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Gas adsorption and Fluorescent Sensing Properties of Three Metal-Organic Frameworks Based on 3,5-di(2’,5’-dicarboxylphenyl)benozoic Acid and Cadmium Ions
摘要： Three 3D Cd(Ⅱ) metal-organic frameworks(MOFs), namely, {[Cd3(L)(OH)(H2O)3]n·2H2O} (1), {Cd5(L)2(H2O)9}n (2) and {Cd2(L)(bib)(NH4)}n (3), have been synthesized based on H5L and cadmium ion under hydrothermal conditions (H5L = 3,5-di(2’,5’-dicarboxylpyl)benozoic acid, bib = 1,4-bis(1-imidazoly)benzene), and characterized by IR spectrum analysis, powder X-ray diffraction analysis (PXRD) and thermogravimetric analysis (TGA). X-ray single crystal diffraction analyses showed that complex 1 is a porous 3D 4-connected net with the point symbol of {4.65} with the trinuclear [Cd3(OH)(COO)5] SBUs, complex 2 displays a 3D framework 7-connected net with the point symbol of {33.412.55.6} with the pentanuclear [Cd5(COO)10(H2O)9] SBUs and complex 3 presents a porous 3D 4,6-connected net with the point symbol of {43.610.82}{43.63}. Furthermore, fluorescent measurements indicated that 1 and 2 have potential application in the detection for Fe3+, CrO4 2- and Cr2O7 2- ions in aqueous solution. Gas sorption properties exhibited that complex 1 has better hydrogen storage performance.
关键词： Luminescent properties,3,Gas adsorption,5–di(2’,5’-dicarboxylphenyl)benozoic acid
更新于2025-09-23 15:23:52
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Prediction of Adsorption Probability of Oxidizing and Reducing Species on 2D Hybrid Junction of rGO-ZnO from First Principle Analysis
摘要： The target of this paper is to theoretically investigate the probability of gas (both oxidizing and reducing) adsorption on the van der Waals (vdW) heterojunction formed between p-type rGO and n-type 2D-ZnO, using density functional theory (DFT) based first principle calculation employing Virtual Nanolab (VNL) Atomistix Toolkit (ATK) (v2016.4). Two types of heterostructures are considered viz. heterostructure type-1 where hydroxyl group (sp2) is at the edge of the reduced graphene oxide (rGO) and heterostructure type-2 where hydroxyl group (sp3) is perpendicular to the plane of rGO. Adsorption energy, charge transfer and the distance of the nearest atom from the adsorbent are calculated for oxidizing (NO2 as the test case) and reducing (NH3 as the test case) species and compared with that of Oxygen on rGO/2D-ZnO heterostructures as well as on its individual constituent (rGO nanoflakes and 2D-ZnO, separately). Like 2D-ZnO, heterostructure type-1 was also found to be selective towards NO2 with almost three times and five times higher adsorption energy than that of 2D-ZnO and rGO, respectively. On the other hand, it was found that charge distribution in the underlying 2D-ZnO of heterostructure type-2 remained almost unaltered even after gas adsorption and therefore lead to insignificant improvement compared to its 2D-ZnO counterpart.
关键词： gas adsorption probability,charge transfer,van der Waals heterostructure,Density functional theory,rGO-ZnO hybrid system
更新于2025-09-04 15:30:14