Adeyi Abel Adekanmi, Jamil Siti Nurul Ain Md, Abdullah Luqman Chuah, Choong Thomas Shean Yaw, Lau Kia Li, Abdullah Mohammad
Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, UPM Serdang 43400, Malaysia.
Department of Chemical and Petroleum Engineering, College of Engineering, Afe Babalola University Ado-Ekiti, ABUAD, KM. 8.5, Afe Babalola Way, P.M.B. 5454, Ado-Ekiti, Ekiti State, Nigeria.
Materials (Basel). 2019 May 28;12(11):1734. doi: 10.3390/ma12111734.
The paper evaluates the adsorptive potential of thiourea-modified poly(acrylonitrile--acrylic acid), (TA-poly(AN--AA)) for the uptake of cationic methylene blue (MB) from aquatic environments a batch system. TA-poly(AN--AA) polymer was synthesized through redox polymerization and modified with thiourea (TA) where thioamide groups were introduced to the surface. Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), CHNS and Zetasizer were used to characterize the physico-chemical and morphological properties of prepared TA-poly(AN--AA). Afterwards, it was confirmed that incorporation of thioamide groups was successful. The adsorption kinetics and equilibrium adsorption data were best described, respectively, by a pseudo-second-order model and Freundlich model. Thermodynamic analysis showed the exothermic and spontaneous nature of MB uptake by TA-poly(AN--AA). The developed TA-poly(AN--AA) polymer demonstrated efficient separation of MB dye from the aqueous solution and maintained maximum adsorption capacity after five regeneration cycles. The findings of this study suggested that synthesized TA-poly(AN--AA) can be applied successfully to remove cationic dyes from aquatic environments.
本文评估了硫脲改性的聚（丙烯腈-丙烯酸）（TA-聚（AN-AA））在间歇系统中从水环境中吸附阳离子亚甲基蓝（MB）的潜力。TA-聚（AN-AA）聚合物通过氧化还原聚合合成并用硫脲（TA）改性，从而将硫酰胺基团引入表面。采用傅里叶变换红外（FT-IR）光谱、扫描电子显微镜（SEM）、CHNS和Zetasizer对制备的TA-聚（AN-AA）的物理化学和形态学性质进行表征。之后，证实硫酰胺基团的引入是成功的。吸附动力学和平衡吸附数据分别用伪二级模型和Freundlich模型进行了最佳描述。热力学分析表明TA-聚（AN-AA）对MB的吸附具有放热和自发的性质。所制备的TA-聚（AN-AA）聚合物能够有效地从水溶液中分离MB染料，并且在五个再生循环后仍保持最大吸附容量。本研究结果表明，合成的TA-聚（AN-AA）可成功应用于从水环境中去除阳离子染料。
