Novel multi-heterostructured Pt-BiOBr/TiO₂ nanotube arrays with remarkable visible-light photocatalytic performance and stability

Abstract

Unique multiple heterojunction of Pt-BiOBr/TiO₂ nanotube arrays (Pt-BiOBr/TNTAs) was achived by successively loading both Pt nanoparticles (NPs) and BiOBr nanoflkes (NFs) on surface of ordered and spaced TiO₂ nanotubes (NTs) using anodization followed by solvothermal and sequential chemical bath deposition (S-CBD) method. The fabricated Pt-BiOBr/TNTAs were fully characterized, and the photocatalytic (PC) activity and stability of Pt-BiOBr/TNTAs toward degradation of methyl orange (MO) under visible-light irradiation (λ>400 nm) were evaluated. The results reveal that multiple heterostructures of Pt/TiO₂, Pt/BiOBr and BiOBr/TiO₂ are constructed among TNTAs substrate, Pt NPs and BiOBr NFs, and the hybrid Pt-BiOBr/TNTAs catalyst exhibits remarkable visible-light PC activity, favourable reusability and long-term stability. The combined effect of several factors may contribute to the remarkable PC performance, including strong visible-light absorption by both Pt NPs and BiOBr NFs, lower recombination rate of photo-generated electrons and holes attributed to the multiple heterojunction, microstructures for facile light injection and adsorption as well as efficient mass transport, and larger specific surface area for enhancing light absorption, increasing the effective contact area between the absorbed dye molecules and catalyst and benefiting the molecule transport of reactants or products.

References

[1] BaiJ., ZhouB. X.. Chemical Reviews, 2014, 114: 10131

[2] GrimesC. A.. Journal of Materials Chemistry, 2007, 17: 1451

[3] MohamedA. E. R., RohaniS.. Energy & Environmental Science, 2011, 4: 1065

[4] XuB. L., LiuC. X., SunH. Y., ZhongY. R.. Optoelectronics Letters, 2014, 10: 84

[5] KumarS. G., DeviL. G.. Journal of Physical Chemistry A, 2011, 115: 13211

[6] ZhangK. L., LiuC. M., HuangF. Q., ZhengC., WangW. D.. Applied Catalysis B: Environmental, 2006, 68: 125

[7] ChengH. F., HuangB. B., DaiY.. Nanoscale, 2014, 6: 2009

[8] HuJ. J., LiuJ. Q., RuanL. L., BianH. D., ZhangX. Y., WuY. C.. Optoelectronics Letters, 2015, 11: 5

[9] LiuJ. Q., AdelojuS. B., WuY. C.. Dalton Transactions, 2014, 43: 1706

[10] RuanL. L., LiuJ. Q., ZhouQ., HuJ. J., XuG. Q., ShuX., WuY. C.. New Journal of Chemistry, 2014, 38: 2506

[11] ChengH. F., HuangB. B., WangP., WangZ. Y., LouZ. Z., WangJ. P., QinX. Y., ZhangX. Y., DaiY.. Chemical Communications, 2011, 47: 7054

[12] FranciscoM. S. P., MastelaroV. R., NascenteP. A. P., FlorentinoA. O.. Journal of Physical Chemistry B, 2001, 105: 10515

[13] SiuzdakK., SzkodaM., SawczakaM., Lisowska-OleksiakbA.. New Journal of Chemistry, 2015, 39: 2741

[14] TanX. L., FanQ. H., WangX. K., GrambowB.. Environmental Science & Technology, 2009, 43: 3115

[15] ZhengZ. K., HuangB. B., QinX. Y., ZhangX. Y., DaiY., WhangboM. H.. Journal of Materials Chemistry, 2011, 21: 9079

[16] XiaJ. X., YinS., LiH. M., XuH., XuL., XuY. G.. Dalton Transactions, 2011, 40: 5249

[17] BianH. D., ShuX., ZhangJ. F., YuanB., WangY., LiuL. J., XuG. Q., ChenZ., WuY. C.. Chemistry-An Asian Journal, 2013, 8: 2746

[18] TanakaA., HashimotoK., KominamiH.. Journal of the American Chemical Society, 2014, 136: 586

[19] LeeY. L., LoY. S.. Advanced Functional Materials, 2009, 19: 604

[20] YuC. L., CaoF. F., LiG., WeiR. F., YuJ. C., JinR. C., FanQ. Z., WangC. Y.. Separation and Purification Technology, 2013, 120: 110