CHARACTERIZATION OF SOL-GEL FILM FOR DISSOLVED AMMONIA SENSING

Optical sensing films using organically modified silicates (ormosils) as a matrix for the determination of ammonia in water based on immobilized a fluorescent indicator aminofluorescein (AF) have been investigated. The sensing film was stability for 6 months. The detection limit of ammonia for different kind of ormosils precursors ranges from 0 01 to 0 5 μg·ml -1 (S/N 2). The response time was less than 10 min.SupportedbyNaturalScienceFoundationofFujian ;;China (D1 1 1 0 1 1

VPO催化剂前驱体的溶液法合成和结构研究

VPO polymer β NH 4(VO 2)(HPO 4) was synthesized from the mixture of NH 4VO 3 and NH 4H 2PO 4 in aqueous acidic solution. This hydrogenphosphate vanadate crystallizes in the orthorhombic space group Pbca with a=0.680 60(8) nm, b=0.925 70(5) nm, c=1.773 70(2) nm, V=1.117 5(3) nm 3, Z=8, D c=1.743 g·cm -3 , μ=88.54 cm -1 and R=0.051. The structure is built up from VO 5 square pyramid linked by trans vertices through the bridged oxygen atom to form an one dimensional isolated chain of {VO 2HPO 4} n- nunning along the a axis

Preparation,Characterization and Photocatalytic Properties of Transition Metal Ions Doping Zn3（OH）2V2O7·2H2O

通讯联系人。E-mail：[email protected]；会员登记号：S06N5685M1202[中文文摘] 利用水热法合成了3d过渡金属离子掺杂Zn3(OH)2V2O7·2H2O的微米花结构,其分子式可表达为Zn3-3xM3x(OH)2V2O7·2H2O(其中M=Cu,Co,Ni,Mn;0.001≤x≤0.20)。应用XRD、SEM、TEM、UV-Vis DRS、EDX和BET等分析测试技术对产物进行了表征。结构和形貌分析结果显示过渡金属离子掺杂后产物仍保持Zn3(OH)2V2O7·2H2O的六方晶体结构,微米花由主晶面为(0001)的纳米片组装而成。紫外-可见漫反射光谱显示过渡金属离子掺杂后带边吸收红移,其中以Cu的掺杂产物Zn3-3xCu3x(OH)2V2O7·2H2O最为明显,带边吸收扩展到可见光区。首次对Zn3(OH)2V2O7·2H2O及其不同金属离子掺杂产物Zn3-3xM3x(OH)2V2O7·2H2O进行了可见光催化降解有机污染物的研究,结果显示与其它产物相比掺0.1at%Cu的Zn2.997Cu0.003(OH)2V2O7·2H2O对亚甲基蓝(MB)的可见光催化降解效果最好。对掺杂离子种类、掺杂离子浓度对产物可见光催化性质的影响也进行了考察。[英文文摘]Transition metal ions doping Zn3(OH)2V2O7·2H2O with micro flowerlike morphologies were successfully synthesized by a surfactant-free hydrothermal method, which formula can be presented as Zn3-3xM3x(OH)2V2O7·2H2O (M=Cu, Co, Ni, Mn; 0.001≤x≤0.20). The as-prepared micro flowerlike structures were characterized by means of XRD, SEM, TEM, UV-Vis DRS, EDX and BET techniques. The results of structure and morphology analysis showed that 3d transition metal ions doped samples remained Zn3(OH)2V2O7·2H2O hexagonal structure, and the micro flowerlike structures were assembly of 2D nanosheets with (0001) main crystal facets. In UV-Vis DRS test, the spectra of as-prepared doping samples displayed red-shifts in the band-edge, and the red-shift value of Cu2+doped sample was largest. It was the first time undoping and transition metal ions doping Zn3(OH)2V2O7·2H2O were used as the photocatalysts for organic pollutant degradation under visible light irradiation. It was found that 0.1at% Cu doped sample Zn2.997Cu0.003 (OH)2V2O7·2H2O exhibited the highest photocatalytic activity for visible degradation of methylene blue (MB) among the doping and undoping analogues. Moreover, the influence facts including type and doping concentration of transition metal ions on the visible-light-driven photocatalytic activity of Zn3-3xM3x(OH)2V2O7·2H2O were also investigated.国家自然科学基金(No.21073145);国家重点研究发展计划(No.2011CBA00508)资助项

具特定晶面且大比表面积贵金属纳米晶催化基元的构筑

贵金属纳米晶在电催化等领域具有广泛应用.其催化活性往往与纳米晶体的表面结构直接相关,而催化剂的贵金属原子利用率与比表面积密切相关.因小尺寸纳米晶难以保留特定的晶面,而具有特定表面的纳米晶通常结晶成尺寸较大、比表面积比较小的晶体,调控纳米晶的尺寸和表面结构两种策略似乎相互矛盾.如何可控合成同时具有特定表面结构和大比表面积的贵金属纳米晶具有重要的意义.本综述从形貌调控角度详细介绍提高贵金属纳米晶原子利用率的方法策略;总结调控单贵金属及其合金同时具有特定晶面和大比表面积的研究现状;最后,对纳米晶的形貌调控领域未来的发展趋势提出展望.国家自然科学基金项目(No.21333008,No.21773190,No.21771153,No.21721001);;国家重大研究计划项目(No.2015CB932301);;国家重点研发计划项目(No.2017YFA0206801)资

过渡金属离子掺杂Zn_3(OH)_2V_2O_7·2H_2O的合成及其光催化性质

利用水热法合成了3d过渡金属离子掺杂Zn3(OH)2V2O7·2H2O的微米花结构,其分子式可表达为Zn3-3xM3x(OH)2V2O7·2H2O(其中M=Cu,Co,Ni,Mn;0.001≤x≤0.20)。应用XRD、SEM、TEM、UV-Vis DRS、EDX和BET等分析测试技术对产物进行了表征。结构和形貌分析结果显示过渡金属离子掺杂后产物仍保持Zn3(OH)2V2O7·2H2O的六方晶体结构,微米花由主晶面为(0001)的纳米片组装而成。紫外-可见漫反射光谱显示过渡金属离子掺杂后带边吸收红移,其中以Cu的掺杂产物Zn3-3xCu3x(OH)2V2O7·2H2O最为明显,带边吸收扩展到可见光区。首次对Zn3(OH)2V2O7·2H2O及其不同金属离子掺杂产物Zn3-3xM3x(OH)2V2O7·2H2O进行了可见光催化降解有机污染物的研究,结果显示与其它产物相比掺0.1at%Cu的Zn2.997Cu0.003(OH)2V2O7·2H2O对亚甲基蓝(MB)的可见光催化降解效果最好。对掺杂离子种类、掺杂离子浓度对产物可见光催化性质的影响也进行了考察

PREPARATION OF QUATERNARY CINCHONINE TARTRATE SALTS BY MICRO COLUMN CHROMATOGRAPHY

报道了用微型柱色谱制备用于不对称相转移催化和多相不对称催化合成的辛可宁季铵盐Preparation of quaternary cinchonine tartrate salts by micro column chromatography is described.国家自然科学基金资助项目 ( 2 99330 4 0

柠檬酸镍前驱体热分解制备镍酸镁复氧化物纯相

以组成和结构确定的柠檬酸配合物Mg2NiHcit2·10H2O和MgNiHcitH2O2·8H2OH4cit为柠檬酸为前驱体热分解得到Ni和Mg摩尔比分别为1∶2和2∶1的镍酸镁纯相Mg2NiO3和MgNi2O3。粉末衍射实验证实它们是由半径相近、价态相等的Ni2+和Mg2+形成的固溶体

Hydro(solvo)thermal construction of a copper coordination polymer involving in situ ligand synthesis: Preparation and Structure of [Cu-3(bdcO)(2)(H2O)(2)](n)

A hydro(solvo)thermal reaction of 1,3-benzenedicarboxylic acid (bdcH(2)) and CuSO4.5H(2)O produced a coordination polymer [Cu-3(bdcO)(2)(H2O)(2)](n) 1. The alkoxyl-1,3-benzene-dicarboxylate trianion (bdcO(3-)) found in the final product was in situ generated by the hydroxylation of bdcH(2) during the synthesis. Its crystal structure has been determined by X-ray structural analysis. The complex belongs to a monoclinic system, space group P2(1)/c with C16H10Cu3O12, M-r = 584.86, a = 5.0349(3), b = 10.422(1), c = 15.639(1) angstrom, beta = 91.977(2)degrees, V = 820.1(1) angstrom(3), Z = 2, D-c= 2.368 g/cm(3), mu = 3.931 mm(-1), lambda(MoK alpha) = 0.71073 angstrom, F(OOO) = 578, the final R = 0.0328 and wR = 0.0742 for 1730 observed reflections with 1 >=,2 sigma(I). The copper atoms show different coordination environments. Each bdcO group is binds to three copper atoms through oxygen atoms of carboxylates and deprononated hydroxy group in bridging and chelating fashions, affording a copper atom coordinated by two [Cu-2(bdcO)(2)](2-), matallo-ligand' to yield an extending zigzagged layer perpendicular to the c axis

高指数晶面裸露的贵金属纳米晶体的合成

由于在高指数晶面上存在高密度的台阶位、扭结位原子等,高指数晶面裸露的贵金属纳米晶体一般表现出优越的物理化学性能,在催化、电化学等方面都有很重要的应用前景.近年来,研究人员围绕高指数晶面的制备进行了大量的工作并取得了一定进展.本文重点从合成制备方法的角度出发,结合本课题组的相关研究,系统总结了现有的有关制备高指数晶面裸露的贵金属纳米晶体的一些最新研究成果.从电化学方法、"帽"式试剂保护法、欠电位沉积原子层保护法、动力学调控、氧化刻蚀溶解再生长法以及模板法等几个方面对现有的高指数晶面裸露的贵金属纳米晶体的制备进行了总结

A novel solid-state electrochemiluminescence sensor for the determination of hydrogen peroxide based on an Au nanocluster-silica nanoparticle nanocomposite

National Nature Scientific Foundation of China [21175112]; National Basic Research Program of China [2010CB732402]; NFFTBS [J1210014]A gold nanocluster@bovine serum albumin-silica nanoparticle composite has been synthesized and used for the solid-state electrochemiluminescence (ECL) sensing of hydrogen peroxide. The ECL characteristics have also been studied