ZnAl–LDH/MOF-5 heterostructure nanocomposite for photocatalytic degradation of organic dyes under sunlight irradiation

Abstract

Layered double hydroxides-based metal organic framework-5 (LDHs/MOF-5) nanocomposites are synthesized by in-situ nucleation and directed growth of MOF-5 crystals on LDHs layers. The intercalated benzene dicarboxylate (BDC) ions of the...

Strong Host–Guest Dependence on the Emissive Properties of MOF-5 and [Zn2(BTTB)(DMF)2•(H2O)3]n

“…A closer look at why this is so, the main reason stems from a very small value of ε, which renders the J overlap integrals of the Forster and Dexter theories small, not to say negligible. This outcome (i.e., no or very low number of exciton hopping across the networks) indicates that the rich photocatalytic activity mentioned above ,,− ,,− ,− is not aided by the excitation energy migration. Therefore, the interior of the particles or nanoparticles does not contribute by the so-called antenna effect to the photochemical transformations that may occur at the surface of these porous objects.…”

“…Despite the rich photocatalytic properties of MOF-5 , ,,− ,,− ,− it is quite surprising that no S 1 –S 1 annihilation occurs. This result indicates that there no noticeable excitation energy migration across both MOF-5 ’s and MOF-D ’s scaffolding.…”

“…Metal–organic frameworks (MOFs) are known to exhibit rich heterogeneous excited-state-driven catalytic activity, and the semiconducting and emissive MOF-5 (3D-[ Zn 4 O­( 1,4-BDC ) 3 ] n ) (BDC = 1,4 - benzodicarboxylate) has been found to make no exception over the past several years. Indeed, semiconductor@ MOF-5 composites have become notorious for various photocatalytic applications such as H 2 -production, − O 2 -evolution, degradation of toxic organics and pollutants, − bacterial inactivation, − Cr­(VI)-reduction, and organic reactions , and pesticides .…”

MXenes and Clay Minerals in the Framework of the 2D Organic–Inorganic Hybrid Nanomaterials

“…The resulting ZnAl-LDH/MOF-5 hybrid exhibits an excellent dye removal efficiency under natural sunlight-mediated photodegradation processes. 100 The clay mineral sepiolite with abundant external �Si−OH groups that could act as MOF anchor points during their synthesis 91 appears as an attractive support for these compounds (E. Ruiz-Hitzky and F.M. Fernandes, 2011, unpublished results).…”

“…In the case of the LDH, where the layers are positively charged, contrarily to clay silicates (sometimes LDH received the name of “anionic clays”), the strategy adopted for the preparation of the corresponding hybrids is completely different as it consists in the in situ synthesis of MOF-5 by reaction of intercalated benzene dicarboxylate (BDC) ions of ZnAl-LDH structures coordinating Zn 2+ cations (Figure a,b). The resulting ZnAl-LDH/MOF-5 hybrid exhibits an excellent dye removal efficiency under natural sunlight-mediated photodegradation processes …”