Suručić Ljiljana, Janjić Goran, Marković Bojana, Tadić Tamara, Vuković Zorica, Nastasović Aleksandra, Onjia Antonije
Faculty of Medicine, University of Banja Luka, Save Mrkalja 14, 78000 Banja Luka, Bosnia and Herzegovina.
Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia.
Materials (Basel). 2023 Mar 10;16(6):2233. doi: 10.3390/ma16062233.
A new magnetic amino-functionalized polymeric sorbent based on glycidyl methacrylate was synthesized and used in the separation of chromium Cr(VI) oxyanions sorption from aqueous solutions in a static batch system. The kinetic and isothermal parameters of the sorption process were determined. The experimental data were best fitted by a pseudo-second-order model with = 0.994 and = 0.004. The sorption process of Cr(VI) removal by amino-functionalized sorbent was controlled by both intraparticle diffusion and liquid film diffusion. The equilibrium results showed that the sorption process is best described by the Freundlich model, followed closely by the Sips isotherm model, with a maximum sorption capacity of 64 mg/g. Quantum chemical modeling revealed that the sorption sites on the sorbent surface are fragments with diethylenetriamine and aminopropyl silane groups that coated the magnetic nanoparticles. The calculations showed that Cr(VI) oxyanions (CrO, CrO and HCrO) bind to both sorption sites, with diethylenetriamine centers slightly favored. The X-ray photoelectron spectroscopy (XPS) spectra demonstrate that the chromium bound to the sorbent in the form of Cr(III), indicating that the Cr(VI) can be converted on the surface of the sorbent to a less harmful form Cr(III) due to the sorbent's chemical composition.
合成了一种基于甲基丙烯酸缩水甘油酯的新型磁性氨基功能化聚合物吸附剂，并将其用于在静态间歇系统中从水溶液中分离铬（Cr(VI)）含氧阴离子的吸附过程。测定了吸附过程的动力学和等温参数。实验数据最适合用伪二级模型拟合，其中(R^2 = 0.994)，(k_2 = 0.004)。氨基功能化吸附剂去除Cr(VI)的吸附过程受颗粒内扩散和液膜扩散共同控制。平衡结果表明，吸附过程用Freundlich模型描述最佳，其次是Sips等温线模型，最大吸附容量为64 mg/g。量子化学建模表明，吸附剂表面的吸附位点是包覆磁性纳米颗粒的二乙烯三胺和氨丙基硅烷基团片段。计算表明，Cr(VI)含氧阴离子（(CrO_4^{2 - })、(Cr_2O_7^{2 - })和(HCrO_4^ - )）与两个吸附位点结合，二乙烯三胺中心稍占优势。X射线光电子能谱（XPS）光谱表明，铬以Cr(III)的形式与吸附剂结合，这表明由于吸附剂的化学成分，Cr(VI)在吸附剂表面可转化为危害较小的Cr(III)形式。
