摘要
为去除水体中不同类型污染物,制备了一种多功能的多壁碳纳米管(MWCNTs)/纳米四氧化三铁(Fe_3O_4)-聚乙烯醇(PVA)微球(MWCNTs/Fe_3O_4-PVA)微球,并对MWCNTs/Fe_3O_4-PVA微球进行了表征,探索MWCNTs/Fe_3O_4-PVA微球对铜离子(Cu~(2+))和磺胺嘧啶(SM)的吸附性能。研究结果表明:制得的MWCNTs/Fe_3O_4-PVA微球饱和磁通量为16.18eum/g;在初始温度为25℃,MWCNTs/Fe_3O_4-PVA微球用量为1g/L条件下,Cu~(2+)溶液初始pH=10,吸附平衡时间为4h,MWCNTs/Fe_3O_4-PVA微球对Cu~(2+)的吸附率最高达到96.5%,平衡吸附量达到76mg/g;SM溶液初始pH=4,吸附平衡时间为2h,MWCNTs/Fe_3O_4-PVA微球对SM的吸附率最高达到65.9%,平衡吸附量达到43mg/g。制得的MWCNTs/Fe_3O_4-PVA微球对Cu~(2+)和SM具有较好的吸附性能。
Multi-walled carbon nanotubes(MWCNTs)and Fe_3O_4 nanoparticles-polyvinyl alcohol(Fe_3O_4-PVA)microspheres were composited to adsorb different kinds of water pollutants.MWCNTs/Fe_3O_4-PVA were developed via three steps:1.Fe_3O_4-PVA microspheres prepared by the inverse suspension cross-linked reaction were animated;2.MWCNTs were carboxylated;3.through the esterification reaction,MWCNTs and Fe_3O_4-PVA microspheres were composited.The morphology,composition and magnetism of MWCNTs/Fe_3O_4-PVA were characterized by FT-IR,XPS and VSM.The application of adsorption properties on copper ions and sulfadiazine in water were investigated.The results showed that MWCNTs/Fe_3O_4-PVA with saturation magnetization intensity of 16.18 emu/g were prepared successfully.The adsorption balance time for copper ions and sulfadiazine was 4 hand 2 h(T=25℃,the dosage was1 g/L)respectivelly.For copper ions,the maximal adsorption rate was 96.5%(pH=10)and the adsorption capacity was 76 mg/g(pH=10).While for sulfadiazine,the maximal adsorption rate was 65.9%(pH=4)and the adsorption capacity was 43 mg/g(pH=4).
引文
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