A simple post-synthesis conversion approach to Zn(OH)F and the effects of fluorine and hydroxyl on the photodegradation properties of dye wastewater

作者：Yang, Hao; Teng, Fei^*; Gu, Wenhao; Liu, Zailun; Zhao, Yunxuan; Zhang, An; Liu, Zhe; Teng, Yiran

来源：Journal of Hazardous Materials, 2017, 333: 250-258.

DOI：10.1016/j.jhazmat.2017.03.039

• Dye wastewater
• Fluorine
• Hydroxyl
• Energy band
• Zn(OH)F

In this work, Zn(OH)F is prepared by an initiative, simple post-synthesis method, in which the molar ratio of F/Zn (RE) was varied to investigate the effect of the NH4F amounts added on the samples. Further, we have mainly investigated their energy bands and photochemical properties. Under UV light irradiation (lambda 420 pound nm), the samples (R-F = 0,1,2) show the high degradation activities of methylene blue (MB) dye, namely, 80% of MB can be degraded after 8 min. It is found that the hydroxyl and fluorine have greatly down shifted the conduction band (CB, 0.99 eV) and valence band (VB, 4.17 eV) of Zn(OH)F, compared with ZnO (CB= -0.31 eV, VB = 2.89 eV), but with the nearly same band gap. For the degradation of MB dye, the main oxidative species are holes and hydroxyl radicals for ZnO and Zn(OH)F, respectively. This study suggests that this simple post-synthesis fluorination approach could be extended to develop the other photocatalysts; moreover, we can facilely tune the band structure and photocatalytic activity by introducing or removing hydroxyl and fluorine, which could benefit to develop new photocatalysts.

• 出版日期2017-7-5
• 单位南京信息工程大学