Details

Autor(en) / Beteiligte

• Tang, Mengling
• Ao, Yanhui
• Wang, Chao
• Wang, Peifang

Titel

Rationally constructing of a novel dual Z-scheme composite photocatalyst with significantly enhanced performance for neonicotinoid degradation under visible light irradiation

Ist Teil von

• Applied catalysis. B, Environmental, 2020-08, Vol.270, p.118918, Article 118918

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A novel dual Z-scheme photocatalyst was rationally constructed via a two-step method (electrostatic self-assembly plus selective deposition). Firstly, binary g-C3N4/WO3 system was fabricated by electrostatic self-assembly method. Then, Ag ions were selectively adsorbed on the surface of negatively charged WO3 and reacted with I ions to form AgI nanoparticles. The as constructed composites showed significantly enhanced visible light responsive photocatalytic performance for nitenpyram (NTP) compared to pure g-C3N4, WO3, AgI and their binary composites. [Display omitted] •Mediator-free direct dual-Z-scheme g-C3N4/WO3/AgI hybrid photocatalysts were rationally constructed.•The photocatalyst was prepared by electrostatic self-assembly plus selective deposition method.•The photocatalyst exhibited high performance for the degradation of nitenpyram.•The rate constant improved by a factor of 12.4 and 21.8 compared to g-C3N4 and WO3.•A deductive degradation pathway of nitenpyram was proposed. A novel dual Z-scheme g-C3N4/WO3/AgI photocatalyst was rationally constructed via a two-step method (electrostatic self-assembly plus selective deposition). Firstly, binary g-C3N4/WO3 system was fabricated by electrostatic self-assembly method. Then, Ag ions were selectively adsorbed on the surface of negatively charged WO3 and reacted with I ions to form AgI nanoparticles. Compared with pure g-C3N4, WO3, AgI and their binary composites, the ternary composites showed significantly enhanced photocatalytic performance for nitenpyram (NTP) degradation under visible light. The enhanced performance can be ascribed to the increased charge transferring/separation efficiency and remaining high reduction/oxidation ability of the photo-generated electrons/holes in the dual Z-scheme system. Furthermore, the possible degradation pathway of NTP was deduced based on the results of high-performance liquid chromatography mass spectrometry (HPLC-MS). This work would broaden insight into the rationally construction of highly efficient Z-scheme composite photocatalysts.