In this study,a magnetic adsorbent,Fe3O4@SiO2-NH2,with a saturation magnetization ranging from 15.8 to 56.8 emu/g,was synthesized.The effects of external magnetic field intensity,contact time,recycling number,saturation magnetization,and water-to-soil ratio on the recovery efficiency of the magnetic adsorbent from soil were investigated.Single-factor experiments indicated that all factors except the water-to-soil ratio significantly affected the recovery efficiency.A response surface methodology was employed to establish a predictive model for recovery efficiency (P<0.001,R2=0.993 8),and the order of influence was determined as follows:recycling number>contact time>saturation magnetization>external magnetic field intensity.The optimal conditions for recovery efficiency were as follows:magnetic field intensity of 0.3 T,contact time of 30 seconds,four recycling cycles,and saturation magnetization of 32.2 emu/g.Under these conditions,the predicted recovery efficiency was 98.74%,and the experimentally verified value was (97.53±1.36) %,which is in excellent agreement with the predicted value.
$\begin{array}{c} Y=+91.57+1.06 A+5.27 B+25.54 C+2.30 D+ \\ 1.08 A B-1.00 A C-2.57 A D-3.89 B C-1.22 B D- \\ 1.52 C D-1.02 A^{2}+0.54 B^{2}-20.05 C^{2}+0.53 D^{2} \end{array}$
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