School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, PR China.
School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, PR China; Research Center of Analysis and Test, East China University of Science and Technology, Shanghai 200237, PR China.
Int J Biol Macromol. 2019 May 1;128:593-602. doi: 10.1016/j.ijbiomac.2019.01.189. Epub 2019 Jan 30.
In this present study, spherical magnetic calcium modified chitosan micro-particles (MG-Ca-CMPs) were synthesized by using embedding/cross-linking method and employed as an efficient adsorbent for Orange II (OII) in single system and coexisted with methylene blue (MB) in binary system. The obtained MG-Ca-CMPs were characterized by fourier transform infrared spectrometer, transmission electron microscopy, scanning electron microscope, X-ray diffraction and magnetic property measurement system analyses, which demonstrated that the MG-Ca-CMPs possessed core-shell structure and excellent superparamagnetic property. The adsorption behaviors for OII in single system and coexisted with MB in binary system were systematically studied. Adsorption experiments data showed that MG-Ca-CMPs presented an excellent high affinity to acid dye OII (q = 962 mg·g) in single system, which followed the Langmuir isotherm model and pseudo-second order kinetics model. Interestingly, MB, hardly adsorbed in acidic solution, had effective adsorption performance (increased from 20 mg·g to 350 mg·g) in binary system by MG-Ca-CMPs. This result was attributed to the synergistic effect caused by the positive and negative charge attraction between OII and MB, forming the positive-negative-positive adsorption mechanism. It is believed that MG-Ca-CMPs could be used as a potential adsorbent for the adsorption and separation of coexisting anionic-cationic dyes from dye wastewater.
在本研究中，通过包埋/交联法合成了球形磁性钙修饰壳聚糖微球（MG-Ca-CMPs），并将其用作单体系中橙色 II（OII）和共存于二元体系中亚甲蓝（MB）的有效吸附剂。通过傅里叶变换红外光谱仪、透射电子显微镜、扫描电子显微镜、X 射线衍射仪和磁性能测量系统分析对获得的 MG-Ca-CMPs 进行了表征，结果表明，MG-Ca-CMPs 具有核壳结构和优异的超顺磁性。系统研究了单体系中 OII 和共存于二元体系中 MB 的吸附行为。吸附实验数据表明，MG-Ca-CMPs 在单体系中对酸性染料 OII（q=962mg·g）具有优异的高亲和力，遵循 Langmuir 等温吸附模型和拟二级动力学模型。有趣的是，MB 在酸性溶液中几乎不被吸附，但在 MG-Ca-CMPs 的存在下，在二元体系中具有有效的吸附性能（从 20mg·g 增加到 350mg·g）。这一结果归因于 OII 和 MB 之间的正电荷和负电荷吸引所产生的协同效应，形成了正-负-正吸附机制。可以相信，MG-Ca-CMPs 可用作从染料废水中吸附和分离共存的阴离子-阳离子染料的潜在吸附剂。
