WATER SCIENCE AND TECHNOLOGY
·
2017
·Vol. 75
·期 12
·2800-2810
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IF 1.197
Wu Shi-chuan,You Xia,Yang Cao,Cheng Jian-hua
MIL-68(Al), a powdered aluminum-based metal organic framework (MOF), was synthesized and used to explore its adsorption behavior toward methyl orange (MO). The adsorption isotherm, thermodynamics, kinetics, and some key operating factors as well as changes in the material's structure were investigated. The adsorption isotherm conformed to the Langmuir isotherm model and the maximum equilibrium adsorption capacity was 341.30 mg g −1 . Thermodynamic data demonstrated that the adsorption process was spontaneous, endothermic and showed positive entropy. For kinetics, the process of MO adsorption onto MIL-68(Al) was more suitably described by a pseudo-second-order model. Electrostatic and hydrogen-bonding interactions contributed to dye adsorption, with electrostatic interactions considered to be the principal binding force between adsorbent and adsorbate. Furthermore, MIL-68(Al) maintained a stable structure after adsorption. From these results, MIL-68(Al) was suggested here to be a stable MOF adsorbent for removing MO from aqueous solution.
研究领域:
环境化学
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材料科学
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物理化学
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污染控制
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吸附科学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2023
·
IF 8.4
Ning Sui,Yifeng Xu,Peng Zhang,Shuang Cao,Tingting Zhou,Tong Zhang
The crucial challenge to exploit effective ozone (O 3 ) gas sensors lies in developing novel functional sensing materials to meet the requirement of trace-level detection threshold (50 ppb). Metal oxide semiconductors (MOSs) with controllable heterogenous composites as high-performance sensing layers are expected to break through this bottleneck. This work proposes the hybridization of MIL-68 (In) and ZIF-8, which are employed as dual metal organic frameworks (MOFs) sacrificial templates to design n-n heterostructures . The derived In 2 O 3 backbone showed a hexagonal prismatic structure with a large aspect ratio. The robust architecture enabled the uniform decoration of mass of ZnO nanoparticles (NPs) on the surfaces without the damage of high porosity for the gas diffusion. Consequently, the optimal sensor with appropriate ZnO NPs loading amount exhibited trace O 3 detection ability as low as 15 ppb, which was attributed to the smart design of n-n heterostructure, rich active sites and improved oxygen-adsorbing capacity. Thus, this work inspires a new way to utilize the versatile dual MOFs template for constructing heterogenous composites as O 3 sensing materials.
研究领域:
材料科学
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传感器技术
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环境监测
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产品关联
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Peihang Shen,Zelong Liu,Yibo Zhang,Zelin Meng,Mingyang Song,Heming Zhao,Jianglei Hu,Fengwei Shi
Vinyl-functionalized SBA-15 was synthesised using a one-pot co-condensation method followed by carboxylation via nitric acid, with the intermediate product named SBA-15C. MIL-68 was then synthesised in-situ by adsorption of Al 3 + ions via carboxylate groups on SBA-15C to give the composite xMIL-68(Al)@SBA-15C. A series of characterizations were conducted by Fourier transform infrared spectroscopy, Brunner-Emmet-Teller measurements, X-ray diffraction, X-ray photoelectron spectroscopy, Scanning electron microscope, and Transmission Electron Microscope. xMIL-68(Al)@SBA-15C maintained robust catalytic performance in the NaBH 4 -mediated reduction of 4-nitrophenol to 4-aminophenol, with no significant decrease in activity after five cycles of reuse.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yan Jiang,Ping Wang,Ji Li,Xianfa Zhang,Yingming Xu,Hui Zhao,Xiaoli Cheng,Shan Gao,Lihua Huo
The porous and tubular structure is conducive to improving performance of sensing materials. At present, how to obtain sensitive materials with unique porosity and high surface activity by green, low-cost and simple synthesis methods is still a challenge. In this work, novel In 2 O 3 porous microtubes were obtained by water etching of MIL-68-In and calcination methods for the first time. The as-prepared microtubes exhibit excellent NO 2 sensitivity at 50 ℃ (S=156–3 ppm NO 2 ), and the limit of detection is 50 ppb. The sensor also has good NO 2 detection ability in the actual environment. The excellent NO 2 sensing performance at low temperature is closely related to high surface activity of In 2 O 3 porous microtubes. Combined with TPD, in-stiu DRIFT and XPS technologies, the NO 2 sensing mechanism was detailed analyzed. This work provides useful guidance for constructing high performance NO 2 sensor. The excellent NO 2 sensing performance at low temperature makes a positive contribution to promoting the application of metal oxide sensors in environmental detection.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Ruowen Liang,Zhoujun He,Yi Lu,Guiyang Yan,Ling Wu
Although both step-scheme (S-scheme) heterojunction and metal–organic framework (MOF) photocatalysts have been intensively studied, few efforts have been devoted to combining them to establish high-performance MOF-based S-scheme photocatalysts. In this work, binary Ag@MIL-68(Fe) (Ag@MFe) hybrids were first fabricated by decorating Ag nanoparticles (Ag NPs) onto MIL-68(Fe), an Fe-based MOF. Owing to the high specific surface area of MIL-68(Fe), the plasmonic Ag NPs were uniformly distributed on its surface. Then, AgBr particles were deposited on the Ag@MFe hybrids via precipitation to form the final ternary sandwich-like hierarchical AgBr-Ag@MFe photocatalyst. The 30 %AgBr-1.5 %Ag@MFe sample exhibited excellent photocatalytic performance for the degradation of rhodamine B under visible light irradiation ( λ ≥ 420 nm), with an effectiveness 9.2 and 2.1 times higher than those of the original MIL-68(Fe) and binary 1.5 %Ag@MFe hybrid, respectively. Furthermore, 30 %AgBr-1.5 %Ag@MFe performed as a high-efficiency bifunctional photocatalyst towards the detoxification of water contaminants (mixture of a dye and Cr(VI)). The significantly enhanced photoactivity was attributed to the effective spatial separation of photogenerated electron–hole pairs via S-scheme charge transfer. Moreover, the plasmonic Ag NPs assembled into the contact interface of AgBr and MIL-68(Fe) enhanced the vectorial interfacial electron transfer. The formation of an S-scheme heterojunction was supported by X-ray photoelectron spectroscopy and electron spin resonance studies. This novel bifunctional AgBr-Ag@MIL-68(Fe) hybrid photocatalyst system not only provides new opportunities for environmental remediation but also highlights a promising strategy to construct high-efficiency S-scheme photocatalysts.
研究领域:
材料科学
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环境科学
·
光催化技术
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产品关联
DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Jing Wang,Yong Zhang,Fubin Liu,Ying Liu,Litao Wang,Guihua Gao
A multifunctional cylindrical hybrid foam column, referred to as the chitosan/cyclodextrin/MIL-68(Al) (CS/CD/MIL-68(Al)) foam column, was prepared for the first time. The prepared foam column could be used for the adsorption/removal of hydrophilic and hydrophobic contaminants by different forms. Here, it was placed in hydrophilic dye solutions to investigate the adsorption behavior of methylene blue and trypan blue. The adsorption process followed the pseudo-second-order kinetic model with R2 ranging from 0.9983 to 0.9998 for methylene blue and from 0.9993 to 1.0000 for trypan blue, and the adsorption process was consistent with the Langmuir isothermal model with R2 greater than 0.96. The RL values for methylene blue and trypan blue were 0.8871 and 0.5366, respectively, which were present between 0 and 1, indicating that the adsorption behaviors of the two dyes onto the CS/CD/MIL-68(Al) foam column were favorable. The maximum adsorption capacities (Qm) of methylene blue and trypan blue were 60.61 and 454.55 mg/g at 298 K, respectively. Also, the CS/CD/MIL-68(Al) foam column was spun into a syringe and used to adsorb trace hydrophobic sulfonamides from water in the form of filtration. The porous structure impeded the need for any external force and equipment, allowing the water sample to pass through the foam column smoothly. The conditions of the CS/CD/MIL-68(Al) foam column were optimized. The adsorption was carried out under the condition of pH = 4, the amount of the adsorbent was two foam columns, and no salt was added. It was found that the removal rate of the CS/CD/MIL-68(Al) foam column for six sulfonamides was 100%, and it could be reused at least five times. Therefore, this CS/CD/MIL-68(Al) foam column had a simple preparation method, offered a flexible and diverse form of use, was nonpolluting, biodegradable, and reusable, and could have a wider application in the field of environmental pollutant removal and adsorption.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Boyi Yan,Zhongqiao Sun,Yide Han,Hao Meng,Xia Zhang
The construction of a tightly contacted heterojunction consisting of multi-components is proven to be one of the effective strategies to promote the photogenerated charges separation and to develop high-efficient photocatalysts in hydrogen evolution . Herein, a ternary hollow heterostructure of ZnS/ZIS/In 2 S 3 has been fabricated by using a binary MOF@MOF (ZIF-8@MIL-68(In)) as the precursor, and an in-situ sulfurization of ZIF-8@MIL-68(In) is controlled to optimize the photocatalytic performances. The resulting samples are signed as Z@M- t , where the t is pointed to the sulfurization time being varied from 4 h to 48 h. It’s shown that the hierarchical and hollow architecture is formed for Z@M- t , and with the reinforced light harvest ability in both UV and visible light regions. In the subsequent visible-light-induced photocatalytic hydrogen generation, the optimized Z@M-24 manifests significantly improved hydrogen evolution rate of 607.34 μmol g -1 h −1 , which values are evidently higher than that by the single MOF and binary ZIF-8@MIL-68(In) heterostructure. The electrochemical analyses and the electron paramagnetic resonance (EPR) spectrum were analyzed to clarify the charge transfer routes and the enhanced photocatalytic mechanism, in which the contribution of each metal sulfide is also discussed. Finally, the good photocatalytic stability and reusability of Z@M-24 heterostructure are also represented, which define the structure superior brought by the effective heterojunction based on the in-situ sulfurization strategy of binary ZIF-8@MIL-68(In), and determine their prospect applications in the efficient H 2 production under visible light irradiation.
研究领域:
材料科学
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化学
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光催化
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纳米技术
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Fenfen Jing,Ruowen Liang,Jinhua Xiong,Rui Chen,Shiying Zhang,Yanhua Li,Ling Wu
A highly effective Iron Metal-Framework photocatalyst (MIL-68(Fe)) has been successfully prepared via a facile solvothermal method under acidic condition. The UV–vis diffuse reflectance spectrum reveals that the absorption edge of MIL-68(Fe) is 440 nm. The flat-band potential of MIL-68(Fe) is −0.6 V vs. NHE at pH = 6.8, which is more negative than the redox potential of Cr(VI)/Cr(III) (+0.51 V, pH = 6.8). Consequently, it is thermodynamically permissible for the transformation of photogenerated electrons to the Cr(VI) to produce Cr(III). Moreover, MIL-68(Fe) could perform as an efficient photocatalyst towards the reduction of Cr(VI) aqueous with a wide pH range. After 5 min of visible light illumination (λ > 420 nm), almost 100% Cr(VI) can convert to Cr(III) with (NH 4 ) 2 C 2 O 4 as a scavenger (pH = 3), which is also higher than that of N-doped TiO 2 (50%) and ZnO (7.6%) under identical conditions. Furthermore, MIL-68(Fe) is proved to perform as a highly efficient photocatalyst for remove of different aqueous contaminant with malachite green (MG) as a scavenger. Finally, a possible reaction mechanism has also been investigated in detail.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Wei Zhao,Mengru Yan,Xinran Yang,Xiaojun Zeng,Yantong Chen,Benlin Dai,Xiaozhong Chu,Xuekun Hong,Feihu Mu,Shijie Li,Dennis Y.C. Leung
Environmental pollution caused by the overusage and uncontrolled discharge of antibiotics such as amoxicillin will endanger public health and ecosystems. Herein, a novel Ag/MIL-68(In)-NH 2 /Bi 4 O 7 plasmonic heterojunction has been successfully prepared through a two-step route followed by photoreduction for environmentally friendly photocatalytic amoxicillin degradation. Ag/MIL-68(In)-NH 2 /Bi 4 O 7 displayed the most efficient photocatalytic performance, which was 3.7 and 3.2 times that of Bi 4 O 7 and MIL-68(In)-NH 2 , respectively. The superior photocatalytic activity was directly linked to its large surface area and localized surface plasmon resonance (LSPR) effect, which provides more active sites and effectively promotes visible light absorption. Moreover, the degradation path of amoxicillin was explored in detail by combining Gaussian software calculation with liquid chromatography-mass spectrometry (LC-MS) analysis. Finally, a series of characterizations and simulations were carried out to demonstrate the S-scheme photocatalytic mechanism.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Yuanming Tan,Zhongqiao Sun,Hao Meng,Yide Han,Junbiao Wu,Junli Xu,Yan Xu,Xia Zhang
MOFs/polymer hybrid membranes combine the special surface activity of MOFs and the excellent carries nature of porous polymer and thus exhibit unexpected adsorption/separation performances in the solid-phase extraction. In this paper, a new kind of MOFs/polymer composite membrane , MIL-68(Al)/PVDF have been fabricated for the first time through blending the MIL-68(Al) nanoparticles and polyvinylidene fluoride (PVDF) casting solution and following the lyotropic phase transition. Some means such as SEM, XRD and FT-IR are used to character the structure of these hybrid membranes. The membrane performances including the hydrophilic/hydrophobic properties, membrane porosity and membrane water flux are also measured. The effects of doping amount of MIL-68(Al) on the structure and performances of MIL-68(Al)/PVDF hybrid membranes are discussed. Two persistent organic pollutants : p -nitrophenol (PNP) and methylene blue (MB) are chosen as main adsorption objects to evaluate the adsorption activity of MIL-68(Al)/PVDF hybrid membranes. The influences of various conditions on the adsorption activities are investigated in detail and the optimum adsorption conditions are determined. All the MIL-68(Al)/PVDF hybrid membranes exhibit enhanced adsorption capacity compared to pristine PVDF, and the adsorption activities of hybrid membranes are promoted continually with the increasing doping contents of MIL-68(Al). The adsorption thermodynamics analysis indicates that the adsorption process is mainly characterized by Langmuir monolayer adsorption and chemical adsorption . The coordination bonding formed between NO 2 of PNP and Al(III) of MIL-68(Al), and the acid-base interaction between the sulfur of MB and Al(III) of MIL-68(Al) may be responsible to the highest removal efficiency of PNP and MB. The good dynamics adsorption and regeneration performances indicate the prospect applications of these MOFs/PVDF hybrid membranes in the separation of organic contaminants from industrial waste water.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 2
·1017-1034
·
IF 6.123
Sun Lijian,Qian Xueren,An Xianhui
Cellulose-based bioplastics with degradability and remarkable mechanical performance have recently attracted increasing attention. As a high-performance material, cellulose-based bioplastics have a strong potential to replace synthetic plastic substrates in many applications. However, its poor shielding performance to UV light limit its application. In this work, transparent and UV-blocking MIL-68(In)-NH 2 @cellulose bioplastic (M(In)CBP) sheets are fabricated via a featured processing method, i.e., cellulose liquefaction, rapid solidification, in-situ synthesis and hot-press drying. The as-obtained functional bioplastic sheet (M(In)CBP1) exhibits high visible-light transparence (74.7% a 600 nm) and the existence of MIL-68(In)-NH 2 allows superior UV-blocking ability (below 400 nm, transmittance was under 4%). The M(In)CBP sheets show high photostability even after continuous UV irradiation (365 nm) for over 12 h. The superior UV-shielding performance is attributed to the uniform distribution and the high UV absorbance of MIL-68(In)-NH 2 in M(In)CBP sheets. High resistance to penetration by aqueous/nonaqueous liquids was proved. Moreover, the M(In)CBP sheets also show excellent mechanical properties and thermal stability. The present work designed a UV-blocking bioplastic constructed from cellulose and MIL-68(In)-NH 2 , which is potential candidates to replace synthetic plastics in many advanced applications such as a UV protection layer for electronic products, or useful as packaging materials to prevent food spoilage. Graphical abstract
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiamin Wei,Qing Wang,Mian He,Shuai Li,Yunan Zhang,Yang Yang,Shipeng Luo,Lianshe Fu,Xin Wang,Tinghai Yang
The development of highly efficient strategy to facilitate comprehensive charge transmission and effective spatial charge separation is expected as a promising approach to improve photocatalytic performance. Herein, the Fe(III) doping modified AgI/NH 2 -MIL-68(In/Fe) Z-scheme heterojunction (ANM-x composite) with unique internal and interfacial charge transmission performance was fabricated by a facile ion exchange precipitation method. The optimized ANM-50 composite exhibits the maximum photocatalytic activity for the degradation of tetracycline, which is about 9.54, 2.61 and 1.86 times higher than that of pure NH 2 -MIL-68In, NH 2 -MIL-68(In/Fe) and AgI, respectively. The characterization results displayed that Ag nanoparticles (NPs) were generated during the photocatalytic procedure, which not only served as a charge transfer-highway, but also reduced the charge flow energy barrier, thereby accelerating charge transfer efficiency and consolidating the stability of the Z-scheme heterojunction. Mechanism exploration reflected that the superior photocatalytic performance was associated with synergetic effect among the introduced Fe(III), constructed ANM Z-scheme heterojunction and the generated Ag NPs, which significantly expands visible light response range and promotes more effective internal and interfacial charge separation. This research not only designs an efficient photocatalyst for decomposing tetracycline, but also opens a new perspective for rational developing Z-scheme heterojunction with unique internal and interfacial charge flow steering.
研究领域:
材料科学
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环境科学
·
化学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）