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Radiation-Assisted Synthesis of Crown Ether-Modified Covalent Organic Frameworks for Lithium Isotope Separation

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CCS Chemistry 2024年第10期6卷 2594-2606页

作者： Shouchao Zhong Yue Wang Jianhui Lan mingshu Xie Yiqian Wu Jiuqiang Li Fujian Liu Lilong Jiang Jing Peng Liyong Yuan Maolin Zhai Weiqun Shi Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science Key Laboratory of Polymer Chemistry and Physics of the Ministry of EducationCollege of Chemistry and Molecular EngineeringBeijing National Laboratory for Molecular SciencesPeking UniversityBeijing 100871 National Engineering Research Center of Chemical Fertilizer Catalyst College of Chemical EngineeringFuzhou UniversityFuzhou350002 Fujian Laboratory of Nuclear Energy Chemistry Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049

γ-ray radiation-induced grafting strategy was first employed to immobilize 4-aminobenzo-15-crown-5 onto a covalent organic framework(COF).This endeavor culminated in the successful synthesis of a class of two-dimensional crown ether-modified COFs(named[15C5]n%-(TzDa-G-x%)),marking the maiden utilization of COFs in the realm of^(6)Li/^(7)Li isotope *** COFs exhibited swifter adsorption kinetics than alternative *** them,[15C5]_(57%)-(TzDa-G-50%)with its excellent crystallinity,porosity,and stability exhibited the best performance in Li+adsorption and^(6)Li/^(7)Li isotope *** Li+adsorption in acetonitrile achieved a capacity of 3.6 mg·g^(−1)within 30 min and a saturation capacity of 7.3 mg·g^(−1).The single-stage separation factor of^(6)Li/^(7)Li isotopes was 1.014±*** results of dynamic adsorption column experiments showed that the packed column made of[15C5]_(57%)-(TzDa-G-50%)maintained stable performance during four cycles of Li+adsorptionelution,with over 99%Li+removal rate in *** crown ether-modified COF has potential application in^(6)Li/^(7)Li isotope separation,and this radiation-assisted synthesis strategy is expected to become universal in the modification of COFs for diverse applications.

关键词： covalent organic framework gamma radiation modification crown ether ^(6)Li/^(7)Li isotope separation adsorption column

高职高专药学相关专业学生职业素质教育的思考与实践

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卫生职业教育 2009年第5期27卷 14-15页

作者：张明淑张健张立长春医学高等专科学校

高等职业教育是高等教育中独立的、无法替代的高等教育类型，其突出特点是注重学生职业能力的培养。如何培养学生职业素质、团队协作能力、实践能力、创造能力、就业能力和创业能力，并将学生职业素质教育落到实处，这是药学职业教育工... 详细信息

高等职业教育是高等教育中独立的、无法替代的高等教育类型，其突出特点是注重学生职业能力的培养。如何培养学生职业素质、团队协作能力、实践能力、创造能力、就业能力和创业能力，并将学生职业素质教育落到实处，这是药学职业教育工作者需要认真思考和实践的课题。

关键词：职业素质课程体系课程建设

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暴雨对块石回填土隧道稳定性的影响研究

地下空间与工程学报 2018年第S1期14卷 109-116页

作者：冯俭华徐坚张明书钟祖良覃亮中铁开发投资集团有限公司，云南昆明650118 重庆市轨道(集团)有限公司，重庆400045 重庆大学土木工程学院，重庆400045

为研究暴雨对块石回填土隧道稳定性的影响,以重庆市轨道交通10号线上湾路～环山公园区间内穿越块石回填土段隧道为研究对象,在对其围岩变形和支护结构开展现场监测试验的基础上,采用数值模拟方法对暴雨工况下该区段隧道围岩及支护结构... 详细信息

为研究暴雨对块石回填土隧道稳定性的影响,以重庆市轨道交通10号线上湾路～环山公园区间内穿越块石回填土段隧道为研究对象,在对其围岩变形和支护结构开展现场监测试验的基础上,采用数值模拟方法对暴雨工况下该区段隧道围岩及支护结构的力学行为变化情况进行分析研究,并与试验结果进行对比分析。结果表明:暴雨对围岩应力场和位移场的影响均主要体现在竖直方向上,其中应力最大增幅为16%,拱顶沉降增幅约50%,地表沉降增长接近1倍;暴雨发生后,只有拱脚部锚杆轴力有所增加,最大增幅约为24.32%,其余部位锚杆轴力均出现不同程度的减小;初期支护、仰拱和二衬的内力虽然在暴雨后均有不同幅度的增大,但其总体分布规律与降雨前大致相似。

关键词：块石回填土暴雨隧道围岩支护结构

一种用于卧式数控车床的专用加工手套箱及气氛自动控制方法

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制造技术与机床 2020年第11期 53-55页

作者：李继军张明树迟永刚中国工程物理研究院材料研究所四川绵阳621900

为了实现卧式数控车床加工区域密闭、提高密闭加工区域气体置换效率,提出一种用于卧式数控车床的专用加工手套箱及气氛自动控制方法。首先确定了专用加工手套箱功能结构,借助专用密封件和滑动附件,实现与卧式数控车床的密封和相对运动;... 详细信息

为了实现卧式数控车床加工区域密闭、提高密闭加工区域气体置换效率,提出一种用于卧式数控车床的专用加工手套箱及气氛自动控制方法。首先确定了专用加工手套箱功能结构,借助专用密封件和滑动附件,实现与卧式数控车床的密封和相对运动;然后通过气氛自动控制系统,借助设置于手套箱进气口和出气口的电气控制元件,实现加工手套箱内气体自动置换和气压自动保持,提高了专用加工手套箱内气氛控制效率。

关键词：卧式车床手套箱气氛控制

关怀伦理视角下的《孟子》“孺子入井”章诠释

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哲学研究 2024年第1期 77-86页

作者：李明书浙江大学哲学学院

《孟子》“子入井”一章的内容涉及孟子思想的核心观点,历来的诠释非常丰富。这一章以“四端”中的“侧隐之心”作为人之所以为人的基础,也是君王可以有效治理天下的充分且必要条件。传统注解多将四端解释为情感的表现,但当代引入西方... 详细信息

《孟子》“子入井”一章的内容涉及孟子思想的核心观点,历来的诠释非常丰富。这一章以“四端”中的“侧隐之心”作为人之所以为人的基础,也是君王可以有效治理天下的充分且必要条件。传统注解多将四端解释为情感的表现,但当代引入西方伦理学探讨儒家伦理之后,则产生了不同视角的诠释,如义务论、美德论、角色伦理学、示范伦理学、关怀伦理学等各种理论均曾以各自的视角解释这一章的意义,而其中只有关怀伦理学是以人的自然情感作为道德行为的根源,与侧隐之心的文本脉络以及历代注解最为接近。从中西比较哲学的发展脉络而言,关怀伦理学的视角可较为完整且融贯地诠释《孟子》“孺子入井”章。

关键词：《孟子》孺子入井侧隐之心关怀伦理

Diatomic Pd catalyst with conjugated backbone for synergistic electrochemical CO_(2)reduction

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Nano Research 2024年第6期17卷 4850-4855页

作者： Wenxuan zhang Mengran zhang Hongjuan Wang Wen zhang Min zhang MOE International Joint Laboratory of Materials Microstructure Institute for New Energy Materials and Low Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion School of Chemistry and Chemical EngineeringTianjin University of TechnologyTianjin 300384China

Double-site catalysts have attracted widespread attention in the field of electrocatalysis due to their high metal loading,adjustable active centres,and electronic valence ***,the development of bimetallic sites catalysts that coordinate with definite atoms is still in the exploratory ***,we designed and synthesized a bimetallic palladium complex(BPB-Pd_(2))with conjugated *** supported BPB-Pd_(2)was applied to electrochemical CO_(2)reduction reaction(CO_(2)RR)for the first *** as-obtained BPB-Pd_(2)gives an exceptional Faradaic efficiency of CO(FECO)of 94.4%at−0.80 V *** hydrogen electrode(RHE),which is significantly superior to monoatomic palladium catalyst(BPB-Pd1).The density functional theory(DFT)calculations revealed that the essential reason for the outstanding activity of BPB-Pd_(2)toward CO_(2)RR was that the electronic effect between diatomic palladium reduces the free energy change for CO_(2)RR ***,BPB-Pd_(2)exhibits moderate free energy change to form COOH*intermediate,which was beneficial for the generation of CO in CO_(2)RR.

关键词： synthesis electrocatalysis CO_(2)reduction bimetallic palladium complex synergistic catalysis

N-doped graphene quantum dot-decorated N-TiO2/P-doped porous hollow g-C_(3)N_(4) nanotube composite photocatalysts for antibiotic photodegradation and H2 production

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 165-178页

作者： Jingshu Yuan Yao zhang Xiaoyan zhang Junjie zhang Shen’gen zhang Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Xi’an Fanyi University Xi’an 710105China Shunde Graduate School of University of Science and Technology Beijing Foshan 528399China State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacao SAR 820000China

Exclusive responsiveness to ultraviolet light (~3.2 eV) and high photogenerated charge recombination rate are the two primary drawbacks of pure TiO_(2). We combined N-doped graphene quantum dots (N-GQDs), morphology regulation, and heterojunction construction strategies to synthesize N-GQD/N-doped TiO_(2)/P-doped porous hollow g-C_(3)N_(4) nanotube (PCN) composite photocatalysts (denoted as G-TPCN). The optimal sample (G-TPCN doped with 0.1wt% N-GQD, denoted as 0.1% G-TPCN) exhibits significantly enhanced photoabsorption, which is attributed to the change in bandgap caused by elemental doping (P and N), the improved light-harvesting resulting from the tube structure, and the upconversion effect of N-GQDs. In addition, the internal charge separation and transfer capability of0.1% G-TPCN are dramatically boosted, and its carrier concentration is 3.7, 2.3, and 1.9 times that of N-TiO_(2), PCN, and N-TiO_(2)/PCN(TPCN-1), respectively. This phenomenon is attributed to the formation of Z-scheme heterojunction between N-TiO_(2) and PCNs, the excellent electron conduction ability of N-GQDs, and the short transfer distance caused by the porous nanotube structure. Compared with those of N-TiO_(2), PCNs, and TPCN-1, the H2 production activity of 0.1%G-TPCN under visible light is enhanced by 12.4, 2.3, and 1.4times, respectively, and its ciprofloxacin (CIP) degradation rate is increased by 7.9, 5.7, and 2.9 times, respectively. The optimized performance benefits from excellent photoresponsiveness and improved carrier separation and migration efficiencies. Finally, the photocatalytic mechanism of 0.1% G-TPCN and five possible degradation pathways of CIP are proposed. This study clarifies the mechanism of multiple modification strategies to synergistically improve the photocatalytic performance of 0.1% G-TPCN and provides a potential strategy for rationally designing novel photocatalysts for environmental remediation and solar energy conversion.

关键词： N-doped TiO_(2) N-doped graphene quantum dots P-doped g-C_(3)N_(4) porous hollow nanotube heterojunction photocatalysis

Reversing free-electron transfer of sulfide cocatalyst for exceptional photocatalytic H_(2)evolution

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Journal of Materials Science & Technology 2024年第4期171卷 147-149页

作者： Yanfeng zhang Zhenyi zhang National Experimental Chemistry Teaching Center Hebei Key Laboratory of Inorganic Nano-materialsCollege of Chemistry and Materials ScienceHebei Normal UniversityShijiazhuang 050024China Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission Key Laboratory of Photosensitive Materials and Devices of Liaoning ProvinceSchool of Physics and Materials EngineeringDalian Minzu UniversityDalian 116600China

Recently,Yu and co-workers deeply explore the potential impact of free electron transfer between co-catalysts and photocatalyst carriers on H_(2)evolution efficiency of active sites over MoS_(2+x).They pro-pose an electron-reversal tactics to evade the unexpected electron transfer and synchronously regulate the above transfer in a beneficial orientation for weakening hydrogen adsorption on S ***,this highlight not only discusses and summarizes the essences of electron reversal and the optimized H ad-sorption/desorption mechanism,but also emphasizes the significance of femtosecond transient absorp-tion spectroscopy(fs-TAS)and in-situ irradiated X-ray photoelectron spectroscopy(ISI-XPS)for revealing charge transfer dynamics and *** anticipate that this highlight can disseminate a new per-spective on the roles of photocatalyst carriers in improving cocatalytic H_(2)-production kinetics.

关键词： Photocatalysis Cocatalyst Electron reversal Antibonding-orbital occupancy S–H bonds

Friction as energy dissipation process associated with superlubricity of solids

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Friction 2024年第9期12卷 2083-2088页

作者： Bo zhang Saga University Saga-shi 840-8502Japan

The paper shows that work in a quantum system is quantized with energy;the quantum work is equivalent to the highest eigenenergy(the Debye energy)of the system and the superlubricity of solids is derived from the quantum *** prerequisite for the superlubricity is that the lateral force at contact surfaces in sliding is less than the Debye force so that the phonon of the solids is not excited.

关键词： superlubricity phonon friction Plank law Debye frequency