中文摘要：

采用超声辅助共沉淀法,制备了二氧化铈/钙铝水滑石/活性炭复合材料（CeO_2/CaAl-LDHs/AC）。通过场发射扫描电子显微镜、X射线衍射、X射线光电子能谱、傅里叶变换红外光谱和热重分析技术,对CeO_2/CaAl-LDHs/AC的形貌、组成和结构进行了表征。结果发现：花样片层状的CeO_2/CaAl-LDHs材料均匀地分布在活性炭上。考察了CeO_2/CaAl-LDHs/AC对水溶液中铬（Ⅵ）、铅（Ⅱ）、氟和孔雀绿的吸附性能。此类污染物的吸附过程均符合准二阶动力学模型和Langmuir等温模型;在pH=7、45℃和吸附时间2h条件下,CeO_2/CaAl-LDHs/AC可成功用于铬（Ⅵ）、铅（Ⅱ）、氟和孔雀绿的吸附去除,最大吸附量分别为83.06mg/g、131.58mg/g、61.20mg/g和420.17mg/g。

英文摘要：

Ce-doped Ca Al/layered double hydroxide was coated at activated carbon（CeO_2/Ca AlLDHs/AC） by co-precipitation method with the aid of ultrasound. The products was characterized by field emission scanning electron microscopy,X-ray diffraction,X-ray photoelectron spectroscopy,Fourier transform infrared spectroscopy and thermogravimetric analysis. Flower-like layer structure CeO_2/Ca Al-LDHs was well distributed on the surface of active carbon with good thermostability. The adsorption of Cr（Ⅵ）,Pb（Ⅱ）,fluoride and malachite green by CeO_2/Ca Al-LDHs/AC were investigated respectively in aqueous solution. All the adsorption processes agree with the pseudo-second-order kinetic model and the Langmuir isotherm model. The maximum adsorption capacity of Cr（Ⅵ）,Pb（II）,fluoride and malachite green are 83.06mg/g,131.58mg/g,61.20mg/g and 420.17mg/g at p H=7.0,45℃ and 2h,respectively.