanchen Wang Yingtian Liu Mingze Jiang Qiang Zhang School of Aerospace engineering National Engineering Research Center of Neuromodulation Tsinghua University Tsinghua Center for Green chemical engineering Electrification Department of Chemical Engineering Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Tsinghua University

The demand for high safety and high reliability lithium-ion batteries(LIBs) is strongly considered for practical ***,due to their inherent self-discharge properties or abuse,LIBs face the threat of over-discharge,which induces premature end of life and increased risk of thermal *** addition,a strong demand for batteries with zero-volt storage is strongly considered for aerospace and implantable medical *** this review,we firstly introduce the necessity and the importance of over-discharge and zero-volt protection for *** mechanism of damage to the Cu current collectors and SEI induced by potential changes during over-discharge is *** current over-discharge protection strategies based on whether the zero-crossing potential of the electrodes is ***,the fresh insights into the material design of cathode prelithiation additives are presented from the perspective of over-discharge protection.

关键词： Electrode potential regulation Electrode prelithiation Li-ion batteries Over-discharge protection Zero-volt storage

The controlled oxidation states of the H4PMo11VO40 catalyst induced by plasma for the selective oxidation of methacrolein

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Chinese chemical Letters 2025年第2期36卷 189-194页

作者： Gang Hu Chun Wang Qinqin Wang Mingyuan Zhu Lihua Kang School of Chemistry and chemical engineering/State key laboratory Incubation Base for Green Processing of chemical engineering Shihezi University College of Chemistry&chemical engineering Yantai University

In this paper,low-temperature dielectric-blocked discharge plasma （DBD） was employed for the first time to treat silica-doped H4PMo11VO40（HPAV） catalysts (DBD（Ar/x）-MF-Catal) and apply them in the catalytic methacrolein （MAL） selective oxidation to produce methacrylic acid （MAA）.This work investigates in detail the controllable regulation of the concentration of oxidation states on silica-doped HPAV catalysts by adjusting the DBD discharge with controlled changes in voltage,current,treatment time,and treatment *** reports the intrinsic correlation between oxidation states and MAL oxidation *** research results indicated that the catalytic performance was related to the presence of oxygen vacancies and oxygen species (VO2+),and are the main reason for the selective oxidation of MAL to ***,the generation of oxygen vacancies and VO2+altered localized electrons,which resulted in the easier activation of *** calculations of DFT also proved the formation mechanism of oxygen vacancies and VO2+and electron properties on high-performance polymers,which elucidated the intrinsic influence of catalyst *** DBD（Ar/10）-MF-Catal catalysts with suitable VO2+and oxygen vacancy concentrations exhibited the highest catalytic performance with 90%MAL conversion and 70%MAA selectivity and showed good stability （500 h）.

关键词： Catalyst Dopant Methacrolein Methacrylic acid Oxygen vacancy Plasma

CO_(2)-mediated bicarbonate conversion to concentrated formate in a CEM-based electrolyzer

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Journal of Energy Chemistry 2025年第1期100卷 605-611页

作者： Haocheng Xiong Donghuan Wu Haonan Li Andrew Li Qikun Hu Siyao Song Bingjun Xu Qi Lu State key laboratory of chemical engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China College of Chemistry and Molecular engineering Peking UniversityBeijing 100871China Ordos laboratory Inner Mongolia 017000China

Renewable energy-driven bicarbonate conversion to valuable chemicals presents an attractive strategy for mitigating CO_(2)emissions,as bicarbonate can be efficiently generated from the capture of atmospheric CO_(2)using alkaline solutions with reactive *** this work,we present a CO_(2)-mediated bicarbonate conversion to pure formate using a cation exchange membrane-based electrolyzer with a 25 cm^(2)electrode *** electrolysis achieved selectivities exceeding 75%for formate at a total current of 2.5 A,achieving formate concentrations up to 1.2 M and yields as high as 95%over extended *** techno-economic assessment confirmed the economic viability of the process,highlighting the potential for bicarbonate electrolysis as a sustainable method for producing valuable chemicals.

关键词： Electrocatalysis Techno-economic assessments Electrochemistry Flow electrolyzer

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Bionic breathable open framework ionomer for medium-temperature fuel cells

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Science China Chemistry 2025年第2期68卷 407-408页

作者： Zidong Wei State key laboratory of Advanced chemical Power Sources School of Chemistry&Chemical EngineeringChongqing UniversityChongqing 400044China

Hydrogen,a green and sustainable energy source characterized by its abundance,zero emission,and high-volumetric energy density,is widely recognized as the fuel of the future and a crucial driver of the global energy *** exchange membrane fuel cells(PEMFCs),renowned for their high energy conversion efficiency,environmental compatibility,and low noise,have become pivotal in hydrogen energy applications[1,2].As the demand for clean energy increases across various application scenarios,expectations for fuel cells to achieve high output power density,simplified thermal management,and improved tolerance to impurity gases are growing.A promising solution is to increase the operating temperature to develop medium-temperature PEMFCs(MT PEMFCs),which bridges the gap between low-temperature fuel cells and high-temperature phosphoric acid fuel *** approach significantly enhances catalyst activity and theoretically improves electrochemical reaction kinetics[3].Elevated temperatures also reduce heat rejection,leading to simplified thermal management systems,and enhance the catalyst’s resistance to gas impurities such as carbon monoxide,thereby broadening the range of usable hydrogen sources[3].

关键词： transition simplified catalyst

Uncovering fantastic synergistic lithium adsorption with manganese-titanium based composite nanospheres:Mild synthesis and molecular dynamics simulation insights

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Journal of Energy Chemistry 2025年第2期101卷 52-67页

作者： Yameng Wang Zi-Yu Liu Yubei Su Yu Liu Aoqun Liu Xiaoye Zhang Yugang Huang Liyun Zhang Haisheng Chen Wancheng Zhu Department of chemical engineering Qufu Normal University Institute of engineering Thermophysics Chinese Academy of Sciences State key laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology

In light of the burgeoning energy technology sector and the ever-growing demand for lithium across diverse industrial domains,conventional lithium extraction methods have been proven inadequate due to their limited production capacity and high operational *** work introduces a novel approach to the manganese-titanium based composite HMTO（Mn:Ti=1:4） lithium ion-sieve（LIS） nanospheres,employing lithium acetate dihydrate,manganese carbonate and titanium dioxide P25 as the primary *** nanospheres exhibit relatively uniform spherical morphology,narrow size distribution,small average particle size（ca.55 nm）,large specific surface area(43.58 m2g-1) and high surface O2-content（59.01%）.When utilized as the adsorbents for Li+ions,the HMTO（Mn:Ti=1:4） LIS demonstrates a fast adsorption rate,approaching equilibrium within 6.0 h with an equilibrium adsorption capacity（qe）of 79.5 mg g-1and a maximum adsorption capacity（qm） of 87.26 mg g-1(initial concentration CO:1.8 g L-1).In addition,the HMTO（Mn:Ti=1:4） also delivers a high lithium extraction from the simulated high magnesium-lithium molar ratio salt lake brine（Mg:Li=103）,achieving a qeof 33.85 mg g-1along with a remarkable selectivity(αMgLi=2192.76).Particularly,the HMTO（Mn:Ti=1:4） LIS showcases a satisfactory recycling adsorption *** adsorption capacity remains at a high level,even that determined after the 5th cycle(55.45 mg g-1) surpasses that of the most recently reported ***,the fantastic synergistic lithium adsorption mechanism is deliberately uncovered by leveraging the ion exchange principles and molecular dynamics（MD） simulations.

关键词： Adsorption performance Ion exchange Lithium ion-sieves Manganese titanium composite Salt lake brine lithium extraction

Organic solvent nanofiltration membranes for separation in non-polar solvent system

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Green Energy & Environment 2025年第2期10卷 244-267页

作者： Shuyun Gu Siyao Li Zhi Xu State key laboratory of chemical engineering School of Chemical EngineeringEast China University of Science and Technology130 Meilong RoadShanghai200237China

Membrane technology holds significant potential for augmenting or partially substituting conventional separation techniques,such as heatdriven distillation,thereby reducing energy *** solvent nanofiltration represents an advanced membrane separation technology capable of discerning molecules within a molecular weight range of approximately 100-1000 Da in organic solvents,offering low energy requirements and minimal carbon *** separation in non-polar solvent system,such as toluene,n-hexane,and n-heptane,has gained paramount importance due to their extensive use in the pharmaceutical,biochemical,and petrochemical *** this review,we presented recent advancements in membrane materials,membrane fabrication techniques and their promising applications for separation in nonpolar solvent system,encompassing hydrocarbon separation,bioactive molecule purification and organic solvent ***,this review highlighted the challenges and opportunities associated with membrane scale-up strategies and the direct translation of this promising technology into industrial applications.

关键词： Organic solvent nanofiltration Membranes Membrane separation Non-polar solvent system Petrochemical and pharmaceutical application