Efficient adsorption removal and adsorption mechanism of basic fuchsin by recyclable Fe₃O₄@CD magnetic microspheres

Abstract

Excessive discharge of dye wastewater has brought serious harm to human health and the environment. In this paper, a magnetic absorbent, ferroferric oxide@β-cyclodextrin (Fe₃O₄@CD), was prepared for the efficient adsorption removal of basic fuchsin (BF) from dye wastewater, based on the special amphiphilicity of β-CD and the strong magnetism of Fe₃O₄. A series of influence factors including the initial dye concentration, adsorbent dosage, temperature and pH were investigated, as well as the adsorption mechanism. The results show that Fe₃O₄@CD has the best adsorption and removal effect on BF dye at room temperature and neutral pH, when the initial concentration of dye is 25 mg/L and the adsorbent dosage is 100 mg. The adsorption behavior conforms to the pseudo-second-order kinetics and the Langmuir adsorption isotherm, and the adsorption process is spontaneously endothermic. Fe₃O₄@CD adsorbed with BF dye can be rapidly separated under an external magnetic field and then easily regenerated by HCl treatment. After 5 times of recycling, the removal rate of the prepared magnetic composite on BF dye is kept above 75%. This work will provide an economic and eco-friendly technology for the treatment of the actual dye wastewater.

Keywords

Fe₃O₄@CD magnetic microspheres / adsorption removal / basic fuchsin

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