One-step Synthesis of Hydrangea-like BiOCl/Br Solid Solution Photocatalyst with Co-template Method†

doi:10.7503/cjcu20160894

Abstract

Abstract:

Hydrangea-like BiOCl/Br solid solution photocatalysts were prepared by using glycol/dodecyl trimethyl amonium bromide(EG/DTAB) co-template in one step. The catarysts were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, N₂ adsorption-desorption, and UV-Vis diffuse reflectance spectroscopy. The results showed that the BiOCl/Br solid solution obtained by the EG/DTAB co-template method had a layered structure like hydrangea, different from BiOCl hierarchical microspheres prepared by solvothermal method; the Br^- of DTAB was inserted into the lattice of BiOCl to form a solid solution, reducing the band gap of BiOCl. Hydrangea-like BiOCl/Br solid solution showed excellent photocatalytic activity for degradation of rhodamine B(RhB) and methyl orange(MO) under visible light irradiation. When the molar ratio of DTAB to KCl was 0.75, the photocatalytic degradation rate of RhB was 97.2% within 8 min, and that of MO was 83.6% with 1 h.

Key words: Co-template method, Glycol/dodecyl trimethyl amonium bromide(EG/DTAB), Hydrangea-like BiOCl/Br solid solution photocatalyst

CLC Number:

O644

TrendMD:

CHEN Ying, ZHAO Yu, LI Jing, HAN Xingyue. One-step Synthesis of Hydrangea-like BiOCl/Br Solid Solution Photocatalyst with Co-template Method^†[J]. Chem. J. Chinese Universities, 2017, 38(11): 2045.

Figures/Tables 13

Fig.1 XRD patterns(A) and (101) diffraction peak in the range of 2θ=24°—27°(B) of BiDCl/Br samples

Fig.2 SEM images of the BiOCl/Br samples(A) 001-BiOCl; (B) BiOCl/Br-0; (C) BiOCl/Br-0.25; (D) BiOCl/Br-0.50; (E) BiOCl/Br-0.75; (F) BiOCl/Br-1.00.

Fig.3 Magnified SEM images of different BiOCl/Br samples(A) BiOCl/Br-0.25; (B) BiOCl/Br-0.50; (C) BiOCl/Br-0.75; (D) BiOCl/Br-1.00.

Fig.4 XPS spectrum of BiOCl/Br-0.75

Table 1 Lattice parameters, ABET, pore size and band gap of BiOCl/Br samples

Sample	n_Br:n_Cl(XPS)	A_BET/(m²·g^-1)	Pore size/nm	Band gap/eV
BiOCl/Br-0	0	13.1182	7.6904	2.50
BiOCl/Br-0.25	0.237	18.1084	14.4502	2.50
BiOCl/Br-0.50	0.485	16.7579	14.8735	2.50
BiOCl/Br-0.75	0.775	15.7896	18.5416	2.37
BiOCl/Br-1.00	0.983	11.8240	14.5713	2.37

Fig.5 Schematic illustration of proposed formation mechanism of BiOCl sample

Fig.6 Nitrogen adsorption-desorption isotherms of BiOCl/Br-0.75

Fig.7 UV-Vis DRS of BiOCl samples

Fig.8 Photodegradation of RhB under visible light(A), MO under visible light(B) and UV light(C) irradiation and comparative studies of MO degradation rate under visible light and UV light irradiation(D) with BiOCl samples(D) a. 001-BiOCl; b. BiOCl/Br-0; c. BiOCl/Br-0.25; d. BiOCl/Br-0.50; e. BiOCl/Br-0.75; f. BiOCl/Br-1.00.

Fig.9 Proposed mechanism for photocatalytic degradation of MO over BiOCl under visible light(A) and UV light(B) irradiation

Fig.10 SEM images and photographs(insets) of MO after the adsorption and degradation(A) Abs-001-BiOCl; (B) Vis-001-BiOCl; (C) UV-001-BiOCl; (D) Abs-BiOCl/Br-0.75;(E) Vis-BiOCl/Br-0.75; (F) UV-BiOCl/Br-0.75.

Fig.11 Infrared spectra of different samples

Fig.12 Photodegradation of MO with BiOCl/Br-0.75 in repeated experiments under visible light irradiation

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