An environmentally friendly dual-template magnetic ion imprinted polymer (DMIIP) of Cd²⁺ and Pb²⁺ were prepared by surface imprinting technique combined with a sol-gel process using Cd²⁺ and Pb²⁺ as dual-templates, papain as a functional monomer and magnetic mesoporous Fe₃O₄@mSiO₂ as substrate. The Polymer was characterized using scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and adsorption experiments. Maximum adsorption capacities of DMIIP were 41.69 for Cd²⁺ and 76.39 mg/g for Pb²⁺ in a mixed solution. We also studied factors affecting adsorption and desorption of Cd²⁺ and Pb²⁺. DMIIP clearly demonstrates a stronger ability than dual-template magnetic none-ion imprinted polymer (DMNIP) to selectively adsorb Cd²⁺ and Pb²⁺ from solutions containing other metal ions. Absorption by DMIIP was well fitted with a pseudo-second-order kinetic model. After eight adsorption-desorption cycles, adsorption capacity of DMIIP relative to Cd²⁺ and Pb²⁺ decreased 6.1% and 6.3%, respectively. The developed MISPE-GFAA method using DMIIP as adsorbent was satisfied to Cd²⁺ and Pb²⁺ determination in soil and food samples. The polymer could be a green and promising adsorbent to remove Cd²⁺ and Pb²⁺ from soil and food samples.

采用表面印迹技术结合溶胶-凝胶法，以Cd ²⁺和Pb ²⁺为双模板，木瓜蛋白酶为模板，制备了Cd ²⁺和Pb ²⁺的环保双模板磁离子印迹聚合物（DMIIP）。官能单体和磁性介孔Fe ₃ O ₄ @mSiO ₂为底物。使用扫描电子显微镜（SEM），傅立叶变换红外（FTIR）光谱，X射线衍射（XRD）和吸附实验对聚合物进行了表征。DMIIP对Cd ^2+的最大吸附容量为41.69，对Pb ²⁺为76.39 mg / g在混合溶液中。我们还研究了影响Cd ²⁺和Pb ²⁺吸附和解吸的因素。DMIIP显然显示出比双模板磁性无离子印迹聚合物（DMNIP）更强的能力，可以从含有其他金属离子的溶液中选择性吸附Cd ²⁺和Pb ²⁺。DMIIP的吸收很好地拟合了伪二级动力学模型。经过八个吸附-解吸循环，DMIIP相对于Cd ²⁺和Pb ^2+的吸附容量分别降低了6.1％和6.3％。使用DMIIP作为吸附剂开发的MISPE-GFAA方法满足Cd ²⁺和Pb ²⁺土壤和食物样品中的测定。该聚合物可能是一种绿色且前景广阔的吸附剂，可以从土壤和食物样品中去除Cd ²⁺和Pb ²⁺。