多孔氧化铝的制备及其对酸性品红的吸附性能

Preparation and Adsorption Performance for Acid Fuchsin of Hierarchical Porous Alumina

以麦冬叶子为模板制备了多级孔结构的氧化铝材料,并使用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)和氮气吸附-脱附等分析手段,对氧化铝的相态、结构和形貌进行了表征。同时,研究了多孔氧化铝对酸性品红的吸附性能,考察了吸附剂用量、吸附时间和溶液温度对酸性品红吸附量和脱除率的影响,并使用准一级和准二级动力学方程、Langmuir和Freundlich等温吸附模型以及粒子内扩散模型对吸附过程进行分析。结果表明,得到的氧化铝材料较好地遗传了叶子的微观形貌和多孔结构,并且对酸性品红具有良好的吸附性能,吸附过程与准二级动力学速率方程、Langmuir吸附等温线模型的拟合结果具有很好的相关性,为单分子层化学吸附。

A hierarchical pore alumina was prepared using Liriope leaf as template. The obtained materials were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and N2 adsorption/desorption methods. The effect of adsorption time, reaction temperature and the dosage of alumina on the adsorbance and removal rate of as-prepared alumina to acid fuchsin were investigated. Furthermore, pseudo-first-order and pseudo-second-order kinetics equation, Langmuir and Freundlich isotherm models and particles diffusion equation were adopted to analyze the adsorption process. The hierarchical pore alumina derived from the leaf microstructure showed high acid fuchsin adsorption capacity. Moreover, the adsorption process well coincided with pseudo-second-order kinetic equation and Langmuir isotherm model, indicating the adsorption of acid fuchsin on the alumina was a monolayer chemical adsorption process.