Zhang Yuzhe, Bian Tingting, Xia Da, Wang Dandan, Zhang Yi, Zheng Xudong, Li Zhongyu
School of Environmental and Safety Engineering, Changzhou University Changzhou 213164 PR China
Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University Changzhou 213164 PR China.
RSC Adv. 2019 Apr 29;9(23):13065-13076. doi: 10.1039/c9ra00773c. eCollection 2019 Apr 25.
Although bio-materials are widely used for the adsorption of heavy metal ions, they have low specific surface area, slow adsorption rates, and poor selectivity. To overcome these limitations, in this study, we report a 3D-ordered macroporous ion-imprinted chitosan film (3DOM-IICF); the 3DOM-IICF coupled with a colloidal crystal template and ion imprinting (IIP) technology has been used to absorb copper ions (Cu(ii)) present in water. Moreover, polystyrene (PS) micro-spheres and copper templates were added to form a three-dimensional ordered macroporous structure and ion-imprinted sites, respectively. Finally, the film was formed by drying. Adsorption experiments showed the removal of Cu(ii) from the 3DOM-IICF in an aqueous solution. The 3DOM-IICF exhibited good adsorption performance under neutral conditions of pH = 7.0, and the adsorption efficiency was high. The maximum adsorption capacity of the 3DOM-IICF was 261.31 mg g. The adsorption processes were more consistent with the pseudo-second-order kinetic model and the Langmuir isotherm. The 3DOM-IICF exhibits superior selective adsorption of Cu(ii). Moreover, the 3DOM-IICF could be regenerated multiple times, reused as an adsorbent and maintained high adsorption capacity. This kind of imprinted template method has important significance in the selective adsorption of pollutants in bio-materials and is worthy of in-depth research.
尽管生物材料被广泛用于吸附重金属离子，但其比表面积低、吸附速率慢且选择性差。为克服这些局限性，在本研究中，我们报道了一种三维有序大孔离子印迹壳聚糖膜（3DOM-IICF）；3DOM-IICF结合胶体晶体模板和离子印迹（IIP）技术用于吸附水中存在的铜离子（Cu(ii)）。此外，添加聚苯乙烯（PS）微球和铜模板分别形成三维有序大孔结构和离子印迹位点。最后，通过干燥形成膜。吸附实验表明3DOM-IICF能从水溶液中去除Cu(ii)。3DOM-IICF在pH = 7.0的中性条件下表现出良好的吸附性能，且吸附效率高。3DOM-IICF的最大吸附容量为261.31 mg/g。吸附过程更符合准二级动力学模型和朗缪尔等温线。3DOM-IICF对Cu(ii)表现出优异的选择性吸附。此外，3DOM-IICF可多次再生，作为吸附剂重复使用并保持高吸附容量。这种印迹模板法在生物材料中污染物的选择性吸附方面具有重要意义，值得深入研究。
