(1. 中南大学 化学化工学院， 长沙 410083;
2. 华北铝业有限公司， 琢州 072750)
摘 要: 以硫酸锰和高锰酸钾为原料，合成了离子记忆无机离子交换剂—隐钾锰型水合二氧化锰(CRYMO)。通过粉末X射线衍射以及热重分析确证了其晶体结构为α-MnO2，化学式为MnO20.4H2O。考察了其对Na+，K+，Rb+的表观离子交换容量随溶液pH值的变化情况；离子交换等温线及分配系数曲线均表明隐钾锰型水合二氧化锰对K+和Rb+具有高选择性。
关键字: 隐钾锰型水合二氧化锰； 碱金属离子； 离子交换选择性
dioxide and its ion-exchange selectivity
（1. College of Chemistry and Chemical Engineering，
Central South University，Changsha 410083, P.R.China;
2. North China Aluminium Limited Corporation,
Zuozhou 072750, P.R.China）
Abstract: Cryptomelane-type hydrous manganese dioxide(CRYMO) was synthesized. It is a kind of inorganic ion-memory exchanger. Its crystal structure and chemical formula were determined by powder X-ray diffraction and thermal gravity analysis. Belonged to α-MnO2. Its structure and chemical formula is α-MnO2 and MnO20.4H2O respectively. The changes of the apparent ion-exchange capacities of Na+, K+, Rb+ with pH value of solution were studied. Both ion-exchange isotherms and distribution plots have shown that CRYMO has high ion-exchange selectivity to K+ and Rb+.
Key words: cryptomelane-type hydrous manganese dioxide; alkali metal ion; ion-exchange selectivity
