王君,周怡伶,陈勇,吴波.Fe3O4@SiO2-Chitosan的制备及其对水中Cu2+的吸附效能研究[J].环境科学学报,2019,39(8):2567-2574
Fe3O4@SiO2-Chitosan的制备及其对水中Cu2+的吸附效能研究
- Preparation of Fe3O4@SiO2-Chitosan and its adsorption properties for copper ions in water
- 基金项目：南京工业大学浦江学院校级重点课题（No.njpj2017-1-03）；华中科技大学自主创新研究基金（No.01-18-261027）
- 王君
- 南京工业大学浦江学院土木与建筑工程学院, 南京 211200
- 周怡伶
- 华东勘测设计研究院有限公司, 杭州 311122
- 吴波
- 长江勘测规划设计研究有限责任公司, 武汉 430010
- 摘要：以SiO2包覆Fe3O4，戊二醛为交联剂，交联壳聚糖（Chitosan，CTS），制得Fe3O4@SiO2-Chitosan复合磁性纳米粒子.以Fe3O4和Fe3O4@SiO2为对照，采用X射线衍射、透射电镜和傅立叶红外光谱对其进行表征分析，并测定了投加量、pH值、吸附时间和温度等因素对Cu2+吸附效果的影响，从动力学、热力学以及再生回用性能评价等方面对其吸附性能进行了探究.结果表明Fe3O4@SiO2-Chitosan对Cu2+的吸附过程符合准二级吸附动力学模型和Langmuir模型，为自发、放热、优惠型的单分子层化学吸附.在pH为6.0，298 K下达到最大吸附量154.8 mg·g-1，吸附解吸4次后吸附容量变化不大，说明Fe3O4@SiO2-Chitosan具有较高的吸附容量，可作为处理含铜废水和回收铜的高效吸附剂.
- Abstract：Fe3O4@SiO2-Chitosan magnetic nanoparticle compounds were prepared by coating both of Fe3O4 with SiO2 and Chitosan (CTS) crosslinked with glutaraldehyde (GTA). Compared with Fe3O4, Fe3O4@SiO2, Fe3O4@SiO2-Chitosan was characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR) and the effect of adsorbent dose, solution pH, adsorption time and temperature on Cu2+adsorption were investigated. Besides, the adsorption properties of Fe3O4@SiO2- Chitosan were implemented from three aspects:adsorption kinetics, thermodynamics and reusability evaluation. The results show that pseudo-second-order kinetics model and Langmuir isotherm model are more suitable for describing the adsorption of Cu2+on Fe3O4@SiO2- Chitosan, suggesting that the adsorption process is a spontaneous, exothermic and preferential monolayer chemisorption. At pH 6.0 and 298 K,the maximum adsorption capacity of Cu2+ is reported at 154.80 mg·g-1. After desorption and regeneration for more than four cycles, the adsorption capacity has been maintained the same and there is no significant change. This can be inferred that Fe3O4@SiO2-Chitosan can be used as a high-efficiency adsorbent for the removal and recycle of copper from copper-containing wastewater.
