Bismuth Oxyhalides for NOx Degradation under Visible Light: The Role of the Chloride Precursor

Catalysts

DariaC. Boffito¹  Federico Galli¹  Dalma Schieppati¹  Francesco Demartin²  Francesca Tessore²  ClaudiaL. Bianchi²  Giuseppina Cerrato³  Alessandro Di Michele⁴ 

[1] Chemical Engineering Department, Polytechnique Montréal, C.P. 6079, Succ. Centre-Ville, Montréal, QC H3C 3A7, Canada;Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133 Milano, Italy;Dipartimento di Chimica, Università degli Studi di Torino, via Pietro Giuria 7, 10125 Torino, Italy;Dipartimento di Fisica e Geologia, Università degli Studi di Perugia, Via Pascoli, 06123 Perugia, Italy;

关键词: Keywords: photocatalysis;    NOx degradation;    bismuth oxyhalides;    cetylpyridinium chloride;    cetyltrimethylammonium bromide;   

DOI  :  10.3390/catal11010081

来源: DOAJ

【 摘 要 】

Photocatalysis is a green technology for tackling water and air contamination. A valid alternative to the most exploited photocatalytic material, TiO₂, is bismuth oxyhalides, which feature a wider bandgap energy range and use visible radiation to attain photoexcitation. Moreover, their layered structure favors the separation of photogenerated electron–hole pairs, with an enhancement in photocatalytic activity. Controlled doping of bismuth oxyhalides with metallic bismuth nanoparticles allows for further boosting of the performance of the material. In the present work, we synthesized Y%Bi-doped BiO(Cl₀.₈₇₅Br₀.₁₂₅) (Y = 0.85, 1, 2, 10) photocatalysts, using cetyltrimethylammonium bromide as the bromide source and varying the chloride source to assess the impact that both length and branching of the hydrocarbon chain might have on the framing and layering of the material. A change in the amount of the reducing agent NaBH₄ allowed tuning of the percentage of metallic bismuth. After a thorough characterization (XRPD, SEM, TEM, UV-DRS, XPS), the photocatalytic activity of the catalysts was tested in the degradation of NOx under visible light, reaching a remarkable 53% conversion after 3 h of illumination for the material prepared using cetylpyridinium chloride.

【 授权许可】

Unknown