Shafqat Syed Rizwan, Bhawani Showkat Ahmad, Bakhtiar Salma, Ibrahim Mohamad Nasir Mohamad, Shafqat Syed Salman
Faculty of Resource Science and Technology, Universiti Malaysia Sarawak (UNIMAS), 94300, Kota Samarahan, Sarawak, Malaysia.
Department of Chemistry, University of Sialkot, Sialkot, 51040, Pakistan.
BMC Chem. 2023 May 11;17(1):46. doi: 10.1186/s13065-023-00957-8.
This study entails the synthesis of molecularly imprinted polymers (MIPs) with good selectivity coefficients for azo dye as a potential sorbent material to extract azo dye from polluted aqueous media. A series of MIPs for methyl red (MR) as a template, were synthesized by changing the molar ratio of functional monomers, via precipitation polymerization format of non-covalent approach. Water-soluble functional monomer; acrylic acid (AA) was used to weave the frame work of polymers while ethylene glycol dimethacrylate (EGDMA) was utilized as crosslinking monomer. The impact of different experimental parameters, such as mole ratio of monomer (functional) to crosslinking monomer on the molecular recognition was investigated. The highly efficient and selective MR-MIP was used for the removal of spiked MR dye from different water samples. The selected imprinted polymer, MR1-MIP was able to selectively remove the MR molecules from aqueous media. A significant amount of dye was removed by MR1-MIP from the river water samples with a high degree of removal efficiency i.e. 92.25%. The imprinting factor of 3.75 for MR1-MIP indicated that the high selectivity in terms of adsorption for MR. A minimum loss of only ~ 3.35% in the removal efficiency within ten sequential cycles of adsorption-desorption study evidenced that MR-MIPs could be used as the most cost effective and best sorbent for the removal of MR from polluted water. Furthermore, the structural properties of MR-MIPs were characterized by FTIR and EDX, whereas TGA, SEM and BET were used to describe the thermal, morphological and surface structures of the particles, respectively.
本研究涉及合成对偶氮染料具有良好选择性系数的分子印迹聚合物（MIPs），作为一种潜在的吸附材料，用于从污染的水介质中提取偶氮染料。通过改变功能单体的摩尔比，采用非共价方法的沉淀聚合法，合成了一系列以甲基红（MR）为模板的MIPs。水溶性功能单体丙烯酸（AA）用于构建聚合物骨架，而乙二醇二甲基丙烯酸酯（EGDMA）用作交联单体。研究了不同实验参数，如单体（功能）与交联单体的摩尔比对分子识别的影响。高效且选择性的MR-MIP用于从不同水样中去除加标的MR染料。所选的印迹聚合物MR1-MIP能够从水介质中选择性地去除MR分子。MR1-MIP从河水样中去除了大量染料，去除效率高达92.25%。MR1-MIP的印迹因子为3.75，表明其对MR具有高吸附选择性。在十个连续的吸附-解吸研究循环中，去除效率仅最低损失约3.35%，这证明MR-MIPs可作为从污染水中去除MR最具成本效益和最佳的吸附剂。此外，通过FTIR和EDX对MR-MIPs的结构性质进行了表征，而TGA、SEM和BET分别用于描述颗粒的热、形态和表面结构。
