柠檬酸交联环糊精金属有机框架材料的制备及对结晶紫的吸附

环糊精金属有机框架材料(CD-MOFs)是一种绿色环保的新型金属有机框架材料,但由于其水稳定性差,在实际应用中受到了限制。通过交联CD-MOFs和柠檬酸(CA)来提高环糊精基MOFs的水溶液稳定性。研究制备了CA改性的CA-γ-CD-MOF复合材料,并作为吸附剂从水溶液中去除阳离子染料结晶紫。在15mg CA-γ-CD-MOF用量、20℃、pH 6和60mg/L初始结晶紫浓度下,CA-γ-CD-MOF对结晶紫的平衡吸附能力为79.86mg/g,相应的清除率达到99.83%。此外,CA-γ-CD-MOF在经过3次吸附解吸循环,吸附率仍达第一次的98%以上,表现出良好的再生能力。动力学和吸附等温线研究表明,吸附遵循拟二阶动力学,CA-γ-CD-MOF吸附结晶紫是一种自发的单层吸热过程。因此,CA-γ-CD-MOF是一种高效、绿色、可循环利用的吸附剂。     

金属有机框架材料中CO2/N2吸附与分离的理论研究

金属有机框架(MOFs)材料在CO₂的捕获与分离方面受到广泛关注。本工作结合分子动力学(MD)和巨正则蒙特卡洛(GCMC)模拟方法探究了一种MOFs材料DUT-49的负性气体吸附过程及结构转变对CO₂/N₂吸附分离行为的影响。结果表明: 在20~60 MPa的压强下, DUT-49均发生可稳定存在的结构变形, 实现开孔(DUT-49-op)和闭孔(DUT-49-cp)状态的转变。DUT-49气体吸附量随温度升高而下降。DUT-49-cp的框架收缩, 气体有效吸附位点减少, 吸附量明显降低。此外, 与DUT-49-op相比, DUT-49-cp中CO₂/N₂选择性明显降低, 且随温度升高而下降, 不利于气体分离。本工作的研究结果为吸附剂材料的开发提供了科学依据。     

Fe-BTC@芳纶复合材料的制备及其性能研究

采用层层自组装的方式在芳纶织物的表面负载金属有机框架材料(MOF)Fe-BTC。通过红外光谱、扫描电镜、能谱分析了Fe-BTC@芳纶的表面形态以及组成结构。并测试了Fe-BTC@芳纶催化双氧水降解异丙隆的性能。结果表明：循环自组装20次的Fe-BTC@芳纶复合材料在双氧水浓度为20mmol/L下,24h可将5mg/L异丙隆完全降解。Fe-BTC@芳纶对大肠杆菌的抑菌率达到了97.4%,表明Fe-BTC@芳纶在水处理和化学防护方面具有潜在的应用前景。     

花状Co_3O_4微球的制备及其对碱性品红的吸附性能研究

通过调节溶剂热合成工艺制备了两种花状中空四氧化三钴(Co3O4)微球,并采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、氮气吸附脱附仪、紫外-可见吸收光谱仪(UV-Vis)、红外光谱仪(FT-IR)等手段对Co3O4微球的形貌、尺寸、晶形结构、孔性能等进行了表征。结果表明,两种微球尺寸均为微米级,Co3O4晶体结构为立方相尖晶石结构;两种微球的比表面积分别为26.77和2.51m2/g。两种Co3O4微球对污染物碱性品红的吸附性及解吸再利用性的研究结果显示,Co3O4微球对碱性品红的最大饱和吸附量为2.7mg/g,且重复再生循环6次后,吸附效率仍保持在60%以上。     

金属有机框架复合材料的制备及其性能研究

通过气态扩散作用,合成了MIL-101(Cr)@[Fe(HB(pz)3)2]、NH2-MIL-101(Al)@[Fe(HB(pz)3)2]和MIL-100(Al)@[Fe(HB(pz)3)2]3种MOFs材料@([Fe(HB(pz)3)2])复合物。采用红外光谱仪、原子吸收光谱仪、X射线衍射仪、物理吸附仪对3种MOFs材料@[Fe(HB(pz)3)2]复合物的组成、结构和性能进行表征测试。测试结果表明:[Fe(HB(pz)3)2]成功进入MOFs材料的孔洞中,形成了MOFs材料@[Fe(HB(pz)3)2]的复合物;MOFs材料的孔洞结构使[Fe(HB(pz)3)2]形成了一层保护外壁,从而使复合物的热稳定性和化学稳定性。经原子吸收光谱测试,可知MIL-101(Cr)@[Fe(HB(pz)3)2]、NH2-MIL-101(Al)@[Fe(HB(pz)3)2]和MIL-100(Al)@[Fe(HB(pz)3)2]中分别含有质量分数为8.11%,7.42%和1.64%的[Fe(HB(pz)3)2]。最后,对比分析了MIL-101(Cr)@[Fe(HB(pz)3)2]、NH2-MIL-101(Al)@[Fe(HB(pz)3)2]与[Fe(HB(pz)3)2]经多次转变后的颜色变化情况,实验结果表明,MOFs材料@[Fe(HB(pz)3)2]的复合物可应用到防伪包装材料之中。     

微波辅助合成Ni-gallate(镍基没食子酸金属有机框架)用于CO2吸附的性能研究

CO₂排放导致的一系列环境问题,引起广泛关注,金属有机框架(MOFs)因其超高的孔隙率比表面积,被认为是捕集CO₂的理想材料。采用微波辅助合成Ni-gallate(镍基没食子酸金属有机框架),并借助扫描电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)、X射线衍射(XRD)等表征手段进行分析。结果表明：相较于传统水热合成,微波辅助合成的材料有着较高的结晶度和规则的尺寸形貌,在25℃时表现出更高的CO₂吸附量(3.82mmol/g)。结合微波辅助合成快速高效的优点,通过相转化法和聚酰亚胺复合得到的聚合物材料,不仅具有良好的CO₂吸附性能,而且有着优异的机械和热稳定性,有进一步发展成为工业CO₂捕集材料的潜力。     

新型荧光材料二水合-[N,N,-双(2-苯胺基)乙二酰胺] 合锌的合成与表征

合成了新型荧光材料二水合-[N,N,-双(2-苯胺基)乙二酰胺]合锌,并用元素分析、红外、紫外、核磁共振等进行了表征,通过对其荧光性能的研究,证明该化合物是一种较好的新型荧光材料。     

Geometric isomerism of layered complexes of uranyl selenates: Synthesis and structure of (H3O)[C5H14N]2[(UO2)3(SeO4)4(HSeO4)(H2O)] and (H3O)[C5H14N]2[(UO2)3(SeO4)4(HSeO4)(H2O)](H2O)

New uranyl selenates with organic cations (H₃O)[C₅H₁₄N]₂[(UO₂)₃(SeO₄)₄(HSeO₄)(H₂O)] (I) and (H₃O)[C₅H₁₄N]₂[(UO₂)₃(SeO₄)₄(HSeO₄)(H₂O)](H₂O) (II) were synthesized by evaporation of aqueous solutions and studied. Compound I has monoclinic symmetry, space group C2/c, a = 16.7572(13), b = 11.7239(12), c = 19.0490(13) Å, β = 98.875(6)°, V = 3697.6(5) ų, Z = 4. The crystal structure was solved by the direct method and refined to R ₁ = 0.085 for 2868 reflections with |F _hkl | ≥ 4σ|F _hkl |. Compound II has monoclinic symmetry, space group P2₁/n, a = 10.8252(10), b = 19.0007(10), c = 18.6463(15) Å, β = 100.324(7)°, V = 3773.2(5) ų, Z = 4. The crystal structure was solved by the direct method and refined to R ₁ = 0.084 for 5721 reflections with |F _hkl | ≥ 4σ|F _khl |. The structures of I and II are based on layered complexes [(UO₂)₃(SeO₄)₄(HSeO₄)(H₂O)]^3? formed by combination of uranyl pentagonal bipyramids and selenate tetrahedra. H₃O⁺ cations, water molecules, and protonated methylbutylamine cations are located in the interlayer space. Geometric isomerism of two-dimensional complexes [(UO₂)₃(SeO₄)₅(H₂O)] in the structures of uranyl selenates was found and described.     

Synthesis,crystal structure and solubility of C6H14N4O2,C4H4O4,2H2O

Synthesis, crystal structure and solubility of a new non-linear optical material l-arginine maleate dihydrate have been reported here. From the solubility studies with different solvents, water was found to be the most suitable one. Title compound crystallized in the triclinic space group P1 with Z=1 and unit cell dimensions a=5.264(3) Å, b=8.039(3) Å, c=9.784(3) Å, α=106.19(3)°, β=97.24(3)°, γ=101.66(2)°. The present complex of l-arginine contains a positively charged zwitterionic arginine molecule and a negatively charged semi-maleate ion. The molecules are held together by a three-dimensional network of hydrogen bonds.     

Crystal structure of a new organic dihydrogenomonophosphate (C6H8N3O)2(H2PO4)2

Chemical preparation, X-ray single-crystal, thermal behavior, and IR spectroscopy investigations are given for a new organic cation dihydrogenomonophosphate (C₆H₈N₃O)₂(H₂PO₄)₂ (denoted IAHP) in the solid state. This compound crystallizes in the orthorhombic space group P2₁2₁2₁. The unit cell dimensions are: a = 7.422(3) Å, b = 12.568(5) Å, c = 20.059(8) Å with V = 1871.1(13) Å³ and Z = 4. The structure has been solved using direct method and refined to a reliability R factor of 0.029. The atomic arrangement can be described as inorganic layers of H₂PO₄⁻ anions between which are located the organic groups (C₆H₈N₃O)⁺ through multiple hydrogen bonds.     

Synthesis and structural study of new potassium uranyl selenates K2(H5O2)(H3O)[(UO2)2(SeO4)4(H2O)2](H2O)4 and K3(H3O)[(UO2)2(SeO4)4(H2O)2](H2O)5

Single crystals of new uranyl selenates K₂(H₅O₂)(H₃O)[(UO₂)₂(SeO₄)₄(H₂O)₂](H₂O)₄ (1) and K₃(H₃O)[(UO₂)₂(SeO₄)₄(H₂O)₂](H₂O)₅ (2) were prepared by isothermal evaporation at room temperature. The crystal structure of 1 was solved by the direct method [C2/c, a = 17.879(5), b = 8.152(5), c = 17.872(5) Å, β = 96.943(5)°, V = 2585.7(19) ų, Z = 4] and refined to R ₁ = 0.0449 (wR ₂ = 0.0952) for 2600 reflections with |F _o| ≥ 4σ _F . The structure of 2 was solved by the direct method [P2₁/c, a = 17.8377(5), b = 8.1478(5), c = 23.696(1) Å, β = 131.622(2)°, V = 2574.5(2) ų, Z = 4] and refined to R ₁ = 0.0516 (wR ₂ = 0.1233) for 4075 reflections with |F _o| ≥ 4σ _F . The structures of 1 and 2 are based on [(UO₂)₂(SeO₄)₄(H₂O)₂]^4? layers. The charge of the inorganic layer is compensated by potassium and oxonium ions arranged in the interlayer space. Each K ion is surrounded by seven O atoms belonging to uranyl selenate layers and water molecules, so that it binds with each other the adjacent uranyl selenate structural elements.     

氟表面活性剂C_8F_(17)SO_2N(C_2H_5)C_2H_4(OC_2H_4)的合成与性能

以全氟辛基磺酰氟为原料,与乙胺在异丙醚中加热反应制得N 乙基全氟辛基磺酰胺,再与2 氯乙醇在加热回流下反应得到N 乙基N 乙醇全氟辛基磺酰胺,随后在碱性条件,加热和带压下与环氧乙烷进行聚合反应,得到表面活性剂C8F17SO2N(C2H5)C2H4(OC2H4)nOH,n=8～9。该活性剂在质量浓度为0.05%时就可将表面张力降至19.2mN/m以下,具有良好的表面活性。运用IR,NMR,DSC,TG等技术对该表面活性剂进行了表征和研究。     

Proton Conductivity of Cs2MnH3(P2O7)2 and Rb2MnHP2O7(H2PO4)2

Cs₂MnH₃(P₂O₇)₂ and Rb₂MnHP₂O₇(H₂PO₄)₂ are shown to have an appreciable proton conductivity: 5 × 10^–8 and 2 × 10^–5 S/cm in the Cs compound at 298 and 400 K, respectively, and 10^–7 and 4 × 10^–7 S/cm in the Rb compound. The conductivity and structural data are analyzed in relation to the mechanisms of protonic conduction in these mixed phosphates.     

Nucleation studies in supersaturated aqueous solutions of (NH4)H2PO4 doped with (NH4)2C2O4·H2O

Induction periods were measured for various supersaturated aqueous solutions of ammonium dihydrogen orthophosphate doped with ammounium oxalate monohydrate by the direct vision method. Various critical nucleation parameters were calculated based on classical theory for homogeneous crystal nucleation and the results reported and discussed. The critical nucleation parameters increased with increase in doping concentration.