阴离子聚电解质修饰磁性氧化石墨烯对碱性品红的吸附性能

Adsorption performance of an anionic polyelectrolyte-functionalized magnetic graphene oxide for basic fuchsin

采用简便一步溶剂热法制备了一种阴离子聚电解质聚(4-苯乙烯磺酸-共聚-顺丁烯二酸)钠盐(PSSMA)修饰的磁性氧化石墨烯复合材料(M-r GO/PSSMA),并将其用作水溶液中阳离子型染料碱性品红(BF)去除的吸附剂。采用FTIR、SEM、TEM、TGA、VSM、DLS对制备的M-r GO/PSSMA进行表征。考察了溶液p H、吸附时间以及染料初始浓度对BF在M-r GO/PSSMA及M-r GO上吸附性能的影响;探讨了等温吸附过程、吸附动力学以及吸附机理。研究表明,M-r GO表面PSSMA的接枝可有效提高其对BF的吸附容量。PSSMA修饰后的磁性氧化石墨烯对BF的最大吸附容量高达588.2mg/g,是未经PSSMA修饰M-r GO吸附容量的3倍。另外,M-r GO/PSSMA对BF的吸附动力学和吸附等温数据分别符合准二级吸附动力学模型和Langmuir等温吸附模型。利用Na OH的乙醇溶液可对M-r GO/PSSMA进行有效的再生;通过外加磁场作用可实现吸附剂的回收再利用。本文所制备的石墨烯基复合材料可望成为环境废水中阳离子污染物去除的优良吸附剂。

A novel anionic polyelectrolyte poly（4-styrenesulfonic acid-co-maleic acid）sodium（PSSMA）functionalized magnetic graphene oxide composite（M-r GO/PSSMA）was prepared via a simple and facile one-step solvothermal method,and it was then used for removal of a cationic dye（basic fuchsin,BF）from aqueous solution. The resulted M-r GO/PSSMA was characterized by FTIR,SEM,TEM,TGA,VSM and DLS. Batch adsorption studies were carried out to investigate effects of the solution p H,adsorption time and initial dye concentration on the adsorption performances of BF onto the M-r GO/PSSMA. The adsorption isotherms,kinetics and mechanisms were also studied. Results indicated that the grafting of PSSMA onto the surface of M-r GO could effectively enhance the adsorption capacity of BF. The maximum adsorption capacity of BF onto the M-r GO/PSSMA was 588.2mg/g,and was nearly three times as much as that of M-r GO. Furthermore,the BF adsorption onto the M-r GO/PSSMA fitted the pseudo-second-order kinetic and Langmuir model well,respectively. The as-synthesized composite could be effectively separated and recovered under an external magnetic field,and regenerated for reuse by using Na OH ethanol solution. Such a graphene-based composite can be used as an excellent adsorbent for removing cationic pollutants from environmental wastewater.