pH敏感型纳米粒子的制备及其对含油污水的净化  

Preparation of pH-sensitive Nanoparticles and Their Purification of Oily Wastewater

作　　者：谢泽辉 柳建新[1,2] 王同旺 董沅武 徐魏 XIE Ze-hui;LIU Jian-xin;WANG Tong-wang;DONG Yuan-wu;XU Wei(College of Petroleum Engineering,Yangtze University,Wuhan 430100,Hubei,China;Key Laboratory of Oil and Gas Drilling Engineering in Hubei Province,Wuhan 430100,Hubei,China)

机构地区：[1]长江大学石油工程学院,湖北武汉430100 [2]湖北省油气钻采工程重点实验室,湖北武汉430100

出　　处：《精细化工》2018年第11期1935-1941,共7页Fine Chemicals

基　　金：湖北省自然科学基金面上项目(2017CFB486);2016年湖北省大学生创新创业训练项目(2016098);2017年中国科学院大学生创新实践训练计划(201717001991)~~

摘　　要：首先采用共同沉淀法制备了Fe3O4磁性纳米粒子,再通过正硅酸四乙酯水解包覆在其表面形成SiO2壳层,最后将硅烷偶联剂KH-550在Fe3O4@SiO2上进行接枝改性,得到了表面氨基功能化的磁性纳米粒子（A-MNPs）。通过TEM、FTIR、VSM对纳米粒子的微观形貌、化学组成、磁学性能进行了测试,并将其应用于油田含油污水的净化处理。结果显示：表面氨基化的结构使A-MNPs具有pH敏感性,因此可通过改变pH实现A-MNPs的重复使用,当pH=4时A-MNPs达到最佳除油效果。当A-MNPs浓度为200 mg/L时便可将模拟含油污水透光度提高到99.4%;500mg/L的A-MNPs重复使用10次后仍可使净化后含油污水的透光度保持在80%以上;A-MNPs对由不同浓度的氯化钠、高岭土、乳化油、部分水解聚丙烯酰胺（HPAM）组成的多种模拟污水也有较好的净化效果,375 mg/L的A-MNPs可使含油质量浓度10 g/L复杂模拟污水透光度达到86.5%以上。Fe3O4 magnetic nanoparticles were first prepared by chemical coprecipitation method, and then SiO2 was coated on Fe3O4 nanoparticles by hydrolyzation of tetraethyl orthosilicate. Subsequently, amino-functionalized magnetic nanoparticles（A-MNPs） were obtained by grafting KH-550 on the Fe3O4@SiO2. The microscopic morphology, chemical composition and magnetic properties of nanoparticles were tested by TEM, FTIR and VSM. Next, A-MNPs were applied to purify oily wastewater. It was found that surface amino-functionalization of A-MNPs can improve their pH-sensitivity, thus, the reuse of A-MNPs can be realized by changing pH value. When the pH value of solution was 4, A-MNPs exhibited the best oil removal effect. When the concentration of A-MNPs was 200 mg/L, the light transmittance of the simulated oily wastewater was 99.4%. However, when the concentration of A-MNPs was 500 mg/L, the transmittance could be kept above 80% even after 10 times of repeated use. In addition, A-MNPs had better purification effects for various simulated sewage composed of different concentrations of sodium chloride, kaolinite, emulsified oil and partially hydrolyzed polyacrylamide（HPAM）. 375 mg/L A-MNPs could make the light transmittance of complex sewage reach more than 86.5% after purification.

关 键 词：含油污水 磁性纳米粒子 PH敏感性 重复使用 水处理技术 

分 类 号：X74[环境科学与工程—环境工程]