Adsorption Behavior of EDTA-Graphene Oxide for Pb (II) Removal

Abstract

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.

Removal of heavy metals and pollutants by membrane adsorption techniques

“…Meidanchi and Akhavan (2014) Table 11 shows absorption capacity of different heavy metals on GO MMM. Madadrang et al (2012) linked the chelating groups to graphine oxide surfaces via a silanization reaction between N-(trimethoxysilylpropyl) ethylenediamine triacetic acid (EDTA-silane) and hydroxyl groups on GO surface. The adsorption capacity for Pb(II) removal was found to be 479 ± 46 mg/g at pH 6.8.…”

Isotherm Models of Heavy Metal Sorption onto Zinc-tricarboxylic

“…20 mg/L Pb(II) and 20 mg/L Cu(II) working solutions were prepared from the 1000 mg/L stock solutions. HNO 3 and NaOH were used to adjust pH of Pb(II) and Cu(II) working solutions to 6 ± 0.5 and 5 ± 0.5, respectively [3,22]. In the batch experiments, 0.5 g of Zn-BTC was added to Pb(II) and the Cu(II) working solutions separately.…”

“…Cu 3 (BTC) 2 -SO 3 H also exhibited high Cd(II) uptake capacity, thus has a potential use for cadmium removal [19]. Other type of MOFs previously used in heavy metals absorption studies were Graphene Oxides (GO) [4], [6], EDTA-Graphene Oxide (EDTA-GO) [3], [20] for Pb(II) removal and MOF-5 [16] and Graphene Oxides-CdS [21] for Cu(II) removal. However, an optimum experimental conditions to maximize heavy metals absorption efficiency of MOFs were not well studied.…”

Environmental applications using graphene composites: water remediation and gas adsorption

“…Madarang and co-workers have shown that using a EDTA-GO composite material the Pb(II) adsorption capacity is higher than for GO or EDTA-rGO. 48 This is due to the additional binding sites available for the Pb(II) contaminant when both GO and EDTA are present in the composite material.…”