隐钾锰型水合MnO_2的合成及其离子交换选择性

Synthesis of cryptomelane-type hydrous manganese dioxide and its ion-exchange selectivity

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MnO2 ·0 .4H2 O。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+

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 MnO 2. Its structure and chemical formula is α MnO 2 and MnO 2·0.4H 2O 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 +.