(1. 東北師范大學(xué) 環(huán)境學(xué)院，長春 130117；
2. 長春工程學(xué)院 水利與環(huán)境工程學(xué)院，長春 130012；
3. 吉林省林業(yè)勘察設(shè)計(jì)研究院，長春 130022)
摘 要: 以地下水廠含鐵污泥為原料，利用一步溶劑熱法制備出含有Fe3O4的磁性材料。采用磁學(xué)性質(zhì)測量系統(tǒng)、X射線衍射儀、穆斯堡爾譜儀、X射線光電子能譜儀和掃描電鏡對(duì)鐵泥和磁性材料進(jìn)行表征。結(jié)果表明：地下水廠鐵泥含鐵量較低(16.6%，質(zhì)量分?jǐn)?shù))，其雜質(zhì)主要是硅和鋁礦物，粒徑約為70 nm，在磁場下不會(huì)遷移；經(jīng)過溶劑熱法處理后，生成含有Fe3O4的橢球形磁性材料，粒徑達(dá)到1.5 μm，比飽和磁化強(qiáng)度(Ms)可達(dá)18.9 A？m2/kg，在磁場下可迅速向磁極遷移并聚集，體現(xiàn)了良好的磁響應(yīng)特征。磁性材料對(duì)水中亞甲基藍(lán)的吸附效果接近粉末活性炭，在5 min內(nèi)對(duì)10 mg/L亞甲基藍(lán)的吸附效率達(dá)到92.3%。本研究方法可以處理含鐵量較低的鐵泥，實(shí)現(xiàn)鐵泥的資源化利用，制備的磁性材料在染料廢水處理中具有潛在的應(yīng)用價(jià)值。
關(guān)鍵字: 四氧化三鐵；亞甲基藍(lán)；地下水廠；鐵泥；溶劑熱法
（1. School of Environment, Northeast Normal University, Changchun 130117, China;
2. College of Water Conservancy and Environmental Engineering,
Changchun Institute of Technology, Changchun 130012, China;
3. Jilin Institute of Forestry Survey and Design, Changchun 130022, China）
Abstract:Magnetic material with ferroferric oxide was synthesized by one-step solvothermal method using iron mud with low-iron-content as the raw material. The obtained magnetic material was characterized by magnetic property measurement system (MPMS), X-ray diffraction (XRD), M？ssbauer spectroscopy, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The results show that the iron content in iron mud is only 16.6% (mass fraction), while the main impurities are silicon and aluminum oxides, iron mud with the average size of 70 nm does not have any magnetism. After solvothermal process, the obtained magnetic material contains ferroferric oxide and assumes a near-sphere shape with the average size of 1.5 μm. The material possesses well magnetic response, and the specific saturated magnetizing strength reaches 18.9 A？m2/kg, which can be easily magnetic separated from water. Dramatically, the adsorptivity of the material is nearly equivalent to powder active carbon, for example, the removal efficiency of methylene blue (10 mg/L) reaches to 92.3% in 5 min, which contributes to the chemical adsorption between the methylene blue and the material. Therefore, this facile solvothermal method can be applied to dispose iron mud with low-iron-content and make the mud into recoverable resource. Moreover, the prepared magnetic material has a potential application on the treatment of dye wastewater.
Key words: Fe3O4; methylene blue; groundwater treatment plant; iron mud; solvothermal synthesis
