RSC Advances
·
2015
·Vol. 5
·期 23
·17601-17605
·
IF 3.84
Yueyue Tan,Wei Zhang,Yilong Gao,Jianxiang Wu,Bohejin Tang
Metal organic frameworks (MOFs), a kind of crystalline porous material, have attracted much attention due to their high surface area and controllable porous structure. In this paper, we present a new synthesis of Zr-based MOFs with high electrochemical performance by a facile synthetic method of changing the reaction temperature and stirring condition. By varying the reaction temperature, different particle sizes and degrees of crystallization can be obtained. This paper focuses on the electrochemical properties of Zr-based MOFs as electrode materials in supercapacitors. The maximum specific capacitance of Zr-MOF1 obtained at 50 °C can reach up to 1144 F g−1 at a scan rate of 5 mV s−1, which is far higher than Zr-MOF2 (811 F g−1), Zr-MOF3 (517 F g−1) and Zr-MOF4(207 F g−1). The results of electrochemical measurements show that the Zr-MOF1 we synthesized has excellent capacitance performance and good cycling stability over 2000 cycles, which makes it a promising supercapacitor electrode material.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Yan Yin,Yueyang Xu,Konglu Guo,Peng Zhang,Yongping Zeng
Adsorptive desulfurization is one of the alternative technologies for the effective removal of sulfides from fuels. Functionalization of metal-organic frameworks (MOFs) with Cu + is extremely desirable for adsorption separation via π-complexation interaction with adsorbed molecules. Here we report that Cu + cation is significant and highly effective for adsorption desulfurization in a new type of Cu + - modified UiO-66(Zr). First, Cu 2+ was introduced via ion-exchange with H + of UiO-66-SO 3 H. Then, Cu + cation was obtained from the reduction of Cu 2+ by using vapor-induced reduction, in which vapors of reducing agents diffuse into the pores of MOFs at a lower temperature. The resulted UiO-66-SO 3 Cu(I)− 0.15 has a better adsorption capacity for thiophene compared to pure UiO-66. In the presence of toluene, the UiO-66-SO 3 Cu(I)− 0.15 also exhibits high adsorption capacity for thiophene. After recycling four times, UiO-66-SO 3 Cu(I)− 0.15 still remains a high adsorption capacity.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Xiaochang Lin,Bo Sun,Pengsen Wang,Min Zhao,Dejia Liu,Qiyu Zhang,Baile Wu,Dezhao Liu
A magnetic Fe n UiO-66 adsorbent was created to achieve high phosphate adsorption capacity. The incorporation of Fe 3 O 4 facilitated the precipitation and growth of UiO-66 during crystallization, resulting in a shift towards a multilayer heterogeneous distribution of adsorption sites. The increased Fe 3 O 4 content notably enhanced the magnetic properties of Fe n UiO-66, while negligibly affecting its adsorption performance. The Fe 1.5 UiO-66 demonstrated exceptional phosphate adsorption capacity (136.54 mg/g), outstanding selectivity, and sustained reusability, with an 80% removal efficiency after nine cycles of treating actual water. The mechanism of phosphate adsorption by Fe n UiO-66 involved electrostatic attraction, ligand exchange, and linker exchange. Notably, while linker exchange significantly contributed to high adsorption capacity, it resulted in irreversible damage to the Fe n UiO-66 crystal. These unequivocal findings will serve as a solid foundation for further research and underline the critical role of linkers in the process of phosphate adsorption.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Honghuan Yin,Huaiwen Wang,Dongai Wang,Miaomiao Shi,Xi Xu,Jiaqi Yang
Developing low-cost and stable adsorbent is urgent and attractive to remove hazardous dye from water. In this study, zirconium based metal-organic framework (NH 2 -UiO-66) was grown on waste wool fibers and the fabricated composite adsorbent (NH 2 -UiO-66/wool) was used to remove anionic dye methyl orange (MO). After characterizing the adsorbents, we determined the effect of pH and initial concentration of MO on adsorption performance. Moreover, adsorption kinetics and isotherms were conducted to reveal the adsorption mechanism. The results showed that NH 2 -UiO-66/wool achieved the highest adsorption capacity at natural pH with the maximum adsorption of 61.0 mg/g adsorbent, which is higher than most biomass based adsorbents. Moreover, NH 2 -UiO-66/wool enabled a broad range of pH (3−11) and initial concentration of MO (10–50 mg/L). Adsorption kinetics and isotherms of NH 2 -UiO-66/wool fitted well with pseudo-second-order model and Langmuir mode, respectively. NH 2 -UiO-66/wool presented 40.3 times higher of kinetics constant than that of original wool in the presence of initial MO concentration of 10 mg/L due to the positive nature of NH 2 -UiO-66. Ultimately, NH 2 -UiO-66/wool presented excellent regeneration ability with 500 mg/L NaCl solution and regeneration efficiency remained 98% after 10 cycles. Overall, this work may provide new insights into the development of MOFs/wool adsorbents for enhanced dye removal.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 43
·24802-24810
·
IF 3.049
Xu Zhang,Yufan Zhang,Tiecheng Wang,Zheng Fan,Guoliang Zhang
A facile controlled interfacial polymerization strategy was proposed for the synthesis of novel thin film nanocomposite (TFN) membranes for enhanced nanofiltration performance. UiO-66 nanoparticles were aminated and pre-immobilized onto a polymer substrate via polydopamine (PDA) coating to achieve a continuous and defect-free polyamide dense layer. The mediation of the PDA coating could not only enhance the structural stability of TFN nanofiltration membranes, but also improve the dispersion and anchorage of UiO-66-NH2, thus closely fixing the position of UiO-66-NH2 nanoparticles on the polymer substrate. Moreover, since the amino group (–NH2) further reacted with PDA via Michael addition or Schiff base reaction, the in situ mutual reaction reduced the nanoparticle losses significantly during the draining off of the monomer solution in the fabrication process, which effectively cut down the actual dosage. The results showed that the PDA interlayer could induce the tight attachment of the PA layer to the support, enhancing the structural stability of TFN membranes. Furthermore, the dosage of UiO-66-NH2 in the as-prepared TFN membranes could also be decreased to as low as 0.01 w/v%, which was nearly a 10–20-fold reduction in the required amount of UiO-66-NH2 for the synthesis. The fabricated TFN/UiO-66-NH2 membranes exhibited very high water permeance and competitive salt rejections in cross-flow nanofiltration, which shows the huge potential for the application of novel TFN membranes with controlled nanoparticle incorporation in industrial separation.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of CO2 Utilization
·
2024
·
IF 7.2
Heming Deng,Haoshuang Gu
Two-dimensional membranes are considered the next generation separation membrane with great application potential due to their excellent separation performance, good mechanical strength and thermal stability compared with traditional membrane materials. In this work, the flexible NH 2 -UIO-66@MXene membrane was successfully prepared for gas separation by loading NH 2 -UIO-66 particles onto Ti 3 C 2 nanosheets based on an in-situ growth strategy. A LiF-HCl mixed solution was used as the etchant to obtain the Ti 3 C 2 nanosheets. The loading of NH 2 -UIO-66 particles can regulate the interlayer spacing of Ti 3 C 2 nanosheets, improving the specific surface area of Ti 3 C 2 and the adsorption capacity for specific gases. The -NH 2 group in NH 2 -UIO-66 enabled preferential adsorption of CO 2 over H 2 , and the CO 2 molecules adsorbed in the channel can even block the molecules passing through, increasing the resistance of CO 2 diffusion. As a result, the NH 2 -UIO-66@Ti 3 C 2 hybrid membrane realizes the selective separation of H 2 /CO 2 mixed gas, and the separation selectivity is as high as 155. The gas separation selectivity and permeation of the final prepared NH 2 -UIO-66@MXene were enhanced and exceeded the upper limit of Robeson upper bound (2017).
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Applied Materials Today
·
2021
·
IF 10.041
Minghao Ni,Ming Gong,Xiang Li,Jinlou Gu,Bo Li,Ye Chen
Metal-organic frameworks (MOFs) have attracted significant attention thanks to their excellent physical and chemical properties. Metal-organic frames are widely used in optics. For example, metal-organic frameworks can be used in fluorescent probes to detect and treat diseases, and can also be used to make solid-state light-emitting devices. Considering the high stability and easy synthesis of Zr-based UiO-66 MOF as well as the strong fluorescent emission of porphyrin molecules, the TCPP-incorporated UiO frameworks would inherit these advantages and exhibit intriguing optical performance. Therefore, in this paper, TCPP was doped into UiO-66, and the optical properties of the resulting MOF structure were observed. To obtain the optimal doping condition, three doping concentrations of TCPP were used. Besides the structural and morphological characterization by X-ray diffraction and scanning electron microscopy, more attentions have paid on the optical testing based on absorption and fluorescence spectroscopy, two-photon fluorescence spectroscopy and time-resolved spectroscopy. As a result, the TCPP-doped MOFs exhibited good fluorescence properties and satisfied our previous expectations of nonlinear optical properties and two-photon absorption. This work would pave a new way in constructing various MOFs-based solid-state devices with widespread optical applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Xinjia Zhang,Yanchao Li,Jianguo Mi,Xiuqing Kang,Junsu Jin
Atmospheric water adsorption at low humidity is considered to be a major challenge in solving global water problems. As a routine water adsorbent, the University of Oslo-66 (UiO-66) powder has been restricted by its limited low-pressure water absorption capacity, the need for powder molding, and insufficient adsorption rates. To overcome these problems, this work prepares E-UiO-66@PAA spherical composites by crystallizing UiO-66 on the surface of macroporous polyacrylate, i.e. PAA porous spheres, through in situ confined growth and ligand exchange strategies. The average size of the crystals has been reduced by 4 times vtihe nanoscale roughness of the polymer substrate surface and the interfacial enrichment of the precursor solution to lower the energy barriers of heterogeneous nucleation. In addition, the coordination of the hybrid ligand with Zr 4+ creates a unique cavity structure and gives rise to novel micropores as a result of ligand defects, which can be fitted into the lattice as binding sites for water. In the water vapor adsorption test at 298 K, E-UiO-66@PAA was able to operate at 4.9 times the capacity at low pressure (0.1 < P/P 0 < 0.2) and advanced the adsorption saturation time by 30.7% of the pristine UiO-66. Especially, the relative pressure of the sudden change in water vapor uptake was reduced from 0.3 to 0.1, which could greatly save the energy required for vapor regeneration and reduce its operating cost. This study provides an effective method to improve the adsorption capacity, mass transfer rate, and workability of composites by designing a nanoporous structure and confined growth nuclei as adsorption sites.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Jun Hu,Ye Cao,Lu Cai,Guanzheng Wu,Yuanyu Ge,Ling Lin,Ziyin Li
Metal-organic frameworks (MOFs) based proton conductors, as a promising alternative to proton exchange membranes, are in urgent need of developing effective methods to enhance their proton conductivity. Here, we report the enhanced and ultra-fast proton conduction facilitated by the post-covalent bonding of the flexible zwitterionic arm (sulfobetaine methacrylate: SBMA) with UiO-66. A new zwitterionic MOF based proton conductor (UiO-66-SB) exhibits the higher proton conductivity of 0.1 × 10 −2 S·cm −1 but with the activation energy ( E a ) of only 5.8 kJ/mol at 85 °C and 90 % RH, indicating ultra-fast proton transport. This result was attributed to the continuous and shorter hydrogen bonded network formed by flexible zwitterionic arms, water molecules, and residual –NH 2 . This work also demonstrates that zwitterions are highly advantageous as proton carrier media for the post-modification of MOFs.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Aisheng Huang,Linlin Wan,Jürgen Caro
In a detailed study, the influence of microwave irradiation, synthesis time and temperature, addition of acetic acid (HAc) as a modulator on the morphology, crystallinity and stability of UiO-66-NH 2 is investigated to develop a reliable and reproducible strategy for the preparation of well-shaped UiO-66-NH 2 . The UiO-66-NH 2 were characterized by powder X-ray diffraction (PXRD), field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA), and gas adsorption. It is found that well-shaped UiO-66-NH 2 with a high CO 2 adsorption capacity can be synthesized in a short time by microwave heating. The UiO-66-NH 2 crystals synthesized by microwave heating are of high quality and show a superior CO 2 adsorption capacity (5.8 mmol/g at 273k and 1 bar) due to the strong interactions between the −NH 2 group and CO 2 . The CO 2 /N 2 selectivity of the obtained UiO-66-NH 2 at 298 K and 1 bar is 66, which is much higher than that of the pristine UiO-66 of 17.8.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Konglu Guo,Yueyang Xu,Yan Yin,Yongping Zeng
Adsorption desulfurization can effectively remove thiophene-containing compounds in fuels. UiO-66 is a potential candidate for adsorption desulfurization due to the excellent chemical stability and resistances to acids and alkali. However, the adsorption capacity is relatively low for the big molecules of sulfide (such as thiophenes) because of the pore size in the microporous structure. We used Zn 4 O(BC) 6 as a template to synthesize a new π-complexation adsorbent (H-UiO-66-SO 3 Cu(I)) via ion-exchange and steam-induced reduction, with hierarchical porous (microporous and mesoporous) structure. The adsorbent was characterized by FT-IR, XRD , SEM , TEM and N 2 adsorption-desorption isotherms. The results show that H-UiO-66-SO 3 Cu(I) has the stable structural properties with the new mesopores . H-UiO-66-SO 3 Cu(I) has a good adsorption performance for thiophene and benzothiophene in the model fuel. The regeneration results show that H-UiO-66-SO 3 Cu(I) can be recycled four times and still has good adsorption performance.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2023
·Vol. 17
·期 10
·1389-1398
·
IF 4.5
Kou Zongliang,Sun Guanlun,Ding Qiuyan,Li Hong,Gao Xin,Fan Xiaolei,Ou Xiaoxia,Pan Qinhe
Hydrothermal and catalytic stability of UIO-66 MOFs with defective structures are critical aspects to be considered in their catalytic applications, especially under the conditions involving water, moisture and/or heat. Here, we report a facile strategy to introduce the macromolecular acid group to UIO-66 to improve the stability of the resulting UIO-66—PhSO 3 H MOF in aqueous phase catalysis. In detail, UIO-66—PhSO 3 H was obtained by grafting benzenesulfonic acid on the surface of the pristine UIO-66 to introduce the hydrophobicity, as well as the Brønsted acidity, then assessed using catalytic hydrolysis of cyclohexyl acetate (to cyclohexanol) in water. The introduction of hydrophobic molecules to UIO-66 could prevent the material from being attacked by hydroxyl polar molecules effectively, explaining its good structural stability during catalysis. UIO-66—PhSO 3 H promoted the conversion of cyclohexyl acetate at ca. 87%, and its activity and textural properties were basically intact after the cyclic stability tests. The facile modification strategy can improve the hydrothermal stability of UIO-66 significantly, which can expand its catalytic applications in aqueous systems.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）