Construction and Activity of an All‐Organic Heterojunction Photocatalyst Based on Melem and Pyromellitic Dianhydride

Abstract

The separation efficiency of photogenerated carriers in the g‐C3N4 system could be improved by the construction of all‐organic heterojunctions. However, g‐C3N4 has a large π–π conjugated plane that induces a low number of amino groups (−NH2), which are the sites of the heterojunction reaction with organic molecules. In this case, few heterojunction knots can be constructed, and the enhancement effect of the heterojunction cannot be fully displayed. In this study, an all‐organic heterojunction with PMDA is constructed with melem instead of g‐C3N4. Although the photocatalytic activity of melem is far below that of g‐C3N4, the photocatalytic activity of PI (the all‐organic heterojunction constructed with melem) is considerably higher than that of CP (the all‐organic heterojunction constructed with g‐C3N4). This result is attributed to melem that has more –NH2 groups to form more heterojunction knots, which can enable the effective transfer and separation of electron‐hole pairs. These new findings may shed light on the design of all‐organic heterojunction photocatalysts.

In situ preparation of a Bi2O2CO3/BiOI with 2D/2D p-n heterojunction photocatalyst for water purification under visible light

“…The binding energies of BOC/BoI-0.5 in terms of both the Bi 4f and O 1s orbitals are between those of BOC and BOI. This indicates that Bi 2 O 2 CO 3 /BiOI may have a heterojunction ( Li et al, 2022c ). For the carbon 1s spectrum ( Figure 2C ), the characteristic peak of BOC/BOI-0.5 at 284.8 eV corresponds to C-C bonds, and the other characteristic peak (289.1 eV) is from C-O=C ( Gao et al, 2021 ).…”

A new synthetic method: pyromellitic dianhydride preparation by Ni–Mo/ZrO2 catalytic oxidation

“…Pyromellitic dianhydride, also referred to as PMDA, is a vital aromatic compound in the production of high value-added fine chemicals. 1 PMDA is a versatile compound, used to create polybenzimidazole pyrrolidinone, plasticizers, and epoxy resin curing agents. 2,3 Additionally, it is utilized in the study of organic electrode materials.…”

CdS–SH/TiO2 Heterojunction Photocatalyst Significantly Improves Selectivity for C–O Bond Breaking in Lignin Models

“…The construction of heterojunctions using semiconductor materials with matching energy band structures is the most effective and widely used method to solve photogenerated charge recombination. − Kim introduced Ag + into CdS to obtain AgS/CdS nanocomposites. The Ag + exchange shifted the CdS Fermi energy level downward, and the photogenerated electrons efficiently migrated to the AgS/CdS surface to break the C β –O bond of the lignin model.…”