Tunable Synthesis of BiOBr for Efficient Photocatalytic Degradation of Carbamazepine in Wastewater †

doi:10.7503/cjcu20190229

Abstract

Abstract:

A series of BiOBr photocatalysts was prepared with different bromine sources using an ethanol mediated solvothermal method with Bi(NO₃)₃·5H₂O as precursor. The obtained samples were characterized by powder X-ray diffraction(XRD), scanning electron microscopy(SEM), Fourier transform Infrared spectroscopy(FTIR), UV-Vis diffuse reflectance spectroscopy(UV-Vis DRS) and N₂ adsorption-desorption analysis. The results showed that the crystallinity structure, morphology and specific surface were influenced by bromine source. The BiOBr(K∶C=3∶7) sample prepared with KBr and CTAB(molar ratio 3∶7) as bromine sources exhibited high photocatalytic efficiency towards the degradation of carbamazepine under simulated solar light irradiation. The photocatalytic reaction with BiOBr(K∶C=3∶7) as catalyst followed pseudo first-order kinetics model with a reaction rate constant over 4.10, and 2.14 times that with BiOBr(K) and BiOBr(C) as catalyst, respectively. The enhanced photocatalytic activities could be attributed to the highly exposed(110) facet, surface hydroxyl, loose-packed lamellar morphology, as well as large specific surface area and pore volume. Radicals trapping experiments showed that h ⁺, ·OH and e ^- were involved in the photocatalytic degradation of carbamazepine.

Key words: Tunable synthesis, Bromine source, BiOBr, Photocatalysis, Carbamazepine

CLC Number:

O643

GUO Qian,TANG Guangbei,WANG Hao,SUN Qian,GAO Xiaoya. Tunable Synthesis of BiOBr for Efficient Photocatalytic Degradation of Carbamazepine in Wastewater ^†[J]. Chemical Journal of Chinese Universities, 2019, 40(10): 2164-2169.

Figures/Tables 9

Fig.1 XRD patterns of the as-prepared BiOBr photocatalysts using different Br source a. BiOBr(C); b. BiOBr(K∶C=3∶7); c. BiOBr(K).

Fig.2 FTIR spectra of the as-prepared BiOBr photocatalysts using different Br source a. BiOBr(C); b. BiOBr(K∶C=3∶7); c. BiOBr(K).

Fig.3 SEM images of the as-prepared BiOBr photocatalysts using different Br sources (A, B) BiOBr(K); (C, D) BiOBr(K∶C=3∶7); (E, F) BiOBr(C).

Fig.4 UV-Vis DRS of different BiOBr samples

Fig.5 Nitrogen adsorption-desorption isotherms(A) and pore size distribution curves(B) of different BiOBr samples

Fig.6 Photocatalytic degradation of carbamazepine solution under simulated solar light irradiation in the presence of different BiOBr photocatalysts [CBZ]0= 2.5 mg/L; [BiOBr] = 0.8 g/L.

Fig.7 Pseudo-first order kinetics for the photocatalytic degradation of carbamazepine under simulated solar light irradiation in the presence of different BiOBr photocatalysts [CBZ]0= 2.5 mg/L; [BiOBr] = 0.8 g/L.

Fig.8 HRTEM image of BiOBr(K∶C=3∶7)

Fig.9 Effects of scavengers on the photocatalytic degradation of carbamazepine over BiOBr(K∶C=3∶7) a. No quencher; b. N2; c. HCOONa; d. IPA; e. K2Cr2O7.

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