作者：曹世权^1,2, 王远曦², 郑常义², 戴学志^1,2, 田强¹, 晏敏皓^1,2,3

作者单位：1. 西南科技大学 环境友好能源材料国家重点实验室，四川 绵阳 621010;
2. 西南科技大学材料科学与工程学院，四川 绵阳 621010;
3. 四川长晏科技有限公司，四川 绵阳，621000

关键词：γ-Fe₂O₃超顺磁纳米颗粒;壳聚糖;胶体;吸附性能

摘要：

超顺磁纳米材料因其具有较好的吸附性能、良好的生物相容性和易固液分离等优点而在重金属的去除研究中备受关注。将壳聚糖与由共沉淀法制备的γ-Fe₂O₃超顺磁纳米颗粒复合制备γ-Fe₂O₃超顺磁纳米颗粒/壳聚糖复合胶体体系，利用动态光散射与小角X射线散射技术对胶体粒径及结构进行原位表征，并考察该胶体体系对Pb(Ⅱ)的吸附性能。结果表明：γ-Fe₂O₃超顺磁纳米颗粒多分散系数较小，与壳聚糖复合后呈软团聚的胶体结构；该胶体体系对Pb(Ⅱ)的吸附动力学符合准二级吸附动力学模型，动力学拟合最大吸附容量为42.9 mg/g，说明该胶体体系对Pb(Ⅱ)具有优异的吸附性能且以化学吸附为主。该胶体体系可为Pb(II)污染的水体治理提供实验和技术参考。

Preparation, characterization and absorption performance to Pb(Ⅱ) of γ-Fe₂O₃ superparamagnetic nanoparticles/chitosan composite colloidal system
CAO Shiquan^1,2, WANG Yuanxi², ZHENG Changyi², DAI Xuezhi^1,2, TIAN Qiang¹, YAN Minhao^1,2,3
1. State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China;
2. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China;
3. Sichuan Changyan Science and Technology Co., Ltd., Mianyang 621000, China
Abstract: Superparamagnetic nanomaterials have attracted increased attention in the field of heavy metal removal due to their good adsorption performance, biocompatibility, and solid-liquid separable. γ-Fe₂O₃ superparamagnetic nanoparticles/chitosan composite colloidal system was prepared by combining chitosan with γ-Fe₂O₃ superparamagnetic nanoparticles as obtained by co-precipitation. The particle size and structure of the colloid system were characterized in situ by dynamic light scattering and small-angle X-ray scattering techniques, and the adsorption performance of the colloid system to Pb(Ⅱ) was further investigated. The results shown that the γ-Fe₂O₃ superparamagnetic nanoparticles were in a low polydispersity coefficient station and a soft-agglomerated colloid system before and after combining with chitosan, respectively. The adsorption kinetics of the colloid system to Pb(Ⅱ) was in agreement well with the quasi-two-stage adsorption kinetic model, and the fitted maximum adsorption capacity was 42.9 mg/g, indicating that the colloidal system has excellent adsorption performance for Pb(Ⅱ) and is mainly chemical adsorption. The colloid system provided an experimental and technical reference for the treatment of Pb(Ⅱ) polluted water bodies.
Keywords: γ-Fe₂O₃ superparamagnetic nanoparticles;chitosan;colloid;absorption performance
2022, 48(1):160-167  收稿日期: 2021-02-09;收到修改稿日期: 2021-03-27
基金项目: 国家自然科学基金大科学装置联合基金项目(U1932117)；环境友好能源材料国家重点实验室自主课题(20fksy07)
作者简介: 曹世权（1994-），男，重庆市人，硕士研究生，专业方向为超顺磁性纳米材料研究
参考文献
[1] 吴为, 武攀峰, 缪明, 等. 滨江沿海地区耕地土壤重金属污染特征及潜在生态风险[J]. 中国测试, 2019, 45(2): 78-82,110
[2] VOJOUDI V, BADIEI A, BAHAR S, et al. A new nano-sorbent for fast and efficient removal of heavy metals from aqueous solutions based on modification of magnetic mesoporous silica nanospheres[J]. Journal of Magnetism and Magnetic Materials, 2017, 441: 193-203
[3] 陈鹏飞, 宋航, 李福林, 等. 丁烯二酸单酯化-β-环糊精修饰的磁性纳米颗粒制备及性能研究[J]. 中国测试, 2017, 43(4): 38-43
[4] SETSHEDI K Z, BHAUMIK M, ONYANGO M S, et al. High-performance towards Cr(VI) removal using multi-active sites of polypyrrole-graphene oxide nanocomposites: batch and column studies[J]. Chemical Engineering Journal, 2015, 262: 921-931
[5] 许淑霞, 杨超, 陈强. 金属有机骨架材料吸附去除水体中重金属研究进展[J]. 中国测试, 2018, 44(11): 12-18
[6] LOU T, YAN X, WANG X J. Chitosan coated polyacrylonitrile nanofibrous mat for dye adsorption[J]. International Journal of Biological Macromolecules, 2019, 135: 919-925
[7] ALAM O, QIAO X C, NATH T K. The effect of Ca-bearing contents in chitosan on Pb²⁺, Cd²⁺ and Cu²⁺ adsorption and its adsorption mechanism[J]. Journal of Environmental Science and Health, 2020, 18: 1401-1414
[8] PANG X N, BOUZID M, SANTOS J M N D, et al. Theoretical study of indigotine blue dye adsorption on CoFe₂O₄/chitosan magnetic composite via analytical model[J]. Colloids and Surfaces A:Physicochemical and Engineering Aspects, 2020, 589: 124467
[9] 丁思远, 王雪, 汪茂, 等. 小角X射线散射测量高分子薄膜亚纳米孔径[J]. 核技术, 2018, 41(12): 12-18
[10] FILIPPOV S K, PAPAGIANNOPOULOS A, RIABTSEVA A, et al. Adsorption of lysozyme on pH-responsive PnBA-b-PAA polymeric nanoparticles: Studies by stopped-flow SAXS and ITC[J]. Colloid and Polymer Science, 2018, 296(7): 1183-1191
[11] LIU Z L, LIU Y J, YAO K L, et al. Synthesis and magnetic properties of Fe₃O₄ nanoparticles[J]. Journal of Materials Processing Technology, 2002, 10: 83-87
[12] 庄文昌, 陈晓, 赵继宽, 等. 胶体分散体系与有序分子组合体的小角X射线散射研究[J]. 化学进展, 2005, 5: 881-888
[13] 李志宏, 巩雁军, 蒲敏, 等. SAXS测定二氧化硅胶体粒子结构[J]. 无机化学学报, 2003, 3: 252-256
[14] LINDNER P, ZEMB T. Neutron, X-ray and light: Scattering methods applied to soft condensed matter[M]. Amsterdam: Elsevier, 2002: 23-71.
[15] PLAZINKI W, RUDZINSKI W, PLAZINSKA A. Theoretical models of sorption kinetics including a surface reaction mechanism: a review[J]. Advances in Colloid and Interface Science, 2009, 152(1-2): 2-13