Xie Chunsheng, Wei Shoulian, Chen Dan, Lan Wenying, Yan Zijun, Wang Zhenxing
College of Environmental and Chemical Engineering, Zhaoqing University Zhaoqing 526061 China
South China Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China Guangzhou 510655 China
RSC Adv. 2019 Jul 29;9(41):23474-23483. doi: 10.1039/c9ra03859k.
In this work, a magnetic ion imprinted polymer (MIIP) with specific recognition capability toward cadmium was prepared by a sol-gel method using waste beer yeast, which is a macromolecule biomass, as a functional monomer. The obtained Cd(ii)-MIIP was characterized using scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy and adsorption experiments. Then, a MIIP adsorbent based magnetic solid phase extraction (MSPE)-graphite furnace atomic absorption (GFAA) method was established to analyze the cadmium content in food and environmental samples. The maximum cadmium adsorption capacities by the MIIP and magnetic non-imprinted polymer (MNIP) were 62.74 and 32.38 mg g, respectively. The absorption by the MIIP was fitted using a pseudo-second-order kinetic model. The Cd(ii)-MIIP demonstrated superior absorption capability for selective removal cadmium. The recovery rate of the MIIP was 90.7% after four adsorption-desorption cycles. The calculated Cd(ii) detection limit (S/N = 3) was 0.18 μg L with the relative standard deviation (RSD) equal to ∼3.5% for 10 μg L of Cd(ii) standard solution. Our proposed method was successfully used in detecting Cd(ii) in aqueous samples. The results obtained in this work suggest that the Cd(ii)-MIIPs might be promising adsorbents to remove harmful cadmium ions from aqueous samples.
在本研究中，以废弃啤酒酵母这种大分子生物质为功能单体，采用溶胶 - 凝胶法制备了对镉具有特异性识别能力的磁性离子印迹聚合物（MIIP）。利用扫描电子显微镜（SEM）、傅里叶变换红外（FTIR）光谱和吸附实验对所得的Cd（ii）-MIIP进行了表征。然后，建立了一种基于MIIP吸附剂的磁性固相萃取（MSPE）-石墨炉原子吸收（GFAA）法，用于分析食品和环境样品中的镉含量。MIIP和磁性非印迹聚合物（MNIP）对镉的最大吸附容量分别为62.74和32.38 mg/g。MIIP的吸附过程符合准二级动力学模型。Cd（ii）-MIIP在选择性去除镉方面表现出优异的吸附能力。经过四个吸附 - 解吸循环后，MIIP的回收率为90.7%。对于10 μg/L的Cd（ii）标准溶液，计算得到的Cd（ii）检测限（S/N = 3）为0.18 μg/L，相对标准偏差（RSD）约为3.5%。我们提出的方法成功用于检测水样中的Cd（ii）。本研究结果表明，Cd（ii）-MIIP可能是从水样中去除有害镉离子的有前景的吸附剂。
