铁促进的Cu/SiO2-Al2O3催化剂上高效气相合成3-甲基吲哚

以苯胺和生物质来源的丙三醇为反应原料,在铁促进的Cu/SiO2-Al2O3催化剂上气相合成了3-甲基吲哚,采用X射线光电子能谱、氢气程序升温还原(H2-TPR)、X射线衍射、透射电子显微镜、电感耦合等离子体发射光谱(ICP)、氨程序升温脱附(NH3-TPD)以及热重(TG)分析等技术对催化剂进行了表征.结果表明,向Cu/SiO2-Al2O3催化剂加入铁助剂不仅能明显提高催化剂的活性和选择性,而且能大大改善催化剂的稳定性.在Cu-Fe/ SiO2-Al2O3催化剂上,反应3h,3-甲基吲哚收率能够达到48％,而且催化剂经过再生可以重复使用,即使反应43 h,其产物收率也没有明显的降低.各种表征表明,向Cu/SiO2-Al2O3加入铁助剂能增强铜和载体之间的相互作用,由此大大提高了铜粒子在载体表面的分散度,并且有效减少了反应过程中铜组分的流失;此外,铁助剂还能显著减少催化剂的中强酸中心数,增加弱酸中心数,从而提高3-甲基吲哚的选择性,并且抑制了积炭的形成.     

配合物[Ni（H2B（pyrazolyl）2）2]的非等温热分解动力学研究

在甲醇溶液中用Ni(CH3COO)2.4H2O和NaH2B(pz)2常温下合成出了配合物[Ni(H2B(pz)2)2](pz=pyrazolyl),并用元素分析、红外光谱和X射线衍射等对配合物的结构进行了表征,对此配合物进行了非等温热分解动力学研究.采用了微分Achar和积分Coats-Redfern法分别拟合出配合物2个热分解阶段的动力学方程及相应的动力学参数.配合物第一热分解阶段可能的机理为三维扩散,球形对称,其动力学方程为dα/dT=3(A/β)e-E/RT[(1-α)-1/3-1]-1/2.配合物第二热分解阶段可能的机理为相边界反应,圆柱形对称(n=1/2),其动力学方程为dα/dT=2(A/β)e-E/RT(1-α)1/2.2个反应阶段的表观活化能平均值分别为260.87和176.27kJ/mol,lnA的平均值分别为65.65和37.11s-1.     

基于四氟对苯二甲酸为配体的两个锌(Ⅱ)的配合物的合成、晶体结构和荧光性质

本文以四氟对苯二甲酸(H2tfbdc)和2,2′-联吡啶(bpy)为配体,合成了2个锌(Ⅱ)的配合物[Zn2(bpy)4(Htfbdc)2(tfbdc)](1)and[Zn(bpy)(H2O)2(tfbdc)](2)。并用元素分析、红外光谱、X-射线单晶衍射结构分析、热重分析等对其进行了表征。化合物1和2均属于三斜晶系,空间群为P1。配合物1和2中的锌(Ⅱ)离子分别位于畸变的八面体和畸变的三角双锥构型中。配合物1为双核结构,它们通过分子间氢键进一步形成一个二维的结构;配合物2是一个单核的两性离子,两性离子间通过氢键形成一个三维的空间网状超分子结构。考察了两种配合物的固体荧光性质。     

Adsorptive removal of La(III) from aqueous solutions with 8-hydroxyquinoline immobilized GMZ bentonite

Due to the low permeability, high swelling capacity and good retardation properties, bentonite has been considered as the main component of buffer/backfill material for high level radioactive wastes repository all over the world. The adsorptions of metal ion were widely investigated recently. In this presentation, we provide an easy-to-use method to immobilize 8-hydroxyquinoline onto the surface of bentonite for the use of adsorption studies of La(III) from the aqueous solution. The effects of various parameters such as contact time, pH of the solution, ionic strength and metal ion concentration on the adsorption were investigated by the batch experiments. The biggest adsorption capacity is 41.7 mg/g, higher than the value reported by our previous work which is performed by the raw bentonite. Langmuir isotherm fits the experimental data well and the adsorption follows pseudo-second-order kinetic model. In summary, 8-hydroxyquinoline immobilized GMZ bentonite is an effective adsorbent for the removal of La(III) from aqueous solutions.     

唾液酸衍生物的合成进展

唾液酸是一类九碳糖,主要以糖脂或者糖蛋白的形式广泛分布于哺乳动物组织中,是脊椎动物细胞表面最重要的单糖.唾液酸可修饰的位点较多,目前已发展出成千上万的非天然唾液酸衍生物用于分子成像.尽管如此,非天然糖代谢工程方法还处于发展的初期,很多方面亟待发展和完善.结合本课题组的研究成果,着重介绍了唾液酸衍生物的合成进展.     

共轭聚合物荧光纳米粒子研究进展

近年来,共轭聚合物荧光纳米粒子因其优异的光学性能,在化学、医学和环境科学等研究领域显示了极其广阔的应用前景.相比于传统无机半导体荧光纳米材料,共轭聚合物荧光纳米粒子具有结构多样性、功能可设计性、生物相容性好等显著优势.本文从共轭聚合物荧光粒子的制备方法、光学性能、表面功能化修饰出发,重点讨论了近年来共轭聚合物纳米粒子作为荧光探针在细胞成像及生物化学检测方面的研究进展,阐述了当前研究的主要发展方向和仍需解决的问题.     

Development of novel graphene-like layered hexagonal boron nitride for adsorptive removal of antibiotic gatifloxacin from aqueous solution

Graphene-like layered hexagonal boron nitride (g-BN) was prepared and characterized. The performance of using g-BN as an adsorbent for removal of fluoroquinolone antibiotic gatifloxacin (GTF) from aqueous solution was evaluated. g-BN showed an excellent adsorption capability with notable GTF adsorption ratio of more than 90%. Data of equilibrium adsorption of GTF onto g-BN at different temperatures were represented by Langmuir, Freundlich and Tempkin isotherm models, and Langmuir exhibited the best fitting with the maximum adsorption capacity of 88.5 mg·g^?1 at 288 K. GTF adsorption was insignificantly affected by solution pH. Competitive role of Na⁺ and Ca²⁺ in the solution inhibited the adsorption of GTF and decreased the adsorption capacity a bit. The adsorption process was spontaneous and exothermic. The adsorption was probably governed by π–π interaction between GTF and g-BN, and electrostatic interaction may also exist in the adsorption process.     

尼龙6微孔发泡材料的制备及泡孔形貌调控

本文利用共混改性方法得到高熔体强度尼龙6基体,通过探索不同的工艺条件,获得不同倍率的尼龙6发泡材料,系统研究不同离聚体改性剂比例下对其熔体强度的影响.通过热性能测试和流变测试推测了其中微交联结构的存在.通过调节发泡工艺制备不同发泡倍率的尼龙6发泡材料,用扫描电镜(SEM)观测泡孔形貌.结果 表明,离聚体的加入大大提升尼龙6基体的熔体强度,实现了尼龙6超临界二氧化碳发泡的可能性,并获得了较大倍率的尼龙发泡材料.     

Investigation on the Interaction of Dy(Ш)/Rutin Complexes with Bovine Serum Albumin by Spectroscopic Methods

Journal of Solution Chemistry - The interaction between Dy(Ш)/Rutin complexes and bovine serum albumin (BSA) was studied by fluorescence, ultraviolet (UV) absorption, three-dimensional...     

顺二醇类生物分子的硼亲和分子印迹研究进展EI北大核心CSCD

含顺二酚的分子,如糖类、糖苷和糖蛋白等,在糖组学、代谢组学和蛋白质组学等不同领域都有着至关重要的作用。但是这类样品分子通常存在于非常低丰度的环境中且与许多干扰化合物共存,给临床和生物学上的分离检测带来了巨大的困难。因此,开发建立对顺二醇类化合物简单高效的分离方法具有重要意义。分子印迹技术,是基于模拟生物体内抗原与抗体相互作用原理而发展起来的一种新兴技术,近年来因其特定的分子识别能力以及材料的稳定性和重复性而引起了广泛关注,也在顺二醇类化合物的分离方面得到了许多应用。本综述总结了在顺二醇类化合物的分子印迹方面的最新进展,并对其未来发展的方向和前景进行了讨论。