BiOBr/Bi2WO6 with squamous morphology is successfully prepared by a one-step hydrothermal method. BiOBr/Bi2WO6 is shown to be an ideal material for adsorption. The structure of BiOBr/Bi2WO6 is characterized by powder X-ray diffraction (XRD), X-ray photoelectron (XPS) spectroscopy, and Fourier transform infrared (FT-IR) spectroscopy, and the morphology is observed with scanning electron microscopy (SEM). The specific surface of BiOBr/Bi2WO6 is tested by a nitrogen adsorption/desorption surface area pore size distribution analyzer. According to the experiments with different concentrations of KBr and the SEM photos of BiOBr and Bi2WO6, the possible morphology formation mechanism of squamous BiOBr/Bi2WO6 is proposed. We design a series of adsorption experiments and test the adsorption properties of the compounds with organic dyes as adsorbent and BiOBr/Bi2WO6 as adsorbent. The results show that BiOBr/Bi2WO6 exhibits a higher adsorption capacity for cationic dyes, especially the adsorption rate of MB, and BiOBr/Bi2WO6 shows a higher adsorption capacity compared with that of activated carbon. Adsorption behavior of BiOBr/Bi2WO6 is consistent with the Freundlich isotherm model and the adsorption process of MB follows a pseudo-second-order kinetic model.
Received: 02 February 2016
Published: 14 April 2016
Fund: the National Natural Science Foundation of China(21171002);Natural Science Foundation of Anhui Province, China(11040606M55);Natural Science Foundation of Education Department of Anhui Province, China(KJ2010A015)