纳米SiO2粒子表面接枝共聚合物微球的制备及其吸附Cu2+性能
Preparation of nano-SiO2 particle surface-grafted copolymer microspheres and its adsorption performance for Cu2+
王美荣 1林凌 1许爱 2熊贵霞 1罗云翔1
作者信息
- 1. 西南石油大学 化学化工学院,四川 成都 610500
- 2. 中石化华北石油工程有限公司 五普钻井分公司,河南 新乡 453700
- 折叠
摘要
采用KH570 对纳米SiO2 进行改性,将其作为Pickering乳液的稳定剂;利用反相(Pickering)乳液聚合法制备SiO2@丙烯酰胺(AM)-丙烯酸(AA)共聚物复合微球,并对改性前后纳米SiO2 以及复合微球的结构、形貌及质量损失进行了表征;探究pH值、温度和单体比例对复合微球吸附Cu2+效果影响,并对吸附过程进行动力学和吸附等温线拟合.结果表明,改性后的纳米SiO2 亲油性增强,提高稳定乳液的能力;Cu2+吸附实验表明,复合微球吸附的最佳pH值为6,且吸附量随着AA用量增加而增大;复合微球吸附Cu2+的过程符合准二级动力学模型和Langmuir模型.
Abstract
Nano-SiO2 was modified by KH570,which was used as the stabilizer of Pickering emulsion;SiO2@Acrylamide(AM)-acrylic acid(AA)copolymer composite microspheres were prepared by inverse phase(Pickering)emulsion polymerization.The structure,morphology,and mass loss of the prepared composite microspheres and nano-SiO2 before and after modification were characterized.The effects of pH,temperature and monomer ratio on the adsorption of Cu2+by composite microspheres were studied,and the kinetics and isothermo of the adsorption process were fitted at the same time.The results showed that the modified nano-SiO2 had enhanced lipophilicity and improved the ability to stabilize the emulsion;the Cu2+adsorption experiment showed that the optimum pH value for the adsorption of composite micro-spheres was 6,and the adsorption amount increased with the increase of AA dosage.The fitting results of the adsorption process of Cu2+by the spheres showed that they fit the pseudo-second-order kinetic model and the Langmuir model.
关键词
改性纳米SiO2/Pickering乳液/复合微球/吸附/Cu2+Key words
modified nano-SiO2/Pickering emulsion/composite microspheres/adsorption/Cu2+引用本文复制引用
基金项目
国家自然科学基金面上项目(5237041601)
出版年
2024
NETL
NSTL
万方数据