Mechanism and model of dynamic adsorption of glyphosate contaminated water on graphene-based iron oxide composite
(2.College of Environment and Resources, Jilin University, Changchun, Jilin, China 130021)
【Abstract】Reduced graphene-based iron oxide composite was prepared via thermal chemical deposition method and used to remove glyphosate (GLY) contaminated water by a dynamic adsorption experiment. The influences of GLY concentration, solution pH, flow rate and filler bed height were analyzed. The dynamic adsorption mechanism was characterized by SEM-EDS, XPS and BET, as well as Thomas, Yoon-Nelson and Yan adsorption models. The results demonstrated that the GLY adsorptivity increased and the breakthrough time decreased with the increase of the initial GLY concentration. However, the breakthrough time prolonged when the adsorbent mass was increased. In contrast, the GLY adsorptivity and the breakthrough time decreased with an increase in the pH value and flow rate. The fitting results matched Thomas, Yoon-Nelson and Yan models well, and the theoretical adsorption capacities were in good agreement with the experimental data. To study the dynamic adsorption process and the adsorption microscopic mechanism is of vital theoretical and practical significance for the popularization of graphene materials and the treatment of GLY contaminated water.
【Keywords】 composites; glyphosate pollution; adsorption; breakthrough curve; model;
(Translated by MA XQ)
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