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Enhanced Removal of Pb(II) from Aqueous Solution using EDTA‐Modified Magnetic Graphene Oxide
Clean - Soil Air Water ( IF 1.7 ) Pub Date : 2021-01-21 , DOI: 10.1002/clen.202000272
Cuijuan Xing 1 , Aiqing Xia 1 , Ling Yu 1 , Lili Dong 1 , Yongchao Hao 1 , Xingcun Qi 1
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Ethylenediaminetetraacetic acid (EDTA) groups are successfully linked to magnetic graphene oxide (MGO) by a silanization reaction between N‐(trimethoxysilylpropyl) ethylenediaminetriacetic acid and OH on the surface of MGO. The EDTA‐modification enhances the adsorption capacity of MGO because of the chelating ability of EDTA. The adsorption behavior of Pb(II) and the effects of solution conditions such as contact time, initial Pb(II) concentration, and pH (1–9) are investigated. The adsorption capacity for Pb(II) removal is found to be 211.3 mg g−1 and the adsorption process is completed at pH 6.8 within 50 min. The process is shown to follow a pseudo‐second‐order kinetic rate. The isothermal data reveal that the adsorption process of Pb(II) is well‐matched with the Freundlich model. In addition, the magnetic composite can be effectively and simply separated by an external magnetic field. Therefore, MGO‐EDTA can potentially serve as an adsorbent for the separation and removal of Pb(II) from water.

中文翻译:

使用EDTA修饰的氧化石墨烯增强水溶液中的Pb(II)去除

乙二胺四乙酸(EDTA)基团通过之间的硅烷化反应成功连结至磁性氧化石墨烯(MGO)Ñ(三甲氧基甲硅烷)乙二胺三乙酸和- OH MGO的表面上。EDTA改性由于EDTA的螯合能力而增强了MGO的吸附能力。研究了Pb(II)的吸附行为以及溶液条件如接触时间,初始Pb(II)浓度和pH(1–9)的影响。发现去除Pb(II)的吸附容量为211.3 mg g -1并在50分钟内在pH 6.8下完成吸附过程。结果表明,该过程遵循伪二级动力学速率。等温数据表明,Pb(II)的吸附过程与Freundlich模型完全匹配。另外,可以通过外部磁场有效且简单地分离磁性复合材料。因此,MGO-EDTA可以潜在地用作从水中分离和去除Pb(II)的吸附剂。
更新日期:2021-01-21
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