载 La（III）热塑性魔芋葡甘聚糖除氟性能及机理研究

摘要

将热塑性魔芋葡甘聚糖挤塑造粒并对其进行羧基化和负载镧[La（III）]改性，制备了柱形粒状载 La（III）热塑性魔芋葡甘聚糖吸附材料（ATDKGM - La）。研究了 pH 值、氟离子初始浓度以及反应温度等对吸附材料的氟离子吸附效果的影响，并对其载镧及吸附机理进行了分析。结果表明：ATDKGM - La 对氟离子的吸附符合 Langmuir 等温吸附模型，最大吸附量达36.23 mg/ g，ATDKGM - La 吸附氟是自发且吸热过程；La 通过与钠离子发生交换而被负载热塑性魔芋葡甘聚糖（ATDKGM）上，ATDKGM - La 的除氟机理是氟离子（F -）与氢氧根（OH -）的离子交换作用。%In this work,an adsorbent,carboxylic acid functionalized deacetylated konjac glucomannan loaded lanthanum(ATDKGM - La)used to remove fluoride from aqueous solution,was successfully syn-thesized. The effects of solution pH,initial concentration of fluoride and temperature on fluoride removal and adsorption properties were investigated systematically. The Langmuir isotherm model can describe the adsorption of fluoride,and the maximum adsorption capacity of fluoride was evaluated to be 36. 23 mg / g at 308 K. The thermodynamic parameters indicate that the nature of fluoride adsorption is spontaneous and endothermic. By means of FT - IR,SEM - EDX and XPS analysis,results show that La(III)is loaded on ATDKGM though ion exchange of sodium of activated deacetylated konjac glucomannan(ATDKGM). The adsorbent ATDKGM - La adsorbed fluoride from aqueous though ion exchange of hydroxyl of ATD-KGM - La.