School of Chemical Engineering and Technology, North University of China, Taiyuan 030051, China.
School of Chemical Engineering and Technology, North University of China, Taiyuan 030051, China.
Int J Biol Macromol. 2020 Nov 15;163:2334-2345. doi: 10.1016/j.ijbiomac.2020.09.078. Epub 2020 Sep 14.
Dyes bring a lot of benefits to our lives, however, as common organic pollutants, they have destructive influences on the environment. Firstly, glutaraldehyde crosslinked chitosan microspheres (GCS) are prepared via inverse-phase suspension polymerization. Then, GCS microspheres are acted as the base material, ammonium persulfate (Aps) as the initiator, sodium styrene sulfonate (SSS) as anionic functional monomer, functional microspheres (GCS-g-PSSS) are prepared by surface grafting polymerization. The amount of monomer and Aps, temperature and reaction time is respectively explored. The chemical structures and physicochemical properties of functional microspheres were characterized by FT-IR, zeta potential, scanning electron microscope and X-ray photoelectron spectroscopy. The adsorption kinetic at different temperature and initial concentration is studied and fitted. The adsorption isotherms of GCS-g-PSSS for MB are explored at different pH, temperature and salinity. The adsorption capacity of GCS-g-PSSS for MB is 820.1 mg/g at 318 K. The adsorption isotherms at different temperature are fitted by Langmuir, Freundlich, Dubinin-Radushkevich and Temkin. Thermodynamic parameters imply that adsorption is a spontaneous and endothermic process. And this adsorbent has good reusability. The adsorption ability of GCS-g-PSSS microspheres is also excellent for other cationic dyes. Thus, GCS-g-PSSS microspheres might serve as a promising adsorbent for contaminated water scavenging.
染料给我们的生活带来了很多好处，然而，作为常见的有机污染物，它们对环境具有破坏性的影响。首先，通过反相悬浮聚合制备戊二醛交联壳聚糖微球（GCS）。然后，以 GCS 微球为基体，过硫酸铵（Aps）为引发剂，苯乙烯磺酸钠（SSS）为阴离子功能单体，通过表面接枝聚合制备功能微球（GCS-g-PSSS）。分别探讨了单体和 Aps 的用量、温度和反应时间。通过傅里叶变换红外光谱（FT-IR）、Zeta 电位、扫描电子显微镜（SEM）和 X 射线光电子能谱（XPS）对功能微球的化学结构和物理化学性质进行了表征。研究并拟合了不同温度和初始浓度下的吸附动力学。在不同 pH、温度和盐度下，研究了 GCS-g-PSSS 对 MB 的吸附等温线。在 318 K 时，GCS-g-PSSS 对 MB 的吸附容量为 820.1 mg/g。通过 Langmuir、Freundlich、Dubinin-Radushkevich 和 Temkin 对不同温度下的吸附等温线进行了拟合。热力学参数表明，吸附是一个自发和吸热的过程。并且这种吸附剂具有良好的可重复使用性。GCS-g-PSSS 微球对其他阳离子染料也具有优异的吸附能力。因此，GCS-g-PSSS 微球可能是一种很有前途的用于处理受污染水的吸附剂。
