沙柳基磁性多孔炭的制备及其吸附亚甲基蓝性能研究

Preparation of magnetic porous carbon from Salix and adsorption properties for methylene blue

采用水热法原位改性沙柳生物炭制备磁性多孔炭复合材料,利用SEM、XRD、FT-IR、XPS和BET分别对多孔炭的形貌、结构表征,并研究磁性多孔炭吸附去除废水中亚甲基蓝性能。系列表征分析结果表明磁性复合材料表面疏松多孔,比表面积为63.01 m^(2)/g,含有-COOH、-OH等丰富的官能团。在亚甲基蓝初始质量浓度为50 mg/L、初始pH值为11,投加量为2 g/L、25℃吸附120 min时,亚甲基蓝的吸附率可达88.52%,最大吸附量为218.08 mg/g;吸附过程与Langmuir吸附等温模型拟合较好,符合准二级吸附动力学模型。吸附以化学吸附为主,吸附稳定,无二次污染,吸附剂廉价易得,便于分离,是理想的亚甲蓝废水处理试剂。

The magnetic porous carbon composites(nano-Fe3O4/SAC)are prepared by nano-Fe3O4 modified salix activated carbon via in-situ hydrothermal method.The adsorption performance of methylene blue(MB)aqueous solution on nano-Fe3O4/SAC is studied.The results of XRD,SEM,FT-IR,XPS and BET revealed that the surface of the magnetic composite is loose and porous,with a specific surface area of 63.01 m^(2)/g and rich functional groups such as-COOH and-OH.When the initial concentration of methylene blue is 50 mg/L,the pH is 11,dosage of Nano-Fe3O4/SAC is 2 g/L,and the adsorption time is 120 min at 25℃,the MB removal rate could reach over 88.52%,and the maximum adsorption capacity is 218.08 mg/g.The adsorption process fits well with Langmuir adsorption isotherm model and Pseude-secondary kinetics model.The adsorption is mainly chemical adsorption with stable adsorption and no secondary pollution.The adsorbent is cheap,easy to obtain and easy to separate,which is an ideal reagent for methylene blue wastewater treatment.