RSC Advances
·
2021
·Vol. 11
·期 4
·2397-2404
·
IF 3.361
Jing Chen,Yali Xu,Shuying Li,Fanghong Xu,Qian Zhang
Tetracycline detection has been a great concern because of its overuse and difficulty in degrading. Here, a detection method with ratio fluorescence was developed by synthesizing Eu3+ doped nanocomposites with NH2-MIL-53(Al) nanosheets. After adding tetracycline, the fluorescence intensity at 616 nm characteristic emission peak of Eu3+ was sensitized by the antenna effect generated from coordinating Eu3+ with tetracycline, but the fluorescence of NH2-MIL-53(Al) at 433 nm was quenched by the fluorescence resonance energy transfer between the Eu3+-tetracycline composition and NH2-MIL-53(Al). Therefore, the efficient detection of tetracycline was achieved based on this change of ratio fluorescence signal. The experimental results show that Eu3+/NH2-MIL-53(Al) has excellent selectivity, a wider linear range and a lower detection limit for detecting tetracycline. This method can afford favorable ideas for developing advanced chemical and biological sensors.
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PubMed
高影响因子
ANALYTICAL LETTERS
·
2020
·
IF 1.467
Meijuan Ren,Huan Wang,Yuanyuan Liu,Qin Ma,Wenjing Jia,Mingzhu Liu,Huiju Wang,Yongchang Lu
Amino-MIL-53(Al) nanosheets were synthesized by a hydrothermal reaction and were employed as a fluorescent probe because of their high quantum yield and excellent stability. The amino-MIL-53(Al) nanosheets have a maximum fluorescence emission peak at 435 nm using an excitation wavelength of 335 nm. The fluorescent intensity of luminophor at 435 nm was linearly quenched when mercury (II) (Hg2+) was added, which occurred due to the adsorption of Hg2+ onto the luminophor surface. Under these conditions, the fluorescent signal of the system is in the “turn-off” state. Following the addition of glutathione (GSH) into the system, the quenched fluorescence intensity may be partially restored based on the reaction between glutathione and Hg2+. In this condition, the fluorescent signal of the amino-MIL-53(Al)-Hg2+ system is in the “turn-on” state. Therefore, the amino-MIL-53(Al) nanosheets were successfully used as a “turn-off-on” fluorescent sensing system to determine the concentrations of Hg2+ in Tibetan medicine and glutathione in rabbit serum. A good correlation coefficient was obtained between the quenching of the fluorescence intensity of luminophor and the concentration of Hg2+ using the optimized conditions. A linear range was acquired from 1.96 nM to 38.27 μM with a detection limit of 0.23 nM of Hg2+ based upon a signal-to-noise ratio of three. For glutathione, the linear dynamic range was from 210 nM to 15.25 μM with a detection limit equal to 8.11 nM based upon a signal-to-noise ratio of three. This developed sensor system has the advantages of high selectivity, favorable sensitivity and simple operation for the determination of Hg2+ and glutathione in real samples.
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Journal of Chemistry
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2020
·
IF 1.79
Xiaofang Liu,Zhigang Liu,Qiuyun Zhang,Hongguo Wu,Rui Wang
MIL-101(Fe) was explored for the first time for the catalytic conversion of glucose into lactic acid (LA). The as-synthesized MIL-101(Fe) was successfully characterized, and its higher specific surface area, porosity, and feasible acid properties were confirmed to determine the remarkable catalytic activity in glucose-to-LA conversion (up to 25.4% yield) compared with other catalysts like MIL-101(Cr, Al) and UiO-66(Zr). The reaction parameters including temperature, reaction time, and substrate species as well as catalyst reusability were discussed.
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Journal of Analysis and Testing
·
2019
·Vol. 3
·期 3
·238-245
·
IF 0
Sun Shihao,Fan Yaofang,Du Jiaoyang,Song Zhilian,Zhao Huimin
Over the past few decades, the enzyme-mimicking activity of metal–organic frameworks (MOFs) accompanied with structural characteristics has aroused much attention. However, pure MOFs have low affinity with DNA. Here, iron-based MOFs with acidized carbon nanotubes (CNTs) via a simple hydrothermal process have been synthesized, named as MIL-88(NH 2 )-Fe@CNTs. CNTs can enhance the affinity between MOF and DNA, achieving flexible regulation of their catalytic activity benefiting from the strong π − π stacking between CNTs and DNA. Meanwhile, in comparison with conventional iron-based MOFs, the addition of CNTs, which contributes to the acceleration of electron transfer, endowing as-prepared nanocomposites remarkably enhanced peroxidase-like activity to achieve an ultrasensitive detection of H 2 O 2 with the LOD of 17.64 μg/L. Notably, the as-prepared nanocomposites with adsorbed DNA displayed excellent affinity towards both TMB (3, 3′, 5, 5′-tetramethylbenzidine) substrates and H 2 O 2 as well as high catalytic velocity. On the basis of their switchable peroxidase-like activity regulated by different length or sequence of ssDNA, it is believed that our-prepared MOF-based nanomaterials would be promising for fabricating versatile and sensitive label-free colorimetric assays for diverse targets.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Zhongming Zhang,Enfang Gou,Zhiying Zhao,Jie Yao
The recovering of phenolic compounds from waste waters is of vital significance owing to their strong toxicity, carcinogenicity and potential biological accumulation. Herein, different organic ligands-functionalized MIL-101 particles were synthesized and introduced into the polyether block amide (PEBA) matrix to construct excellent mixed matrix membranes (MMMs) for the permselective pervaporation of phenol. A range of characterization techniques were employed to investigate the physicochemical properties of these MIL-101 based particles and the resultant membranes. It was found that the incorporation of ligand-modified MIL-101 demonstrated better interfacial compatibility and hydrophobicity than the unmodified MIL-101. The BMIL-101/PEBA-3 membrane exhibited optimum separation factor of 12.47 and corresponding total flux of 1711.71 g·m −2 ·h −1 at 50 °C for a 1000 ppm phenol solution. The separation factor increased by 4.83 % versus FMIL-101/PEBA-3 membrane. However, in comparison to the original PEBA polymer membrane, the total flux and separation factor climbed by 16.96 % and 10.95 %, respectively, whereas the MMMs introducing unfunctionalized MIL-101 (3 wt%) exhibited a reduction in the phenol separation factor. Effects of polymer solution concentration, casting solution thickness, filler content, operating temperature, and phenol concentration on membrane separation performance were explored systematically. What’s more, the BMIL-101/PEBA-3 membrane also presented outstanding long-term stability for 84 h, which also provides novel guidelines to develop high-performance membranes for phenol recovery.
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JOURNAL OF POROUS MATERIALS
·
2019
·Vol. 26
·期 6
·1839-1850
·
IF 1.947
He Lei,Zhang Yaqin,Zheng Yane,Jia Qingming,Shan Shaoyun,Dong Yanan
An effective catalyst of MIL-101(Fe)/TiO 2 composite was synthesized by solvothermal method. The resultant MIL-101(Fe)/TiO 2 was used for advanced oxidation degradation of tetracycline (TC) for the first time. The results indicated that the MIL-101(Fe)/TiO 2 showed higher TC degradation efficiency than pure MIL-101(Fe) or TiO 2 with the persulfate. Using 1 g L −1 MIL-101(Fe)/TiO 2 and persulfate at pH 7, 90.15% degradation rate was achieved under xenon lamp irradiation in 5 min for 20 mg L −1 TC. TiO 2 introduced in the composite played an important role in the degradation process, in which TiO 2 had a synergetic effect with Fe 3+ to generate Fe 2+ , Ti 3+ and radicals. Fe 2+ reacted with persulfate to produce Fe 3+ and a number of · OH to degrade TC. This reaction process was so fast that MIL-101(Fe)/TiO 2 with persulfate could degrade TC fairly rapidly. A novel TiO 2 -based metal–organic frameworks (MOFs) composite was more efficient for degrading pharmaceutical wastewater.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Yongwei Chen,Houxiao Wu,Daofei Lv,Renfeng Shi,Yang Chen,Qibin Xia,Zhong Li
In the petrochemical industry, ethane/ethylene (C2H6/C2H4) separation is one of the most important processes. Herein, we reported an iron-based metal–organic framework MIL-142A for efficiently trapping C2H6 from C2H6/C2H4 mixture, exhibiting preferential adsorption of C2H6 over C2H4. After various characterization techniques to confirm the successful preparation of MIL-142A, the C2H6 and C2H4 adsorptive separation performance was systematically investigated. Results showed that MIL-142A had remarkably higher C2H6 adsorption capacities than that of C2H4 at 298, 288, and 278 K, such as C2H6 and C2H4 adsorption capacities of 3.8 and 2.9 mmol/g at 298 K and 100 kPa, respectively. In addition, the C2H6 and C2H4 adsorption heats were relatively low and in the corresponding ranges 27.3–25.1 and 26.2–23.8 kJ/mol, which is a favorable property for the regeneration of MIL-142A with less energy penalty. Furthermore, it was inferred that the difference between the adsorption heat for C2H6 and C2H4 with the MIL-142A framework governed the selective adsorption of C2H6 over C2H4. The ideal adsorbed solution theory (IAST) selectivity of C2H6/C2H4 was high up to 5.8 in the initial low pressure and then decreased to 1.5 at 298 K and 100 kPa. Besides, breakthrough experiments also corroborated its efficient separation of C2H6/C2H4 mixture. Additionally, MIL-142A had excellent moisture stability, and its framework remained still intact after being exposed to humid conditions (80% RH) for 15 days. These comprehensive properties demonstrated that this unique material MIL-142A, as a high-performance C2H6-selective adsorbent, can be potentially used for highly adsorptive separation of the C2H6/C2H4 mixture.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Shaoan Cheng,Yangxi Li,Zhen Yu,Yuqing Su
Adsorption can be used as a pollutant removal method to solve the increasingly serious problem of synthetic dye pollution and metal organic framework (MOF) is considered as a novel adsorbent for its unique structure. However, the high cost and high toxicity during the synthesis procedure of MOFs like MIL-101(Cr) limited their potential on the large-scale production and application. In this paper, waste PET plastic was depolymerized to prepare terephthalic acid (TPA) as an organic linker to synthesize MIL-101(Cr). Besides, Hydrofluoric acid (HF) was not added during the synthesis to avoid poisonous pollution. MIL-101(Cr) was applied to the adsorption of anionic dyes reactive red 2 (RR2) and reactive blue 19 (RB19). The batch experiments exhibited kinetic data best fitted the pseudo-first-order model (PFO) with the adsorption capacity of 662.87 (RR2) and 863.67 mg g -1 (RB19). The isotherm adsorption data fitted well with the Freundlich isotherm, indicating formation of multilayer coverage over the surface of MIL-101(Cr). The highest regeneration rate of MIL-101(Cr) at the fourth cycle was 91.18 and 91.44 % after RR2 and RB19 adsorption. X-ray photoelectron spectroscopy (XPS) technique and Fourier Transform Infrared (FTIR) spectroscopy both indicated the possible adsorption mechanism of MIL-101(Cr) toward RR2 and RB19 could be attributed to electrostatic interactions, hydrogen bonding, and the π-π stacking. This work proposed a novel method using waste plastics as raw materials to synthesize eco-friendly pollutant adsorbent, which had an enlightening effect on pollutant treatment.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2025
·Vol. 27
·期 8
·4278-4289
·
IF 2.9
Ziyu Li,Mei Li,Rongsheng Xu,Zhiliang Jin
The electron transfer rate in photocatalysts is one of the factors determining their hydrogen production activity. In this work, NH2-MIL-88B(Fe) (NFM) was synthesized using a one-step hydrothermal synthesis method and NFM/GDY-25 (NFMG-25) was successfully synthesized by loading graphdiyne (GDY) onto the surface of NFM. The hydrogen production performance and the mechanism of the prepared photocatalysts were systematically investigated using XRD, SEM, FT-IR, XPS, UV-Vis, PL and photoelectrochemical tests. The results showed that the hydrogen production of NFMG-25 reached 61.7 μmol in 5 hours. Photoelectrochemical and Mott–Schottky tests demonstrated that the composite catalyst exhibited high photogenerated carrier separation efficiency and single catalysts were n-type semiconductors. The conduction bands of NFM and GDY were −0.36 V and −0.56 V, respectively, while the valence bands were 1.90 V and 1.12 V. NFM acted as an electron acceptor and donor, which accelerated the transfer of the electrons, and enhanced the photocatalytic hydrogen production efficiency of the composite system. This study provides an effective method for using NFM in photocatalytic hydrogen production.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Ziqiang Zhang,Zhengfeng Shen,Chuanyu Zhu,Yunfang Wang,Yawen Wang,Caimei Fan,Rui Li,Jianxin Liu
Producing hydrogen from organic/inorganic hydrides is an innovative clean energy alternative to fossil fuels , addressing the increasing energy demands. Here, we first propose coupled photocatalytic water hydrogen production and N,N-dimethylformamide (DMF, C 3 H 7 NO) dehydrogenation technology to obtain high value-added H 2 and N,N-dimethylcarbamic acid (C 3 H 7 NO 2 ). ZnIn 2 S 4 @MIL-125(Ti) nanoheterostructures were synthesized using a simple solvothermal method and resulting in a photocatalytic H 2 production rate of 2.135 mmol h −1 g −1 (apparent quantum efficiency at 380 nm was 2.6 %) which is 2.77 times higher than pure ZnIn 2 S 4 . Liquid-phase mass spectrometry indicates that the DMF oxidation activity of ZIS@MIL heterojunction is double pure ZnIn 2 S 4 and only microcrystalline CO 2 is produced. Isotopes indicate that the production pathway of H 2 results from the coupling of the –CHO bond in DMF and the –H in water. The improved photocatalytic activity of the ZnIn 2 S 4 @MIL-125(Ti) heterostructure is attributed to facilitating efficient charge carrier transfer and separation and DMF depletion of holes accelerates electron transfer .
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JOURNAL OF POROUS MATERIALS
·
2025
·
IF 3.2
Rui Guofen,Hu Zihao,Wu Huiqi,Ma Jianfeng
Composites of MIL-101(Fe)/CoFe 2 O 4 were prepared by a simple solvothermal approach and these composites were explored for tetracycline (TC) degradation by using light and persulfate (PS). MIL-101(Fe)/CoFe 2 O 4 catalyst showed superior catalytic performance when combined with photocatalysis and chemical catalysis. Experimental results suggest that the degradation efficiency reached 83% within 40 min. The TC adsorption ability of MIL-101(Fe)/CoFe 2 O 4 was tightly associated with pH, which can be interpreted through isoelectric point. Oxygen-active species, containing singlet oxygen ( 1 O 2 ) or superoxide radicals (O· 2‾), were also generated when there was dissolved oxygen, which could decompose the TC organic contaminant in solution. To be specific, MIL-101(Fe)/CoFe 2 O 4 /PS/Vis catalytic system was capable of eliminating TC through forming h + , 1 O 2 , O· 2‾, hydroxyl radicals (·OH) and sulfate radicals (·SO 4 ‾) species. Moreover, MIL-101(Fe)/CoFe 2 O 4 composite material showed outstanding stability.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yeshuang Wang,Mingxian Duan,Zhelin Su,Chao Yang,Bingning Wang,Jiawei Kou,Huiling Fan
The abundant Fe 3+ Lewis acidic sites and well-developed pore structure endow the Fe-MOFs with great potential for H 2 S catalytic oxidation at room temperature, but their performance is inferior owing to the insufficient redox ability of the Fe 3+ species inherent in frameworks. Herein, an effective protocol was proposed for the first time to remarkably improve the catalytic oxidation performance of MIL-100(Fe) under ambient conditions through the introduction of Fe 2+ coordinatively unsaturated site (CUS) species into the framework. As expected, the sample after modification had a superior H 2 S breakthrough capacity of 267.3 mg S/g, an 18.4-fold increase compared with that without Fe 2+ CUS (14.5 mg S/g). The introduced Fe 2+ species triggered the Fe 3+ /Fe 2+ redox cycle for H 2 S catalytic oxidation by enhancing the oxidative ability of the Fe 3+ CUS intrinsic to the framework. Moreover, the Fe 2+ CUS was also found act as an active site for O 2 activation into O 2 ∙– , which not only provides an additional pathway for H 2 S catalytic oxidation but also accelerates the redox cycling of Fe 3+ /Fe 2+ during the catalytic oxidation process. On the basis of the experimental findings, a plausible catalytic mechanism involving mixed-valence iron sites in MIL-100(Fe) was proposed.
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