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• W2353340103 abstract "In this study, a novel hydroxyapatite/magnetite/zeolite (HAP/Fe3O4/Zeo) composite was prepared, characterized and used as an adsorbent to remove Congo red (CR) from aqueous solution. The adsorption characteristics of CR from aqueous solution on the HAP/Fe3O4/Zeo composite were investigated using batch experiments. Results showed that the HAP/Fe3O4/Zeo composite was effective for the removal of CR from aqueous solution. The CR adsorption capacity for the HAP/Fe3O4/Zeo composite decreased with solution pH increasing from 3 to 4 or solution pH increasing from 7 to 11, and remained basically unchanged with pH increasing from 4 to 7. The CR removal efficiency of the HAP/Fe3O4/Zeo composite increased with increasing adsorbent dosage, while the amount of CR adsorbed on the HAP/Fe3O4/Zeo composite decreased with increasing adsorbent dosage. The adsorption kinetic data of CR on the HAP/Fe3O4/Zeo composite well fitted a pseudo-second-order model. The equilibrium adsorption data of CR on the HAP/Fe3O4/Zeo composite could be described by the Langmuir and Freundlich isotherm models. The maximum monolayer adsorption capacity for CR derived from the Langmuir isotherm model was determined to be 117 mg x g(-1) at pH 7 and 303 K. The adsorption process of CR on the HAP/Fe3O4/Zeo composite was spontaneous and endothermic. The main mechanisms for the adsorption of CR on the HAP/Fe3O4/Zeo composite at pH 7 included surface complexation, hydrogen bonding and Lewis acid-base reaction. Thermal regeneration showed that the HAP/Fe3O4/Zeo composite could be used for five desorption-adsorption cycles with high removal efficiency for CR in each cycle. X-ray diffraction (XRD) analysis revealed that the HAP/Fe3O4/zeolite composite contained Fe3O4, and this composite had relatively high saturation magnetization. The HAP/Fe3O4/Zeo composite adsorbed with CR could be collected from aqueous solution under an external magnetic field quickly. Results of this study suggested that the HAP/Fe3O4/Zeo composite should be applicable for the removal of CR from wastewater." @default.
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• W2353340103 date "2014-08-01" @default.
• W2353340103 modified "2023-10-18" @default.
• W2353340103 title "[Synthesis of hydroxyapatite/magnetite/zeolite composite for Congo red removal from aqueous solution]." @default.
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