Chemical Journal of Chinese Universities ›› 2019, Vol. 40 ›› Issue (10): 2164-2169.doi: 10.7503/cjcu20190229

• Physical Chemistry • Previous Articles     Next Articles

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

GUO Qian,TANG Guangbei,WANG Hao,SUN Qian,GAO Xiaoya()   

  1. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
  • Received:2019-04-18 Online:2019-09-05 Published:2019-09-05
  • Contact: GAO Xiaoya E-mail:gaoxiaoyaya@126.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No. U1402233);the High-level Scientific Research Foundation for Talent Introduction of Kunming University of Science and Technology, China.(No. 10978172)

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: