聚丙烯酸-丙烯酸钠复合膨润土的制备及其对F^-吸附的研究

Preparation of the modified poly acrylic acid-sodium acrylate bentonite composite and its adsorption to F^-

针对粉末状膨润土在水处理应用中固液相难分离、吸附性能低等问题,以丙烯酸为聚合单体,采用悬浮乳液聚合法,制备了粒状聚(丙烯酸-丙烯酸钠)钙基复合膨润土吸附剂.利用无机羟基铁对此粒状膨润土进行无机改性,并用XRD、SEM和红外光谱(IR)分析手段对产品进行了表征,显示改性剂成功添加并进入膨润土层间或表面.羟基铁改性聚(丙烯酸-丙烯酸钠)复合膨润土对F的吸附效果最好,吸附量优于文献报道的其他改性膨润土,并且对F具有良好再生性能.0.5 g羟基铁改性聚丙烯酸-丙烯酸钠复合膨润土处理50 m L浓度为16.3 mg/L的F溶液时,平衡吸附量和去除率分别为1.52 mg/g和92.4%.羟基铁改性聚(丙烯酸-丙烯酸钠)复合膨润土对F的平衡吸附复合Freundlich等温吸附方程.

In view of difficult separation of powder bentonite from aqueous solution in water treatment and low absorp- tionpropertiesofpowderbentonite, the granular poly （acrylic acid-sodium acrylate） bentonite composite was synthesized by suspension polymerzation using acrylic acid as polymerization monomer. Iron hydroxy polycation was applied to synthesize modified poly acrylic acid-sodium acrylate bentonite composite with hydroxy Fe. The characteristics of modified montmorillonite were determined with X-ray diffraction （XRD）, Fourier transform infrared spectrum （FTIR） and Scanning electron microscope analysis （SEM）. The results show that the modifying agents have entered the interlayer or adsorbed on the surface. The experiment results indicate that modified poly acrylic acid-sodium acrylate bentonite composite with hydroxy Fe had excellent adsorption and regeneration properties. Its adsorption capacity was superior to other modified bentonite in previous research. When 0.5g of modified poly acrylic acid-sodium acrylate bentonite composite with hydroxy Fe was used to treat 50 mL off -containing solution at the concentration of 16.3 mg/L, its equilibrium ad- sorption capacity to F^-, and their removal rate were 1.52 mg/g and 92.8% respectively. The adsorption equilibrium data of F- on the Iron-organic pillared were consistent with the Freundlich isotherm equations.