(沈阳工业大学 理学院，沈阳 110870)
摘 要: 膨润土对重金属离子等污染物具有良好的吸附性能，但吸附饱和后将成为危险固废，处理变成棘手问题，研究其再生循环利用具有较大的经济价值，可为其高效利用提供了有力借鉴和参考。采用NaCl溶液为解吸液，以磁性膨润土为吸附剂，探索Cr(Ⅵ)的解吸条件，并采用XRD、FTIR、BET和SEM表征再生前后样品的结构及形貌，研究材料的稳定性。结果表明：磁性膨润土具有良好的循环使用性能；经过6次吸附-解吸后，磁性膨润土仍保持稳定结构；其解吸过程符合准二级动力学与Langmuir等温方程。
关键字: 磁性膨润土；Cr(Ⅵ)离子；解吸再生
（School of Science, Shenyang University of Technology, Shenyang, 110870, China）
Abstract:Bentonite has good performance on adsorption of heavy metals and other pollutions. However, it become hazardous solid waste after saturation adsorption and its treatment is a difficult problem. The useful experiences and strong reference for its high effective utilization will be provided. It will take great scientific and economic value to study the regeneration recycling. Desorption regeneration of magnetic bentonite with NaCl desorption solution was studied after Cr(Ⅵ) was adsorbed onto it. The effects of desorption, such as pH and temperature, were explored. The physical or chemical feature of regenerated magnetic bentonite and the original were comparatively analyzed by XRD, FTIR, BET and SEM. The research results show that magnetic bentonite still remains stable structure after repeating six adsorption- desorption cycles. The desorption process better conforms to the second-order kinetic equation and the Langmuir model.
Key words: magnetic bentonite; Cr(Ⅵ) ions; desorption regeneration
