Ethylenediamine-modified activated carbon for aqueous lead adsorption |
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Authors: | Jianzhong Zhu John Yang Baolin Deng |
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Institution: | (1) Center for Environmental Sciences, Lincoln University of Missouri, Jefferson City, MO 65102, USA;(2) Department of Civil and Environmental Engineering, University of Missouri, Columbia, MO 65211, USA; |
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Abstract: | This study is to develop a carbon-based adsorbent containing multiple functional ligands for effective removal of lead ions
from aqueous media. Activated carbon was oxidized by nitric acid, followed by chlorination with thionyl chloride and reaction
with ethylenediamine. Modified activated carbon (MAC) was characterized using scanning electron microscopy in conjunction
of energy dispersive spectroscopy (SEM-EDS), Fourier transform infrared spectroscopy (FT-IR), and potentiometric titration.
Surface characterizations confirmed that carboxyl, amine, and chlorine functional groups were effectively introduced onto
the carbon surface by the treatments. The modifications lowered the pH at the point of zero charge (pHpzc) from 9.6 to 2.55 and resulted in more negatively charged surfaces. Adsorptive experiments showed that aqueous Pb removal
by MAC was faster, with a 62% higher capacity than the original activated carbon (60.2 vs. 37.2 mg g−1). |
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