桑商斌1， 鐘世安1，唐愛東1， 劉占明2
(1. 中南大學(xué) 化學(xué)化工學(xué)院， 長沙 410083;
2. 華北鋁業(yè)有限公司， 琢州 072750)
摘 要: 以硫酸錳和高錳酸鉀為原料，合成了離子記憶無機(jī)離子交換劑—隱鉀錳型水合二氧化錳(CRYMO)。通過粉末X射線衍射以及熱重分析確證了其晶體結(jié)構(gòu)為α-MnO2，化學(xué)式為MnO20.4H2O。考察了其對Na+，K+，Rb+的表觀離子交換容量隨溶液pH值的變化情況；離子交換等溫線及分配系數(shù)曲線均表明隱鉀錳型水合二氧化錳對K+和Rb+具有高選擇性。
關(guān)鍵字: 隱鉀錳型水合二氧化錳； 堿金屬離子； 離子交換選擇性
dioxide and its ion-exchange selectivity
SANG Shang-bin1, ZHONG Shi-an1, TANG Ai-dong1, LIU Zhan-ming<
（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
