MATERIALS LETTERS
·
2019
·
IF 3.019
Xin Li,Jin Zhang,Wanling Shen,Shutao Xu
MIL-53(Cr) is a well-known and important metal-organic framework material. However, the long synthesis time of MIL-53(Cr) restricts its applications. Herein, we report a facile method to kinetically modulate the crystallization route and decrease the synthesis time of 72 to only 8 h by simply increasing the usage of HF.
研究领域:
材料科学
·
无机化学
·
纳米技术
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高影响因子
TURKISH JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 4
·1281-1290
·
IF 1.151
WANG JI,WANG QINGYIN,WANG GONGYING
Poly(ethylene terephthalate) (PET) is one of the world's five major engineering plastics and is widely used in various fields. At present, the main catalysts used in the synthesis of PET are antimony, titanium, and aluminum metal compounds. Among them, antimony-based catalysts are poisonous and the titanium-based catalyst products are relatively yellow in hue. The aluminum-based catalyst has the advantages of low price and environmental friendliness, but current research shows that the organoaluminum catalyst has the problem of hydrolysis, and MIL-53 (Al) has good stability and will not affect the environment, so we add a catalyst before the esterification reaction, and uses thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscope (SEM), and N2 low-temperature physical adsorption characterizes the thermal stability and structure of MIL-53(Al). At the same time, the effects of different content, polycondensation time, before and after activation and polycondensation temperature on the properties of PET were investigated. The research results show that when the molar content of catalyst is 0.05% and the reaction temperature is 280 oC for 150 min, the product obtained is relatively excellent. The catalytic activity has almost no effect before and after activation, indicating that the polycondensation reaction is carried out on the surface of the catalyst. Therefore, MIL-53 (Al) has great potential in PET industrial catalysis.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
·
IF 11.698
He Xiao,Wenyao Zhang,Qiushi Yao,Liulian Huang,Lihui Chen,Bruno Boury,Zhongwei Chen
Metal organic frameworks (MOFs) are exploited in many applications of materials science and very recently were investigated as precursors or reagents for material synthesis. In a new way different from previous approaches, here we introduce for the first time the synthesis of metal oxide M x O y in the presence of M-free MOF acting partially as a sacrificial template and as a provider of doping metal atom. We demonstrate this approach in the case of ZnO prepared by a simple hydrothermal method in the presence of a Zn-free MOF like MIL-53(Al) or MIL-125(Ti). The resulting ZnO show low content of Al or Ti < 2% and properties are significantly different depending on whether MIL-53(Al) or MIL-125(Ti) are used or if no MOF is present. The nature and presence of MOF has different major effects on the morphology, the specific surface area of as prepared ZnO and also on the oxygen defects in its crystal structure. Corroborating the XPS, UV–vis DRS, PL, EPR and DFT studies evidence the role of such O-defects on band gap narrowing for samples calcined at 400 °C. These exhibit high efficiency in photodegradation of methyl orange (MO) compared to ZnO prepared in MOF-free conditions or previous literatures. The kinetics of MO degradation is different depending on the morphology, the specific surface and oxygen defects. The present data open the door to a new approach of the synthesis of metal oxides and a control of their properties.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Qinchao Shao,Xiubin Zhang,Pei Liang,Qiang Chen,Xiaohua Qi,Mingqiang Zou
Fabrication of a magnetic substrate based on metal–organic frameworks (MOFs) with high sensitivity and stability for surface-enhanced Raman scattering (SERS) analysis were reported in this paper. MIL-101(Cr) nanoparticle prepared via a traditional hydrothermal reaction, which was combined with Fe 3 O 4 to synthesize the Fe 3 O 4 /MIL-101(Cr) composites. Then, the concentration of chloroauric acid and the time of reduction reaction were adjusted to acquire the optimal Au/Fe 3 O 4 /MIL-101(Cr) (AF-MIL) SERS substrate. The detection ability of the substrate can down to 10 -8 mol/L for Rhodamine 6G (R6G) as probe molecule, and the relative standard deviation (RSD) is only about 4.48 %, which indicates that it possesses wonderful SERS performance and uniformity. Finally, the as-synthesized substrate has been adopted to test the trace level sulfapyridine, with its desirable detection ability can down to 10 -6 mol/L. Such desirable SERS substrate with facile and effective operation holds great promise in the fast sensitive detection of the antibiotic residue and some other pollutants in environment.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2017
·
IF 3.615
Bo Xu,Xuejiao Li,Zhiming Chen,Tao Zhang,Cuncheng Li
Pd@MIL-100(Fe) composite nanoparticles were synthesized and characterized by high-resolution transmission electron microscopy (HRTEM), powder X-ray diffraction analysis, nitrogen adsorption-desorption analysis, X-ray photoelectron spectroscopic (XPS) analysis, energy-dispersive X-ray spectroscopy (EDS) and element mapping. Due to the local restriction or confinement effect of the unique pore/surface structure within the MIL-100(Fe) nanospheres , small Pd nanoparticle (4–6 nm) were obtained with high stability without using any surfactant as stabilizer . The as-synthesized Pd@MIL-100(Fe) composite nanoparticles were then employed for the catalytic reduction of 2/3/4-nitrophenol, which exhibiting high catalytic activity and recyclability attributed to the synergistic effect between Pd nanoparticles and MIL-100(Fe) nanospheres.
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LANGMUIR
·
2022
·
IF 4.331
Rutong Song,Jun Yao,Mei Yang,Zhongbin Ye
Metal–organic frameworks (MOFs), especially Fe-MOFs, have shown prospective application in eliminating organic dyes from wastewater due to their well-developed pores, water stability, easy preparation, and economy. Herein, we synthesized four types of Fe-MOFs (such as MIL-88A, MIL-88B, MIL-100, and MIL-101) using the hydrothermal method. The products were analyzed with several methods. By comparing the adsorption effect of those four types of Fe-MOFs on three kinds of dyes, it has been shown that MIL-100 owns the best adsorption efficiency on cationic organic dyes methylene blue (MB) and Rhodamine B (RhB) in 180 min, while all MOFs have slight removal capacity on methyl orange (MO). MIL-100, as an adsorbent, was studied under various research conditions, and the maximum removal efficiencies to MB, RhB, and MO were found to be up to 97.36%, 88.75%, and 13.00%, respectively. Furthermore, cationic dye MB’s removal by MIL-100 was fitted with a pseudo-second-order model and Langmuir isotherm model (Qm = 411.041 mg/g) by adsorption kinetics and isotherms research, and MIL-100 could rapidly and selectively divide MB from a binary complex aqueous solution of MB and MO. The as-fabricated MIL-100 also exhibited excellent recyclability after four adsorption–desorption recycles and can be treated as a potential substance with high removal efficiency of cationic organic dye-containing industrial effluents.
研究领域:
环境科学
·
材料科学
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DOI
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高影响因子
INORGANICA CHIMICA ACTA
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2019
·
IF 2.433
Zhongbao Liu,Wenqi Gao,Xin Qi,Fengfei Lou,Huiwei Lang
In this article, MIL-101(Cr) powder material was successfully prepared by hydrothermal synthesis and combined with different mass fractions of CaCl 2 by immersion method to obtain MIL-101(Cr)/CaCl 2 composite materials. The physical properties of the adsorbent were determined by X-ray powder diffraction, N 2 adsorption/desorption isotherm, TGA and FTIR. The water vapor adsorption performance of MOFs was tested by a gravimetric instrument to analyze the underlying mechanism. Results indicated that the specific surface area, total pore volume, and pore size distribution of micropores and mesopores of MIL-101(Cr)/CaCl 2 composites decreased with increasing CaCl 2 content. When P/P 0 = 0.9, the water vapor equilibrium adsorption capacities of MIL-101(Cr), MIL-101(Cr)/CaCl 2 -10%, MIL-101(Cr)/CaCl 2 -20%, and MIL-101(Cr)/CaCl 2 -30% were 1.05, 0.88, 1.13, and 1.35 g/g, respectively. MIL-101(Cr)/CaCl 2 -30% agglomerated after water absorption, so MIL-101(Cr)/CaCl 2 -20% was selected as the final experimental material. The water vapor adsorption heat of MIL-101(Cr)/CaCl 2 -20% was 42–58 kJ/mol, which is close to the evaporation enthalpy of water (44 kJ/mol at 25 °C). The analysis of the adsorption kinetics showed the relatively uniform adsorption rate of MIL-101(Cr)/CaCl 2 -20%. Overall, MIL-101(Cr)/CaCl 2 -20% exhibited superior water vapor adsorption performance and have great potential for application to adsorption heat pumps.
研究领域:
材料科学
·
化学工程
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Wenjuan He,Zuopeng Li,Shengchen Lv,Mingxin Niu,Wenfeng Zhou,Jing Li,Runhua Lu,Haixiang Gao,Canping Pan,Sanbing Zhang
The Fe 3 O 4 @MIL-100(Fe) hybrid composites are successfully synthesized via an in-situ growth method and characterized using various techniques. The ability of the magnetic metal–organic framework to promote photo-Fenton like processes is investigated using levofloxacin as a representative substrate. The results show that the composite with a Fe 3 O 4 :MIL-100(Fe) mass ratio of 1:4 has a higher degradation efficiency (up to 93.4%) than Fe 3 O 4 , MIL-100(Fe), and the other fabricated composites. This higher catalytic activity is ascribed to the synergistic effect between Fe 3 O 4 and MIL-100(Fe), by which the quick separation of hole-electron pair from MIL-100(Fe) and the efficient reduction of Fe 3+ to Fe 2+ in the photo-Fenton reaction are mutually promoted. Moreover, the composite shows favorable recyclability without apparent loss of apparent photo-Fenton activity even after five cycles, and more importantly, can be recovered magnetically. The possible degradation mechanism and intermediates of levofloxacin in the photo-Fenton reaction have been tentatively proposed based on free radical quenching, electron paramagnetic resonance and mass spectrometry analysis. Finally, the developed Fe 3 O 4 @MIL-100(Fe) is successfully applied for the removal of levofloxacin from spiked wastewater with removal efficiencies ranging from 77.9 to 85.5%, which indicates that the proposed system has significant potential for wastewater treatment applications.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2015
·Vol. 29
·期 9
·618-623
·
IF 2.248
Hongxu Guo,Di Guo,Zishan Zheng,Wen Weng,Jianhua Chen
Ag nanoparticle (NP)-decorated MIL-125(Ti) microspheres (Ag@MIL-125(Ti)) were firstly fabricated via a facile hydrothermal and following photo-reduction method. The photocatalysts were characterized using X-ray diffraction, scanning and transmission electron microscopies, X-ray photoelectron spectroscopy and UV–visible diffuse reflectance spectroscopy. The characterization results indicated that Ag NPs were dispersed on the surface of MIL-125(Ti) microspheres, and the Ag NPs had a uniform diameter of about 40 nm. The composites exhibited excellent visible-light absorption, due to the modification with the Ag NPs. The photocatalytic activity for the visible-light-promoted degradation of Rhodamine B was improved through the optimization of the amount of Ag loaded as a co-catalyst, this amount being determined as 3 wt%. Additionally, studies performed using radical scavengers indicated that O 2 − and e − served as the main reactive species. The catalyst can be reused at least five times without significant loss of its catalytic activity. Furthermore, a photocatalytic mechanism for degradation of organics over Ag@MIL-125(Ti) is also proposed. Copyright © 2015 John Wiley & Sons, Ltd.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2015
·
IF 2.037
Yu Zhang,Wei Su,Yan Sun,Jia Liu,Xiuwu Liu,Xiaojing Wang
MIL-101 is a promising adsorbent because of its large pore volume, high separation selectivity, easy regeneration, and good stability. MIL-101 was synthesized and characterized by X-ray diffraction, scanning electron microscopy, and nitrogen adsorption at 77 K. Adsorption isotherms of pure N2, CH4, and CO2 were measured on MIL-101 from 263 K to 313 K and at pressures up to 0.8 MPa. The Langmuir model was a good fit for the experimental isotherms and the isosteric heats of adsorption decreased in the order: CO2 > CH4 > N2. The CO2/CH4 separation selectivity was sensitive to the adsorption pressure and temperature and it varied from 3.2 to 6.3. In contrast, the CH4/N2 separation selectivity changed from 2.6 to 3.3 with temperature and pressure.
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Biosensors-Basel
·
2025
·Vol. 15
·期 10
·703
·
IF 5.6
Harriet Sonia Nalumansi,Fuwei Pi,Jingkun Li,Guoyong Jiang
The detection of volatile organic compounds (VOCs) is critical for ensuring food safety, particularly for identifying spoilage gases and food adulterants. Surface Enhanced Raman Spectroscopy (SERS) has traditionally relied on noble metals such as gold and silver for strong electromagnetic enhancement. However, these substrates present challenges in terms of cost, stability, and integration into real-world applications. In this study, we explore a hybrid metal–organic framework (MOF) with reduced graphene oxide (rGO) as a SERS active substrate. The developed material showed a good sensitivity for VOC formaldehyde (FA), easily detectable at peak 1452 cm−1and offering an RSD of 16.95%. Since the substrate did not rely on any noble metals for SERS enhancement, this low cost and easy material could be fine-tuned, creating alternative less-toxic materials for detection in industries such as food safety.
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PubMed
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Tianding Hu,Qingming Jia,Shanchuan He,Shaoyun Shan,Hongying Su,Yunfei Zhi,Lei He
Developing high-performance materials for removal of antibiotics has attracted ever-increasing concerns since variety of harmful antibiotics have been frequently detected in aquatic environments and posed a serious threat to both human health and ecosystems in recent years. In this work, a novel adsorbent (ED-MIL-101) for oxytetracycline antibiotic (OTC) was prepared by grafting ethylenediamine (ED) to Lewis acidic open metal sites in porous metal-organic framework MIL-101. The successful grafting was corroborated via FT-IR spectrum. Compared with the pristine MIL-101, ED-MIL-101 demonstrated a slight decrease in BET surface areas and pore sizes, while the basic frameworks remain invariant. Results for kinetics and thermodynamics showed that the aminofunctionalized adsorbent exhibited a predominant superiority over nongrafted MIL-101 and activated carbon (AC) on the removal of OTC, even though the specific surface area decreased remarkably after grafting. Moreover, ED-MIL-101 can be regenerated by simple washing with ethanol and reusable up to at least the third run with little change in adsorption capacity . Evidence from zeta potential showed that the adsorption of OTC was also driven by electrostatic interaction between the OTC and ED-MIL-101. These results indicate that ED-MIL-101 has great potential in removing OTC contaminant from water.
研究领域:
环境科学
·
材料科学
·
污染控制化学
·
吸附技术
·
水处理工程
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