Design and Preparation of Chitosan-Crosslinked Bismuth Ferrite/Biochar Coupled Magnetic Material for Methylene Blue Removal
Design and Preparation of Chitosan-Crosslinked Bismuth Ferrite/Biochar Coupled Magnetic Material for Methylene Blue Removal
复制标题
壳聚糖交联铁酸铋/生物炭耦合磁性材料的设计与制备用于去除亚甲基蓝
DOI：
10.3390/ijerph17010006
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发表时间：
2020-01-01
影响因子：
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通讯作者：
Luo, Lerong
中科院分区：
文献类型：
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作者：
Cai, Xiaoxi;Li, Jiang;Luo, Lerong
将纤维植物红麻热解获得的生物炭与铁酸铋(BiFeO3)在含壳聚糖的乙酸溶液中混合、磁化和改性，制备壳聚糖交联的BiFeO3/生物炭耦合磁性材料。利用溶解在水中的亚甲基蓝考察了复合材料的吸附性能，并研究了pH、亚甲基蓝浓度、反应时间和温度等外部条件对吸附性能的影响。利用动力学模型和等温线模型对吸附数据进行拟合和分析，结果表明BiFeO3/生物炭偶联磁性材料能有效吸附亚甲基蓝。该磁性材料的吸附量随着初始亚甲基蓝浓度、反应时间和温度的增加而增加，并且在中性和碱性条件下吸附性能得到改善。拟一级动力学模型和Langmuir等温线模型较好地拟合了吸附数据，表明亚甲基蓝的吸附涉及化学吸附和物理吸附。 BiFeO3/生物炭耦合磁性材料在25℃下对亚甲基蓝的最大吸附容量达到18.942 mg.g(-1)，证实了该材料优异的染料结合活性。
Biochar obtained by pyrolysis of the fiber plant kenaf was mixed with bismuth ferrite (BiFeO3) in a chitosan-containing acetic acid solution, magnetized, and modified to prepare a chitosan-crosslinked BiFeO3/biochar coupled magnetic material. The adsorption properties of the composite were investigated using methylene blue dissolved in water, and the effects of external conditions, such as pH, methylene blue concentration, reaction time, and temperature, on the adsorption performance were studied. The adsorption data were fitted and analyzed with kinetic and isotherm models, and the results showed that the BiFeO3/biochar coupled magnetic material effectively adsorbed methylene blue. The amounts adsorbed onto this magnetic material increased with increasing initial methylene blue concentration, reaction time, and temperature, and the adsorption performance improved under neutral and alkaline conditions. The pseudo-first-order kinetic and Langmuir isotherm models satisfactorily fitted the adsorption data, showing that the adsorption of methylene blue involved both chemical and physical adsorption. The maximum adsorption capacity of methylene blue onto the BiFeO3/biochar coupled magnetic material reached 18.942 mg.g(-1) at 25 degrees C, confirming the excellent dye binding activity of this material.