高内相乳液法制备聚丙烯酰胺多孔水凝胶及应用

doi:10.16085/j.issn.1000-6613.2021-1793

摘要/Abstract

摘要：

以亲水性二氧化硅纳米粒子（N20）和乳化剂Tween80为复合稳定剂，环己烷为油相制备高内相乳液，再以此乳液为模板制备聚丙酰胺（PAM）多孔水凝胶。乳液光学显微镜照片及PAM多孔水凝胶SEM照片表明N20用量及Tween80用量对材料孔径形貌及直径有直接影响；压汞仪数据表明当N20用量为3%、Tween80用量为9%时，多孔水凝胶平均孔径为38.06nm，孔隙率为77.54%，20h饱和吸水率可达402g/g；吸附实验表明PAM多孔水凝胶对Mn(Ⅱ)具有良好的吸附性能，吸附过程符合准二级动力学方程，属于化学吸附，当溶液pH为4时，120min可达吸附饱和，吸附量为474.64mg/g。

关键词: 高内相乳液, 多孔水凝胶, 聚丙烯酰胺, Mn(Ⅱ)吸附

Abstract:

Hydrophilic silica nanoparticles (N20) and emulsifier Tween80 were used as composite stabilizers and cyclohexane as oil phase to prepare high internal phase emulsions (HIPEs). Polyacrylamide (PAM) porous hydrogel was prepared by polymerizing acrylamide in the outer phase with this emulsion as template. The optical microscope photographs of HIPEs and the SEM images of PAM porous hydrogel showed that the amount of N20 and Tween80 affectted the pore appearance and diameter of the material. Mercury injection apparatus results showed that the average pore size of porous hydrogel was 38.06nm, the porosity was 77.54%, and the saturated water absorption rate of 20h reached 402g/g when the dosage of N20 was 3% and Tween80 was 9%. Adsorption experiments showed that PAM porous hydrogel has good adsorption properties for Mn(Ⅱ). The adsorption process conforms to the quasi second-order kinetic equation and belongs to chemical adsorption. When the solution pH was 4, the adsorption saturation reached in 120min and the adsorption amount was 474.64mg/g.

Key words: high internal phase emulsions, porous hydrogel, polyacrylamide, Mn(Ⅱ) adsorption

中图分类号:

O648.17

常炜, 史秋兰, 赵正阳, 王瑞婷, 王志福, 赵俭波. 高内相乳液法制备聚丙烯酰胺多孔水凝胶及应用[J]. 化工进展, 2022, 41(7): 3832-3839.

CHANG Wei, SHI Qiulan, ZHAO Zhengyang, WANG Ruiting, WANG Zhifu, ZHAO Jianbo. Preparation and application of polyacrylamide porous hydrogel by high internal phase emulsion polymerization[J]. Chemical Industry and Engineering Progress, 2022, 41(7): 3832-3839.

图/表 13

图1 PAM多孔水凝胶制备过程示意图

表1 PAM多孔水凝胶平均孔径及孔隙率

样品编号	N20质量分数/%	吐温80质量分数/%	平均孔径 /nm	孔隙率 /%
1	3	6	67.54	82.25
2	3	9	38.06	77.54
3	2	6	30.55	65.73
4	4	6	232.41	43.8

图2 高内相乳液显微形貌照片

图3 PAM多孔水凝胶SEM照片

图4 PAM多孔水凝胶孔径分布曲线

图5 PAM水凝胶平衡溶胀率曲线

表2 PAM水凝胶平衡溶胀动力学拟合结果

样品编号	K₁	SR₁	R²
1	0.772	37888.36	0.936
2	0.713	37907.90	0.930
3	0.925	33341.50	0.962
4	0.879	31334.22	0.964
5	0.364	28792.89	0.897

图6 pH对PAM多孔水凝胶和传统PAM多孔水凝胶吸附量的影响

图7 PAM多孔水凝胶再生吸附

图8 PAM多孔水凝胶和传统PAM水凝胶的吸附时间曲线

表3 PAM多孔水凝胶的Mn(Ⅱ)吸附动力学参数

实验值Q_e

/mg·g^-1

K₁/min^-1

R²

R²

图9 准一级动力学拟合曲线

图10 准二级动力学拟合曲线

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