Removal of ammonium and phosphate from aqueous solution by magnetite/zeolite composite
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    Abstract:

    The adsorption of ammonium and phosphate from aqueous solution on magnetite/zeolite composite (MZC) as a function of adsorbent dosage, solution pH, reaction time, initial adsorbate concentration, and coexisting ions was investigated. The ammonium and phosphate removal efficiencies of MZC increased with increasing adsorbent dosage. The ammonium adsorption capacity for MZC was relatively high at pH 4 9, and decreased with increasing pH from 9 to 11. The phosphate adsorption capacity for MZC decreased with increasing pH from 4 to 11. The adsorption kinetics of ammonium and phosphate on MZC could be described by a pseudo second order kinetic model. The equilibrium adsorption data of ammonium on MZC could be described by the Langmuir isotherm model. The equilibrium adsorption data of phosphate on MZC could be described by the Langmuir, Freundlich and Dubinin Radushkevich isotherm models. Coexisting Ca2+, Na+or K+ in solution reduced the adsorption of ammonium on MZC. Coexisting Cl-, SO42- or NO3- in solution slightly enhanced the adsorption of phosphate on MZC, while coexisting HCO3- slightly reduced the adsorption of phosphate on MZC. The ammonium molecules adsorbed on MZC could be completely desorbed in 0.1 mol/L NaCl solution. Most of phosphate molecules adsorbed on MZC could be desorbed in 0.1 mol/L NaOH solution.

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詹艳慧,林建伟,王 虹,王昕睿,黄 娜,欧阳丹.四氧化三铁-沸石复合材料去除水中铵和磷酸盐研究[J].上海海洋大学学报,2013,22(3):376-383.
ZHAN Yan-hui, LIN Jian-wei, WANG Hong, WANG Xin-rui, HUANG Na, OUYANG Dan. Removal of ammonium and phosphate from aqueous solution by magnetite/zeolite composite[J]. Journal of Shanghai Ocean University,2013,22(3):376-383.

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  • Online: May 24,2013
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