改性层状结晶硅酸钠对钙镁离子交换的动力学研究  

Study on exchange kinetics of layered modified sodium silicate crystal to Ca^(2+)/Mg^(2+)

作　　者：耿卫东[1] 杨雪静[2] 杨亚玲[2] 

机构地区：[1]昆明市生产力促进中心,云南昆明650021 [2]昆明理工大学

出　　处：《无机盐工业》2011年第2期14-16,共3页Inorganic Chemicals Industry

基　　金：国家自然科学基金项目(20862011);云南省教育厅重点项目(2007301)

摘　　要：改性层状结晶硅酸钠(Al-SKS-6)是一种通过层状结晶硅酸钠(SKS-6)改性的性能优良的洗衣粉助剂。对其进行合成并表征,考察了pH、温度和时间对钙镁交换能力的影响及动力学研究。当pH在10左右时,钙离子和镁离子交换能力达到最大,分别为352 mg/g和405 mg/g,可满足洗衣粉的实际要求。Al-SKS-6对钙镁离子的交换是一个快速交换过程,在5 min时,钙镁离子交换能力可达到30 min时的90%,10 min基本可以达到交换平衡,交换过程符合二级动力学方程,且随着温度的升高,Al-SKS-6对钙镁离子交换能力增大。Layered modified sodium silicate crystal （Al -SKS -6） is a kind of excellent detergent additive made from modifying layered sodium silicate crystal （ SKS - 6 ）. A1 - SKS - 6 was synthesized and characterized. Effects of pH, temperature,and time on Ca2＋/Mg2＋ exchange property of Al- SKS-6 were investigated and kinetics thereof was studied. Ex- change properties of Ca2 ＋ and Mg2 ＋ reached 352 mg/g and 405 mg/g respectively, which could satisfy the practical require- ment of detergent when pH was about 10. Process of Al -SKS -6 exchanging Ca^2＋/Mg^2＋ was quite rapid and the exchange property at 5 min was equal to 90% at 30 rain. Furthermore, the exchange process could reach equilibrium in 10 min and accorded to the pseudo second order kinetics equation and the exchange property of Al - SKS - 6 to Ca^2＋/Mg^2＋ increased with increasing temperature.

关 键 词：改性层状结晶硅酸钠 钙镁离子 动力学 

分 类 号：TQ131.12[化学工程—无机化工]