物理化学学报 >> 2016, Vol. 32 >> Issue (7): 1844-1850.doi: 10.3866/PKU.WHXB201604142

论文 上一篇    

鳞状BiOBr/Bi2WO6的合成及其吸附性能

刘晓灵,宋继梅*(),董纳,胡刚,杨捷,司维,李文慧   

  • 收稿日期:2016-02-02 发布日期:2016-07-08
  • 通讯作者: 宋继梅 E-mail:jmsongsss@163.com
  • 基金资助:
    国家自然科学基金(21171002);安徽省自然科学基金(11040606M55);安徽省教育厅自然科学基金(KJ2010A015)

Synthesis and Adsorption Properties of Squamous BiOBr/Bi2WO6

Xiao-Ling LIU,Ji-Mei SONG*(),Na DONG,Gang HU,Jie YANG,Wei SI,Wen-Hui LI   

  • Received:2016-02-02 Published:2016-07-08
  • Contact: Ji-Mei SONG E-mail:jmsongsss@163.com
  • Supported by:
    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)

摘要:

采用一步水热法成功制备鳞状形貌的BiOBr/Bi2WO6复合物,通过X射线衍射(XRD)仪、扫描电子显微镜(SEM)、N2吸附/解吸附比表面测定仪(BET)、傅里叶变换红外(FT-IR)光谱等对复合物进行了表征。对比Bi2WO6与BiOBr的SEM照片,结合KBr的浓度实验,提出了BiOBr/Bi2WO6的鳞状形貌的形成机理。选取有机染料为吸附质,BiOBr/Bi2WO6为吸附剂进行了复合物吸附性能测试。结果表明,BiOBr/Bi2WO6对阳离子染料表现出优越的吸附性能,10 min对次甲基蓝(MB)的吸附率高达99%,优于常规的活性炭吸附剂。此外,BiOBr/Bi2WO6对有机染料的吸附行为符合准二级反应速率方程和Freundlich等温吸附模型。

关键词: 鳞状, BiOBr/Bi2WO6, 吸附, 形貌, 有机染料

Abstract:

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.

Key words: Squamous, BiOBr/Bi2WO6, Adsorption, Morphology, Organic dye

MSC2000: 

  • O647