| 基于石墨烯载体的铁基材料制备及除砷性能比较 |
| 摘要点击 1859 全文点击 1169 投稿时间：2013-01-07 修订日期：2013-03-11 |
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| 中文关键词 石墨烯 磁铁矿 赤铁矿 零价铁 除砷 |
| 英文关键词 graphene magnetite hematite zero-valence-iron arsenic removal |
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| 中文摘要 |
| 以氧化石墨为前驱体,分别将磁铁矿、赤铁矿和零价铁负载到石墨烯上,通过FTIR和XRD对其进行表征,成功地制备出石墨烯负载磁铁矿(M-RGO)、石墨烯负载赤铁矿(H-RGO)和石墨烯负载零价铁(N-RGO)这3种复合材料. 研究比较了3种复合材料的除砷性能,如吸附动力曲线、吸附等温线、pH值范围和共存离子对除砷效果影响. 结果表明,3种材料吸附As(Ⅲ)的动力曲线遵从准二级动力学模型,吸附等温线符合Langmuir模型,在相同条件下,其吸附容量依次为N-RGO>M-RGO>H-RGO. 3种材料均在弱酸性至中性条件下对As(Ⅲ)有较好的吸附效果,M-RGO和H-RGO材料受pH值影响较小,且吸附As(Ⅲ)的最佳pH值范围较N-RGO材料宽. 3种材料中,N-RGO材料抗共存离子干扰能力较强,其次是H-RGO材料,M-RGO材料最差. |
| 英文摘要 |
| FTIR and XRD showed that three hybid materials which were M-RGO、H-RGO and N-RGO were successfully made from graphene oxide with magnetite, hematite and zero-valence iron respectively. The arsenic removal performance, such as adsorption kinetics, adsorption isotherm, appropriate pH range and resistance to co-existing ions were studied and compared. Results showed that the adsorption of arsenic on three materials fit pseudo-second-order kinetics, and the adsorption isotherm was consistent with the Langmuir model, while the order of adsorption capacities was: N-RGO>M-RGO>H-RGO. Three materials had better adsorptions of As(Ⅲ) under the condition of weak acid to neutral, the M-RGO and H-RGO materials were less influenced by the pH, and their pH ranges for adsorbing As(Ⅲ) were wider than that of N-RGO material. In these three materials, N-RGO was least affected by co-existing ions, H-RGO was the second, and M-RGO was most affected. |
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