Royal Society Open Science ( IF 3.5 ) Pub Date : 2021-03-10 , DOI: 10.1098/rsos.201604 S Mamman 1, 2 , F B M Suah 1 , M Raaov 3 , F S Mehamod 4 , S Asman 5 , N N M Zain 6
In this study, a unique magnetic molecularly imprinted polymer (MMIP) adsorbent towards bisphenol A (BPA) as a template molecule was developed by bulk polymerization using β-cyclodextrin (β-CD) as a co-monomer with methacrylic acid (MAA) to form MMIP MAA–βCD as a new adsorbent. β-CD was hybridized with MAA to obtain water-compactible imprinting sites for the effective removal of BPA from aqueous samples. Benzoyl peroxide and trimethylolpropane trimethacrylate were used as the initiator and cross-linker, respectively. The adsorbents were characterized by Fourier transform infrared spectroscopy, scanning electronic microscopy, transmission electron microscopy, vibrating sample magnetometer, Brunauer–Emmett–Teller and X-ray diffraction. 1H nuclear magnetic resonance spectroscopy was used to characterize the MAA–βCD and BPA–MAA–βCD complex. Several parameters influencing the adsorption efficiency of BPA such as adsorbent dosage, pH of sample solution, contact time, initial concentrations and temperature as well as selectivity and reusability study have been evaluated. MMIP MAA–βCD showed significantly higher removal efficiency and selective binding capacity towards BPA compared to MMIP MAA owing to its unique morphology with the presence of β-CD. The kinetics data can be well described by the pseudo second-order kinetic and Freundlich isotherm and Halsey models best fitted the isotherm data. The thermodynamic studies indicated that the adsorption reaction was a spontaneous and exothermic process. Therefore, MMIP based on the hybrid monomer of MAA–βCD shows good potential of a new monomer in molecularly imprinted polymer preparation and can be used as an effective adsorbent for the removal of BPA from aqueous solutions.
中文翻译:
使用杂化环糊精与磁性分子印迹聚合物的高选择性吸附剂去除水介质中的双酚A
在这项研究中,使用β-环糊精(β-CD)作为共聚单体与甲基丙烯酸(MAA)通过本体聚合开发了一种独特的磁性分子印迹聚合物(MMIP)吸附剂,以双酚A(BPA)为模板分子,形成MMIP MAA-βCD作为新型吸附剂。β-CD 与 MAA 杂交以获得水相容性印迹位点,从而有效去除水样中的 BPA。过氧化苯甲酰和三羟甲基丙烷三甲基丙烯酸酯分别用作引发剂和交联剂。通过傅里叶变换红外光谱、扫描电子显微镜、透射电子显微镜、振动样品磁力计、Brunauer-Emmett-Teller 和 X 射线衍射对吸附剂进行了表征。1 H核磁共振波谱用于表征MAA-βCD和BPA-MAA-βCD复合物。对影响 BPA 吸附效率的几个参数(如吸附剂用量、样品溶液 pH 值、接触时间、初始浓度和温度)以及选择性和可重复使用性研究进行了评估。与 MMIP MAA 相比,MMIP MAA-βCD 由于其存在 β-CD 的独特形态而表现出明显更高的去除效率和对 BPA 的选择性结合能力。动力学数据可以通过伪二级动力学和最适合等温线数据的Freundlich等温线和Halsey模型来很好地描述。热力学研究表明吸附反应是一个自发的放热过程。因此,基于MAA-βCD杂化单体的MMIP在分子印迹聚合物制备中显示出新型单体的良好潜力,可用作去除水溶液中BPA的有效吸附剂。