摘要
以KMnO4为锰源,采用水热技术在180℃条件下于不同种类酸溶液中可控制备了α-,β-,δ-MnO2,系统研究了K+,H+及阴离子对制备产物MnO2晶型和形貌的影响.研究结果表明,K+与H+在反应体系中对于制备产物晶相的生成形成竞争性影响,其量的大小对制备产物晶型具有控制作用,高浓度K+离子有助于生成α-MnO2,而高浓度的H+有利于生成β-MnO2;阴离子的种类和浓度对制备产物MnO2的晶型和形貌无显著影响.在对制备产物进行XRD,SEM和元素分析的基础上,提出了不同晶型和形貌MnO2的可能形成机理.
Manganese oxides with α-, β- and δ-type structures were controllably synthesized by hydrothermally treating KMnO4 in different acid solutions at 180 ℃. The effects of metallic cations, H^＋ and anions in the reaction system on the structures and morphologies of manganese oxide nanocomposites were investigated systematically. The experimental results indicated that cations played a major role in the formation of manganese oxide nanocomposites with different structures, and K^＋ ions were in competition with H＋ ions in the solution for the formation of manganese oxide nanocomposites, α-MnO2 was formed when the amount of K^＋ ions was higher than that of H^＋ ions, while the higher amount of H^＋ ions was favorable for the formation of β-MnO2. On the other hand, both the type and the concentration of anions in the solution have no significant effect on the structure and morphology of manganese oxide nanocomposites. The possible forma- tion mechanism was proposed on the basis of the characterization for the obtained manganese oxide nanocomposites by XRD, SEM and elemental analysis.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2009年第22期2566-2572,共7页
Acta Chimica Sinica
基金
国家高技术发展研究计划(No.2007AA03Z248)
陕西省自然科学基金项目(No.2007B15)
关键词
水热法
MnO2晶型
形貌
形成机理
可控制备
hydrothermal method
manganese oxide structure
morphology
formation mechanism
controllable synthesis
