Title: Adsorption of phosphate by calcined Mg-Al-Fe layered double hydroxides
Abstract: A series of MgAlFe layered double hydroxides(LDH)were synthesized by a coprecipitation method and were calcined at different temperatures for 4 h to prepare calcined layered double hydroxides(CLDH).The samples were characterized by XRD and FT-IR to investigate the performance and mechanism of phosphate adsorption.The results showed that the layered structure was destroyed with excessive iron and increased Fe loading led to the decrease of the sorption efficiency.CLDH-0.1-300 with Mg/Al/Fe molar ratio of 2 ∶ 0.9 ∶ 0.1 and calcined at 300 ℃ had the highest phosphate adsorption capacity.The maximum sorption capacity reached 27.03 mg · g-1,which was 32% higher than the uncalcined material.CLDH-0.1-300 showed excellent performance in phosphate adsorption from the solution with co-existing anions in a pH range of 4—11.Moreover,CLDH-0.1-300 exhibited remarkable adsorption capacity for phosphate in wastewater samples.The adsorption kinetics and the adsorption isotherm followed pseudo second-order model and the Langmuir model respectively.The adsorbed phosphate was desorbed from CLDH-0.1-300 effectively with 0.5 mol · L-1 NaOH solution to regenerate adsorbent and the adsorption capacity was still close to 60% of the initial value after three cycles of the adsorption-regeneration-adsorption.
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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Cited By Count: 3
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