期刊
CHEMICAL ENGINEERING JOURNAL
卷 425, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131493
关键词
Ti3C2 MXene; Silver; Graphitic carbon nitride; Carriers separation; Tetracycline degradation
资金
- National Natural Science Foundation of China [22002146]
- Taishan Scholars Foundation of Shandong province [tsqn201909058]
- Fundamental Research Funds for the Central Universities [202013037]
In this study, a novel Ag/g-C3N4/Ti3C2 heterojunction was successfully synthesized via one-step calcination, with Ag nanoparticles and layered Ti3C2 playing roles in enhancing responsivity and accelerating charge transfer. The optimized heterojunction showed efficient removal of organic pollutants under visible light irradiation.
Novel Ag/g-C3N4/Ti3C2 heterojunction (ACN/TC) was synthesized via one-step calcining the mixture of Ag+-melamine superamolecule and Ti3C2. With robust interfacial contact of ACN/TC heterojunction, the introduction of Ag nanoparticles could induce localized surface plasmon resonance and improve the visible light responsivity. Besides, layered Ti3C2 was served as electron sink and co-catalyst to provide rapid charges transfer channel and enhance O-2 adsorption, thereby accelerating the separation of photogenerated charges and production of radicals. The optimized ternary heterojunction (ACN/TC-15) exhibited that the photocatalytic removal rate of Rhodamine B (RhB) and Tetracycline hydrochloride (TC) reached 99.2% and 92.1% under visible light (lambda > 420 nm) irradiation, respectively. Besides, extending to lambda > 510 nm light irradiation, the removal rate of RhB and TC still 85.6% and 79.5%, respectively. During the TC degradation, the superoxide radical (center dot O-2(-)) was determined as the main oxidative species. Besides, the possible degradation pathway of TC was proposed. This work not only showed a simplified method for the preparation of Ag/g-C3N4/Ti3C2 composite, but also provided insights into Ti3C2 MXene as co-catalyst to improve the photocatalytic degradation of organic pollutants.
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