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Magnetic Mesoporous Carbons Derived from in Situ MgO Template Formation for Fast Removal of Heavy Metal Ions
ACS Omega ( IF 3.7 ) Pub Date : 2018-04-03 00:00:00 , DOI: 10.1021/acsomega.7b01989 Qiangying Zhang 1 , Man He 1 , Beibei Chen 1 , Bin Hu 1
ACS Omega ( IF 3.7 ) Pub Date : 2018-04-03 00:00:00 , DOI: 10.1021/acsomega.7b01989 Qiangying Zhang 1 , Man He 1 , Beibei Chen 1 , Bin Hu 1
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In this paper, magnetic mesoporous carbon composites were prepared by calcination of the mixture of magnesium citrate and Fe3O4@SiO2 in an inert atmosphere. A high content of Fe3O4@SiO2 and MgO was in situ embedded in a carbon matrix. After removing the MgO template by diluted acid, the resulting material (Fe3O4@SiO2@mC) was subjected to further H2O2 oxidation treatment. The formed oxygen-containing functional groups on the products provided plenty of active sites for the adsorption of analytes of interest. The obtained composites (Fe3O4@SiO2@mC-H2O2) exhibited a mesoporous structure with a high specific surface area of 731 m2 g–1. The adsorption capacities of Fe3O4@SiO2@mC-H2O2 for Cu(II) and Pb(II) were calculated to be 86.5 and 156 mg g–1, respectively. Under optimal conditions, the adsorption isotherm of Cu(II) and Pb(II) onto Fe3O4@SiO2@mC-H2O2 fitted the Langmuir model and the adsorption kinetic was well-correlated with the pseudo-second-order model. Besides, Fe3O4@SiO2@mC-H2O2 exhibited fast removal dynamics (within less than 1 min) for Cu(II) and Pb(II), demonstrating great application potential in wastewater treatment.
中文翻译：
磁性介孔碳衍生自原位MgO模板形成，用于快速去除重金属离子
本文通过在惰性气氛中煅烧柠檬酸镁和Fe 3 O 4 @SiO 2的混合物制备磁性介孔碳复合材料。高含量的Fe 3 O 4 @SiO 2和MgO原位嵌入碳基质中。除去由稀酸MgO的模板后，将得到的材料（铁3 ö 4 @SiO 2 @mC）进行进一步ħ 2 ö 2氧化处理。产品上形成的含氧官能团为吸附目标分析物提供了大量的活性位点。所得复合材料（Fe 3O 4 @SiO 2 @ mC-H 2 O 2）表现出具有731 m 2 g –1的高比表面积的中孔结构。计算得出Fe 3 O 4 @SiO 2 @ mC-H 2 O 2对Cu（II）和Pb（II）的吸附容量分别为86.5和156 mg g –1。在最佳条件下，Cu（II）和Pb（II）在Fe 3 O 4 @SiO 2 @ mC-H 2 O 2上的吸附等温线拟合Langmuir模型，吸附动力学与拟二阶模型良好相关。此外，Fe 3 O 4 @SiO 2 @ mC-H 2 O 2表现出对Cu（II）和Pb（II）的快速去除动力学（不到1分钟），显示了在废水处理中的巨大应用潜力。
更新日期：2018-04-03
中文翻译：
磁性介孔碳衍生自原位MgO模板形成，用于快速去除重金属离子
本文通过在惰性气氛中煅烧柠檬酸镁和Fe 3 O 4 @SiO 2的混合物制备磁性介孔碳复合材料。高含量的Fe 3 O 4 @SiO 2和MgO原位嵌入碳基质中。除去由稀酸MgO的模板后，将得到的材料（铁3 ö 4 @SiO 2 @mC）进行进一步ħ 2 ö 2氧化处理。产品上形成的含氧官能团为吸附目标分析物提供了大量的活性位点。所得复合材料（Fe 3O 4 @SiO 2 @ mC-H 2 O 2）表现出具有731 m 2 g –1的高比表面积的中孔结构。计算得出Fe 3 O 4 @SiO 2 @ mC-H 2 O 2对Cu（II）和Pb（II）的吸附容量分别为86.5和156 mg g –1。在最佳条件下，Cu（II）和Pb（II）在Fe 3 O 4 @SiO 2 @ mC-H 2 O 2上的吸附等温线拟合Langmuir模型，吸附动力学与拟二阶模型良好相关。此外，Fe 3 O 4 @SiO 2 @ mC-H 2 O 2表现出对Cu（II）和Pb（II）的快速去除动力学（不到1分钟），显示了在废水处理中的巨大应用潜力。
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