A Novel Method for the Synthesis of MOF-199 for Sensing and Photocatalytic Applications

Abstract

Multifunctional Cu (II)-based Metal Organic Framework (MOF) [Cu 3 (BTC) 2 ] has been synthesized by a facile electrochemical method. Crystallographic and morphological characterizations of synthesized MOF have been done using Powder X-ray Diffractometer and Scanning Electron Microscope (SEM), respectively, whereas Fourier Transform Infrared Spectroscopy (FT-IR), Energy Dispersive X-ray Spectroscopy (EDS), UV-Vis Absorption Spectroscopy and Energy Resolved Luminescence Spectroscopic studies have been used for the detailed qualitative, quantitative as well as optical analyses. Sharp PXRD peaks indicate the formation of highly crystalline MOF with face centered cubic (fcc) structure. Flakes (average length = 0.71µm and width = 0.10 µm) and rods (average aspect ratio = ((0.1:8.3) µm) like morphologies have been observed in SEM micrographs. The presence of C, O and Cu has been con rmed by EDS analysis. Photocatalytic activity potential of the synthesized MOF has been tested using methylene blue dye (MB) as a test contaminant in aqueous media under sunlight irradiation. Selective and sensitive uorescent sensing of different Nitroaromatic compounds (NACs) like 4-Nitroaniline (4-NA), 2-Nitroaniline (2-NA), 3-Nitroaniline (3-NA), 4-Nitrotoulene (4-NT), 2,4-Dinitrotoulene (2,4-DNT), 1,3-Dinitrobenzene (1,3-DNB), 2,6-Dinitrotoulene (2,6-DNT) has been done by exploring the photoluminescent behaviour of chemically stable Cu 3 (BTC) 2 . Synthesized MOF is extremely sensitive towards 4-NA, which is having PL quenching e ciency of 82.61% with highest quenching rate till reported. Indeed, a large quenching coe cient K SV = 34.02 x 10 − 7 M − 1 and correlation coe cient R 2 = 0.9962 in K SV plot have been elucidated with limit of detection (LOD) = 0.7544 ppb. The possible ways of luminescence quenching are successfully explained by the combination of Photoinduced Electron Transfer (PET) and Resonance Energy Transfer (RET) mechanisms. Additionally, the Density Functional Theory (DFT) calculations have been employed to support the experimental results. Cu 3 (BTC) 2 fully demonstrates the power of a multi component MOF, which provides a feasible pathway for the design of novel material towards fast responding luminescence sensing and photocatalytic degradation of pollutants.

Template-Free Synthesis and Multifunctional Application of Foam HKUST-1

“…Fourier transform infrared spectroscopy (FTIR) revealed the coordination of trimesate and Cu 2+ in HKUST-1, and the results were highly in line with the reported literature (Figure h). The absorption peak at 730 cm –1 was caused by the Cu ion cluster in the crystal with Cu–O stretching vibration; the absorption peaks from 1300 to 1700 cm –1 were the C–O vibrational peaks in the carboxylic acid functional group, where 1451 cm –1 was caused by the symmetric stretching vibration of OC–O, while the absorption peak at 1634 cm –1 was due to the OC–O asymmetric stretching vibration; the absorption peaks at 1374 and 1573 cm –1 are the CC vibrational peaks, indicating the intercalation of BTC into HKUST-1; the 3421 cm –1 wide absorption peak was an H–O stretching vibration peak, indicating the adsorption of a large number of water molecules by HKUST-1.…”

A stable and sensitive Au metal organic frameworks resonance Rayleigh scattering nanoprobe for detection of SO32– in food based on fuchsin addition reaction

“…RRS is a simple, rapid and sensitive spectral method, which has been used in the analysis of inorganic and organic substances, such as proteins, nucleic acids, inorganic ions and trace metals (6). Nanoparticles have excellent optical properties, and a series of new RRS methods have been developed based on their surface plasmon RRS effect (7)(8)(9)(10)(11). Silicate (SiO 3 2− ) and phosphate (PO (12).…”

“…RRS is a simple, rapid and sensitive spectral method, which has been used in the analysis of inorganic and organic substances, such as proteins, nucleic acids, inorganic ions and trace metals ( 6 ). Nanoparticles have excellent optical properties, and a series of new RRS methods have been developed based on their surface plasmon RRS effect ( 7 – 11 ). Silicate (SiO 3 2– ) and phosphate (PO 4 3– ) can react with ammonium molybdate to form silicomolybdate heteropoly acid (SiMo) and phosphomolybdate heteropoly acid (PMo), PMo decomposed by the addition of citric acid, and SiMo/PMo combined with N/Au co-doped carbon dots (CD N/Au ) show good RRS analytical properties.…”