Construction of novel MoS₂@COF-Ph heterojunction photocatalysts for boosted photocatalytic efficiency and hydrogen production performance under sunlight

Abstract

Heterojunction photocatalysts have been regarded as effective materials for photocatalysis. In this paper, because of peculiar structure and characteristics of covalent organic frameworks(COFs), a novel nano-MoS2@COF-Ph heterojunction photocatalyst was...

In2O3 Nanoparticle/Bi4O5Br2 Nanosheet S-Scheme Heterojunctions with Interfacial Oxygen Vacancies for Photocatalytic Degradation of Tetracycline

“…Antibiotics are increasingly employed in human society as industrialization advances. , Tetracycline hydrochloride (TCH), a broad-spectrum antibiotic with phenanthrene nucleus, is widely used to treat bacterial infections in humans and to promote the growth of animals as an animal-feed additive . However, due to overuse and inappropriate emissions, the continuous accumulation of TCH in natural water bodies poses a significant hazard to the biological environment and human health .…”

A novel molecularly expanded covalent triazine framework heterojunction with significantly enhanced molecular oxygen activation and photocatalysis performance under visible light

“…As shown in Scheme 2(b), when CTF-1-G and WS 2 combine to construct the heterojunction, both CTF-1-G and WS 2 can be excited to produce photogenerated electrons and holes under visible light irradiation (eqn (2)); meanwhile, the holes in the VB of WS 2 recombine with the electrons in the CB of CTF-1-G. Z-type charge migration resulted in strong reducing electrons accumulating in the CB of WS 2 (−0.78 eV), and strong oxidation holes were retained in the VB of CTF-1-G (2.18 eV). Thus, the electrons in the CB of WS 2 can react with dissolved oxygen molecules in aqueous solution to generate ˙O 2 − (eqn (3)), 41 which was further reduced to H 2 O 2 and ˙OH (eqn (4) and (5)). 14,18,56,57 In contrast, the h + in the VB of CTF-1-G cannot oxidize OH − , further evidence that the ˙OH in ESR was from the multi-step conversion of ˙O 2 − (eqn (5)).…”

“…38,39 Since Yaghi's discovery of boronic acid bonded COFs in 2005, 40 a number of COFs have been designed with triazine, imine and double bond structures. 41,42 Covalent triazine frameworks (CTFs) belong to a class of COFs that contain aromatic rings connected with triazine rings. Due to the presence of the CvN-bond, CTFs exhibit high thermal and chemical stabilities.…”

Covalent Organic Frameworks Based Heterostructure in Solar‐To‐Fuel Conversion

“…In a recent work in 2022, an innovative nano‐MoS 2 @COF‐Ph was prepared by in situ hydrothermal synthesis of MoS 2 nanospheres from the Mo & S precursors with the as‐synthesized COF. [ 67 ] The charge separation in a Z‐Scheme pathway was further enhanced as a cooperation of the π ‐conjugation system of the COF and the special configuration of the heterostructure. The heterostructure shows a photocatalytic HER activity of 7.2519 mmol h −1 g −1 after content optimization, under irradiation of λ > 420 nm visible light.…”