scholarly journals Water Photo-Electrooxidation Using Mats of TiO2 Nanorods, Surface Sensitized by a Metal–Organic Framework of Nickel and 1,2-Benzene Dicarboxylic Acid

Hydrogen ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 58-75
Author(s):  
Sheng-Mu You ◽  
Waleed M. A. El Rouby ◽  
Loïc Assaud ◽  
Ruey-An Doong ◽  
Pierre Millet
Keyword(s):  
Dicarboxylic Acid ◽  
Electrochemical Impedance ◽  
Metal Organic Framework ◽  
Linear Sweep Voltammetry ◽  
Tio2 Nanorods ◽  
Tem Analysis ◽  
Vis Spectroscopy ◽  
Metal Organic ◽  
Benzene Dicarboxylic Acid ◽  
Organic Framework

Photoanodes comprising a transparent glass substrate coated with a thin conductive film of fluorine-doped tin oxide (FTO) and a thin layer of a photoactive phase have been fabricated and tested with regard to the photo-electro-oxidation of water into molecular oxygen. The photoactive layer was made of a mat of TiO2 nanorods (TDNRs) of micrometric thickness. Individual nanorods were successfully photosensitized with nanoparticles of a metal–organic framework (MOF) of nickel and 1,2-benzene dicarboxylic acid (BDCA). Detailed microstructural information was obtained from SEM and TEM analysis. The chemical composition of the active layer was determined by XRD, XPS and FTIR analysis. Optical properties were determined by UV–Vis spectroscopy. The water photooxidation activity was evaluated by linear sweep voltammetry and the robustness was assessed by chrono-amperometry. The OER (oxygen evolution reaction) photo-activity of these photoelectrodes was found to be directly related to the amount of MOF deposited on the TiO2 nanorods, and was therefore maximized by adjusting the MOF content. The microscopic reaction mechanism which controls the photoactivity of these photoelectrodes was analyzed by photo-electrochemical impedance spectroscopy. Microscopic rate parameters are reported. These results contribute to the development and characterization of MOF-sensitized OER photoanodes.

scholarly journals Metal–organic frameworks constructed from crown ether-based 1,4-benzenedicarboxylic acid derivatives

2016 ◽  
Vol 45 (7) ◽  
pp. 3063-3069 ◽  
Author(s):  
Teng-Hao Chen ◽  
Andreas Schneemann ◽  
Roland A. Fischer ◽  
Seth M. Cohen
Keyword(s):  
Crown Ether ◽  
Dicarboxylic Acid ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Thiacrown Ether ◽  
Benzenedicarboxylic Acid ◽  
Metal Organic ◽  
Benzene Dicarboxylic Acid ◽  
Organic Framework

A series of crown ether- and thiacrown ether-derivatized benzene dicarboxylic acid (H2bdc) ligands has been synthesized and incorporated into the prototypical isoreticular metal–organic framework (IRMOF) and UiO-66 materials.

scholarly journals Construction of Silver Quantum Dot Immobilized Zn-MOF-8 Composite for Electrochemical Sensing of 2,4-Dinitrotoluene

2019 ◽  
Vol 9 (22) ◽  
pp. 4952 ◽  
Author(s):  
Sushma Rani ◽  
Bharti Sharma ◽  
Shivani Kapoor ◽  
Rajesh Malhotra ◽  
Rajender S. Varma ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Limit Of Detection ◽  
Metal Organic Framework ◽  
Linear Sweep Voltammetry ◽  
Electrochemical Sensing ◽  
Amperometric Determination ◽  
Transmission Electron ◽  
Electro Catalysis ◽  
Metal Organic ◽  
Organic Framework

In the present study, we report a highly effective electrochemical sensor for detecting 2,4-dinitrotoluene (2,4-DNT). The amperometric determination of 2,4-DNT was carried out using a gold electrode modified with zinc–metal organic framework-8 and silver quantum dot (Zn-MOF-8@AgQDs) composite. The synthesized nanomaterials were characterized by using transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and X-ray powder diffraction (XRD). The synthesized nanocomposite proved to be efficient in electro-catalysis thereby reducing the 2,4-DNT. The unique combination present in Zn-MOF-8@AgQDs composite offered an excellent conductivity and large surface area enabling the fabrication of a highly sensitive (−0.238 µA µM−1 cm−2), selective, rapid and stable 2,4-DNT sensor. The dynamic linear range and limit of detection (LOD) was about 0.0002 µM to 0.9 µM and 0.041 µM, respectively. A 2,4-DNT reduction was also observed during the linear sweep voltammetry (LSV) experiments with reduction peaks at −0.49 V and −0.68 V. This is an unprecedented report with metal organic framework (MOF) composite for sensing 2,4-DNT. In addition, the presence of other species such as thiourea, urea, ammonia, glucose, and ascorbic acid displayed no interference in the modified electrode suggesting its practicability in various environmental applications.

A fluorescent zirconium organic framework displaying rapid and nanomolar level detection of Hg(II) and nitroantibiotics

2022 ◽  
Author(s):  
Subhrajyoti Ghosh ◽  
Felix Steinke ◽  
Abhijeet Rana ◽  
Shyam Biswas
Keyword(s):  
Acetic Acid ◽  
Dicarboxylic Acid ◽  
Metal Organic Framework ◽  
Solvothermal Reaction ◽  
Metal Organic ◽  
Organic Framework

The solvothermal reaction of ZrCl4 with benzo[1,2-b:4,5-b’]dithiophene-2,6-dicarboxylic acid linker molecule in presence of trifluoro acetic acid modulator afforded the UiO-66 type of metal organic framework (MOF) (IITG-5, IITG = Indian...

A porous anionic zinc(II) metal-organic framework for gas adsorption, selective uptake of dyes and sensing of Fe3+ by Tb3+ ion encapsulation

CrystEngComm ◽  
2021 ◽  
Author(s):  
Yu-Jie Liang ◽  
Jun Yao ◽  
Ming Deng ◽  
Yan-E Liu ◽  
Quan-Qing Xu ◽  
...  
Keyword(s):  
Dicarboxylic Acid ◽  
Gas Adsorption ◽  
Metal Organic Framework ◽  
Three Dimensional ◽  
Selective Uptake ◽  
Mixed Ligands ◽  
Metal Organic ◽  
Dicarboxylate Ligand ◽  
Organic Framework

A three-dimensional (3D) metal-organic framework [(CH3)2NH2][Zn2(DMTDC)2(3-mtz)]•4DMF•3H2O (Zn-MOF) has been solvothermally synthesized by using mixed ligands of 3-methyl-1,2,4-triazole (3-Hmtz) and a thiophene-functionalized dicarboxylate ligand, 3,4-dimethylthieno[2,3-b]thiophene-2,5-dicarboxylic acid (H2DMTDC). Zn-MOF exhibits a uninodal...

Facile synthesis of nickel-based metal organic framework [Ni3(HCOO)6] by microwave method and application for supercapacitor

2018 ◽  
Vol 11 (02) ◽  
pp. 1850030 ◽  
Author(s):  
Jujie Luo ◽  
Xing Yang ◽  
Shumin Wang ◽  
Yuhong Bi ◽  
Amit Nautiyal ◽  
...  
Keyword(s):  
Electrochemical Impedance ◽  
Metal Organic Framework ◽  
Microwave Method ◽  
X Ray Diffraction ◽  
Galvanostatic Charge ◽  
Facile Synthesis ◽  
X Ray ◽  
Irradiation Power ◽  
Metal Organic ◽  
Organic Framework

The metal organic framework (MOF) [Ni3(HCOO)6] was synthesized via the simple and fast microwave method, and the effect of irradiation power on crystallinity of synthesized Ni-based MOF was studied. The samples were characterized by using Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The synthesized Ni-based MOF was electrochemically characterized by using galvanostatic charge–discharge (GCD), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) techniques. The synthesized MOF showed the highest specific capacitance of 1196.2[Formula: see text]F/g at 1[Formula: see text]A/g with excellent cyclability (86.04% capacitance retention after 2,000 cycles), thereby demonstrating its potential application in supercapacitors.

scholarly journals Zn(II) Metal-organic Framework Nanoparticles: Synthesis, Characterization and Application as Optical Biosensor for Prostate-Specific Antigen

2021 ◽  
Author(s):  
Amal S. Basaleh ◽  
S. M. El-Sheikh
Keyword(s):  
Prostate Specific Antigen ◽  
Metal Organic Framework ◽  
Specific Antigen ◽  
Interaction Mechanism ◽  
Optical Biosensor ◽  
Human Beings ◽  
Vis Spectroscopy ◽  
Metal Organic ◽  
Ft Ir ◽  
Organic Framework

Abstract PSA, abbreviated of “Prostate-Specific Antigen” is widely used as a considered a significant cancer biomarker for diagnosing prostate cancer. Improvement of a fast, facile, and less cost with high accurate/sensitive/selective methodologies for the PSA determination is stock-still a challenge. In this work, we reported a simple biosensor based on a Zn(II) metal-organic framework nanoparticles (Zn-MOF-NPs) derived from reaction of zinc acetate with nano organic linker. The structure, morphology, and physicochemical properties of the prepared Zn(II)-MOF-NPs were definite using various spectroscopic and microanalytical tools as SEM-EDX, HR-TEM, XRD, XPS, elemental analysis, FT-IR, UV-vis spectroscopy, mass spectroscopy, thermogravimetric Analysis (DSC/TGA), and photoluminescence (PL). Obviously, the results revealed that the Zn(II)-MOF-NPs is chemical stable, highly selective and sensitive to PSA, without interferences with other common interfering analytes. The detection limit for PSA was 0.145 fg/mL, in a wide-linear range of concentrations (0.1 fg/mL-20 pg/mL), with a correlation coefficient 0.983. The Zn(II)-MOF-NPs was successfully used as an up-and-coming biosensor for PSA-monitoring and quantification in biological real samples (plasma/whole blood/serum) at clinical target concentration levels. Moreover, the present approach will help the human-beings from the hazard’s prostatic cancer through early discovery and diagnosis process via the detection of PSA at low limits of concentrations. Meantime, the interaction mechanism between the Zn(II)-MOF-NPs and PSA was well studied and investigated.

scholarly journals Electrochemical micro analytical device interfaced with portable potentiostat for rapid detection of chlorpyrifos using acetylcholinesterase conjugated metal organic framework using Internet of things

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Shalini Nagabooshanam ◽  
Souradeep Roy ◽  
Ashish Mathur ◽  
Irani Mukherjee ◽  
Satheesh Krishnamurthy ◽  
...  
Keyword(s):  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
Low Cost ◽  
Metal Organic Framework ◽  
Electrochemical Techniques ◽  
Electrochemical Analysis ◽  
Vegetable Sample ◽  
Metal Organic ◽  
Analytical Device ◽  
Organic Framework

AbstractAn Electrochemical micro Analytical Device (EµAD) was fabricated for sensitive detection of organophosphate pesticide chlorpyrifos in the food chain. Gold microelectrode (µE) modified with Zinc based Metal Organic Framework (MOF-Basolite Z1200) and Acetylcholinesterase (AChE) enzyme served as an excellent electro-analytical transducer for the detection of chlorpyrifos. Electrochemical techniques such as Cyclic Voltammetry (CV), Electrochemical Impedance Spectroscopy (EIS) and Differential Pulse Voltammetry (DPV) were performed for electrochemical analysis of the developed EµAD. The sensor needs only 2 µL of the analyte and it was tested within the linear range of 10 to 100 ng/L. The developed EµAD’s limit of detection (LoD) and sensitivity is 6 ng/L and 0.598 µ A/ng L−1/mm2 respectively. The applicability of the device for the detection of chlorpyrifos from the real vegetable sample was also tested within the range specified. The fabricated sensor showed good stability with a shelf-life of 20 days. The EµAD’s response time is of 50 s, including an incubation time of 20 s. The developed EµAD was also integrated with commercially available low-cost, handheld potentiostat (k-Stat) using Bluetooth and the results were comparable with a standard electrochemical workstation.

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