磁性多级结构镍铝氧化物的制备及其对染料吸附性能的研究

采用离子液体辅助尿素法合成了多级结构的NiAl-LDH(水滑石), 通过焙烧处理得到花状结构的复合金属氧化物(MMO). 对所合成样品进行罗丹明B吸附实验, 结果表明焙烧产物MMO 由于自身丰富的孔结构对废水溶液中的染料吸附具有较强的吸附效果; 更重要的是通过800℃焙烧处理得到MMO 样品具有较强磁性, 这种磁性吸附剂不仅可以实现对废水中染料的高效吸附, 同时由于自身磁性, 在外加磁场的作用下易于实现吸附剂的可循环利用. 

Magnetic NiAl-mixed metal oxide with hierarchical structure for dye adsorption

Hierarchical NiAl-layered double hydroxide (LDH) microspheres with flower-like structure were synthesized by a facile and cost-effective ionic liquid assisted hydrothermal method.The magnetic mixed metal oxide (MMO) was obtained by calcinations of hierarchical NiA1-LDH,which demonstrated excellent sorption capacity for rhodamine B.XRD pattern,scanning and transmission electron microscopy images revealed that the obtained MMO microspheres displayed a three-dimensional architecture with flower-like structure.The N2 adsorption-desorption isotherms illustrated that the MMO sample displayed large specific surface area.Prepared MMO as adsorbent exhibited significantly sorption capacity for rhodamine B,much larger than conventional LDHs powdered samples.MMO exhibited excellent sorption-regeneration performances compared with previous reported sample.This will facilitate its repeatable and cyclic usage over a long period,including high activity,long-term durability and cycling stability,owing to excellent magnetic behavior of NiA1-MMO.Therefore,this work provides a promising approach for the design and synthesis of flower-like structured materials with large surface area and high magnetic behavior,which can be potentially used in water treatment,catalysis and even water splitting into hydrogen.