摘要
采用化学共沉淀法制备了Fe3O4磁性纳米粒子,然后分别用聚乙二醇-6000(PEG-6000)、聚丙烯酰胺(PAM)、十二烷基硫酸钠(K12)、油酸钠(Sodium oleate)对其进行表面修饰。将它们用于处理模拟油田含油含聚污水,考察了不同表面改性、不同粒径、不同磁性的纳米粒子的除油性能;以胜利油田孤三联污水为研究对象,探讨了Fe3O4磁性纳米粒子的助凝性能。结果表明,粒径越小,磁性越强,除油效果越好,采用PEG改性后的磁性纳米粒子除油效果最好;Fe3O4磁性纳米粒子与聚合氯化铝(PAC)、阴离子聚丙烯酰胺(APAM)复配使用时,除油率达95.4%,悬浮物去除率达90.7%,与复配前相比,除油率提高13.7%,悬浮物含量降低31.5%,絮体沉降速率快。Fe3O4磁性纳米粒子的絮凝机理包括吸附、磁絮凝、破乳作用,其与PAC、APAM具有协同作用。
Fe3 O4 magnetic nanoparticles were prepared by chemical co-precipitation, and the prepared magnetic nanoparticles were modified by polyethylene glycol （PEG）, polyacrylamide （PAM）, sodium dodecyl sulfate（K12） and sodium oleate. The oil removal performance of the Fe3 O4nanoparticles with different surface properties, different sizes and different magnetism were examined by treating the simulation oilfield wastewater containing polymers. The coagulationsupporting effect of Fe3 O4 magnetic nanoparticles was investigated by treating the sewage from Shengli Oilfield Gu San Lian. The coagulation mechanism of Fe3 O4 magnetic nanoparticles was also investigated. The results showed that the smaller the nanoparticles were, the better the deoiling effect was. The oil removal rate increased when the magnetism of Fe3 O4 nanoparticles became larger. The deoiling effect of nanoparticles modified by PEG was the best. The oil removal rate was 95.4%, and the suspended solids removal rate was 90.7% when Fe3 O4 magnetic nanoparticles compounded with PAC and APAM were used to treat oilfield wastewater. Compared with the results obtained by PAC and APAM treatment, the oil removal rate was promoted by 13.7%, and the content of suspended solids was decreased by 31.5%, with a higher speed of deoiling. Fe3 O4magnetic nanoparticles had magnetic flocculation, adsorption and demulsification effect，and there was a synergistic effect between Fe3 O4 magnetic nanoparticles and PAC, APAM.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2013年第6期1047-1053,共7页
Acta Petrolei Sinica(Petroleum Processing Section)
关键词
Fe3O4磁性纳米粒子
助凝性能
油田含油含聚污水
絮凝机理
Fe3O4 magnetic nanoparticles
coagulation-supporting effect
oilfield oily wastewater containing polymers
coagulation mechanism
