Al、Co、Sc掺杂SiO2微纳材料的制备、结构表征及其对Cr3+和Mn2+的吸附特性  

Preparation,characterization and Cr and Mn adsorption properties of Al,Co,Sc-doped SiO micro-nano materials

作　　者：田乙卜 刘少友[2] 吴新文 石姚金 龙尚俊 TIAN Yibu;LIU Shaoyou;WU Xinwen;SHI Yaojin;LONG Shangjun(Guizhou Testing Technology Research and Application Center,Guiyang 550014,China;Kaili University,Kaili 556011,China)

机构地区：[1]贵州省检测技术研究应用中心,贵州贵阳550014 [2]凯里学院,贵州凯里556011

出　　处：《贵州科学》2020年第4期79-84,共6页Guizhou Science

摘　　要：以正硅酸乙酯(TEOS)为硅源,CTAB或SDBS为模板,带结晶水的无机盐(六水氯化铝、六水氯化钴、六水氯化钪)为掺杂物,采用固-固反应法分别制备了Al、Co、Sc单掺杂的SiO2粉体材料。采用XRD、SEM、FTIR等分析手段对所制备粉体材料的结构、形貌等进行了表征;考察了不同表面活性剂、掺杂物、焙烧温度等对SiO2粉体材料吸附性能的影响。结果表明,SiO2微纳粉体材料的形貌为不规则团聚块体,其尺寸处在50 nm^10μm,金属掺杂引起纯SiO2粉体材料XRD衍射峰的微小偏移,红外吸收谱带发生红移,其中以Al-SiO2发生红移程度为最大(1065 cm-1→1081 cm-1);对Cr^3+、Mn^2+的吸附率均比纯SiO2高,并呈现出以下顺序:Al-SiO2>Co-SiO2>Sc-SiO2>SiO2。相同条件下,以CTAB为模板比以SDBS为模板所得的Al-SiO2微纳材料对Cr3+、Mn2+的吸附率大,比纯SiO2粉体的吸附率分别提高了88.5%和90%。With tetraethylorthosilicate(TEOS) as silica source,CTAB or SDBS as template,inorganic salt with water of crystallization(aluminum chloride hexahydrate,cobalt chloride hexahydrate,scandium chloride hexahydrate) as the dopant,solid-solid reaction was used to prepare Al,Co,Sc-doped SiO2 powder materials. By means of XRD,SEM,and FTIR,the structure and morphology of the powder materials were characterized,and the influence of different surfactants,dopants,and roasting temperatures on the adsorption properties of the powder materials was studied. The results showed that the morphology of the SiO2 powder materials was irregular blocks with size of 50 nm to 10 μm. Doping with metal led to small distortion in the diffraction peak of SiO2 powder materials. The red shift degree of Al-SiO2 was the largest. The Cr^3+and Mn^2+ adsorption rate of the doped materials were higher than that of pure SiO2,ranking as follows: Al-SiO2>Co-SiO2>Sc-SiO2>SiO2. Under the same conditions,the Al-SiO2 material with CTAB as template had higher Cr^3+and Mn^2+ adsorption rate than that with SDBS as template;compared with pure SiO2,the Cr3+and Mn2+ adsorption rate increased by 88.5% and 90%,respectively.

关 键 词：二氧化硅微纳粉体材料 固-固反应法 金属掺杂 吸附性能 

分 类 号：O613.72[理学—无机化学] TF09[理学—化学]