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采用5-((4-吡啶基)甲氧基)-异烟酸(H2PLIA)、1,3,5-三(1-咪唑基)-苯(TIB)合成了金属有机骨架[Cd(PLIA)(TIB)]n (MOF-1),MOF-1是具有理想一维孔道的二维结构化合物,其一维孔道由柔性三角形PLIA2-配体和刚性三角形TIB配体间隔形成。利用MOF-1 易掺杂的优势,采用后修饰合成策略制备了Tb@MOF-1。对MOF-1 和Tb@MOF-1 进行了基本表征及荧光探针性能研究。2种探针材料具有相同的结构。MOF-1和Tb@MOF-1分别对水溶液中的Cr2O72-和S2O82-离子具有较强荧光识别能力,均有响应时间快,稳定性、选择性、灵敏度高的特点。研究了MOF-1和Tb@MOF-1对Cr2O72-和S2O82-的荧光识别机理,其不同可能与Tb3+离子掺杂有关。 相似文献
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采用成核晶化隔离法将Co2+引入层状双金属氢氧化物(LDHs),得到了含不同Co2+/Al3+物质的量的比为1∶1,2∶1,3∶1的二元钴铝碳酸根型LDHs(CoAl-LDHs)。通过X射线衍射(XRD)、透射电镜(TEM)、扫描电镜-能量散射谱(SEM-EDS)、拉曼光谱(Raman)、程序升温还原(TPR)及X射线光电子能谱(XPS)等方法对CoAl-LDHs焙烧产物的结构、组成及其化学气相沉积(CCVD)催化生长多壁碳纳米管(CNTs)进行了研究。结果表明:CoAl-LDHs前体中钴的含量可以明显改变焙烧产物的组成分布和还原性能,并最终影响CNTs的生长,其中以nCo2+/nAl3+比为2/1的LDHs作为催化剂前体可以得到管径均匀和石墨化程度高的CNTs,这与还原得到的纳米活性Co颗粒均匀分散有关。 相似文献
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通过乳酸衍生物和3-溴-4-羟基苯甲酸的组合得到对映体3-溴-4-(((1R)-1-羧基乙基)氧基)苯甲酸(R-H2bba)和3-溴-4-(((1S)-1-羧基乙基)氧基)苯甲酸(S-H2bba)。以其为手性合成子在水热条件下分别与1,3-二(吡啶-4-基)丙烷(1,3-dpp)和Ni2+反应,构建了对映手性配位聚合物{[Ni(R-bba)(1,3-dpp)(H2O)0.5]·1.5H2O}n (HU12-R)和{[Ni(S-bba)(1,3-dpp)(H2O)0.5]·1.5H2O}n (HU12-S)。结构分析揭示HU12-R和HU12-S是具有dia网络特征的三维螺旋骨架。在骨架中,阴离子配体R-bba2-和S-bba2-分别与Ni2+中心连接在一起围绕21螺旋轴得到一对小的对映螺旋链,而1,3-dpp与Ni2+中心则围绕41螺旋轴构建出另外一对大的对映螺旋链。电化学测试显示HU12-R属n型半导体,具有低阻抗性质,对紫外可见光有很强的吸收能力。进一步光催化实验证实在紫外光照射下所得配合物对染料降解有明显催化效果。 相似文献
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采用改进的水热法成功合成了单分散的纯相锶铁氧体纳米片。借助DLS、XRD、FTIR、SEM、EDS和VSM等分析测试手段对SrFe12O19铁氧体粉体的粒度、结构、形貌和磁性能进行表征。研究结果表明,在240℃保温5 h,物质的量之比nFe3+/nSr2+(RF/S)和nOH-/nNO3-(RO/N)分别为5和2时,所得产物为单分散的纯相六角SrFe12O19铁氧体纳米片。随着RF/S和RO/N的变化,合成样品中有少量SrCO3和Fe2O3杂相存在,这主要与反应条件和离子比例有关。磁性能测试结果显示,所得纯相的六角SrF12O19铁氧体纳米片具有优异的磁性能,其饱和磁化强度和矫顽力分别达到60.91 emu·g-1和94.83 kA·m-1,使其在医疗、催化和生物等高技术领域具有潜在的应用。 相似文献
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尝试用氨蒸发诱导合成方法在石墨小片上生长球形Co3O4微粒, 并用其制备电极且进行S2-的电化学氧化研究. 用极化曲线、恒电位技术等电化学方法考察了Co3O4电极对S2-的电化学氧化的催化性能, 发现Co3O4电极对电化学氧化S2-具有优异的催化性能, 极大地促进了-0.40 V 附近S2-向含硫的酸根离子和低级多硫离子的转变, 电流密度最大可以达到580 mA·cm-2. 恒电位极化表明电极的电催化稳定性良好; 电化学阻抗谱(EIS)测试显示Co3O4在碱性S2-电解液中的电荷转移电阻很小, 这从电化学动力学角度解释了它对S2-具有良好的催化性能. 相似文献
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采用5-((4-吡啶基)甲氧基)-异烟酸(H2PLIA)、1,3,5-三(1-咪唑基)-苯(TIB)合成了金属有机骨架[Cd (PLIA)(TIB)]n (MOF-1)。MOF-1是具有理想一维孔道的二维结构化合物,其一维孔道由柔性三角形PLIA2-配体和刚性三角形TIB配体间隔形成。利用MOF-1易掺杂的优势,采用后修饰合成策略制备了Tb@MOF-1。对MOF-1和Tb@MOF-1进行了基本表征及荧光探针性能研究。2种探针材料具有相同的结构。MOF-1和Tb@MOF-1分别对水溶液中的Cr2O72-和S2O82-离子具有较强荧光识别能力,均有响应时间快,稳定性、选择性、灵敏度高的特点。研究了MOF-1和Tb@MOF-1对Cr2O72-和S2O82-的荧光识别机理,其不同可能与Tb3+离子掺杂有关。 相似文献
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为研究草酸钙(CaC2O4)晶体成核、生长和聚集,探讨降解茯苓多糖(PCP)的抑制作用,采用X射线衍射、FT-IR、扫描电镜、拉曼光谱、ζ电位仪和紫外分光光度计等方法对不同条件下形成的 CaC2O4晶体进行表征。结果表明,在低过饱和度(RS≤26.6)时,主要生成一水草酸钙(COM)晶体;至RS为37.6和46.0时分别生成了11.6%和38.3%的二水草酸钙(COD)晶体,且高RS时晶体的聚集程度增加。在RS相同时,随着Ca2+/Ox2-(Ox2-=C2O42-)化学计量比(nCa2+/nOx2-)增大,晶体中COD比例增加。降解PCP的加入可增加体系中可溶性Ca2+浓度,减少生成的CaC2O4晶体质量,增加晶体表面ζ电位绝对值,这些均有利于抑制CaC2O4结石的形成。因此,高Ox2-浓度对肾结石形成的风险远大于高Ca2+浓度,提示草酸的摄入对CaC2O4结石的风险远远大于钙的摄入,降解PCP能同时抑制CaC2O4晶体的成核、生长和聚集。 相似文献
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氢氧化2,9,16,23-四羧基酞菁合铁(Ⅲ)与硫醇轴配反应 总被引:1,自引:0,他引:1
用分光光度法研究了酞菁合铁[Fe(Ⅲ)Pc(COOH)4OH-]与β-羟基乙硫醇(HOCH2CH2SH)的轴向配位反应热力学,求得了配位数(n),稳定常数(βn)及热力学参数ΔrH0m、ΔrS0m。用停流法研究了[Fe(Ⅲ)Pc(COOH)4OH-]与β-羟基乙硫醇及苯硫酚的轴配反应动力学,讨论了反应机理,求得了预平衡步的平衡常数(K)和速控步的速率常数(k);研究了温度等诸因素对反应动力学的影响,得到了预平衡的ΔrH0m、ΔrS0m和速控步的活化参数Δ≠Hm、Δ≠Sm 相似文献
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含八齿苦味酸根的超分子苦味酸钾的合成和结构 总被引:1,自引:0,他引:1
A supramolecular complex, [Kpic]n (pic- is picratol, (NO2)3C6H2O-), has been synthesized unexpectedly in acetone solution, and characterized by elemental analysis, IR and X-ray crystallography. In the complex, the K+∶pic- is 1∶1, and one K(Ⅰ) ion is surrounded by six picrate anions, one picrate anion can coordinate to six K(Ⅰ) ions. The coordination number of every potassium atom is eight. Interestingly, the picratol adopts an eight-coordinated ideal mode unreported. CCDC: 630627. 相似文献
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Brígida Maria Villar da Gama Rangabhashiyam Selvasembian Dimitrios A. Giannakoudakis Konstantinos S. Triantafyllidis Gordon McKay Lucas Meili 《Molecules (Basel, Switzerland)》2022,27(15)
Within the frame of this article, briefly but comprehensively, we present the existing knowledge, perspectives, and challenges for the utilization of Layered Double Hydroxides (LDHs) as adsorbents against a plethora of pollutants in aquatic matrixes. The use of LDHs as adsorbents was established by considering their significant physicochemical features, including their textural, structural, morphological, and chemical composition, as well as their method of synthesis, followed by their advantages and disadvantages as remediation media. The utilization of LDHs towards the adsorptive removal of dyes, metals, oxyanions, and emerging pollutants is critically reviewed, while all the reported kinds of interactions that gather the removal are collectively presented. Finally, future perspectives on the topic are discussed. It is expected that this discussion will encourage researchers in the area to seek new ideas for the design, development, and applications of novel LDHs-based nanomaterials as selective adsorbents, and hence to further explore the potential of their utilization also for analytic approaches to detect and monitor various pollutants. 相似文献
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碳酸钾或碳酸钠颗粒作催化剂基底,采用化学气相沉积(CVD)制得类似于石墨烯的层状碳材料,并经原位化学沉积可得层状碳/硫酸铅复合材料. 用X射线衍射(XRD)、热重分析、扫描电镜(SEM)和透射电镜(TEM)分析与测试样品. 结果表明,层状碳为无定型碳层,复合材料为无定型碳层与附着其上的细小硫酸铅颗粒的复合. 上述层状碳和复合材料作为负极添加剂应用于铅酸电池中,测试了电池电化学性能. 结果表明,电池大电流放电比容量和循环寿命均明显提高. 通过电化学交流阻抗谱图(EIS)、充放电曲线和负极失效后的SEM照片证实,加入添加剂能够降低反应阻抗、减小极化及有效抑制极板硫酸盐化. 相似文献
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Binta Hadi Jume Niloofar Valizadeh Dana Marjan Rastin Ehsan Parandi Negisa Darajeh Shahabaldin Rezania 《Molecules (Basel, Switzerland)》2022,27(24)
In this study, a novel biomass adsorbent based on activated carbon incorporated with sulfur-based binary metal oxides layered nanoparticles (SML-AC), including sulfur (S2), manganese (Mn), and tin (Sn) oxide synthesized via the solvothermal method. The newly synthesized SML-AC was studied using FTIR, FESEM, EDX, and BET to determine its functional groups, surface morphology, and elemental composition. Hence, the BET was performed with an appropriate specific surface area for raw AC (356 m2·g−1) and modified AC-SML (195 m2·g−1). To prepare water samples for ICP-OES analysis, the suggested nanocomposite was used as an efficient adsorbent to remove lead (Pb2+), cadmium (Cd2+), chromium (Cr3+), and vanadium (V5+) from oil-rich regions. As the chemical structure of metal ions is influenced by solution pH, this parameter was considered experimentally, and pH 4, dosage 50 mg, and time 120 min were found to be the best with high capacity for all adsorbates. At different experimental conditions, the AC-SML provided a satisfactory adsorption capacity of 37.03–90.09 mg·g−1 for Cd2+, Pb2+, Cr3+, and V5+ ions. The adsorption experiment was explored, and the method was fitted with the Langmuir model (R2 = 0.99) as compared to the Freundlich model (R2 = 0.91). The kinetic models and free energy (<0.45 KJ·mol−1) parameters demonstrated that the adsorption rate is limited with pseudo-second order (R2 = 0.99) under the physical adsorption mechanism, respectively. Finally, the study demonstrated that the AC-SML nanocomposite is recyclable at least five times in the continuous adsorption–desorption of metal ions. 相似文献
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Hideyuki Tagaya Sumikazu Ogata Satoshi Nakano Jun-Ichi Kadokawa Masa Karasu Koji Chiba 《Journal of inclusion phenomena and macrocyclic chemistry》1998,31(3):231-241
The inner surfaces of inorganic layered compounds such as aluminium dihydrogen-triphosphate (ADHP) and layered double hydroxide (LDH) were modified by azo compounds. Upon intercalation of 4-phenylazoaniline and 4,4-azodianiline into ADHP, the interlayer spacing increased from 6.4 to 21.5 Å and 20.6 Å, respectively. The intensity of IR peaks due to P-–OH of ADHP and amino groups of guests decreased by the thermal treatment of the intercalates. The interlayer spacings also decreased to 16.9 Å and 16.7 Å, respectively, indicating a dehydration reaction between P–-OH and amino groups. The LDH inner surface was modified by the reaction with trans-p-phenylazobenzoylchloride (PAB-Cl). Upon surface modification, the interlayer spacing increased from 7.6 Å to about 27 Å. The absorption of this surface-modified LDH near 410 nm increased upon irradiation with UV light and decreased upon irradation with visible light, indicating the occurrence of trans–cis isomerization of PAB-Cl between the layers. 相似文献
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Mikael Trollss Hans Claesson Bjrn Atthoff James L. Hedrick 《Angewandte Chemie (International ed. in English)》1998,37(22):3132-3136
A star-shaped molecule and a layered structure are displayed by the title compound, where the layers consist of high molecular weight polymers. A core molecule that is functionalized by six hydroxyl groups acts as the initiator for the ring-opening polymerization of ε-caprolactone, leading to a six-arm star polymer. The second layer of the dendritic block copolymer with 12, 24, or 48 hydroxyl groups (depending on the dendron generation in use) is obtained by the linkage of chain ends with functionalized dendrons. These macromoleculse act as “macroinitiators” for the construction of a further layer of poly(ε-caprolatone), the third generation of dendritic block copolymers. 相似文献