复合材料POSS/TX-10/Bent的制备及其吸附性能

Preparation and Adsorption Properties of Composites POSS/ TX-10 /Bent

摘要:

以多面齐聚倍半硅氧烷(POSS)、TX-10型非离子表面活性剂为改性剂对膨润土(Bent)进行复合改性制备了复合材料(POSS/TX-10/Bent)，并利用亚甲基蓝研究了其吸附性能。采用XRD、XPS、EA、FTIR、SEM对POSS/TX-10/Bent进行了组成与结构表征。结果表明：POSS和TX-10型非离子表面活性剂都成功插入到膨润土层间，使得复合材料层间距增大，疏水性增强。吸附实验表明在30 ℃，pH为6.52（原始值）的条件下，复合材料投加量5 g/L、吸附180 min时效果最佳。并且在同等吸附条件下，复合改性膨润土对亚甲基蓝的吸附能力远大于未改性的膨润土。吸附过程更符合准二级动力学模型，平衡吸附数据与Langmuir等温吸附曲线吻合较好，吸附是一个自发的吸热过程，POSS/TX-10/Bent对亚甲基蓝的理论最大吸附量为253.81 mg/g。

Abstract:

A novel composites (POSS/TX-10/Bent) were prepared by composite modification of bentonite with polyhedral oli-gomeric silsesquioxane (POSS) and TX-10 nonionic surfactant as modifiers, the adsorption effect of POSS/TX-10/Bent on methylene blue was also investigated in detail. Composition and structure of composite modi-fied bentonite were characterized by XRD, XPS, EA, FTIR, SEM. The results showed that POSS and TX-10 nonionic surfactants successfully inserted into the interlayer of bentonite, which increased the interlayer spacing and hydropho-bicity of the composites. The optimum conditions were 30 ︒C, pH 6.52 (initial value), dosage 5 g/L and adsorption time 180 min., the adsorption capacity of composite modified bentonite for methylene blue was much higher than that of unmodified bentonite. The adsorption process is more in accordance with the pseudo-second-order kinetic model and the adsorption isotherm coincides with Langmuir, adsorption is a spontaneous endothermic process. The theoretical maximum adsorption capacity of the POSS/TX-10/Bent on methylene blue is 253.81 mg/g.