Department of Chemistry & Biochemistry, Montclair State University, Montclair, New Jersey 07043, USA.
ACS Appl Mater Interfaces. 2012 Mar;4(3):1186-93. doi: 10.1021/am201645g. Epub 2012 Feb 15.
Chelating groups are successfully linked to graphene oxide (GO) surfaces through a silanization reaction between N-(trimethoxysilylpropyl) ethylenediamine triacetic acid (EDTA-silane) and hydroxyl groups on GO surface. EDTA-GO was found to be an ideal adsorbent for Pb(II) removal with a higher adsorption capacity. EDTA-modification enhances the adsorption capacity of GO because of the chelating ability of ethylene diamine triacetic acid. This study investigates the adsorption and desorption behaviors of heavy metal cations and the effects of solution conditions such as pH on Pb(II) removal. The adsorption capacity for Pb(II) removal was found to be 479 ± 46) mg/g at pH 6.8, and the adsorption process was completed within 20 min. The Langmuir adsorption model agrees well with the experimental data. The experimental results suggest that EDTA-GO can be reused after washed with HCl, suggesting potential applications in the environmental cleanup.
螯合基团通过 N-(三甲氧基硅丙基)乙二胺三乙酸（EDTA-硅烷）与 GO 表面上的羟基之间的硅烷化反应成功连接到氧化石墨烯（GO）表面上。发现 EDTA-GO 是一种理想的用于去除 Pb(II)的吸附剂，具有更高的吸附容量。EDTA 修饰增强了 GO 的吸附能力，因为乙二胺四乙酸的螯合能力。本研究研究了重金属阳离子的吸附和解吸行为以及溶液条件（如 pH 值）对 Pb(II)去除的影响。在 pH 值为 6.8 时，Pb(II)去除的吸附容量为 479 ± 46) mg/g，吸附过程在 20 分钟内完成。Langmuir 吸附模型很好地符合实验数据。实验结果表明，EDTA-GO 可以在经过 HCl 洗涤后重复使用，这表明其在环境清理方面有潜在的应用。
