COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Tao Tian,Jie Zhang,Sijie Ge,Lijiang Tian
Persulfate oxidation is a promising technology for air pollution control but still suffers from degrading refractory volatile organic compounds (VOCs) under mild conditions. Metal-doped metal-organic frameworks (MOFs) offer a novel strategy to enhance persulfate activation and VOCs degradation. Herein, a novel bimetallic MIL-101 (Fe, Cu) is prepared for more effective degradation of gaseous benzene via persulfate activation. Under optimal conditions (Fe/Cu ratio of 1:4, persulfate concentration of 7 mM/L, pH of 5, and reaction temperature of 70 °C), the MIL-101(Fe1, Cu4) activated persulfate system achieves a benzene degradation efficiency of 79.1 %, a value significantly higher than that of MIL-101(Fe) (20.1 %). The enhanced performance can be attributed to the synergistic effect of Fe²⁺/Fe³⁺ and Cu²⁺/Cu⁺ redox interactions facilitating the activation of persulfate and generation of radical species. Density functional theory (DFT) calculations indicate an increase in the adsorption energy of MIL-101(Fe) in the presence of Cu doping from −3.46 eV to −5.92 eV along with a rise in the Fermi energy level from 0.5 eV to 1.33 eV, enhancing the electron density and mobility. A reaction energy diagram is provided to illustrate the reaction pathways and transition states involved in the degradation of benzene. Overall, the incorporation of Cu in MOFs significantly enhances the efficiency of persulfate-based oxidation systems toward VOCs degradation.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2021
·
IF 4.076
Yichen Jiang,Zhijiang Wang,Ping Xu,Jianmin Sun
Dicationic ionic liquid 1,1′-(hexane-1,6-diyl)-bis(3-methylimidazolium) dibromide was synthesized inside an MIL-101 metal–organic framework via a facile ship-in-bottle technique. The resultant dicationic ionic liquid @MIL-101 composite contains Cr sites as a Lewis acidic center and Br– as a nucleophile. The high BET surface area (1162 m2/g) and good synergic effects between the dicationic ionic liquid and MIL-101 resulted in good CO2 sorption capacity (47.4 cm3/g at 273 K) and high catalytic activity for the cycloaddition reaction of CO2 with epoxide without any cocatalyst or solvent, and a 92.5% propylene carbonate yield was obtained under 100 °C, 1.0 MPa for 2.5 h. Moreover, the dicationic ionic liquid @MIL-101 composite also showed better recycling stability and easy separation in the CO2 cycloaddition reaction. Compared with the complex synthetic route for the reported ionic liquid functional metal–organic frameworks, the facilely synthesized dicationic ionic liquid @MIL-101 composite exhibited comparable performance in CO2 capture and utilization.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Zhaoyang Li,Yongjie Zhao,Qing Guan,Qian Liu,Sara Khan,Leilei Zhang,Xianze Wang,Lei Chen,Xia Yang,Mingxin Huo
Photocatalytic reduction of nitrate has attracted much attention recently, however, low efficiency and difficult separation have limited its application in practice. In this study, the novel direct dual Z-scheme AgBr(Ag)/MIL-101(Cr)/CuFe 2 O 4 (AB/M/CFO) was fabricated by the hydrothermal technology combined with the photodeposition method for the first time. The AB/M/CFO exhibited the highest nitrate conversion and nitrogen selectivity (79.9% and 94.5%, respectively) compared to AgBr(Ag)/MIL-101(Cr), MIL-101(Cr) and CuFe 2 O 4 for 30 min UV-light irradiation. The dual Z-scheme of AB/M/CFO enhanced electron transfer and charge separation, which was proved by transient photocurrent responses, leading to a significant improvement in photocatalytic efficiency. Meanwhile, after four cycles, the AB/M/CFO photocatalyst also displayed a strong magnetic separation ability and excellent recycling stability. Furthermore, the excitation and electron transfer process over dual Z-scheme AB/M/CFO photocatalytic material were proposed, based on the radical trapping experiments. Our work provides a new strategy to construct dual Z-scheme MOFs-based materials that have promising applications in photocatalytic reduction of pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 15
·3263-3269
·
IF 1.915
Yangjuan Wang,Kejing Du,Yifu Chen,Yijun Li,Xiwen He
Green octahedral crystals of MIL-101(Cr) were synthesized and used for the determination of Pb2+ at the trace level by differential pulse anodic stripping voltammetry (DPASV) because of their good adsorption capability for Pb2+. The synthesized MIL-101(Cr) was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS). Parameters affecting the electrochemical process, such as the pH of the electrolyte solution, the volume of the MIL-101(Cr) suspension, the potential and the time for accumulation, were investigated in detail. Under optimal conditions, the electrochemical sensor had a linear response over the concentration range of 1.0 × 10−9 to 1.0 × 10−6 mol L−1 (R2 = 0.999) with a detection limit of 5.0 × 10−10 mol L−1 (S/N = 3). The method was successfully applied to the determination in real samples and good recoveries are obtained from different spiked samples.
研究领域:
分析化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Xie Dan,Wang Ruimeng,Fu Jinghao,Zhao Zhongxing,Li Min
Surface-enhanced Raman scattering (SERS) is an important and powerful analytical technique in chemical and biochemical analyses. Metal–organic frameworks (MOFs) can effectively capture volatile organic compounds (VOCs) with high adsorption capacity and fast kinetics, and the local surface plasmon resonance characteristics of gold nanoparticles can quickly and effectively distinguish different VOCs by SERS. Combining both, we designed a novel SERS substrate based on embedding gold nanoparticles (AuNPs) within MIL-101(Cr) for the recognition of various VOCs in the gaseous phase. Occupying of AuNPs inside MIL-101(Cr) increased the micropore-specific surface area of AuNPs@MIL-101(Cr), which enabled AuNPs@MIL-101(Cr) to absorb more toluene molecules and consequently realized its high detection sensitivity. The detection limits for toluene, 4-ethylbenzaldehyde, and formaldehyde were down to 6, 5, and 75, ppm respectively. Moreover, this substrate could be used for detecting different VOCs simultaneously. Finally, we discussed the enhancement of AuNPs outside and inside MIL-101(Cr) on the Raman signal.
研究领域:
分析化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2018
·
IF 4.521
Zhenzhen Lin,Mengting Luo,Yindi Zhang,Xiaoxue Wu,Yanghe Fu,Fumin Zhang,Weidong Zhu
Heterogeneous catalytic conversion of biomass-derived methyl levulinate (ML) to γ-valerolactone (GVL) is highly attractive as a sustainable route to mitigating the dependence on nonrenewable fossil resources. However, this route is limited by its low selectivity toward GVL and severe reaction conditions. Here, we present a synergistic catalytic process that offers exclusive GVL selectivity with complete ML conversion under mild conditions (80 °C, 0.5 MPa of H 2 pressure). This is achieved over a dual-functionalized catalyst of Ru nanoparticles (Ru-NPs) and Brønsted acid SO 3 H groups in a Cr-based metal-organic framework (MIL-101). The Ru-NPs served as metal sites for the hydrogenation of ML to methyl-3-hydroxyvalerate (MHV) and the acidic SO 3 H moieties promoted the cyclization of MHV to generate GVL via lactonization. In contrast, GVL production was significantly suppressed over the physically mixed congener (2.0 wt% Ru/MIL-101 + MIL-101-SO 3 H). This result demonstrates an unrivalled advantage of the dual integration of metal/acid sites in a single MOF crystal, and the relative amount of sulfonic acid groups in the catalyst can exert significant influence on the overall catalytic performances. The activation energies for the hydrogenation and lactonization steps with the developed catalyst were 29.5 and 42.1 kJ/mol, respectively, which are much lower than those observed with the traditional 5.0 wt% Ru/AC catalyst.
研究领域:
化学工程
·
催化科学
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产品关联
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2017
·Vol. 50
·期 47
·475202
·
IF 2.588
Junliang Wu,Qibin Xia,Jing Xiao,Zhong Li
Catalytic performance of MIL-101—a type of chromium-based metal-organic frameworks (MOFs)—in a plasma catalysis system for toluene removal was experimentally studied. The MIL-101 was synthesized using a hydrothermal method, and its catalytic performance was compared to two other catalysts, Cr2O3/γ-Al2O3 and γ-Al2O3, in a dielectric barrier discharge (DBD) reactor. Results showed that the presence of a catalyst in plasma changed the voltage and current characteristic substantially, and promoted the performance of the plasma reactor. Among the catalysts, the MIL-101 exhibited a significantly high toluene conversion, which was 20% and 35% higher than Cr2O3/γ-Al2O3 and γ-Al2O3, respectively, under the same testing conditions, as well as higher carbon balance and CO2 selectivity. The analysis of by-products on the surfaces of the catalysts before and after reaction demonstrated that MIL-101 had better resistance towards by-products accumulation compared to Cr2O3/γ-Al2O3 and γ-Al2O3. The loading of MnOx on MIL-101 further promoted its catalytic performance. MIL-101 exhibits attractive catalytic properties as a catalyst in a plasma catalysis system for the decomposition of volatile organic compounds.
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
JOURNAL OF PHYSICAL CHEMISTRY B
·
2024
·
IF 2.8
Hong-Jie Zhang,Xue-Bin Shang,Xu-Ran Wang,Chen-Xi Zhang,Qing-Lun Wang
SCPEEK@MOF proton exchange membranes, where SCPEEK is sulfinyl chloride polyether ether ketone and MOF is a metal–organic framework, were prepared by doping Fe-MIL-101-NH2 into polymers. The amino group in the MOF and the -SOCl2 group in thionyl chloride polyether ether ketone cross-link to form a covalent bond through the Hinsberg reaction, and the prepared composite membrane has stronger stability than other electrostatic interactions and simple physical doping composite membranes. The formation of covalent bonds improves the water absorption of the composite membrane, which makes it easy for water molecules to form hydrogen bonds. Moreover, SPEEK as a proton conductive polymer and the synergy of MOFs improve the proton conductivity of composite membranes. The composite membranes were characterized by Fourier transform infrared spectroscopy, powder X-ray diffraction, scanning electron microscopy, and atomic force microscopy. The swelling rate, water absorption, mechanical stability, ion exchange capacity, and proton conductivity of the pure sulfonated polyether ether ketone (SPEEK) membrane were compared with those of the mechanically doped SPEEK/MOF membrane and the composite membrane SCPEEK@MOF doped with different ratios of Fe-MIL-101-NH2, and all of the SCPEEK@MOF showed superior performance. When the Fe-MIL-101-NH2 loading rate of the composite membrane is 2%, the proton conductivity of the composite membrane can reach 0.202 S cm–1 at 363 K and a 98% relative humidity, which is much higher than that of the SPEEK/MOF membrane obtained by simple physical doping under the same conditions.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Yu Zou,Wanshan Wang,Fengyin Duan,Wen Yun,Hong Chen,Yiping Li,Lizhu Yang
An ultrasensitive fluorescence detection strategy of chloramphenicol (CAP) was developed based on product catalysis of tetrahedral DNA framework (TDF) and fluorescent quenching of MIL-101(Fe). The product was used to catalyze the reaction. As the concentration of catalyst increased, the reaction time was significantly shorted to 21 min which was much shorter than other isothermal amplification technologies. Moreover, the multiple fluorophores of TDF and high efficient quenching ability of MIL-101(Fe) provided better performance with a linear range for CAP detecting from 1.6 pM to 80 pM and the limit of detection (LOD) as low as 0.67 pM. In addition, it also demonstrated good specificity and resistance to interference from other related antibiotics. Importantly, this strategy exhibited satisfactory relative standard deviation and recovery results for practical application, exhibiting a favorable application prospect in CAP analysis.
研究领域:
生物化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jiale Lu,Amin Jv,Hongyu Zhao,Guangbo Che,Bo Feng,Yufei Zhang,Chunbo Liu,Renquan Guan
MIL-101(Cr) is an ideal material for wastewater treatment due to its large specific surface area, excellent water stability, and chemical stability. However, its limited light absorption capacity hinders its application. We loaded ferrocene carboxylic acid (Fc-COOH) onto MIL-101(Cr) by a post-synthetic modification method, which resulted in the MOF possessing excellent optical properties while maintaining its original skeleton structure. The MIL-101(Cr)/Fc-COOH (1:2), (abbreviated as CFCC-2) exhibited the best performance, achieving a removal rate of 96% for tetracycline (TC) in just 30 min. This removal rate is significantly higher compared to MIL-101(Cr) and Fc-COOH, which achieved removal rates of only 15% and 21%, respectively. We propose a possible Z-type heterojunction mechanism between MIL-101(Cr) and Fc-COOH to explain the excellent photocatalytic performance of CFCC-2. The intermediates in TC were identified using LC-MS, and the toxicity of these intermediates was predicted and evaluated through the Toxicity Estimation Software Tool (T.E.S.T.). This study provides new insights into the design and fabrication of MIL-101(Cr)-based catalysts as photodegrading organic pollutants.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Lei He,Yanan Dong,Yane Zheng,Qingming Jia,Shaoyun Shan,Yaqin Zhang
A novel magnetic MIL-101(Fe)/TiO 2 composite was synthesized for photo degradation of tetracycline (TC) under solar light. The composite was characterized by XRD, TGA, SEM, TEM, EDS, BET, FTIR, XPS, VSM, ESR, and PL. The resultant composite was environment friendly material, which exhibited high TC degradation efficiency and excellent reusability. In the meantime, it could be separated easily from TC solution by using magnet, which would save significant time and cost of preparation and degradation, having broad prospect in application. Using 1 g L −1 magnetic MIL-101(Fe)/TiO 2 at pH = 7, 92.76% degradation efficiency was achieved under solar light irradiation in 10 min for 20 mg L −1 TC. Further experiments indicated that TiO 2 introduced in the composite played an important role in the degradation process, which could be activated by the UV light in solar light to generate large amount of O 2 − and OH radicals. The degradation efficiency of TC in this paper was significantly higher than other research papers reported in last three years. This study put forward new magnetic Fe-based metal-organic frameworks (MOFs)/TiO 2 composite for degrading pharmaceutical wastewater.
研究领域:
环境科学
·
材料化学
·
光催化
·
水处理
·
纳米材料
·
药物降解
✓ 已验证
DOI
高影响因子
ANALYST
·
2013
·Vol. 139
·期 4
·801-806
·
IF 3.969
Jing Mei Fang,Fei Leng,Xi Juan Zhao,Xiao Li Hu,Yuan Fang Li
A label-free and sensitive fluorescence method for recognition of sequence-specific DNA using DNA-intercalating dye and metal–organic frameworks (MOFs) is developed. Here, MIL-101 (Cr3F(H2O)2O[(O2C)–C6H4–(CO2)]3·nH2O) is introduced as a quenching platform to decrease the high background fluorescence of SYBR Green I (SG)/probe DNA complex. Mechanism investigations show that MIL-101 can strongly adsorb the SG/probe DNA complex through π–π stacking and electrostatic interactions, and as a consequence, the fluorescence of the SG dye is greatly quenched. While in the presence of target DNA, the as-formed rigid double-stranded (ds) structure of DNA will be far away from the surface of MIL-101; meanwhile, the SG dye can be bound with the dsDNA in the mode of intercalation and minor groove binding, resulting in enhancement of the SG dye fluorescence. The increased signal-to-background ratio has a linear relationship with the concentration of target DNA in the range of 0.1–14 nM. It is confirmed that the detection limit is 73 pM (3σ), which is much lower than that based on the carbon nanotubes and graphene oxide platform. Moreover, one-base-mismatched target DNA can be discriminated effectively. With the introduction of MIL-101, the signal-to-background ratio has been improved ∼8-fold, demonstrating that MIL-101 is an efficient low-background signal platform.
研究领域:
分析化学
·
生物化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）