Abstract
A method for grafting ethylenediamine to a magnetic graphene oxide composite (EDA-GO@Fe3O4) was developed for Cr(VI) decontamination. The physicochemical properties of EDA-GO@Fe3O4 were characterized using HRTEM, EDS, FT-IR, TG-DSC, and XPS. The effects of pH, sorbent dose, foreign anions, time, Cr(VI) concentration, and temperature on decontamination process were studied. The solution pH can largely affect the decontamination process. The pseudo-second-order model is suitable for being applied to fit the adsorption processes of Cr(VI) with GO@Fe3O4 and EDA-GO@Fe3O4. The intra-particle diffusion is not the rate-controlling step. Isotherm experimental data can be described using the Freundlich model. The effects of multiple factors on the Cr(VI) decontamination was investigated by a 25−1 fractional factorial design (FFD). The adsorption process can significantly be affected by the main effects of A (pH), B (Cr(VI) concentration), and E (Adsorbent dose). The combined factors of AB (pH × Cr(VI) concentration), AE (pH × Adsorbent dose), and BC (Cr(VI) concentration × Temperature) had larger effects than other factors on Cr(VI) removal. These results indicated that EDA-GO@Fe3O4 is a potential and suitable candidate for treatment of heavy metal wastewater.
Highlights
Heavy metal pollution is a current worldwide environmental concern because it can harm ecosystems and endanger human health
N arose mainly from the amino groups in the grafted ethylenediamine, which indicated that ethylenediamine had been successfully introduced into the graphene oxide (GO)@Fe3O4
The calculated qe values for the pseudo-second-order model were very close to the experimental data. These results indicate that the pseudo-second-order model is more suitable to describe the adsorption experimental data, indicating that chemical adsorption reaction is the dominant rate-limiting step for both adsorption processes
Summary
Heavy metal pollution is a current worldwide environmental concern because it can harm ecosystems and endanger human health. Chromium has been widely used in electroplating, tanning, dying, smelting, and corrosion protection [1,2,3]. Cr (VI), one form of chromium, is very harmful to most organisms due to its mammalian toxicity. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript
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