采用水热法制备NiCr水滑石，然后将水滑石与磁性基质Fe₃O₄进行组装，合成磁性NiCr水滑石。通过XRD、SEM、FT-IR、BET、VSM等手段对Fe₃O₄/NiCr-LDHs的性能进行了表征。以刚果红为目标污染物，考察了吸附时间、溶液初始pH、吸附剂投加量、溶液初始质量浓度等对吸附效果的影响，并对吸附动力学、等温线、吸附热力学进行了探讨。结果表明，在25℃、pH 4.5条件下，0.050 g的Fe₃O₄/NiCr-LDHs对质量浓度为50 mg/L的刚果红去除率达96.68%。吸附动力学和热力学研究表明，磁性NiCr水滑石对刚果红的吸附符合Langmuir等温吸附方程，吸附动力学符合准二级动力学模型，吸附过程是自发进行，且在外部磁场作用下该磁性NiCr水滑石能够实现快速分离回收。

NiCr hydrotalcite is prepared via hydrothermal method,and then assembled with spherical Fe₃O₄ nanoparticles to synthesize magnetic NiCr hydrotalcite.The magnetic composite is characterized by XRD,SEM,FT-IR,BET and VSM procedures.By using Congo red as the model organic pollutant,the effects of adsorption time,the initial pH of solution,the dosage of adsorbent and the initial concentration of solution on the adsorption efficiency are researched.The kinetics,isotherm and thermodynamics of adsorption are also explored.The results show that the removal rate of Congo red with an initial concentration of 50 mg·L^-1 reaches 96.68% under conditions of pH 4.5,25℃ and 0.05 g of Fe₃O₄/NiCr-LDHs.Study on adsorption kinetic and thermodynamics indicates that the adsorption process can be described by using Langmuir and the pseudo-second-order kinetics model,and the adsorption process is exothermic.Under the action of external magnetic field,the magnetic NiCr hydrotalcite can realize rapid separation and recovery.

廖琴瑶(1993-),女,硕士研究生,研究方向为环境监测及环境功能材料,lqyw168@163.com