铁酸锰/腐植酸复合材料制备及其对亚甲基蓝吸附性能

doi:10.11944/j.issn.1000-0518.2016.03.150257

摘要/Abstract

摘要：

采用化学共沉淀法合成了一种腐植酸(Humic Acid,HA)包覆铁酸锰型磁性复合材料(MnFe₂O₄/HA)。采用扫描电子显微镜(SEM)、粉末X射线衍射(XRD)和傅里叶变换红外光谱(FT-IR)等技术手段对其进行表征和分析表明,合成产物颗粒大小约200 nm,具有典型的尖晶石结构,腐植酸成功包覆在MnFe₂O₄颗粒表面,饱和磁化强度为34.01 A·m²/kg,在外界低磁场作用下30 s内便可从水溶液分离。 MnFe₂O₄/HA对亚甲基蓝的吸附是一个准二级动力学过程,在2 h达到平衡,较好的符合Langmuir吸附模型。与MnFe₂O₄相比其对亚甲基蓝的吸附能力显著增强,室温下pH=9时最大吸附量可以达到29.94 mg/g。 MnFe₂O₄/HA可以作为一种有效去除水体中亚甲基蓝污染物的吸附材料。

关键词: 铁酸锰, 腐植酸, 亚甲基蓝, 选择性吸附, 脱附再生

Abstract:

Humic acid(HA)-coated manganese ferrite(MnFe₂O₄/HA) magnetic composite materials were prepared with chemical coprecipitation method and its nanoparticles were characterzied by X-ray diffraction(XRD), scanning electron microscopy(SEM) and Fourier transform infrared(FT-IR) analysis. The results show that the size of the product is about 200 nm. MnFe₂O₄/HA has a typical spinel structure and is successfully coated with humic acid on its surface. The saturation magnetization of MnFe₂O₄/HA is 34.01 A·m²/kg. MnFe₂O₄/HA can be separated from water with low magnetic field within 30 seconds. The adsorption of methylene blue is a pseudo second-rate kinetic process and reaches equilibrium in about 2 h, in good agreement with the Langmuir adsorption model. MnFe₂O₄/HA has higher adsorption ability than that of pure MnFe₂O₄. The max adsorbing capacity can reach 29.94 mg/g at room temperature and pH=9. MnFe₂O₄/HA can be used as adsorption material for effective removal of methylene blue from waste water.

Key words: manganese ferrite, humic acid, methylene blue, selective adsorption, regeneration

靳廷甲, 章祥林, 徐建. 铁酸锰/腐植酸复合材料制备及其对亚甲基蓝吸附性能[J]. 应用化学, 2016, 33(3): 336-342.

JIN Tingjia, ZHANG Xianglin, XU Jian. Preparation of Manganese Ferrite/Humic Acid Composite and Its Adsorption Properties for Methylene Blue[J]. Chinese Journal of Applied Chemistry, 2016, 33(3): 336-342.

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