School of Chemical Engineering and Technology, North University of China, Taiyuan 030051, PR China.
School of Chemical Engineering and Technology, North University of China, Taiyuan 030051, PR China.
Int J Biol Macromol. 2021 Jun 30;181:810-823. doi: 10.1016/j.ijbiomac.2021.04.079. Epub 2021 Apr 15.
A novel adsorbent with high adsorption capacity to remove cationic dyes was synthesized. Sodium 4-styrene sulfonate (SSS) was grafted polymerization on the surface of magnetic chitosan microspheres via -NH/SO surface initiating system, obtaining MCS-g-PSSS microspheres. The grafted microsphere was characterized by Fourier transforms infrared spectroscopy, X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, vibration sample magnetometer and the Brunauer-Emmett-Teller. Cationic dyes were adsorbed by MCS-g-PSSS and methylene blue(MB) was acted as a typical example. The adsorption performance was explored by varying experimental conditions. The results showed the maximal adsorption capacity was 989 mg/g at pH 1 at 25 °C. The pseudo-second order model was found to be applicable for the adsorption kinetics. The adsorption capacity increased with rising temperature and it decreased owing to adding of ions. The adsorption isotherms were the best fitted by Langmuir. MCS-g-PSSS for MB showed high adsorption capacity due to the strong electrostatic interactions and π-π stacking, which was explained by FTIR and XPS and was verified by DFT calculations. The degree of adsorption spontaneity increased with rising the temperature. The grafted MCS-g-PSSS microspheres had high adsorption capacity for various kinds of cationic dyes and excellent for remove MB in the aqueous solution.
一种新型吸附剂，具有高吸附容量，可去除阳离子染料。通过-NH/ SO 表面引发体系，将 4- 乙烯基苯磺酸钠（SSS）接枝聚合到磁性壳聚糖微球表面，得到 MCS-g-PSSS 微球。通过傅里叶变换红外光谱、X 射线衍射、扫描电子显微镜、X 射线光电子能谱、振动样品磁强计和 Brunauer-Emmett-Teller 对接枝微球进行了表征。通过 MCS-g-PSSS 吸附阳离子染料，以亚甲基蓝（MB）为典型实例，探讨了不同实验条件下的吸附性能。结果表明，在 25°C、pH 值为 1 时，最大吸附容量为 989mg/g。吸附动力学符合拟二级动力学模型。吸附容量随温度升高而增加，随离子加入而降低。吸附等温线最符合朗缪尔模型。MCS-g-PSSS 对 MB 具有高吸附容量，这是由于强静电相互作用和 π-π 堆积，这通过 FTIR 和 XPS 得到了解释，并通过 DFT 计算得到了验证。吸附自发性随温度升高而增加。接枝 MCS-g-PSSS 微球对各种阳离子染料具有高吸附容量，在水溶液中对 MB 具有良好的去除效果。
