Enhancing the intrinsic properties of flower-like BiOI by S-doping toward excellent photocatalytic performances

doi:10.1016/j.jmst.2021.12.024

Abstract

Abstract:

A facile strategy was proposed to fabricate the S-doped flower-like BiOI microspheres (S-BiOI) for boosting the photocatalytic performance of BiOI via engineering the surface oxygen vacancy and exposed {001} crystal planes. The S-doping generated oxygen vacancies in BiOI lattice structure to create point defects and exposed {001} crystal planes, resulting in a decrease in bandgap and an enhancement in charges separation, which could significantly hasten the photocatalytic reaction. The concentration of CH₄N₂S was a key factor to promote the Cr(VI) reduction activities. The optimized S-BiOI_1.25 presented a superior Cr(VI) removal efficiency of 100% for 60 min, which Cr(VI) reduction rate was 11.3 times higher than the pristine BiOI and still remained 97.5% Cr(VI) removal after 5 cycles. DFT calculation confirmed that the bandgap of the S-BiOI was narrowed compared to that of BiOI, but the S-BiOI still remained the intrinsic band structure of the pristine BiOI.

Key words: BiOI, Sulfide doping, Oxygen vacancy, Photocatalyst, Optical absorption

Jie Xiong, Hong-Yan Zeng, Sheng Xu, Jin-Feng Peng, Fang-Yuan Liu, Li-Hui Wang. Enhancing the intrinsic properties of flower-like BiOI by S-doping toward excellent photocatalytic performances[J]. J. Mater. Sci. Technol., 2022, 118: 181-189.

Figures/Tables 8

Scheme 1. Synthetic strategy used to prepare the S-BiOI.

Fig. 1. XRD (A, B) patterns of the pristine BiOI and S-BiOI; Raman spectra (C) of the pristine BiOI and S-BiOI1.25; FT-IR (D) patterns of the pristine BiOI and S-BiOI.

Table 1. Calculated lattice constants of the as-prepared materials using MDI Jade 6.0.

Empty Cell	I₀₀₁/I₁₀₂	FWHM₁₀₂*	Crystalline size(nm)	Crystallinty(%)
BiOI	0.119	0.219	42.1	71.1
S-BiOI_0.25	0.418	0.218	42.5	73.3
S-BiOI_0.50	0.506	0.195	48.7	76.3
S-BiOI_1.00	0.728	0.193	49.0	77.1
S-BiOI_1.25	0.871	0.188	51.7	80.1
S-BiOI_1.50	0.799	0.198	49.9	77.7
S-BiOI_2.50	0.185	0.269	32.8	75.7

Fig. 2. XPS spectra (A-D) and EPR spectra (E) of the pristine BiOI and S-BiOI1.25.

Fig. 3. SEM images (A) of the pristine BiOI and S-BiOI, and EDX mapping images (B) of the S-BiOI1.25; TEM and HRTEM images (C) of the pristine BiOI and S-BiOI1.25.

Fig. 4. UV-vis DRS spectra (A), corresponding Tauc plots (B) and N2 adsorption-desorption isotherms (C) of the pure BiOI and S-BiOI; PL spectra (D), Nyquist plots (E) and TPC responses (F) of the pristine BiOI and S-BiOI.

Fig. 5. Atomic crystal structure diagram (A), energy band structure (B) and calculated electronic density of states (C) of the pristine BiOI and S-BiOI.

Fig. 6. Cr(VI) reduction efficiency (A), corresponding kinetic fitting plots (B) and apparent rate constants (C) of the pristine BiOI and S-BiOI; Cr(VI) changes in the UV-vis spectra for Cr(VI) photoreduction over the S-BiOI1.25 at different time (D); Stability of the S-BiOI1.25 material (E); Cr 2p spectrum (F) of the spent S-BiOI1.25 after the Cr(VI) photoreduction.

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