The ion-imprinted oyster shell material for targeted removal of Cd(II) from aqueous solution.
The ion-imprinted oyster shell material for targeted removal of Cd(II) from aqueous solution.
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DOI：
10.1016/j.jenvman.2021.114031
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发表时间：
2021-11
影响因子：
8.7
通讯作者：
Shurong Wu;L. Liang;Qin Zhang;L. Xiong;Shui-He Shi;Zibin Chen;Zexiang Lu;Liwei Fan
中科院分区：
文献类型：
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作者：
Shurong Wu;L. Liang;Qin Zhang;L. Xiong;Shui-He Shi;Zibin Chen;Zexiang Lu;Liwei Fan
为了实现废弃牡蛎壳的可持续利用，开发有针对性的镉去除技术。采用表面印迹技术制备了一种新型离子印迹牡蛎壳材料(IIOS)。用扫描电子显微镜、傅里叶红外光谱仪、X射线衍射仪、热重分析和氮气吸附-脱附等手段对样品进行了表征。通过单因素序批法、动力学实验、等温线实验、选择性实验和循环实验研究了iIOS对水溶液中Cd(II)的吸附性能。表征研究表明，iIOS制备成功。吸附实验表明，吸附过程在240min内达到平衡，最大吸附容量为69.1 mg/g−，初始浓度为75 mg/−，吸附过程符合准二级模型和朗缪尔等温线模型，揭示了Cd(II)的化学吸附特性。此外，由于印迹空穴的存在，iIOS在几种二元竞争体系中对Cd(II)表现出良好的靶向吸附。回收实验表明，iIOS对Cd(II)的靶向去除率在使用6次后仍保持在80%以上。研究结果表明，废牡蛎壳作为离子交换膜处理废水中的重金属具有很好的应用前景。
In order to realize the sustainable utilization of waste oyster shell and develop a targeted removal technology for cadmium. A novel ion-imprinted oyster shell material (IIOS) was prepared by surface imprinting technique. The prepared samples were characterized by scanning electron microscope, Fourier infrared spectrometer, X-ray diffractometer, thermogravimetric analysis and N2adsorption-desorption. The adsorption performances of IIOS for Cd(II) from aqueous solution were studied by the single factor sequential batch, kinetics, isotherms, selectivity and recycling experiments. The characterization researches showed that IIOS was successfully prepared. The adsorption experiments indicated that the adsorption process reached equilibrium within 240 min; the maximum adsorption capacity was up to 69.1 mg g−1with the initial Cd(II) concentration of 75 mg L−1at pH 5; the adsorption process fitted well to the pseudo-second-order model and the Langmuir isotherm model, which revealed the chemisorption characteristic of Cd(II). Moreover, IIOS exhibited a good targeted adsorption of Cd(II) in several binary competition systems owing to the present of these imprinted cavities. The recycling experiment showed that the targeted removal ratio of IIOS for Cd(II) remained above 80% after used six times. The results of this study indicated that it is a promising prospect for waste oyster shell used as IIOS to dispose heavy metals in wastewater.