检索结果-南通市图书馆

Magnetic KIT-6 nano-composite and its amino derivatives as convenient adsorbent for U(Ⅵ)sequestration

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2023年第12期17卷 2037-2049页

作者： Jiafeng Ouyang Wenlu Guo Lin Wang changming nie Dadong Shao Weiqun Shi Liyong Yuan School of Environmental and Biological Engineering Nanjing University of Science and TechnologyNanjing 210094China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China School of Chemistry and Chemical Engineering University of South ChinaHengyang 421001China

Although mesoporous silica with magnetically hybridized two-dimensional channel structures has been well studied in recent years,it remains a challenge to fabricate the counterpart with macroporous three-dimensional cubic structures since the highly acidic preparation conditions lead to dissolution of magnetic ***,we successfully prepared magnetic KIT-6 nano-composite and its amino derivatives by bearing acid-resistant iron *** prepared materials exhibited excellent properties for U(VI)ions removal from aqueous solutions under various *** experimental data show that the U(VI)adsorption features fast adsorption kinetics,high adsorption capacity and ideal selectivity toward U(VI).The adsorption process is of spontaneous and endothermic nature and ionic strength independence,and the adsorbents can be easily regenerated by acid *** to pristine KIT-6,the introduction of magnetism does not reduce the efficiency of the material to remove U(VI)while exerting its role as a recovery *** findings of this work further demonstrate the potential broad application prospects of magnetic hybrid mesoporous silica in radionuclide chelation.

关键词： magnetic nanoparticle 3D mesoporous silica amino functionalization adsorption of U(VI) acid resistance

同方期刊数据库

Theoretical studies on the complexation of Eu(Ⅲ) and Am(Ⅲ) with HDEHP： structure, bonding nature and stability

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2016年第3期59卷 324-331页

作者： juan luo congzhi wang jianhui lan qunyan wu yuliang zhao zhifang chai changming nie weiqun shi school of chemistry and chemical engineering university of south chinaHengyang 421001China laboratory of nuclear energy chemistry and key laboratory for biomedical effects of nanomaterials and nanosafety institute of high energy physicschinese academy of sciencesBeijing 100049China school of radiological and interdisciplinary sciences(rad-x)and collaborative innovation center of radiation medicine of jiangsu higher education institutions soochow universitySuzhou 215123China

Separation of trivalent lanthanides （Ln（Ⅲ）） and actinides （An（Ⅲ）） is a key issue in the advanced spent nuclear fuel repro- cessing. In the well-known trivalent actinide lanthanide separation by phosphorus reagent extraction from aqueous komplexes （TALSPEAK） process, the organophosphorus ligand HDEHP （di-（2-ethylhexyl） phosphoric acid） has been used as an efficient reagent for the partitioning of Ln（Ⅲ） from An（Ⅲ） with the combination of a holdback reagent in aqueous lactate buffer solu- tion. In this work, the structural and electronic properties of Eu3＋ and Am3＋ complexes with HDEHP in nitric acid solution have been systematically explored by using scalar-relativistic density functional theory （DFT）. It was found that HDEHP can coordinate with M（Ⅲ）（M=Eu, Am） cations in the form of hydrogen-bonded dimers HL2 （L=DEHP）, and the metal ions pre- fer to coordinate with the phosphoryl oxygen atom of the ligand. For all the extraction complexes, the metal-ligand bonds are mainly ionic in nature. Although Eu（Ⅲ） complexes have higher interaction energies, the HL2- dimer shows comparable affini- ty for Eu（Ⅲ） and Am（Ⅲ） according to thermodynamic analysis, nonahydrate. It is expected that this work could provide insightful HDEHP at the molecular level. which may be attributed to the higher stabilities of Eu（Ⅲ） information on the complexation of An（Ⅲ） and Ln（Ⅲ） with

关键词： density functional theory di-(2-ethylhexyl) phosphoric acid actinide lanthanide solvent extraction

Easily prepared and stable functionalized magnetic ordered mesoporous silica for efficient uranium extraction

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2016年第5期59卷 629-636页

作者： Wenlu Guo changming nie Lin Wang Zijie Li Lin Zhu Liuzheng Zhu Zhentai Zhu Weiqun Shi Liyong Yuan School of Chemistry and Chemical Engineering University of South ChinaHengyang 421001China Laboratory of Nuclear Energy Chemistry Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China State Key Laboratory of NBC Protection for Civilian Beijing 102205China

Functionalized magnetic Fe_3O_4@SiO_2 composite nanoparticles were prepared by simply embedding iron oxide nanoparticles into MCM-41 through one-step synthesis process, followed by aminopropyls grafting on the mesopore channels, aiming to efficiently and conveniently uptake U(VI) from aqueous solution. The resultant material possesses highly ordered mesoporous structure with large surface area, uniform pore size, excellent thermal stability, quick magnetic response, and desirable acids resistance, confirmed by Fourier transform infrared spectroscopy(FTIR), scanning electron microscopy(SEM), N_2 adsorption/desorption experiments, powder X-ray diffraction(PXRD), and thermogravimetric analysis(TGA). Detailed U(VI) sorption test indicated that this material is indeed an effective U(VI) sorbent with fast sorption kinetics of less than 2 h, large sorption capacity of 160 mg/g at p H 5.0±0.1, and desirable selectivity towards U(VI) ions over a range of competing metal ions. The absorbed U(VI) can be easily desorbed by 0.01 mol/L or more concentrated HNO_3 solution, and the reclaimed sorbent can be reused with no obvious decrease of sorption capacity even after 4 sorption-desorption cycles. The present results suggest the vast opportunities of this kind of magnetic composite on the solid-phase extraction of U(VI).

关键词： aminopropyls magnetic ordered mesoporous silica uranium sorption

在线全文

学校读者我要写书评

暂无评论

全面加强志书编纂质量管理刍议

中国地方志 2010年第12期 43-45页

作者：聂长明河南省辉县市共城大道1号市政府大院内史志办公室 453600

从修志实践上看,受撰稿人员志德、专业水平、工作经验、社会阅历所限,基层撰稿人员与主管审查验收领导对志书质量标准把握不一致,志书编纂过程程序不完善,基础环节质量保障机制缺失,审查验收制度不健全,审稿把关不够严,以及在审、编、... 详细信息

从修志实践上看,受撰稿人员志德、专业水平、工作经验、社会阅历所限,基层撰稿人员与主管审查验收领导对志书质量标准把握不一致,志书编纂过程程序不完善,基础环节质量保障机制缺失,审查验收制度不健全,审稿把关不够严,以及在审、编、校、印等环节中,重审验志稿,轻编辑校对印刷等因素影响,一些地方的志书编纂质量较差。因此,对志书(包括年鉴)编纂应全面加强质量管理,在贯彻落实《地方志书质量规定》的基础上,细化和完善本地质量管理措施,建立符合实际的质量保障机制,切实提高地方志书的编纂质量。在具体工作中把握好五个重点环节:最大限度地发挥编辑人员的群体智慧是提高志书质量的基础;建立以主编为中心的主编负责制是提高志书质量的关键;确定编纂流程管理备案制,规范编纂程序是提高志书质量的重要措施;实行志稿评议是保障志书质量的有效手段;坚持编纂督查通报和审查验收是提高志书质量的重要环节。

关键词：地方志书编纂质量制约因素保障机制

Theoretical Study on Anti-mutant HIV-1 Virus Activity of Diaryltriazine Analogs

在线全文

学校读者我要写书评

暂无评论

化学发展前沿（中英文版） 2013年第1期3卷 7-12页

作者： Huijie Liu changming nie Qingjie Zhang Yunxia Xiao Xufeng Tan School of Chemistry and Chemical Engineering University of South China Hengyang 421001 P R.China

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

多烯链平均π电子离域能的递变函数研究

化学通报 2000年第8期63卷 23-26页

作者：聂长明范明舫中南工学院化工系衡阳421001

本文把共轭体系中总离域能E～D除以共轭体系中π电子数P所得到的商定义为共轭体系中平均π电子离域能E～A～D，即E～A～D=E～D/P，考察E～A～D随结构重复单元数的递变趋势，用非线性规划得到了四个多烯链平均π电子离域的极限值。

关键词：多烯链 π电子离域能递变函数

Adsorption of U(Ⅵ) by amino-functionalized magnetic ordered mesoporous silica

在线全文

学校读者我要写书评

暂无评论

Adsorption of U(Ⅵ) by amino-functionalized magnetic ordered...

离子性指数、极化效应指数与烷烃^(13)C NMR化学位移的关系研究

中国化学会第九届全国无机化学学术会议

作者： Guo Wenlu Yuan Liyong nie changming Wei-Qun Shi Institute of High Energy Physics Chinese Academy of Sciences School of Chemistry and Chemical Engineering University of South China

Uranium, as a predominant fuel ingredient for most nuclear reactors, is the key element in nuclear fuel cycle. Moreover, its chemical and physiological toxicity can be never negligible when it is open for human exposure. In this regard, efficient removal or recovery of mobile hexavalent uranium(U(VI)) from radioactive waste water and nuclear industry involved environment is of pivotal importance for human health and environmental safety. In this study, an amino functionalized magnetic mesoporous silica with pisiform structure was fabricated, aiming at convenient removal of U(VI) from aqueous solution. The synthesized material possesses highly ordered mesoporous structure with large surface area, uniform pore size, excellent thermal stability, and quick magnetic response. The batch sorption tests revealed that this material is indeed an effective U(VI) sorbent with fast sorption kinetics, large sorption capacity of more than 160 mg/g at p H=5.0, and desirable selectivity towards U(VI) ions over a range of competing metal ions. The sorbent can be readily separated from solution by simply adding an external magnetic field. FTIR analysis were employed for an in-depth probe into the sorption mode of U(VI) onto the sorbent.

关键词： Amino Magnetic Ordered mesoporous silica Uranium Adsorption

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

有机化学 2002年第1期22卷 46-51页

作者：聂长明李忠海文松年南华大学化学化工系衡阳421001 中南林学院株洲412006

定义了烷烃分子中碳原子的离子性指数 (INI) ,用离子性指数 (INI)、极化效应指数 (PEI)及NiH(i=α,β ,γ)结构信息参数研究了烷烃的13 CNMR化学位移模型 .结果表明 ,烷烃13 CNMR化学位移 (CS)可用下式来定量描述 :CS =194 .6 15 6 - 37... 详细信息

定义了烷烃分子中碳原子的离子性指数 (INI) ,用离子性指数 (INI)、极化效应指数 (PEI)及NiH(i=α,β ,γ)结构信息参数研究了烷烃的13 CNMR化学位移模型 .结果表明 ,烷烃13 CNMR化学位移 (CS)可用下式来定量描述 :CS =194 .6 15 6 - 37.7394 (INI) +98.6 5 0 5 (ΣPEI) +2 7.16 30 (INI/ΣPEI) - 6 5 2 .910 6 (ΣPEI/INI) +0 .7735NαH+2 .2 4 6 8NβH- 0 .174 2NγH用上式估算了 30 4个碳原子的化学位移 ,平均绝对误差仅为 0 .77δ,标准差 0 .986 0δ 。

关键词：烷烃 613CNMR 化学位移离子性指数极化效应指数碳13 核磁共振结构分析

在线全文

学校读者我要写书评

暂无评论

量子拓扑指数法预测多氯联苯醚的热力学性质

化工学报 2011年第7期62卷 1808-1816页

作者：肖方竹彭国文聂长明杨胜园南华大学公共卫生学院湖南衡阳421001 南华大学化学化工学院湖南衡阳421001 图卢兹第三大学量子化学与物理实验室法国图卢兹31077 湖南大学化学生物传感与计量学国家重点实验室湖南长沙410082

应用密度泛函理论(DFT),在B3LYP/6-31+G(d)基组上优化和振动分析计算了多氯联苯醚(PCDEs)所有209种可能的分子空间几何结构,得到其各原子之间空间拓扑距离,并建立拓扑空间距离矩阵。结合分子中各原子的支化度,应用原子的平衡电负性对分... 详细信息

应用密度泛函理论(DFT),在B3LYP/6-31+G(d)基组上优化和振动分析计算了多氯联苯醚(PCDEs)所有209种可能的分子空间几何结构,得到其各原子之间空间拓扑距离,并建立拓扑空间距离矩阵。结合分子中各原子的支化度,应用原子的平衡电负性对分子图进行着色,得到量子拓扑指数PX1、PX2。采用多元线性回归技术建立联苯醚和209种可能结构的多氯联苯醚PCDEs 3种少见报道的热力学性质——标准生成热、标准生成自由能和相对自由能与PX1、PX2的定量关系拓扑模型,并用该模型分别对不同热力学性质进行预测与估算。结果表明,本方法的预测值、估算值与文献[3]的计算值均相吻合。同时,采用留一法(leave-one-out)和外检验方法测试模型的内部稳定性和外部预测能力,测试结果显示模型具有良好的稳定性和较强的预测能力。

关键词：量子拓扑指数多氯联苯醚热力学性质平衡电负性拓扑模型定量结构-性质相关