共价三嗪骨架分离膜的制备及有机溶剂渗透行为研究

共价三嗪骨架(Covalent Triazine Frameworks,CTFs)材料是一类以共价键连接的多孔准晶型聚合物,在吸附、催化、气体储存和高纯分离领域具有潜在的应用价值.在本项研究中,以4,4′-联苯二甲腈为单体,采用溶胶-凝胶法制备CTF分离膜.经红外光谱(FTIR)和固体核磁(ssNMR)表征证实,所制备的膜具有CTFs材料的特征三嗪环结构.在此基础上,开展了不同有机溶剂通过CTF分离膜的渗透行为研究,考察了溶剂的渗透汽化性能,以及溶剂对分离膜溶胀的作用规律.结果显示,CTF分离膜对于直链醇类的渗透率随醇类碳数的增加而上升;而对于同分异构低碳醇的渗透率,则随支链增加而降低.同时,正辛醇-水分配系数越大的组分,其渗透率往往越大.CTF分离膜对于有机溶剂分子的渗透规律预示了它在有机溶剂分离领域的应用前景.     

光催化还原杂环化共价有机框架构筑富电子吸附剂实现碘的理想吸附（英文）

碘的理想吸附剂通常需要具有两个特征,即高的吸附容量和快的吸附速率,但是这项课题仍然富有挑战性.本文通过构筑杂环化共价有机框架,阐述了一种有效构筑理想碘吸附剂的方法.这种杂环化基于一种后修饰的方式,采用了一种原位光催化双键与邻氨基苯甲酰胺成环的技术.基于该方法得到的材料ECUT-COF-13具有高的碘吸附容量(10.81 g g^-1,高于所有报道的碘吸附材料)和吸附速率(1.4 g h^-1,高于所有报导的二维共价有机框架材料).该材料优异的碘吸附性能是基于一种富电子机理,这种富电子状态主要来源于光催化还原杂环化共价有机框架(同时提高了网格的共轭性和氮含量).该研究成果不仅提供了一种构筑功能共价有机框架的新路径,同时提供了一种构筑富电子共价有机框架结构的通用策略.     

MoS_2/石墨烯/泡沫炭复合材料的析氢性能（英文）

以包覆石墨烯的炭化三聚氰胺泡沫作为支撑,通过水热法在三维泡沫炭上原位生长二硫化钼(MoS_2)纳米片,合成出一系列的MoS_2/石墨烯/泡沫炭复合材料。经XRD和TEM表征,拥有三维网络结构的炭基骨架被厚度为15～20 nm的MoS_2纳米片均匀包裹。石墨烯包覆量对析氢性能影响很大,包覆浓度25 mg L~(-1)的R-CMMS-25析氢性能最佳,在10 m A cm~(-2)电流密度下过电位为163 m V,相应的塔菲尔斜率为76 m V dec-1,相比之前未包覆石墨烯的复合材料,析氢性能得到了很大提升。通过阻抗谱间接表征材料的电子迁移效率,可以看出RCMMS-25的阻抗值最低,这表明包覆适量还原氧化石墨烯能够加速电子迁移效率并进一步提升析氢性能。     

硫掺杂氮化碳纳米片棒状聚集体用于光催化析氢（英文）

合成具有较宽吸收光谱的少层氮化碳是一个具有吸引力的课题.杂原子掺杂(特别是硫掺杂)可以有效地避免纳米级片层氮化碳中由于量子限制效应所引起的带隙加宽.与二次煅烧硫化不同的是,预硫化超分子前驱体可以原位地形成硫掺杂氮化碳纳米片堆叠聚集体(SCN).这种少层的框架结构呈现出了更大的比表面积(139.06 m² g^-1),暴露了更多的活性位点.此外,硫的引入使原七嗪环的共轭结构发生扭曲,从而通过激活价带电子的n→n^*跃迁而缩小带隙.在模拟日光条件下,SCN_0.8(3925.8μmol g^-1h^-1)的析氢速率是块体氮化碳(BCN,485.2μmol g^-1 h^-1)的8.1倍.本工作旨在最大限度地利用杂原子掺杂和形态调控的协同效应来提高光催化活性,且为光催化剂的多维同步优化提供了新的视角.     

氢燃料电池能源峰会即将召开（英文）

正March 4-5, Lisbon, Portugal The two-day event will bring together key industry stakeholders from all facets of the hydrogen industry to discuss the required economical and infrastructural innovations for a sustainable future energy carrier. The key discussions will involve monetization, latest technology implementations, material optimization, production and     

铋掺杂提高氧化铈中氧空位浓度增强CO_2光催化还原性能（英文）

氧空位在CO_2光催化还原过程中往往发挥重要作用。本工作中,用水热法合成了不同Bi掺杂量的二氧化铈光催化剂Ce_(1-x)Bi_xO_(2-δ),其中Ce_(0.6)Bi_(0.4)O_(2–δ)在Xe灯照射下表现出最高的光催化活性,其CO产率为纯二氧化铈纳米棒的4.6倍。X射线衍射(XRD)分析表明固溶体保留了二氧化铈的萤石结构;紫外–可见漫反射(UV-Vis)光谱表明固溶体可见光吸收增强;X射线光电子能谱(XPS)和拉曼光谱(Raman)分析表明,掺杂后氧空位浓度明显提高。结合原位傅里叶变换红外光谱(in-situFT-IR),发现引入Bi提高了固溶体中氧空位的浓度,并改变了CO_2在催化剂表面上的吸附/活化行为,光照下碳酸氢根、碳酸根、甲酸等中间产物明显增多,从而增强了CO_2光催化还原性能。     

用于可充电金属离子电池的共价有机框架电极材料综述（英文）

共价有机框架具有强健的骨架、丰富的电化学活性位点、便于金属离子传输的可控孔道以及利于优化电化学性能的可调控的分子结构,因此是理想的下一代可充电金属离子电池电极材料。此外,共价有机框架电极材料没有传统无机电极材料价格昂贵及含有毒金属的问题,也不存在有机小分子循环稳定性差的问题,在下一代可充电金属离子电池中具有巨大的应用潜力。因此,本文总结了共价有机框架电极材料的电化学活性位点,并着重讨论了通过调节共价有机框架的骨架结构、孔道、活性位点和电子结构提高共价有机框架电极材料电化学性能(包括:能量密度、倍率性能和循环寿命)的策略。为了开发高性能的共价有机框架电极材料,未来的工作需着重于优化它们的离子和电子导电性,进一步提高它们的工作电压以及探明它们的储能机制。本文将有助于开发用于下一代金属离子电池的高性能共价有机框架电极材料。     

超临界正丙醇回收炭纤维增强环氧树脂复合材料（英文）

研究了降解温度、反应时间和添加剂对超临界正丙醇中炭纤维增强环氧树脂基复合材料回收的影响。利用扫描电镜、热重、X射线光电子能谱、接触角和单丝拉伸对回收炭纤维进行表征。结果表明,随温度的升高,复合材料降解速率加快,但回收炭纤维力学性能略微降低。随反应时间的延长,复合材料降解速率降低,回收炭纤维力学性能降低。1%质量含量的KOH能明显提高复合材料的回收效率。伴随KOH含量增加,复合材料降解速率没有明显提高,而使回收炭纤维力学性能变差。合适的反应条件对回收具有清洁表面、良好热稳定性和力学性能完好保留的炭纤维至关重要。回收炭纤维表面化学的微弱变化使回收炭纤维同环氧树脂的接触角略增加。超临界正丙醇是一种回收炭纤维复合材料的有效方法。     

热点新闻（英文）

<正>Tian Shihong Attends 102~(th) ISO Council MeetingOn behalf of SAC,permanent member of ISO,SAC Administrator Tian Shihong attended the 102~(th) ISO Council meeting in Geneva,Switzerland from December 13 to 14,2016,which centered on the election of next ISO Secretary-General.     

热点新闻（英文）

正Enhanced cooperation with Belt and Road countries The Chinese delegation led by Tian Shihong, SAMR Vice-Minister and SAC Administrator, visited Vietnam, Cambodia and Laos on November 10-19, 2019 to enhance cooperation in such fields as standardization, metrology and conformity assessment for serving the Belt and Road Initiative. In Vietnam, Tian held talks with Pham Cong Tac, Deputy Minister of Science and Technology, Vietnam, and made     

热点新闻（英文）

正2016 Sino-German City-to-City Standardization Cooperation Seminar2016 Sino-German City-to-City Standardization Cooperation Seminar was held in Chengdu,China Southwest city of Sichuan province to enhance the standardization cooperation and share relevant experience between the two nations.Presided over by SAC Vice-Administrator Guo Hui,the meeting was attended by ISO President Zhang Xiaogang,SAC     

热点新闻（英文）

正Tian Shihong attends GS1 General Assembly 2018 The GS1 General Assembly 2018 was held from May 14 to 17 in Hangzhou,welcoming nearly 300 representatives from the member organizations and enterprises in over 80 countries and regions.     

多巴胺对多壁碳纳米管侧壁的生物功能化及其聚(酰胺-酰亚胺)基复合材料的制备（英文）

采用微波辐射法,以多巴胺(Dop)为改性剂,多壁碳纳米(MWCNTs)管与多巴胺间形成共价键合的功能化。通过FT-IR、XRD、TGA、SEM和TEM对多巴胺功能化的MWCNT-Dop进行表征。MWCNTs得到高度功能化,可作为一种MWCNTs酚基化的有效方法。采用溶液共混工艺制备出MWCNT-Dop增强的聚(酰胺-酰亚胺)基复合材料。通过高能超声,MWCNT-Dop(0~15 wt%)分散于聚合物基体中。TGA结果表明,该复合材料具有良好的热稳定性。拉伸力学测试表明,随着MWCNT-Dop含量的增加,该复合材料的弹性模量增加。     

热点新闻（英文）

<正>ISO Vice President Applauds China's Active Role SAC Administrator Tian Shihong held a teleconference with Bronwyn Evans,ISO Vice-President(finance)in February.The two sides held extensive and thorough communication with broad consensus reached on key strategic issues including ISO development goal and work initiatives in 2017,ISO governance,sustainable ISO business model and financial policies,etc.     

政策（英文）

<正>THE PLAN FOR ESTABLISHING THE NATIONAL STANDARDIZATION SYSTEM(2016-2020)the State Council The reform shall be deepened and the standardization strategy will be implemented according to the plan.By 2020,the national standardization system shall be basically established to support national governance with effective,advanced and adaptable standards,greatly improving the influence of Chinese standards in the global arena.     

热点新闻（英文）

<正>Continued Cooperation through Communication and Exchange with CEN/CENELEC SAC Administrator Tian Shihong met the visiting delegation led by Vincent Laflèche,CEN President and Elena Santiago Cid,CEN and CENELEC Director General.The two sides briefed on their own standardization progress,held in-depth exchanges on the fields of common interests such     

热点新闻（英文）

<正>78th IEC General Meeting Held in TokyoThemed asintegration for a smarter world,the 78th General Meeting of the IEC(International Electrotechnical Commission)was held from November 10 to 14 in Tokyo,Japan.More than 2,200 global technology leaders and experts were coming together for this week-long meeting to focus on practical solutions to make the world safer and more sustainable.According to the agenda,industry leaders and experts presented concrete examples     

热点新闻（英文）

<正>Tian Shihong Meets the BMWi Delegation SAC Administrator Tian Shihong met Dr.Janssen,Deputy-Director of Innovation and IT Technology Department of German Federal Ministry for Economic Affairs and Energy(BMWi)and German Chairman of Sino-German Cooperation Committee for Standardization in Beijing on February 6,2015.The two sides exchanged opinions on how to fulfill the consensus on e-mobility reached by leaders of both countries and to further strengthen the cooperation in the field.     

热点新闻（英文）

正Tian Shihong attends 42nd ISO General AssemblyThe Chinese delegation,headed by Tian Shihong,SAMR Vice-Minister and SAC Administrator,attended the 42nd SO General Assembly held in Cape Town,South Africa from September 16 to 20.This year's ISO GA focused on the impact of standards on economic,social and environmental development and     

热点新闻（英文）

正Enhanced standardization cooperation between China and FranceThe Third China-France Standardization Cooperation Seminar was held in Shenzhen, South China's Guangdong province from December 11 to December 13, 2018, which attracted over 100 experts from the standardization bodies,