【摘要】 利用十二烷基苯磺酸钠改性的水滑石（SDBS@LDHs）与磁性粒子Fe₃O₄共沉淀作用,得到Fe₃O₄@SDBS@LDHs磁性复合材料。XRD、FT-IR、SEM/EDS等表征结果表明,Fe₃O₄@SDBS@LDHs的分散性得到了提高,SDBS对LDHs的改性在LDHs层板表面进行。在吸附平衡后,磁性复合材料对灿烂绿的吸附量达到329.1 mg/g。热力学参数表明,吸附过程为自发吸热反应,且温度越高,反应速率越快。吸附过程的热力学符合Langmuir等温吸附模型,属于单分子层吸附;吸附动力学符合准二级动力学模型。吸附剂在4次循环后仍具有较好的吸附能力。此外,磁性复合物更容易从水溶液中分离。这表明,在环境应用方面Fe₃O₄@SDBS@LDHs可以作为一种潜在的吸附剂从水溶液中去除灿烂绿。更多还原

【Abstract】 The magnetic composite-materials（Fe₃O₄@SDBS@LDHs） were prepared by sodium dodecyl benzene sulfonate（SDBS） modified layered double hydroxides（SDBS@LDHs） with Fe₃O₄ via co-precipitation method. The results of XRD, FT-IR and SEM/EDS indicated that the dispersibility of LDHs was improved, and the modification of SDBS took place on the surface of LDHs. The adsorption capacity of Fe₃O₄@SDBS@LDHs to brilliant green（BG） reaches 329.1 mg/g after the adsorption equilibrium. The thermodynamic parameters indicated that the adsorption process was endothermic and spontaneous, and the rate of a reaction increased with the raise of the reaction temperature. The Langmuir model was applicable for describing the sorption isotherms, indicating that the adsorption process is a monolayer adsorption. The results of kinetics study showed that adsorption fitted the pseudo-second order model well. The adsorbents still have good adsorption performance after four adsorption cycles. Moreover, the magnetic composite could be easily separated from aqueous solution. This indicated that Fe₃O₄@SDBS@LDHs can be considered as potential adsorbents in environmental applications for the removal of BG from aqueous solutions.更多还原