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A bifunctional wood membrane modified by MoS_(2)/covalent organic framework heterojunctions for effective solar-driven water evaporation and contaminant degradation

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Science China Chemistry 2024年第6期67卷 2111-2120页

作者： Ziwei Cui Jianfei Wu Haoran Li Yaning Xu Tiantian Wu Lixing Kang Qing Huang yahui cai Jianzhang Li Dan Tian Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing210037China Key Laboratory of Multifunctional Nanomaterials and Smart Systems Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou215123China State Key Laboratory of Efficient Production of Forest Resources Beijing Forestry UniversityBeijing100083China

Interfacial solar evaporation technology is considered one of the most promising strategies for alleviating the scarcity of freshwater resources.However,solar-driven evaporation technology cannot eliminate the pollutants in the residual wastewater.To solve this problem,we have prepared a two-in-one solar-driven evaporation/photocatalysis system by decorating MoS_(2)/covalent organic framework(COF)heterojunctions on wood(MoS_(2)/COF-wood).Thanks to the unique porous structure of wood,it provides a strong guarantee for water transport and vapor release during the evaporation process.The introduction of MoS_(2) and COFs can promote the breaking of hydrogen bonds between water molecules,which leads to a significant decrease in the enthalpy of evaporation,achieving a water evaporation rate as high as 2.17 kg m^(-2)h^(-1)under 1 sun irradiation.Meanwhile,the resulting MoS_(2)/COF-wood exhibits good salt resistance and reusability.In addition,the heterojunctions formed between COFs and MoS_(2) can effectively inhibit charge carrier complexation and improve the photocatalytic degradation ability of pollutants(over 99%).This study highlights the construction strategy of bifunctional wood-based materials for freshwater production and wastewater remediation.

关键词： covalent organic framework MoS_(2) wood photocatalysis solar-driven evaporation

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A bifunctional wood membrane modified by MoS/covalent organic framework heterojunctions for effective solar-driven water evaporation and contaminant degradation

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Science China Chemistry 2024年

作者： Ziwei Cui Jianfei Wu Haoran Li Yaning Xu Tiantian Wu Lixing Kang Qing Huang yahui cai Jianzhang Li Dan Tian State Key Laboratory of Efficient Production of Forest Resources Beijing Forestry University Key Laboratory of Multifunctional Nanomaterials and Smart Systems Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of Sciences Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry University

Interfacial solar evaporation technology is considered one of the most promising strategies for alleviating the scarcity of freshwater resources. However, solar-driven evaporation technology cannot eliminate the pollutants in the residual wastewater.To solve this problem, we have prepared a two-in-one solar-driven evaporation/photocatalysis system by decorating MoS2/covalent organic framework (COF) heterojunctions on wood (MoS2/COF-wood). Thanks to the unique porous structure of wood, it provides a strong guarantee for water transport and vapor release during the evaporation process. The introduction of MoS2and COFs can promote the breaking of hydrogen bonds between water molecules, which leads to a significant decrease in the enthalpy of evaporation, achieving a water evaporation rate as high as 2.17 kg m-2h-1under 1 sun irradiation. Meanwhile,the resulting MoS2/COF-wood exhibits good salt resistance and reusability. In addition, the heterojunctions formed between COFs and MoS2can effectively inhibit charge carrier complexation and improve the photocatalytic degradation ability of pollutants (over 99%). This study highlights the construction strategy of bifunctional wood-based materials for freshwater production and wastewater remediation.

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Synergetic bimetallic catalysts:A remarkable platform for efficient conversion of CO_(2) to high value-added chemicals

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Journal of Energy Chemistry 2023年第12期87卷 162-191,I0006页

作者： Jundie Hu Fengyi Yang Jiafu Qu yahui cai Xiaogang Yang Chang Ming Li School of Materials Science and Engineering Suzhou University of Science and TechnologySuzhou 215009JiangsuChina College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123JiangsuChina College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037JiangsuChina

Carbon dioxide reduction reaction(CO_(2)RR) represents an efficient approach to achieving carbon neutrality and simultaneously generating clean energy.However,the strong stability of CO_(2) molecules and the diversity of products pose significant challenges.As an emerging material,bimetallic catalysts have been widely reported for their unique advantages,such as tunable electronic structures,suitable adsorption/desorption of CO_(2) and intermediates,and optimizable d-band centers of active sites through bimetallic synergy.These catalysts provide a remarkable platform for converting CO_(2) into high value-added chemicals.This review comprehensively summarizes recent research advances in bimetallic catalysts for CO_(2)RR.Firstly,the challenges associated with CO_(2)RR,including activity and selectivity are analyzed,followed by a discussion on the unique advantages of bimetallic catalysts.Next,their synthesis strategies are categorized into dual-atom site catalysts(DACs),bimetallic nanoparticles and nanoclusters,binary metal semiconductors,and layered double hydroxides(LDHs).Additionally,advanced characterization techniques of bimetallic catalysts and their applications in CO_(2)RR are thoroughly introduced.Finally,the prospects and challenges for the application of bimetallic materials are highlighted.This review aims to provide inspiration for CO_(2)RR into high-value chemicals and shed light on the research of bimetallic materials.

关键词： Catalysis Carbon dioxide Bimetallic Dual-atom site catalysts Synergy

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Flexible,durable,and anti-fouling nanocellulose-based membrane functionalized by block copolymer with ultra-high flux and efficiency for oil-in-water emulsions separation

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Nano Research 2023年第4期16卷 5665-5675页

作者： Jianfei Wu Yuxuan Su Ziwei Cui Yang Yu Jiafu Qu Jundie Hu yahui cai Jianzhang Li Dan Tian Qichun Zhang Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China School of Materials Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China Department of Materials Science and Engineering&Center of Super-Diamond and Advanced Films(COSDAF) City University of Hong KongHong Kong 999077China

The clearwater obtained from stabilized oily wastewater has become a worldwide challenge.Nowdays,the area of oil/water emulsion separation materials have accomplished great progress,but still faces the enormous problems of low flux,poor stability,and pollution resistance.Nanocelluloses(cellulose nanocrystals(CNC))with the advantages of hydrophilicity,ecofriendliness,and regeneration are ideal materials for the construction of separation membranes.In this paper,a flexible,antifouling,and durable nanocellulose-based membrane functionalized by block copolymer(poly(N-isopropylacrylamide)-b-poly(N,Ndimethylaminoethyl methacrylate))is prepared via chemical modification and self-assembly,showing high separation efficiency(above 99.6%)for stabilized oil-in-water emulsions,excellent anti-fouling and cycling stability,high-temperature resistance,and acid and alkali resistance.More importantly,the composite membrane has ultra-high flux in separating oil-in-water emulsions(29,003 L·m^(−2)·h^(−1)·bar^(−1))and oil/water mixture(51,444 L·m^(−2)·h^(−1)·bar^(−1)),which ensures high separation efficiency.With its durability,easy scale-up,and green regeneration,we envision this biomass-derived membrane will be an alternative to the existing commercial filter membrane in environmental remediation.

关键词： nanocellulose-based membrane oil/water emulsions separation ultra-high flux good durability anti-fouling property

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探索细菌杂交实验在高中生物学教学中的应用

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生物学教学 2024年第5期49卷 57-60页

作者：谢晓石蔡亚慧刘满希江苏省扬州中学扬州225001 江苏省邗江中学扬州225126 江苏省扬州市教育科学研究院扬州225100

利用细菌杂交技术,设计并实施筛选耐药性细菌实验,这种简便易行的高中遗传学实验,可以帮助学生深入了解遗传学的相关知识,认识到细菌耐药性的危害,增强社会责任感,提高生物学学科核心素养。

关键词：细菌杂交实验设计生物学教学

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电化学沉积法制备ZnO厚膜工艺研究

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人工晶体学报 2024年第6期53卷 1069-1077页

作者：李岗归黄丹阳赵小龙蔡亚辉贺永宁西安交通大学微电子学院西安710049 西安交通大学微纳电子与系统集成重点实验室西安710049

X射线具有较高的光子能量,这使得其在ZnO材料中具有大的穿透深度,因此为了更有效地探测X射线,需要制备出微米甚至百微米厚度的ZnO膜。本文采用电化学沉积法快速制备14.85μm厚的ZnO膜。实验结果表明,沉积电势和电极材料会显著影响ZnO膜... 详细信息

X射线具有较高的光子能量,这使得其在ZnO材料中具有大的穿透深度,因此为了更有效地探测X射线,需要制备出微米甚至百微米厚度的ZnO膜。本文采用电化学沉积法快速制备14.85μm厚的ZnO膜。实验结果表明,沉积电势和电极材料会显著影响ZnO膜的沉积速率与表面形貌。随着沉积电势的升高,ZnO形貌由六角柱状结构变为片状结构,当电势过大时会有大量氢气生成,导致薄膜孔洞增加而无法成膜。使用金属Pt为阳极电极时,溶液会逐渐酸化,导致ZnO在沉积的同时也会溶解,当二者速率相一致时,ZnO膜厚便不再增加,因此不适合生长ZnO厚膜。而使用金属Zn为阳极电极时,溶液的pH值基本保持不变,更适合生长ZnO厚膜。使用金属Zn作为阳极电极,沉积电势为0.65 V,电解液浓度为0.4 mol/L时,实现了1 h生长14.85μm的ZnO厚膜。在5 V偏压下,基于ZnO厚膜的探测器对加速电压为40 kV的X射线的响应度可达66.8μC·Gy^(-1)·cm^(-2)。

关键词： ZnO厚膜电化学沉积法 X射线探测器沉积电势 Zn电极沉积速率

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基于高速冲击异质惯性场的金属各向异性动态力学属性虚场表征法

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航空学报 2024年第10期45卷 187-204页

作者：付佳伟杨泽斐蔡亚辉聂祥樊齐乐华西北工业大学深圳研究院深圳518063 西北工业大学机电学院西安710072 空军工程大学航空等离子体动力学国家级实验室西安710038

2024变形铝合金等轻质高强金属板材作为重要结构材料广泛应用于航空航天工业领域,其轧制生产过程引起的塑性各向异性和冲击载荷下表现出的应变率相关性显著影响着板材的变形行为,加大结构部件精确成形和极端工况服役行为准确预测的难度... 详细信息

2024变形铝合金等轻质高强金属板材作为重要结构材料广泛应用于航空航天工业领域,其轧制生产过程引起的塑性各向异性和冲击载荷下表现出的应变率相关性显著影响着板材的变形行为,加大结构部件精确成形和极端工况服役行为准确预测的难度。当前,材料动态力学属性表征主要依赖于经典霍普金森压力杆法,该方法基于均匀变形和一维应力波假设前提,对于宽应变率范围各向异性动态力学属性,存在试验数量大、耦合效应表征难、部分参数难提取等缺点。针对此,提出一种基于高速冲击异形件诱导异质惯性场的金属各向异性-率相关塑性参数虚场同步表征新方法。通过设计开展双缺口异形试件高速冲击虚拟试验,实现试件非均匀应力应变状态调控,获取其惯性加速阶段的异质状态应变场、应变率场及加速度场;基于虚功原理构建动态本构参数识别算法,分析不同边界条件、冲击加载模式等状态条件变量对参数表征精度的影响规律,从单次冲击异质惯性场数据中实现试件动态各向异性-率相关塑性属性多参数一次准确表征,最大程度减少试验数量,简化测试过程,突破常规动态测试方法所受条件限制。

关键词：动态力学属性表征虚场法塑性各向异性率相关效应惯性冲击试验

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Thermo-controlled,self-released smart wood tailored by nanotechnology for fast clean-up of highly viscous liquids

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SmartMat 2023年第1期4卷 153-167页

作者： yahui cai Jianfei Wu Kaili Wang Youming Dong Jundie Hu Jiafu Qu Dan Tian Jianzhang Li Qiliang Fu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjingChina School of Materials Science and Engineering Suzhou University of Science and TechnologySuzhouChina Scion RororuaNew Zealand

Designing highly porous materials is of great importance for liquid separation,water purification,and disinfection,such as spill oil cleaning and recycling,seawater desalting,and oil/water separation.However,a remaining challenge is to produce porous materials with the characteristics of fast absorption,continuous directional transport,and self-release of viscous liquid.Herein,a functional cellulosic composite is reported by the chemical treatment and functionalization of wood resulting in a smart wood that can thermally selfrelease and separate high viscosity oil.The smart wood has a high absorption speed of 1398 mL/(m_(2)·s)(ethylene glycol)and a maximum absorption capacity of 47.2 g/g(chloroform)due to its intrinsic vertical micro/nanoscale channel structure,low tortuosity,and high porosity.Moreover,the switchable wettability is achieved by the surface coating of poly(N-isopropylacrylamide)on the porous wood,which enables the collection and removal of oil from the oil/water mixture.The high viscosity oil can be automatically released due to the passive oil release at room temperature.The release capacity of the smart wood remains above 91%after 15 cyclic tests.We envision that this functional smart wood could be extended to a wide range of applications in smart hydrogels,microfluidics,artificial drug release,and environmental restoration.

关键词： fast clean-up nanomaterial self-release smart wood thermal responsive

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Selective separation of oil-in-water emulsion with high efficiency by bio-inspired Janus membrane

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Science China(Technological Sciences) 2021年第10期64卷 2211-2219页

作者： cai yahui CHEN DongYun LI NaJun XU QingFeng LI Hua HE JingHui LU JianMei College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China

The efficient and rapid separation of oil from stabilized oil-in-water emulsions with micro/nanometer size is a global challenge.Owing to the low oil content in oil-in-water emulsions,separating the oil by simply controlling the surface wettability is difficult.Controlling the pore size of the membrane surface to achieve separation will lead to a sharp decrease in flux.Herein,inspired by cell membrane transportation,a hydrophilic/hydrophobic bifunctional Janus membrane for stable oil-in-water separation was prepared by simple surface polymerization and vapor diffusion.The prepared Janus membrane contained a hydrophobic side and hydrophilic polyamine layer.When used for oil-in-water emulsion separation,the polyamine layer accumulated micro/nanometer oil droplets,forming an oil layer on the hydrophobic surface.Water was retained by the 1H,1H,2H,2H-perfluorooctyl trichlorosilane layer,allowing oil droplets to selectively permeate through the membrane,achieving the separation effect.As the pore size of the modified fabric was basically unchanged,the permeation flux was fast(1.53×10^(3) Lm^(−2) h^(−1)).Furthermore,the poly(N,N-dimethylaminoethyl methacrylate)layer destroyed the emulsion stability,making the emulsion droplets aggregate without affecting the separation efficiency with fast permeation flux.Therefore,the prepared bifunctional Janus membrane shows great potential for actual wastewater treatment.

关键词： bifunctional Janus membrane demulsification function oil-in-water emulsion separation superhydrophobicity/superoleophilicity surface chemistry

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电子束辐照诱导介质表面带电演化过程

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科学通报 2022年第2期67卷 212-220页

作者：王丹蔡亚辉茅张松贺永宁西安交通大学微电子学院西安710049 西安交通大学信息与通信工程学院西安710049 西安市微纳电子与系统集成重点实验室西安710049

空间环境中航天器介质表面的充放电现象是在轨航天器工作中面临的重要可靠性问题,开展介质表面充放电动态过程研究对于揭示带电机理、开展带电防护研究至关重要.本文推导了介质表面电子发射行为对表面带电类型和带电水平的影响规律,通... 详细信息

空间环境中航天器介质表面的充放电现象是在轨航天器工作中面临的重要可靠性问题,开展介质表面充放电动态过程研究对于揭示带电机理、开展带电防护研究至关重要.本文推导了介质表面电子发射行为对表面带电类型和带电水平的影响规律,通过仿真建模模拟了恒定能量电子束辐照介质时的表面电荷积累过程,获得了氧化镁、氧化铝、高阻氧化锌3种介质表面电位演化过程的动态规律.结果表明,如果电子束能量低于二次电子产额曲线中第二临界能量,则辐照诱发的表面负带电或正带电的平衡电位较低,仅为几十伏;而高于第二临界能量的电子束辐照诱发的表面负带电水平可达上万伏;具有高第二临界能量的介质材料的负带电水平相对较低且充电速率较为缓慢,是减缓介质表面充电过程、实现带电防护的理想材料.本研究详尽论述了单一能量电子束辐照下介质表面电位演化过程的动态规律,对于进一步开展介质表面带电水平分析和抑制带电研究具有重要意义.

关键词：介质带电表面电位平衡电位二次电子发射电子束辐照

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