INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Shenyi Tang,Chenglian Luo,Zhi Wang,Xinlei Liu
A defect-free and stable metal–organic framework (MOF) membrane is a promising candidate for the separation of methanol/methyl tertiary butyl ether (MeOH/MTBE) mixtures. In this work, a structural-integrity and low-thickness (∼400 nm) UiO-66 membrane was fabricated by regulating the metal ion/ligand molar ratio in the synthesis solution and optimizing the preparation process using the secondary growth method with safer and more environment-friendly Zr(n-OPr)4 metal source. Based on the effective pore size and inherent amphiphilic structure of UiO-66, the membrane exhibits exceptional pervaporation (PV) performance. For the separation of MeOH/MTBE (5:95 wt/wt %) mixtures, the membrane displays an outstanding separation performance with an average separation factor of 2.23 × 104 and an average total flux of 3.61 kg·m–2·h–1 at 40 °C, which is superior to most membranes reported for the PV separation of MeOH/MTBE mixtures. In addition, a 72 h PV process was used to further confirm the structural stability of the membrane.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 20
·5605-5625
·
IF 5.726
Yan Cui,Leilei Xu,Mindong Chen,Xinbo Lian,Cai-e Wu,Bo Yang,Zhichao Miao,Fagen Wang,Xun Hu
A series of mesoporous nanocrystalline Ce–Zr solid solutions with different Ce/Zr ratios were successfully synthesized by the evaporation-induced self-assembly strategy, and were employed as catalytic supports of CuO-based catalysts for CO oxidation. These supports and catalysts were systematically characterized by X-ray powder diffraction (XRD), N2 physisorption, transmission electron microscopy (TEM), energy-dispersed spectroscopy (EDS) mapping, X-ray photoelectron spectroscopy (XPS), H2 temperature programmed reduction (H2-TPR), CO2 temperature programmed desorption (CO2-TPD), etc. The catalytic performances toward CO oxidation had been carefully evaluated over these CuO-based catalysts. The effects of various influencing factors, such as the Ce/Zr ratio, mesostructure, redox properties of the support, CuO loading amount and calcination temperature, on the low-temperature catalytic activity had been carefully investigated. The results showed that the catalyst supported on the support with a Ce/Zr ratio of 80/20 exhibited the highest catalytic activity. It was also found that the Ce–Zr solid solution mesoporous catalysts exhibited much higher catalytic activity than the counterparts without evident mesostructure, demonstrating the advantages of the mesoporous catalysts by providing more accessible catalytically active sites. Besides, the mesoporous Ce–Zr solid solution-supported catalysts with excellent redox properties displayed much better catalytic performances than the commercial γ-Al2O3-supported catalyst. The kinetic study also indicated that the apparent activation energy of the CO oxidation process was greatly affected by the Ce/Zr ratio, mesostructure, and redox properties of the support. Overall, the present CuO-based catalysts with mesoporous nanocrystalline Ce–Zr solid solutions as supports were considered as a series of promising catalysts for CO oxidation.
研究领域:
催化
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材料科学
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化学工程
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环境科学
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Xiaoting Zhang,Ying Li,Lei Zhang
Dyes detection remains a serious task because of their high toxicity. In present work, designed Eu 3+ functionalized Zr-metal-organic framework (Eu 3+ @Zr-MOF-808) as fluorescent probe was constructed via post-synthetic modification (PSM) for rapid monitoring four most commonly used dyes (malachite green (MG), brilliant green (BG), alizarin red S (ARS), indigo red (IDR)). Systematic exploring on the sensing mechanism reveals that fluorescence resonance energy transfer (FRET) for BG, MG and IDR and inner filter effect (IFE) for ARS contribute to the realization of the fluorescence quenching process. It exhibits excellent sensing performances with low limit of detection (LOD) of 32, 58, 77 and 133 nM for BG, IDR, MG and ARS, respectively. The as-constructed Eu 3+ @Zr-MOF-808 was demonstrated to be a highly sensitive probe for screening of MG in fish pond and IDR in printing wastewater with satisfying results. Moreover, a portable test reagent bottle has been developed for visual on-site screening of sample containing dyes with naked eyes under UV light. This is the first attempt to construct the Eu 3+ @Zr-MOF-808 probe for sensing multiple dyes in real samples and demonstrates promising applications in water quality monitoring.
研究领域:
环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
Journal of Applied Spectroscopy
·
2025
·
IF 1
Han Dan,Niu Xiaoxue,Wang Jing,Yan Zihong
Zr and Cl double-doped carbon dots (Zr/Cl-CDs) were prepared by a one-step hydrothermal method using citric acid, urea, and ZrCl 4 as precursors. Zr/Cl-CDs were characterized by ultra-violet-visible spectroscopy (UV-Vis), transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy (XPS). Experimental analysis revealed that the average size of Zr/Cl-CDs was 2–3 nm, while XPS analysis revealed the presence of C–Cl and Zr–O bonds. The fluorescence quantum yield of the final CDs was 17.5% at the excitation of 360 nm. In addition, Zr/Cl-CDs exhibited excellent performance in the detection of rutin with a concentration of 30–110 and 100–160 μmol/L, respectively. Linear correlation coefficients (R 2 ) were 0.9931 and 0.9962. The underlying mechanism was that rutin had an excellent quenching effect on the emission of the Zr/Cl-CDs as the fluorescence intensity exhibited a good linear relationship between rutin concentration and fluorescence intensity. These findings provide a new strategy for synthesizing double-doped CDs for rutin detection.
研究领域:
材料科学
·
分析化学
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DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2018
·
IF 3.463
Qinqin Wang,Mingyuan Zhu,Haiyang Zhang,Caixia Xu,Bin Dai,Jinli Zhang
Zr-modified ZSM-5 zeolite was successfully prepared, and Zn/Zr-ZSM-5 was employed as a catalyst for the acetylene hydration reaction. High catalytic activity, above 96% C 2 H 2 conversion, was achieved at 260 °C with a feed reactant ratio of H 2 O/C 2 H 4 = 4 and a GHSV of 90 h −1 . To understand the influence of zirconium addition in the zeolite, Fourier-transform infrared spectroscopy, X-ray diffraction, surface texture analysis (BET method), transmission electron microscopy, temperature programmed desorption of NH 3 , temperature programmed reduction by hydrogen and X-ray photoelectron spectroscopy techniques were used. The incorporation of zirconium in the zeolite enhanced Zn metal dispersion and metal–support interactions. Moreover, an enhanced concentration of weak acid sites and active catalytic sites were found to be responsible for the high catalytic activity of Zn/Zr-ZSM-5 for the acetylene hydration.
研究领域:
催化化学
·
材料科学
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产品关联
DOI
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 4.446
Jiacong Wu,Yi Wang,Juan Han,Lei Wang,Chunmei Li,Yanli Mao,Yun Wang
In this work, a mesoporous Zr-based MOF (MP-UIO-66) was first synthesized by biomineralization method using dextran as template and the resultant particles were applied in the immobilization of cellulase . Compared with conventional UIO-66, MP-UIO-66 has more mesoporous channels (4.6 nm) that allow cellulase (3.4 * 12.4 nm) to be entrapped into the channels, improving loading capacity and stability of immobilized enzyme . Specifically, the results showed that MP-UIO-66 had an excellent loading capacity (265 mg g −1 ) for cellulase, and the residual enzyme activity of PVP-cellulase@MP-UIO-66 (PCMU) was still about 83% after 6 cycles. Moreover, the suitable pore structure exposes the active center of cellulase to the external environment, which facilitates the mass transfer of the substrate. Based on Michaelis-Menten constant analysis, the substrate affinity (13.355 mg mL −1 ) and catalytic efficiency (1.311 mL mg −1 min −1 ) of PCMU were better than those of free cellulase (14.525 mg mL −1 , 0.732 mL mg −1 min −1 ).
研究领域:
生物化学
·
材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jie Chen,Jianzhong Ma,Qianqian Fan,Wenbo Zhang,Ruyue Guo
The development of chrome-free tanning agents is of great significance for the green and sustainable improvement of the leather industry. Metal organic framework (MOFs) is a kind of nanomaterial with steady framework formed by the coordination of metal clusters with organic ligands, which gives it a natural self-masking structure. Herein, two kinds of bimetallic MOFs were obtained via post-synthesis modification and used in the tanning to produce leather with good hydrothermal stability. M n+ - replacing Zr-MOFs is denoted as Zr/M−MOFs (M n+ = Ti 4+ , Al 3+ ). Zr/M−MOFs were characterized by XRD, SEM, FT-IR, TG, XPS, and N 2 adsorption/desorption. The results indicate that M n+ - replacing provides more active site that can be combined with collagen fibers. Compared to the Zr-MOFs tanned leather (75.3 °C), the shrinkage temperature of Zr/M−MOFs tanned leather (79.9 °C) has been further improved. In addition, Zr/M−MOFs can also avoid the problems caused by traditional metal tanning, such as the worse washability of aluminum tanning. A new strategy to improve the tanning performance of MOFs-based tanning agents was provided. It gives a new approach to the development of chrome-free tanning agents.
研究领域:
材料科学
·
皮革化学与工程
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环境科学
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产品关联
DOI
高影响因子
ACS Omega
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2017
·
IF 0
Tingting Yang,Hu Li,Jian He,Yanxiu Liu,Wenfeng Zhao,Zhongwei Wang,Xiaoxiao Ji,Song Yang
γ-Valerolactone (GVL) is one of the versatile platform molecules and biofuel additives derived from the lignocellulosic biomass. Herein, the efficient synthesis of GVL from biobased ethyl levulinate (EL) using alcohol as both H-donor and solvent without an external hydrogen source has been achieved over porous Ti/Zr microspheres. The catalysts (TixZry) with different Ti/Zr molar ratios were synthesized using hexadecylamine (HDA) as a structure-directing agent via a sol–gel process combined with solvothermal treatment and characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, thermal gravimetric analysis, NH3/CO2-TPD, N2 adsorption–desorption, and pyridine-IR. A high GVL yield of 90.1% at 100% EL conversion was obtained at 180 °C for 6 h over Ti2Zr8 in 2-propanol. The microspheric and porous structure, enhanced surface areas, and acid/base contents by the proper introduction of Ti species into Zr oxide were demonstrated to be responsible for the pronounced performance. The microspheric Ti2Zr8 porous catalyst could be reused at least six times with no decrease in catalytic activity.
研究领域:
催化化学
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生物质转化
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材料科学
✓ 已验证
DOI
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Yuanyuan Tian,Hui Wang,Shengli Liu,Bo Zhang
Zirconium (Zr)-doped NiO films with different contents were successfully synthesized via the chemical spray pyrolysis technique. The structure, morphology, optical and electrochemical behaviors of these films were investigated by X-ray diffraction (XRD), Raman spectrometer, scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), UV–Vis-NIR spectrophotometry, cyclic voltammetry (CV), and chronoamperometry (CA). XRD results suggested that the synthesized samples have the cubic crystal structure and a preferred orientation along the plane (111). Raman spectra further confirmed the successful incorporation of zirconium ions into the NiO films. SEM images explained that the surfaces of the doped films were composed of uniform and dense nanoparticles. EDS analysis suggested that Zr, Ni and O elements were uniformly distributed on the films. The optical results showed that the band gap decreases from 3.53 eV to 3.47 eV as the increase of zirconium doping content. The electrochemical analysis suggested that zirconium doping improved the specific capacitance of the NiO films (the NiO film with the Zr amount of 7 %, 59 F/g at 6 mV/s). In addition, the NiO film with 5 % Zr doped amount exhibited the largest Δ OD (81 %), the largest CE (60.37 cm 2 /C), and the fastest coloring time ( t c =2.1 s) and bleaching time ( t b = 2.4 s). These results showed that this film had the excellent electrochromic properties, suggesting that the optimal Zr doped amount of NiO films is 5 %. As a novel kind of electrochromic material, the Zr-doped NiO film has broad application prospects in smart windows, green buildings and energy efficient utilization fields.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2016
·Vol. 6
·期 14
·5543-5553
·
IF 5.287
Xin Zhao,Lei Huang,Supawadee Namuangruk,Hang Hu,Xiaonan Hu,Liyi Shi,Dengsong Zhang
A novel Zr–CeVO4/TiO2 catalyst was developed for the selective catalytic reduction (SCR) of NO with NH3. Both TiO2 nanosheets (TiO2-NS) and nanoparticles (TiO2-NP) with different crystal facets were used as supports for the catalyst. It was found that the TiO2-NS-supported catalyst showed much better activity, stability and H2O/SO2 durability than the TiO2-NP-supported catalyst. In particular, the catalyst loading amount was much lower than those of previously reported vanadate-based SCR catalysts. The crystal structures and morphologies were analysed by X-ray diffraction (XRD), Raman spectroscopy and (high-resolution) transmission electron microscopy ((HR)TEM). The redox properties, surface active species and acid sites of the catalysts were investigated through hydrogen temperature-programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), ammonia and nitrogen oxide temperature-programmed desorption (NH3-TPD and NOx-TPD) and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTs) experiments. The improved activity at lower temperature was due to the presence of more active oxygen species and Brønsted acid sites, as well as the formation of NO2 on the surface of the TiO2 nanosheets which have exposed (001) facets. The enhanced stability and H2O/SO2 durability of Zr–CeVO4/TiO2-NS was due to the limited formation of NH4NO3 and (NH4)2SO4/NH4HSO4. The excellent low operation temperature, low vanadium content and absence of WO3(MoO3) in this catalyst indicated that it has promising potential as a SCR catalyst for practical applications.
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Wei Qin,Xue Han,Junwei Wang,Xie Wang,Jianli Zhang
To design some excellent extractants for the separation of Zr(Ⅳ) and Hf(Ⅳ), a novel set of polyamidoamine dendrimers peripherally modified with salicylaldehyde (Abbreviated as PAMAM-SA) have been synthesized. UV-vis absorption and fluorescent spectrometry were used to study the selectivity of G.1.0, G2.0, G3.0 and G4.0 PAMAM-SA on Zr(Ⅳ) and Hf(Ⅳ) compared with other metal ions, and their extraction/separation performance on Zr(Ⅳ) and Hf(Ⅳ) was also investigated under different pH solutions. The results show that these dendrimers have superior selectivity on Zr(Ⅳ) and Hf(Ⅳ) as compared with Ca 2+ , Mg 2+ , Fe 3+ and Ni 2+ ions. The binding stoichiometry of G1.0, G2.0, G3.0 and G4.0 PAMAM-SA dendrimers with Zr(Ⅳ) is 1:4, 1:8, 1:10, 1:16 molar ratio determined by fluorescent titration respectively and the molar ratio of these dendrimers with hafnium is similar to that of zirconium. Both of the maximum extraction efficiency (EE%) on Zr(Ⅳ) and the separation coefficient (β Zr/Hf ) are following the order of G2.0-PAMAM-SA > G1.0-PAMAM-SA > G3.0-PAMAM-SA > G4.0-PAMAM-SA, and the maximum EE% on Zr(Ⅳ) is up to 98.9% and furthermore the β Zr/Hf is 1.52 for G2.0-PAMAM-SA at lower acid concentration compared with the reported extractants. The favorable higher EE% and β Zr/Hf indicate that G2.0-PAMAM-SA may be potentially employed as a highly selective and efficient extractant to enhance separating zirconium from hafnium.
研究领域:
化学
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材料科学
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产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 45
·期 3
·1263-1279
·
IF 1.674
Feng Sheng,Wang Runbai,Feng Shanshan,Zhang Zhihui,Mao Lebao
A novel ternary complex photocatalyst (UiO-66/ g -C 3 N 4 /Ag) was fabricated by chemical protonation coating and photodeposition and its physicochemical parameters, crystal morphology, and electrochemical properties characterized using a series of techniques. Proper addition of g -C 3 N 4 and Ag effectively enhanced the separation and mobility of photoinduced charge and improved the visible-light absorption and thereby the catalytic performance. Degradation experiments on target contaminants such as Rhodamine B (RhB) dye and 2,4-dichlorophenoxyacetic acid (2,4- d ) showed that the photocatalytic ability of UiO-66/ g -C 3 N 4 /Ag(15) was greatly increased compared with the parent material. Moreover, the composite could be regenerated by a simple ethanol washing process and exhibited stability and high reusability over six cycles. Finally, experiments on trapping of active species revealed that superoxide radicals (·O
− 2
), holes (h + ), and hydroxyl radicals (·OH) were primarily responsible for the photodegradation of RhB and 2,4- d .
研究领域:
环境科学
·
材料科学
·
光催化技术
✓ 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）