Luna Quinto Miguel, Khan Sabir, Vega-Chacón Jaime, Mortari Bianca, Wong Ademar, Taboada Sotomayor Maria Del Pilar, Picasso Gino
Technology of Materials for Environmental Remediation Group (TecMARA), Faculty of Sciences, National University of Engineering, Lima 15333, Peru.
Institute of Chemistry, State University of São Paulo (UNESP), Araraquara 14800-900, SP, Brazil.
Polymers (Basel). 2023 Sep 8;15(18):3709. doi: 10.3390/polym15183709.
In this paper, we present an alternative technique for the removal of Brilliant Green dye (BG) in aqueous solutions based on the application of molecularly imprinted polymer (MIP) as a selective adsorbent for BG. The MIP was prepared by bulk radical polymerization using BG as the template; methacrylic acid (MAA) as the functional monomer, selected via computer simulations; ethylene glycol dimethacrylate (EGDMA) as cross-linker; and 2,2'-azobis(2-methylpropionitrile) (AIBN) as the radical initiator. Scanning electron microscopy (SEM) analyses of the MIP and non-molecularly imprinted polymer (NIP)-used as the control material-showed that the two polymers exhibited similar morphology in terms of shape and size; however, N sorption studies showed that the MIP displayed a much higher BET surface (three times bigger) compared to the NIP, which is clearly indicative of the adequate formation of porosity in the former. The data obtained from FTIR analysis indicated the successful formation of imprinted polymer based on the experimental procedure applied. Kinetic adsorption studies revealed that the data fitted quite well with a pseudo-second order kinetic model. The BG adsorption isotherm was effectively described by the Langmuir isotherm model. The proposed MIP exhibited high selectivity toward BG in the presence of other interfering dyes due to the presence of specific recognition sites (IF = 2.53) on its high specific surface area (112 m/g). The imprinted polymer also displayed a great potential when applied for the selective removal of BG in real river water samples, with recovery ranging from 99 to 101%.
在本文中，我们提出了一种基于应用分子印迹聚合物（MIP）作为亮绿染料（BG）的选择性吸附剂来去除水溶液中BG的替代技术。以BG为模板，通过本体自由基聚合法制备MIP；通过计算机模拟选择甲基丙烯酸（MAA）作为功能单体；乙二醇二甲基丙烯酸酯（EGDMA）作为交联剂；2,2'-偶氮二异丁腈（AIBN）作为自由基引发剂。对用作对照材料的MIP和非分子印迹聚合物（NIP）进行扫描电子显微镜（SEM）分析表明，两种聚合物在形状和尺寸方面呈现出相似的形态；然而，吸附研究表明，与NIP相比，MIP的BET表面积要高得多（大三倍），这清楚地表明前者形成了足够的孔隙率。从傅里叶变换红外光谱（FTIR）分析获得的数据表明，基于所应用的实验程序成功形成了印迹聚合物。动力学吸附研究表明，数据与拟二级动力学模型拟合得很好。BG吸附等温线可以用朗缪尔等温线模型有效地描述。由于其高比表面积（112 m/g）上存在特异性识别位点（IF = 2.53），所提出的MIP在存在其他干扰染料的情况下对BG表现出高选择性。当应用于实际河水样品中BG的选择性去除时，印迹聚合物也显示出巨大的潜力，回收率在99%至101%之间。
