Synthesis of mesoporous 2-line ferrihydrite/γ-Al2O3 hybrid adsorbent for the effective adsorption of phosphate for water remediation

Autor: Seung-Joon Yoo
Rok vydání: 2021
Předmět:
Zdroj: Korean Journal of Chemical Engineering. 38:326-336
ISSN: 1975-7220
0256-1115
DOI: 10.1007/s11814-020-0708-x
Popis: A 2-line ferrihydrite/γ-A2O3 hybrid adsorbent (Fh/γ-Al2O3 hybrid adsorbent) precipitated on 10wt% of γ-Al2O3 seed for the effective adsorption of phosphate in water was synthesized from wastewater containing ferric sulfate. The use of γ-Al2O3 seeds for particle initiation made it possible to prepare larger particles that would allow a liquid to flow through. The synthesized Fh/γ-Al2O3 hybrid adsorbent was characterized by X-ray diffraction, 27Al-MAS NMR, N2 adsorption/desorption, SEM analysis, and EpHL measurements. The adsorption performance of phosphate on the synthesized Fh/γ-Al2O3 hybrid adsorbent was evaluated by batch and column tests at phosphate concentration below 10 ppm, which corresponds to the actual phosphate concentration of natural systems. The adsorption mechanism suggested by the batch test was in good agreement with the Langmuir adsorption model, with a maximum adsorption capacity of 33.2 mg/g. On the other hand, the experiment with the column obtained a maximum adsorption capacity of 33.6 mg/g for a volumetric flow rate of 10.25 BV/min and an influent phosphate concentration of 4.75 ppm on 0.5 g of adsorbent. The Fh/γ-Al2O3 hybrid adsorbent was shown to have superior adsorption characteristics to those of other previous research in terms of cost, adsorption efficiency, contact time, maximum adsorption capacity, and desorption efficiency of 95% from the experimental condition based on the surface characterization of the adsorbent.
Databáze: OpenAIRE
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