文献类型：期刊文献

英文题名：Synthesis of spherical magnetic calcium modified chitosan micro-particles with excellent adsorption performance for anionic-cationic dyes

作者：He, Changquan[1];Shi, Lei[1];Lou, Sichao[1];Liu, Bao[1];Zhang, Wenqing[1];Zhang, Lingfan[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Res Ctr Anal & Test, Shanghai 200237, Peoples R China

年份：2019

卷号：128

起止页码：593

外文期刊名：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES

收录：;EI(收录号：20242616418015);WOS:【SCI-EXPANDED(收录号:WOS:000463305100069)】；

基金：We are grateful for the financial support by National Natural Science Foundation of China (Grant No. 21407050).

语种：英文

外文关键词：Magnetic calcium-chitosan micro-particles; Anionic-cationic dyes; Positive-negative-positive model

摘要：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 (011) 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 011 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 011 (q(max) = 962 mg.g(-1)) 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(-1), to 350 mg.g(-1)) in binary system by MG-Ca-CMPs. This result was attributed to the synergistic effect caused by the positive and negative charge attraction between 011 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. (C) 2019 Elsevier B.V. All rights reserved.