高分散纳米薄水铝石和纳米氧化铝的制备及其对甲基橙的吸附性能  

Preparation and Adsorption Properties for Methyl Orange of Highly Dispersed Boehmite and Alumina Nanostructures

作　　者：吴彩红 郑国源[1,2] 王吉林 莫淑一 邹正光 龙飞[1,2] WU Cai-Hong;ZHENG Guo-Yuan;WANG Ji-Lin;MO Shu-Yi;ZOU Zheng-Guang;LONG Fei(School of Materials Science and Engineering, Key Laboratory of Nonferrous Materials and New Processing Technology of Ministry of Education, Guilin University of Technology, Guilin,Guangxi 541004, China;Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi, Guilin University of Technology, Guilin, Guangxi 541004, China)

机构地区：[1]桂林理工大学材料科学与工程学院有色金属及材料加工新技术教育部重点实验室,桂林541004 [2]桂林理工大学广西有色金属隐伏矿床勘查及材料开发协同创新中心,桂林541004

出　　处：《无机化学学报》2019年第3期449-458,共10页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金项目(No.51672052);广西‘特聘专家’专项经费资助项目

摘　　要：以硝酸铝为铝源,尿素为沉淀剂,采用无模板水热法合成纳米薄水铝石(γ-AlO(OH))。在不同温度下煅烧后,得到氧化铝产物(γ-Al2O_3和θ-Al2O_3)。利用X射线衍射(XRD)、场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)、傅里叶变换红外光谱(FTIR)、氮气吸附-脱附法和紫外-可见分光光度计(UV-Vis)对产物进行了表征分析。并且研究了产物对甲基橙(MO)的吸附性能,系统地考察了吸附时间、溶液的pH值、甲基橙浓度及循环使用对产物吸附性能的影响。此外,还对吸附过程进行了相关吸附理论研究。结果表明:与其他方法所制备的产物相比,通过该方法获得的产物的分散性更高,形态更均匀和完整。产物为高度分散的纳米捆扎状结构。γ-AlO(OH)对甲基橙的最大吸附量达1 492.5 mg·g^(-1)。另外,产物的吸附机制包含化学作用吸附机制和静电作用吸附机制等。3种产物对甲基橙的吸附均符合Langmuir单分子层吸附模型,吸附过程均符合二级动力学特征。The nano boehmite (γ-AlO(OH)) was synthesized by template-free hydrothermal method with aluminum nitrate as the aluminum source and urea as the precipitant. The final products aluminum oxide (γ-Al2O3 and θ- Al2O3) were obtained by calcined at different temperatures. The products were characterized by X-ray diffraction (XRD), field emission scanning electron microcopy (FESEM), transmission electron microscopy (TEM), Fourier transfer infrared (FTIR), nitrogen adsorption-desorption method and UV-visible Spectrophotometer (UV-Vis). The adsorption properties of the product for methyl orange (MO) was studied, and the effect of adsorption time, pH value of the solution, methyl orange concentration and recycling on the adsorption performance of the products systematically were investigated. In addition, the adsorption theory studies on the adsorption process was conducted. The results showed that the products obtained by this method are more dispersible, uniform and complete in morphology compared to the products prepared by other methods. The products were highly dispersed nano-bundled structure. The maximum adsorption of γ-AlO(OH) on methyl orange reached 1 492.5 mg·g^-1. The adsorption mechanism of the products includes chemical adsorption mechanism, electrostatic adsorption mechanism and so on. The adsorption of MO on the three products accord with the Langmuir monolayer adsorption model, and the adsorption process are consistent with the pseudo-second-order kinetic.

关 键 词：材料学 薄水铝石 水热法 氧化铝 甲基橙 吸附 高分散纳米结构 

分 类 号：O647.3[理学—物理化学]