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利用天然粘土埃洛石纳米管和少量非离子表面活性剂吐温80为乳化剂构建了水包油(O/W)型Pickering高内相乳液(HIPEs),并以其为模板制备了大孔聚合泡沫(MPFs)。MPFs具有开口的大孔结构、丰富的内部交联孔道和亲水的表面,且在水中呈悬浮状态,这些特点均有利于吸附水体系中的菊酯类农药。结合静态吸附实验研究了MPFs吸附三氟氯氰菊酯的平衡与动力学行为。结果表明,准一级动力学方程与Langmuir等温方程分别较好地拟合了吸附动力学与平衡数据(相关性系数(R2)>0.99),证明了吸附过程是一个单分子层的化学吸附过程。298 K时MPFs对三氟氯氰菊酯的吸附平衡时间和饱和吸附容量分别为240 min和23.98μmol?g~(-1),且吸附容量随着温度与三氟氯氰菊酯初始浓度的升高而逐渐增大。研究证明了水中呈悬浮状态的MPFs是理想和稳定的吸附剂,可有效去除水溶液中疏水性有机污染物。
The O / W Pickering high internal phase emulsions (HIPEs) were prepared by using natural clay halloysite nanotubes and a small amount of nonionic surfactant Tween 80 as the emulsifier, and were used as templates to prepare macropores Polymeric foams (MPFs). MPFs have open macroporous structures, rich internal cross-linked channels and hydrophilic surfaces, and are suspended in water, all of which are favorable for the adsorption of pyrethroid pesticides in water systems. Combined with static adsorption experiments, the equilibrium and kinetic behaviors of cyhalothrin by MPFs were studied. The results show that the adsorption kinetics and equilibrium data (correlation coefficient (R2)> 0.99) fit well to the quasi-first-order kinetic equation and the Langmuir isotherm equation, respectively, and prove that the adsorption process is a monomolecular chemisorption process . At 298 K, the equilibration time and saturated adsorption capacity of cyhalothrin by MPFs were 240 min and 23.98 μmol? G -1, respectively, and the adsorption capacity increased with the increase of the initial concentration of cyhalothrin . Studies have shown that MPFs suspended in water is an ideal and stable adsorbent, which can effectively remove hydrophobic organic pollutants in aqueous solution.