Abstract
A magnetic sodium alginate (SA)-modified zeolite (SA/zeolite/Fe 3 O 4 ) composite was prepared using the precipitation method to remove methylene blue (MB) from wastewater. SA was deposited on the surface of zeolite through CaCl 2 cross-linked precipitation. Meanwhile, Fe 3 O 4 nanoparticles were coated by SA and precipitated onto the surface of zeolite. The carboxyl group was introduced through SA modification, which enhanced the cationic adsorption capacity of the SA/zeolite/Fe 3 O 4 composite compared with that of zeolite. Characterization analysis indicated that SA and Fe 3 O 4 were successfully loaded onto the surface of zeolite. The effect of initial pH and results of co-existing cation adsorption experiments showed that the adsorption of MB molecules on the surface of the SA/zeolite/Fe 3 O 4 composite mainly relied on electrostatic attraction. Infrared spectroscopic and X-ray photoelectron spectroscopic analyses proved that the mechanism underlying the adsorption between MB molecules and the SA/zeolite/Fe 3 O 4 composite was ion exchange. Results of the adsorption model fitting showed that the adsorption process was well described by pseudo-second-order kinetics and the Langmuir isothermal line model. Adsorption thermodynamic studies suggested that the adsorption was a spontaneous exothermic process, and Langmuir analysis revealed that the theoretical maximum adsorption capacity was 181.85 mg/g. In addition, the regeneration study indicated that the adsorption was suitable for four cycles. This study suggests that the SA/zeolite/Fe 3 O 4 composite is an ideal adsorbent for the removal of cationic dyes from an aqueous medium. • Surface-modified zeolite with SA and nano Fe 3 O 4 particles to prepare SA/zeolite/Fe 3 O 4 . • We elucidate the structural properties of SA/zeolite/Fe 3 O 4 composite. • SA/zeolite/Fe 3 O 4 adsorbed MB well by electrostatic attraction and exhibited good regenerability.
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