金属有机骨架材料UiO-66的制备及表征

以氯化锆为金属盐,对苯二甲酸为有机配体,N,N-二甲基甲酰胺为有机溶剂,采用溶剂热法制备Ui O-66。通过考察金属盐、有机溶剂、有机配体、晶化温度、晶化时间的影响,确定出的优化合成条件为:n(金属盐)/n(有机配体)为1.0、n(有机溶剂)/n(有机配体)为25、晶化温度为100℃、晶化时间为25 h。在此条件下,可合成出相对结晶度较高的Ui O-66。     

PVA/UiO-66复合薄膜的制备及性能表征

采用溶剂热法合成出了金属有机骨架材料UiO-66,并通过流延法制备出了一系列PVA/UiO-66复合膜.通过红外光谱仪(FTIR)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)、接触角、溶胀度、拉伸强度和透光性等表征方法,详细研究了UiO-66含量对复合膜各种物性的影响.结果表明,PVA在经富马酸交联后,耐水溶胀性...     

MIL-68(Al)/PPSU混合基质膜的制备

以聚亚苯基砜(PPSU)为基膜材料、合成的铝基MOFs材料MIL-68(Al)为添加粒子,采用浸没沉淀相转化法制备了MOFs掺杂量不同的MIL-68(Al)/PPSU混合基质膜.对所制得的MIL-68(Al)进行表征,考察了 MIL-68(Al)不同的掺杂量对混合基质膜的微观形貌及分离性能的影响.结果表明,当加入质量分...     

金属有机骨架UiO-66在催化领域的应用

金属有机骨架（MOFs）经过二十多年的快速发展,已经合成了成千上万种,然而MOFs材料普遍具有较低的稳定性,在一定程度上限制了MOFs的发展。UiO-66的合成是MOFs材料稳定性的一个突破,其在催化领域的发展尤为迅速。本文首先介绍了理想及实际状态下UiO-66的结构特征,并说明了配体缺失导致的节点空位处的元素组成。然后综述了利用UiO-66特殊的结构特征或将其功能化用于催化反应的研究,包括节点空位、功能化节点空位、负载金属纳米颗粒、功能化配体等。最后,考虑到可以综合利用UiO-66的特殊结构,对UiO-66在未来多功能催化剂的设计合成领域所能发挥的作用进行展望。     

铸膜液配方对LSCF/PES混合基质膜分离选择性能的影响

将纳米镧锶钴铁(La0.6Sr0.4Co0.2Fe0.8O3)引入到聚醚砜铸膜液中,采用相转化法制备了镧锶钴铁/聚醚砜(LSCF/PES)混合基质膜,通过调节PES和LSCF的含量来提高膜性能。结果表明:当PES的含量为16%,LSCF的含量为3.2%时,膜的通量达到90.4 L/(m2h),在0.3 MPa和20℃的条件下,膜对氯化镁的截留率达到了25.8%。膜性能显著受LSCF的含量和纳米颗粒的聚集影响,通过调节铸膜液配方,有望将其应用于苦咸水脱盐。     

UiO-66/GO纳米复合材料的合成及其增强的吸附性能

以ZrCl4, 和H2BDC和GO为原料,采用溶剂热法 合成了一种新型的纳米 复合材料UiO-66/氧化石墨烯（UiO-66/GO）。运用扫描电镜（SEM）和透射电镜（TEM）分析了复合材料的表面形貌和复合状态,观察到UiO-66均匀生长在GO片上形成一种2D负载结构。采用X-射线衍射（XRD）和红外光谱（FTIR）对复合材料的晶体成分结构和成分进行分析,发现GO的添加不影响UiO-66的晶型体结构。N2吸附-解吸等温线分析了纳米复合材料的比表面积和孔径分布,表明含有2% 质量比GO用量2%的UiO-66/GO复合材料 具有最高的比表面积 （738 m2/g）。UiO-66/GO-2 的协同效应 使其对刚果红（CR）的去除率远高于UiO-66和GO的,其最大吸附量为561.79 mg/g,分别是相同条件下UiO-66和GO对CR吸附量的2.8倍和7.1倍。     

UiO-66(Zr)型改性膜在水处理中的研究进展

从制备方法、分离效果和分离机理等方面,简述了UiO-66(Zr)型改性膜在油水分离、染料去除、重金属离子去除和脱盐等领域中的应用,对UiO-66(Zr)型改性膜在水处理中的应用提出了展望。     

UiO-66的制备、功能化及膜分离研究进展

UiO-66是一种具有优异物理化学稳定性的金属有机骨架（MOFs）材料,近年来引起了研究者们的强烈关注。本文详细介绍了UiO-66的结构,重点探讨了溶剂热法过程中的一系列影响因素,包括使用不同的金属前体,改变合成温度、溶剂、各组分配比以及模板剂等,制备各种性能的UiO-66。针对溶剂热法合成效率较低的问题,介绍了微波合成法、微流控、连续流和无溶剂法等其它UiO-66的制备方法。为了扩大UiO-66的应用范围,对其有机配体进行功能化改性或与其他材料复合改性,具体介绍了改性后UiO-66在气体吸附、水处理、催化、电化学和化学传感等方面的应用。最后综述了利用UiO-66具有多孔特性构建分离膜方面的研究进展,具体阐述了纯UiO-66膜和UiO-66复合膜在气体分离和水处理方面的应用。     

UiO-66基催化剂的制备及其在CO甲烷化中的应用

煤制天然气技术具有良好的经济和环境效益,其中CO甲烷化是煤制天然气过程的重要环节之一。本研究以UiO-66材料为载体制备了一系列具有不同Ni负载量的Ni/UiO-66催化剂,采用XRD, BET, TG, SEM, TEM, XPS等表征方法对载体和催化剂的物相结构、织构性质、热稳定性和元素分布情况进行考察,并对各催化剂上CO加氢性能进行了考察。研究结果表明,Ni金属高度分散于UiO-66载体上,且对金属有机骨架材料的物相结构和晶体形貌无显著影响。在CO甲烷化反应过程中,随Ni负载量逐渐增加,各Ni/UiO-66催化剂的起活温度逐渐降低;在相同反应温度(320℃)下,不同催化剂上Ni负载量由10%增加到30%,其CO转化率由10.7%提升到89.7%;当Ni含量为20%时,催化剂在反应过程中具有良好的稳定性。同时,Ni基催化剂上CO转化率远高于具有相同金属负载量的Fe基和Co基催化剂,表明Ni作为活性金属在合成气制甲烷反应过程中具有优异的催化性能。     

UiO-66的合成、结构及应用进展

金属有机框架（MOFs）材料因其比表面积大、孔隙率高及孔道易调、易功能化等特点而应用于各研究领域。然而,多数MOFs材料的化学稳定性和水热稳定性较差,使其应用受到极大的限制。锆基MOFs材料UiO-66的骨架坍塌温度>500℃、可承受1.0 MPa的机械压力,并且具有超高稳定性,从而引起了广泛的关注。该文系统地介绍了UiO-66制备方法的研究进展,其中干凝胶转化法具有产品收率高、反应体积小及可连续生产等优点,更具优势;同时详细介绍了有机配体、金属节点和掺杂等改性方式对UiO-66结构的影响,总结了UiO-66在催化、气体储存和分离、药物输送等方面的应用;最后,对UiO-66的未来发展方向进行了展望。     

Efficient CO2 Separation Using a PIM-PI-Functionalized UiO-66 MOF Incorporated Mixed Matrix Membrane in a PIM-PI-1 Polymer

Metal–organic framework (MOF) incorporated mixed–matrix membranes (MMMs) attract great interest for gas separation applications because they overcome limitations faced by typical polymer membranes, including permeability–selectivity trade-off, aging effect, and plasticization phenomenon. However, optimal MOF–polymer interface compatibility is the key challenge in fabricating defect-free high-performance gas-separation MMMs. Here, a surface modification strategy of the UiO-66-NH₂ MOF using a covalently bound PIM-PI-oligomer is developed to engineer interface compatibility with the polymer that has an identical chemical structure (PIM-PI-1) in the MMMs. A series of MMMs are prepared with different loadings of homogeneously distributed PIM-PI-functionalized MOFs (PPM). Significant improvements in CO₂/N₂ and CO₂/CH₄ selectivity and permeability are achieved with these MMMs, ranging from 5 to 10 wt% of the PPM loadings. The MMM with 10 wt% loading (PPM-10@MMM) shows a CO₂ permeability of 3827.3 Barrer and a CO₂/N₂ and CO₂/CH₄ selectivity of 24 and 13.4, respectively. This surpasses the 2008 Robeson upper bound for CO₂/N₂ and is very close to the 2008 upper bound for CO₂/CH₄. The experimental results are further compared using Maxwell's equation for MMMs. The resulting MMMs show a plasticization resistance against CO₂ up to 25 atm pressure and anti-aging performance for 180 h.     

PANI/N-K2Ti4O9/UiO-66复合材料的制备及光催化性能研究

用自组装法将金属有机框架UiO-66负载到低带隙半导体N-K2Ti4O9的表面,然后采用原位氧化复合法制备导电聚合物聚苯胺粘结的PANI/N-K2Ti4O9/UiO-66复合光催化剂（复合材料A）,制备了N-K2Ti4O9和UiO-66不同比例物理混合后再粘结聚苯胺的复合材料B.采用红外（IR）、场发射透射电镜（FETEM）、荧光光谱（PL）对复合材料的结构、形貌进行表征.结果表明,UiO-66负载到棒状N-K2Ti4O9的表面呈现核壳结构,聚苯胺（PANI）粘结在核壳结构N-K2Ti4O9/UiO-66的表面形成复合材料,PANI粘结可以有效降低电子-空穴复合率,复合材料A具有最好的光催化性能.     

Adsorption Behavior of Rhodamine B on UiO-66 Adsorption Behavior of Rhodamine B on UiO-66

The adsorption characteristics of UiO-66 (a Zr-containing metal–organic framework formed by terephthalate) for Rhodamine B (RhB), such as isotherms, kinetics and thermodynamics, were investigated syste...     

Fabrication of in-situ polymerized UiO-66/PVDF supramolecular membranes with high anti-fouling performance

The composite membrane with the advantages of high separation efficiency and wide application, has been widely concerned in the field of water purification and molecular separation. However, the common composite membrane cannot achieve continuity, or the grafting process is complex, which significantly hinders its further development. In this work, the in-situ polymerization of UiO-66/PVDF supramolecular flat membranes as the continuous and high-performance composite membrane can be easily synthesized using the supramolecular force, (such as, hydrogen bond, etc.). These supramolecular membranes exhibit good hydrophilic (61°) and anti-fouling performance for bovine serum albumin (BSA) solution with rejection rate 97.79% than the original membrane. Moreover, this membrane can achieve more MOF doping based on maintaining the membrane performance, which undoubtedly greatly improves its hydrophilicity and mechanical properties. In addition, we also characterized the porous microstructure of the UiO-66/PVDF supramolecular membrane to analyze the influence of different doping amounts on the membrane structure. This supramolecular membrane has the advantages of simple synthesis, good hydrophilicity and water separation performance, which provides a more convenient and effective way for the preparation of MOFs/polymer flat membrane, and also provides a new method and new idea for expanding the application of MOFs/polymer ultrafiltration membrane in water treatment.     

The adsorptive properties of UiO-66 towards organic dyes: A record adsorption capacity for the anionic dye Alizarin Red S.

In order to decisively determine the adsorption selectivity of zirconium MOF(UiO-66) towards anionic versus cationic species, the adsorptive removal of the anionic dyes(Alizarin Red S.(ARS), Eosin(E), Fuchsin Acid(FA)and Methyl Orange(MO)) and the cationic dyes(Neutral Red(NR), Fuchsin Basic(FB), Methylene Blue(MB),and Safranine T(ST)) has been evaluated. The results clearly reveal a significant selectivity towards anionic dyes. Such an observation agrees with a plethora of reports of UiO-66 superior affinity towards other anionic species(Floride, PO_4~(3-), Diclofenac sodium, Methylchlorophenoxy-propionic acid, Phenols, CrO_4~(2-), SeO_3~(2-), and AsO_4~-). The adsorption process of ARS as an example has been optimized using the central composite design(CCD). The resultant statistical model indicates a crucial effect of both pH and sorbent mass. The optimum conditions were determined to be initial dye concentration 11.82 mg.L~(-1), adsorbent amount 0.0248 g, shaking time of 36 min and pH 2. The adsorption process proceeds via pseudo-second order kinetics(R~2= 0.999). The equilibrium data were fit to Langmuir and Tempkin models(R~2= 0.999 and 0.997 respectively). The results reveal an exceptional removal for the anionic dye(Alizarin Red S.) with a record adsorption capacity of400 mg·g~(-1). The significantly high adsorption capacity of UiO-66 towards ARS adds further evidence to the recently reported exceptional performance of MOFs in pollutants removal from water.