CATALYSIS LETTERS
·
2024
·
IF 2.3
Zhao Chunzhi,Mao Dongsen,Meng Tao,Guo Qiangsheng,Yu Jun
Owing to the intrinsic nature of the uniformed topologies and ultrasmall Zr 6 nodes of Zr-MOFs, herein, we employed Zr-MOFs (UiO-66 and UiO-67), as opposed to the support of traditional ZrO 2 , to prepare the Pd catalysts for toluene degradation. Compared with the catalysts of Pd/UiO-66 and Pd/ZrO 2 , Pd/UiO-67 catalyst boosted an excellence catalytic performance for toluene degradation, giving the lowest T 90% value of 235 °C with long-term stability. With the assisting of the cavity confinement of Zr-MOFs, Pd nanoparticles are prone to be encapsulated in the 3D frameworks of Zr-MOFs, and the bigger micropores of UiO-67 are more conducive to the formation of larger Pd nanoparticles. The in situ FT-IR results further declared that although the active sites are partly sacrificed due to the larger Pd nanoparticles formed in UiO-67, the stable adsorbed toluene on Pd/UiO-67 boosted the quick degradation of toluene in the reaction interval even without undergoing intermediate processes of benzoate and benzaldehyde. Graphical Abstract UiO-66, UiO-67 and ZrO 2 were employed to prepare the Pd catalysts for toluene degradation, Pd/UiO-67 catalyst boosted an excellence catalytic performance with long-term stability.
研究领域:
催化化学
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环境科学
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材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Jialing Shen,Guojun Lv,Juan Deng,Shihao Su,Fuxin Wang,Shengnan Xu,Lachgar Oussama,Zhongmin Liu
UiO-66 materials have the benefit of excellent stability, porosity, huge surface area, and presence of flaws, hence designing oxidative desulfurization (ODS) catalysts based on UiO-66 is very appealing. Herein, tungsten doped UiO-66 materials were synthesized with post-doping and in situ synthesis methods, and used as heterogeneous catalysts for the room-temperature oxidative desulfurization reactions. The successful doping of tungsten into the UiO-66 framework was demonstrated by FT-IR, UV–Vis, Raman and TGA characterizations. XAS characterization disclosed that tungsten element formed Zr-O-W bond on the defect sites for the tungsten doped UiO-66 materials. At the same time, the in situ synthesized W 2 @U-150 catalyst revealed the highest 98.5% of dibenzothiophene (DBT) elimination within 1h of desulfurization reaction as well as the biggest catalytic efficiency of 17727.3 h −1 mol −1 at room temperature due to its smallest band gap energy of 3.32 eV, highest tungsten content of 9.8 %, and most Lewis acid amount of 47.1 μmol/g. In addition, the synthesized W 2 @U-150 catalyst showed excellent re-usability for five cycles.
研究领域:
材料科学
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催化化学
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环境化学
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产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2017
·
IF 4.055
Yitong Han,Min Liu,Keyan Li,Qiao Sun,Chunshan Song,Guoliang Zhang,Zongchao Zhang,Xinwen Guo
Controlled synthesis of metal–organic frameworks (MOFs) in nanometer scale is highly desired for the optimization of properties and the extending of applications. In this work, Cu2O was used as additive for the first time in the synthesis of zirconium-based MOF UiO-66. We found that the amount of Cu2O additive had an important impact on downsizing the crystal size of UiO-66. Cu2O additive plays a role of rate controller of crystal growth of UiO-66 crystals by their competitive coordination behavior with the linker H2BDC between the [Zr–O] clusters. This generates a depleted H2BDC concentration for the coordination with the [Zr–O] clusters for constructing the UiO-66 framework, which favors the production of small crystals. As a result, well-dispersed nanometer scale UiO-66 crystals with mean crystal size of 40 nm can be easily synthesized by the addition of Cu2O. The as-synthesized nanometer scale UiO-66 crystals have a pure crystal structure with high crystallinity and superior porosity.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Xingxing Mao,Yanyang Wu,Xiaocheng Zhang,Yunqi Cai,Bin Wu,Kui Chen,Lijun Ji
The adsorption performances of durene (DR) and prehnitene (PR) (molar ratio of 1:1) by MIL-53(Cr), UiO-66, ZIF-8 and Cu-BTC at 298.15 K were evaluated by adsorption experiments and simulation with Grand-canonical Monte Carlo method . UiO-66 exhibited the highest selectivity for DR and PR. Thus UiO-66 was selected and taken as the adsorbent subsequently. The adsorption kinetics and thermodynamics of DR and PR were studied in detail. Studies on kinetics showed that the data could be correlated well by the pseudo-second-order kinetic mode. The adsorption isotherms conformed to the Langmuir isotherm. The adsorption processes were spontaneous and exothermic. The adsorption capacity of DR was lower than that of PR according to the single component adsorption, while it showed the opposite trend in the competitive adsorption. The selectivity of DR and PR could reach 2.60 at 298.15 K. In conclusion, UiO-66 can be a feasible adsorbent to separate DR and PR for industrial application.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS TODAY
·
2022
·
IF 6.562
Li Tan,Yanru Li,Qian Lv,Yuyan Gan,Yuan Fang,Yu Tang,Lizhi Wu,Yuanxing Fang
The conversion of CO 2 to valuable chemicals by photocatalysis has attracted widespread interesting. Owing to the linear structure of CO 2 molecule with strong C O bond, the surface reaction is considered as one of the main issues to restrict the conversion efficiency. Herein, soluble UiO-66 has been developed as co-catalyst to enhance the photocatalytic performance for CO 2 reduction. The soluble UiO-66 has presented the performance ca. 1.5 higher than the insoluble version, yielding 30.6 µmol/h for CO 2 to CO conversion by using 5.0 mg sample. This improvement can be attributed to the preserved framework by soluble UiO-66. Therefore, the chemisorption of CO 2 molecules can be improved, boosting the reduction reaction for CO production. This research provides a new path for a rational design of metal-organic framework (MOF) for photoredox catalysis, meanwhile inspiring advanced application of MOF catalysis with the soluble manner.
研究领域:
化学
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材料科学
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环境科学
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产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 2
·1-18
·
IF 2.4
Xu Lingling,Pan Xiaomei,Gao Lijing,Wei Ruiping,Li Jihang,Wen Xiu,Li Yuanzhuang,Xiao Guomin
UiO–66–NH 2 (Ti/Zr) modified by Ti metal oxide (TiO 2 ) was used to catalyze the hydrolysis of cellulose to prepare 5-HMF. Under the optimal reaction conditions of H 2 O(NaCl)/THF(1/4 mL), 190 °C, 2 h and 50 mg UNT-3(Ti/Zr) (TiO 2 and UiO–66–NH 2 with mass of 1.5 and 0.1 g, respectively), the yield of 5-hydroxymethylfurfural reached 59.88%. UiO–66–NH 2 (Ti/Zr) nanocomposites with different mass ratios were successfully prepared by simple solvent evaporation method. SEM and TEM have shown that the modified UiO–66–NH 2 (Ti/Zr) are wrapped into sphere by TiO 2 densely attached to the surface of UiO–66–NH 2 , which provides favorable conditions for the uniform dispersion of TiO 2 and coordination of the Lewis acidic site of UiO–66–NH 2 . NH 3 –TPD results confirmed the existence of super-strong, strong, middle and weak acid sites in UiO–66–NH 2 (Ti/Zr), and Py-FTIR confirmed the existence of Brønsted and Lewis acids. After four cycles, the yield of 5-HMF and FUR decreased slightly from 59.88 to 51.89% and 9.11 to 7.66%, respectively, and the yield of 5-HMF could still remain above 50%. The results showed that the modified composite treatment of TiO 2 with rich Lewis acid/base and UiO–66–NH 2 could provide a certain idea for the extensive application of biomass research in the future. Graphic
研究领域:
材料科学
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催化化学
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生物质能研究
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产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Di Zhang,Hao Tang,Bing Zhao,Lijie Liu,Hongwei Pang,Xiangxue Wang,Shujun Yu
Radioactive uranium removal plays a key role in energy development and environmental security. Sulfide nanoscale zero-valent iron (S-NZVI) has good antioxidant capacity, dispersibility and activity to eliminate U(VI) from wastewater, but the removal efficiency is limited. To improve the reduction and adsorption capacity of S-NZVI, through treating Fe 3+ solution by nitro-functionalized UiO-66 (UiO-66-NO 2 ) with high porosity, UiO-66-NO 2 enhanced S-NZVI adsorbent (S-NZVI/UiO-66) was prepared by liquid phase reduction method. The smaller size and larger specific surface area of S-NZVI/UiO-66 were confirmed by a variety of characterization techniques. Based on the excellent surface structure and reactivity, the U(VI) removal capacity of S-NZVI/UiO-66 (895 mg g −1 ) was much better than S-NZVI (434 mg g −1 ) and UiO-66-NO 2 (267 mg g −1 ). The impacts of pH, background ion strength, coexisting ions and different water environments on adsorption were studied via macroscopic batch experiments. The results showed that S-NZVI/UiO-66 could remove U(VI) adequately in a wide pH range. The removal rate was basically not affected by the concentration of NaNO 3 , demonstrating that the adsorption process of U(VI) on S-NZVI/UiO-66 tended to inner surface complexation. From XPS technique combined with the results of batch adsorption experiments, it was clear that the elimination mechanisms of U(VI) by S-NZVI/UiO-66 were mainly the physical adsorption, electrostatic attraction and complexation of UiO-66-NO 2 , and the reduction and complexation of S-NZVI. Therefore, it is believed that S-NZVI/UiO-66 has a great potential to be an excellent adsorbent in the field of the environment remediation. Moreover, S-NZVI/UiO-66 promises to be a novel nanomaterial for solving the problem of radionuclide contamination in practical environments.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 6
·期 5
·3671-3679
·
IF 3.84
Aoning Wang,Yingjie Zhou,Zhoulu Wang,Miao Chen,Luyi Sun,Xiang Liu
A UiO-66-type metal–organic framework (MOF) fabricated with titanium was successfully prepared via a facial modified post-grafting method. The as-prepared samples were characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), ultraviolet-visible adsorption spectroscopy (UV-vis), and photoluminescence spectroscopy (PL) techniques. The introduction of titanium enhanced the optical properties of UiO-66 via the formation of oxo-bridged hetero-Zr–Ti clusters, but led to a sacrifice in crystallinity. The removal of methylene blue (MB) over these samples could be attributed to the dual function of the adsorption and photo-degradation mechanisms. The highest MB removal efficiency of 87.1% was achieved over UiO-66(1.25Ti) under simulated sun-light irradiation.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2013
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IF 3.548
Qiang Zhao,Wen Yuan,Jianming Liang,Jinping Li
Metal−organic framework UiO-66 has high chemical and thermal stability. However, it is difficult to produce such Zr-based MOFs with good crystalline morphology. Here, highly pure metal−organic framework UiO-66 has been synthesized at low temperature (50 °C). The as-synthesized sample has been characterized by X-ray diffraction, thermogravimetric analysis , nitrogen adsorption , and scanning electron microscopy. Its hydrogen-storage capacity has been measured by means of an Intelligent Gravimetric Analyser. The results showed that UiO-66 was synthesized in octahedral crystals of well-defined sizes (150−200 nm) and had a high specific surface area (1358 m 2 /g). The as-synthesized UiO-66 showed a significant hydrogen uptake even at a moderate pressure, which increased to 3.35 wt% at 77 K and 1.8 MPa. A grand canonical Monte Carlo simulation (GCMC) has been employed to calculate the adsorption of hydrogen in UiO-66. The result of this simulation provided a theoretical foundation for the experimental results.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Jing-ran Yu,Pan-pan Zhang,Jia-yu Ding,Yue-bin Liu,Wei-hai Lin,Wei Shao,Jia-jia He,Qihan Gong,Ming Xue
The separation of high-octane dibranched alkanes from naphtha is critical in the refining of gasoline. To date, research on the membrane-based separation of alkane isomers has been limited, with a particular paucity of investigations into mixed-matrix membranes. Herein, the continuous and dense UiO-66/PIM-1 mixed-matrix membrane, which was prepared through precise control of the interfacial structure, was first applied to the differentiation of C6 alkane isomers. Due to the synergistic combination of UiO-66 with differential adsorption capabilities for alkanes and PIM-1 that possesses a cross-linkable structure, the resulting UiO-66/PIM-1-(20) membrane demonstrated remarkable separation performance and high stability. Pervaporation measurements showed that the mass fraction of 2,2-dimethylbutane in the feed side was increased from 50.0 to 75.8 wt % while an excellent flux of 1700 g m–2 h–1 was maintained over a continuous 40 h period. The UiO-66/PIM-1-(20) membrane, characterized by its facile replication and processing, shows potential for large-scale fabrication. This study offers a new approach to the membrane separation of alkane isomers.
研究领域:
化学工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 7
·1839-1849
·
IF 3.146
Zhang Xiaoting,Zhang Shusheng,Ouyang Gangfeng,Han Runping
A zirconium-based metal organic framework (UiO-66-NH 2 ) was prepared using a greener approach for the removal of hexavalent chromium (Cr(VI)) from solution. The characterization of UiO-66-NH 2 was performed using several methods, and the influence of the solution pH, adsorbent dosage, salt, adsorption time, Cr(VI) concentration and adsorption temperature on adsorption quantity was performed in batch mode. UiO-66-NH 2 can efficiently remove Cr(VI) through the synergistic effect of adsorption and reduction. At pH solution of 1.1 and solid-to-liquid ratio of 2 g·L −1 , the removal rate of 100 mg·L −1 Cr(VI) increased to 95.2%. The maximum adsorption capacity of UiO-66-NH 2 from Langmuir model was 252 mg·g −1 . The adsorption equilibrium process can be well described by Langmuir, Koble-Corrigan and Temkin models, while the kinetic process can be predicted by pseudo-second-order and Elovich model. UiO-66-NH 2 showed a good adsorption capacity in a wide range of pH (pH=1.1–10) and also had better regeneration performance after five cycles using 0.01 mol·L −1 NaOH; consequently, it can be a promising adsorbent for the removal of Cr(VI) from solution.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Pengfei Yang,Xiaozhe Hu,Jin Zhou,Haixiang Li,Asfandyar Shahab,Liangquan Lu,Hua Zhang
Given the severe threat posed by heavy metal pollution to both the ecological environment and human health, the development of green, efficient and sustainable adsorbents has become a major research focus. Herein, a novel heavy metal ions adsorbent (De-UiO-66-IDSA) was synthesized by functionalizing defect UiO-66 with the biodegradable chelating agent iminodisuccinic acid (IDSA). The effects of different factors on the adsorption of Pb 2+ , Cu 2+ and Cd 2+ by UiO-66-IDSA were investigated, including IDSA loading, contact time, adsorbent dosage and pH. Batch adsorption experiments showed that the adsorption kinetics followed PSO model, while the isotherm data were best described by the Langmuir model, indicating a monolayer chemisorption process. The maximum adsorption capacities for Pb 2+ , Cu 2+ and Cd 2+ were 377.40, 163.60, and 204.10 mg/g at 298 K, respectively and the adsorption was spontaneous and endothermic. Moreover, regeneration experiments demonstrated that the adsorbent retained over 75 % of its removal efficiency for all three metal ions after 5 cycles. These results highlight the great potential of De-UiO-66-IDSA as a green, high-performance, and a regenerable adsorbent capable of effectively eliminating heavy metal ions from aqueous media.
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
危险品化学品经营许可证（带存储）