Integrating hollow spherical covalent organic frameworks on NH₂–MIL-101(Fe) as high performance heterogeneous photocatalysts

Abstract

A novel metal-organic frameworks@porous organic polymers (MOF@POPs) heter junction, i.e., NH2-MIL-101(Fe)@SNW-1 (MS-x), was synthesized based on the post-synthetic covalent modification. In the present work, aldehyde-modified MOFs (NH2-MIL-101(Fe)) were covalently bonded...

Construction of a direct Z-scheme CeO2/UiO-66-NH2 heterojunction for boosting photocatalytic organic pollutant degradation and H2 evolution performance

“…Furthermore, the LUMO potential of UiO-66-NH 2 is more negative than that of O 2 /˙O 2− (−0.33 eV per NHE), which is beneficial for the reduction of O 2 to ˙O 2− and reduced H + into H 2 . 43 Meanwhile, the VB of CeO 2 (2.47 eV per NHE) had more positive potential compared to OH-/˙OH (2.4 eV per NHE). 44 It can oxidize the hydroxyl ion to the hydroxyl radical, which can further react with TC and DCP molecules.…”

Nanoarchitectonics of Hollow Covalent Organic Frameworks: Synthesis and Applications

“…Notably, compared with those of bulk COFs, these hollow COFs have demonstrated enhanced photocatalytic activities in photocatalytic hydrogen evolution, 22,39,72,94,95 CO 2 conversion, 38,96−98 oxidation, 37 and degradation of environmental contaminants. 19,46,85,95,99 In a pioneering work, Zhang et al reported the synthesis of two hollow nanoporous covalent triazine frameworks (CTFs) with varying chemical compositions through a templateassisted method. 19 Because of the highly ordered hollow interconnected pores, the resulting material exhibited a much better photocatalytic activity in the reduction of 4-nitrophenol than that of a bulk COF.…”

“…In another work, Cheng et al explored a MOF@COF composite, termed NH 2 −MIL101(Fe)@SNW-1. 95 Because of the coexistence of Lewis acid sites from the Fe clusters in NH 2 −MIL-101(Fe) and Brønsted base sites from the aminal groups in SNW-1, the resulting MOF/COF composite exhibited high activity in the photodegradation of various pollutants and photocatalytic hydrogen evolution. Recently, Do et al presented the synthesis of a hollow nanospherical TpPa-1 through a hard template method.…”

“…It is capable of the ability to regulate the electron density and tune the polarity of the resulting materials. Currently, the introduction of organic functional moieties (such as −OH) and combination with other materials (such as metal ions, , MOFs, , metal sulfides, ,, and metal oxides) are two commonly used methods to construct heterojunctions. For instance, Lan et al developed a MOF-sacrificed in situ acid etching strategy to create heterojunctions .…”

“…Nanostructuring COFs, specifically those with hollow morphologies, such as spheres, ,, bowl, and capsule, have shown great potential in improving their photocatalytic performance. Notably, compared with those of bulk COFs, these hollow COFs have demonstrated enhanced photocatalytic activities in photocatalytic hydrogen evolution, ,,,, CO 2 conversion, ,− oxidation, and degradation of environmental contaminants. ,,,, …”