Visible-light-driven photocatalytic degradation of rhodamine B in water by BiOClxI1−x solid solutions | Zendy

Huanyan Xu | Zendy; Dan Lu | Zendy; Qu Tan | Zendy; Xiulan He | Zendy; Shuyan Qi | Zendy

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Visible-light-driven photocatalytic degradation of rhodamine B in water by BiOClxI1−x solid solutions

Author(s) -

Huanyan Xu,

Dan Lu,

Qu Tan,

Xiulan He,

Shuyan Qi

Publication year - 2020

Publication title -

water science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.406

H-Index - 137

eISSN - 1996-9732

pISSN - 0273-1223

DOI - 10.2166/wst.2020.205

Subject(s) - photocatalysis , rhodamine b , photodegradation , materials science , nanosheet , photoluminescence , solid solution , diffuse reflectance infrared fourier transform , scanning electron microscope , spectroscopy , band gap , transmission electron microscopy , photochemistry , chemical engineering , analytical chemistry (journal) , nuclear chemistry , nanotechnology , chemistry , optoelectronics , catalysis , composite material , organic chemistry , physics , metallurgy , quantum mechanics , engineering

Bismuth oxyhalides (BiOXs, X = Cl, Br and I) are emerging photocatalytic materials with unique layered structure, flexible band structure and superior photocatalytic activity. The purpose of this study was to develop a facile alcoholysis route to prepare BiOClxI1−x nanosheet solid solutions at room temperature. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), photoluminescence emission spectroscopy (PL) and Brunauer–Emmett–Teller (BET) surface area analyzer were used to characterize the as-prepared photocatalysts. These results revealed that two-dimension BiOClxI1−x nanosheet solid solutions could be obtained with high percentage of {001} crystal facets exposed. Moreover, the formation of solid solution could regularly change the optical absorption thresholds and band gaps of BiOClxI1−x photocatalysts. The photocatalytic experiments indicated that BiOCl0.75I0.25 exhibited the highest photocatalytic performance for the degradation of Rhodamine B (RhB) under simulated sunlight irradiation and the photocatalytic process followed a pseudo-first-order kinetic equation. A possible mechanism of RhB photodegradation over BiOClxI1−x solid solutions was proposed based on the structural properties of BiOClxI1−x solid solutions and RhB photosensitization.

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