锌铝水滑石的控制合成及吸附性能研究  

Controlled synthesis of Zn-Al layered double hydroxides and study on their adsorption capability

作　　者：徐焱[1] 李张成 王百年[2] 于斌[3] 张霄翔[1] 

机构地区：[1]合肥工业大学制药工程系,安徽合肥230009 [2]合肥工业大学化学工程学院,安徽合肥230009 [3]中国石化扬子石油化工股份有限公司,江苏南京210048

出　　处：《能源化工》2014年第6期64-69,共6页Energy Chemical Industry

摘　　要：采用简单的水热法和均匀共沉淀法合成了不同形貌的锌铝水滑石(Zn Al-LDHs),通过XRD、SEM、N2吸附等对合成的试样进行了表征;研究了甲基橙在Zn Al-LDHs上的吸附性能,考察了酸碱度和温度等对其吸附性能的影响。结果表明:采用水热法,添加乙二醇可合成出海胆状Zn Al-LDHs,添加乙醇可合成出花状Zn Al-LDHs;采用均匀共沉淀法可合成出片状Zn Al-LDHs。其中海胆状Zn Al-LDHs的比表面积最高,达147.3 m2/g,对甲基橙具有优异的吸附性能。在25℃,初始p H=3的条件下,0.2 g/L海胆状Zn Al-LDHs对100 mg/L甲基橙的吸附容量和去除率分别达368 mg/g和73.65%,其吸附动力学和吸附等温线分别符合准二级速率方程和Langmuir方程。Zn-Al layered double hydroxides（ Zn Al-LDHs） are synthesized by hydrothermal and homogeneous co-precipitation methods,respectively. The as-prepared samples are characterized by X-ray diffraction（ XRD）,scanning electron microscopy（ SEM）and N2 adsorption,respectively. Adsorption properties of methyl orange（ MO） on Zn Al-LDHs are studied to investigate the influences of initial solution p H and temperature. It is found that the urchin-like and flower-like Zn Al-LDHs can be synthesized by hydrothermal method when adding glycol and ethanol,respectively. Zn Al-LDHs nanosheets can be successfully prepared by homogeneous co-precipitation method using urea as precipitating agent. The specific surface area of sample urchin-like Zn Al-LDHs reaches up to 147. 3 m2/ g,which shows excellent adsorption performance for MO. The results of adsorption experiments indicate that the maximum capacity of MO at equilibrium（ qe） and percentage of adsorption with a fixed adsorbent dose of 0. 2 g/L are 368 mg/g and 73. 65%,when concentration of methyl orange,temperature and p H are 100 mg / L,25 ℃ and 3,respectively. The adsorption kinetic and the adsorption isotherm of MO on the urchin-like Zn Al-LDHs can be described by the Langmuir isotherm and pseudo-second order kinetic.

关 键 词：锌铝水滑石 比表面积 吸附 甲基橙 

分 类 号：O647.3[理学—物理化学]