Abstract
To enhance the surface hydrophilicity, adsorption capacity to various ionic dyes, and recovery efficiency, modified expanded graphite (MEG) was fabricated by surfactant-based intercalating reagent CTAB/KBr modification of expanded graphite (EG). Then magnetic composite adsorbents (Fe3O4/xMEG) were following synthesized with introduction of in-situ formed magnetic Fe3O4 by two different ways. The adsorption of Orange-II on Fe3O4/3MEG-I was evaluated to understand its effectiveness for dyestuff wastewater treatment. The Fe3O4/3MEG-I exhibited a rapid adsorption efficiency (47% within 2 min) and tunable adsorption properties with adjusting MEG amount, the adsorption process fitted better to the Langmuir isotherm and pseudo-second-order kinetic models. The removal efficiencies of a variety of dyes suggested that Fe3O4/3MEG-I could efficiently adsorb both the anionic and cationic dyes under neutral condition. The regeneration and reusability of the adsorbent were investigated in six consecutive adsorption-desorption cycles. Furthermore, Fe3O4/3MEG-I can be readilycollected by an external magnet, which make it a promising candidate for dyes effluent treatment in practical application.
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