| 新型磁性螯合纳米材料对水中Cd2+的吸附性能 |
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| 引用本文： | 郭晓婧,张志毅,郭掌珍.新型磁性螯合纳米材料对水中Cd2+的吸附性能[J].核农学报,2021,35(7):1707-1716. |
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| 作者姓名： | 郭晓婧 张志毅 郭掌珍 |
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| 作者单位： | 山西农业大学资源与环境学院,山西太谷030801 |
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| 基金项目： | 土壤环境与养分资源山西省重点实验开放基金项目(2017003),山西省自然科学基金项目(2015011082) |
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| 摘 要： | 为探索高效且快速去除水溶液中Cd2+的方法,以二乙基二硫代氨基甲酸钠(DDTC)为改性剂,制得一种新型磁性螯合纳米材料(Fe3O4@SiO2-DDTC)。通过X射线衍射(XRD)、扫描电镜(SEM)和傅里叶红外(FT-IR)等手段进行表征分析,并设计批量吸附试验。结果表明,Fe3O4@SiO2-DDTC粒径为115~125 nm,饱和磁化强度为25.74 emu·g-1。经DDTC改性后,Fe3O4@SiO2-DDTC对Cd2+的吸附能力得到有效提升,且在pH值4~8较宽范围内,可实现对Cd2+的有效吸附。由于Cd2+的吸附位位于Fe3O4@SiO2-DDTC的最外层,Cd2+的吸附脱附均较快,5 min内可达到吸附平衡量的82%,2 h后达到吸附平衡,符合准二级动力学模型。吸附等温线更符合Langmuir模型,在45℃条件下,Fe3O4@SiO2-DDTC对Cd2+的理论最大吸附量为45.52 mg·g-1。材料对Cd2+吸附是以单分子层化学吸附为主,并伴有物理吸附过程。材料的重复使用性能试验显示,经4次循环使用后, Fe3O4@SiO2-DDTC对Cd2+仍具有良好的吸附效果,表明其良好的重用性。本研究结果为磁性纳米材料在Cd废水处理方面的应用提供了理论依据。
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| 关 键 词： | 纳米四氧化三铁 二乙基二硫代氨基甲酸钠 吸附 镉 |
| 收稿时间： | 2020-10-27 |
Adsorption Properties of Novel Magnetic Chelate Nanomaterials to Cd2+ From Aqueous Solutions |
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| GUO Xiaojing,ZHANG Zhiyi,GUO Zhangzhen.Adsorption Properties of Novel Magnetic Chelate Nanomaterials to Cd2+ From Aqueous Solutions[J].Acta Agriculturae Nucleatae Sinica,2021,35(7):1707-1716. |
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| Authors: | GUO Xiaojing ZHANG Zhiyi GUO Zhangzhen |
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| Institution: | College of Resources and Environment, Shanxi Agricultural University, Taigu, Shanxi 030801 |
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| Abstract: | To explore an efficient and rapid method for Cd2+ removal from aqueous solutions, a novel magnetic core-shell structure nanomaterials (Fe3O4@SiO2-DDTC) was synthesized and modified with sodium diethyldithiocarbamate (DDTC). Fe3O4@SiO2-DDTC composites was characterized using X-ray diffraction (XRD), scanning electron microscope (SEM) and Fourier transform infrared spectrometry (FT-IR). To investigate the adsorption properties of materials, batch adsorption experiments were designed. The results showed that the particle size of Fe3O4@SiO2-DDTC was 115~125 nm, and the saturation magnetization was 25.74 emu·g-1. The adsorption ability of the material was significantly improved with DDTC modifying, and effective adsorption was achieved in a wide range of pH range of 4~8. As the adsorption site of Cd2+ was located in the outermost layer of Fe3O4@SiO2-DDTC, the adsorption and desorption of Cd2+ were relatively fast, exceeding 80% of the adsorption equilibrium within 5 min, and reaching the adsorption equilibrium after 2 hours. The whole adsorption process conformed to the pseudo-second-order model. The adsorption isotherm was more consistent with the Langmiur model, with a maximum adsorption capacity of 45.52 mg·g-1(45℃). The results of adsorption mechanism analysis showed that the adsorption process of Fe3O4@SiO2-DDTC for Cd2+ removal was dominated by chemical adsorption, while accompanied by physical adsorption. After desorption and regeneration for 4 cycles with thiourea-nitric acid solution, Fe3O4@SiO2-DDTC still had a good adsorption effect on Cd2+. Recycle tests showed that the material still had significant Cd2+ removal capability for four successive adsorption-desorption cycles, indicating that Fe3O4@SiO2-DDTC had high reusability. The results of this study can provide a theoretical basis for the application of magnetic nanomaterials in cadmium wastewater treatment. |
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| Keywords: | nano-Fe3O4 sodium diethyldithiocarbamate adsorption cadmium |
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