Removal of phosphorus using a hydrotalcite-like compound. Application to the filed of medicine/environmental technology.

  • Ookubo A
ISSN: 0470-6455
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Abstract

A review. A Cl- intercalated hydrotalcite-like compd. (Cl/LDH) was prepd. by neutralizing magnesium and aluminum chlorides with sodium hydroxide. A Cl- ions in the interlayer of Cl/LDH can be exchanged with phosphate equivalently. The isotherm for phosphate uptake followed the Langmuir equation at pH 7.53 and 310 K; it gave an ion-exchange capacity of 2.37 mmol of P/g for phosphate. The process of phosphate/Cl- ion exchange could be divided into three stages depending on the amt. (Pload) of phosphate loading. In stage I (0% < Pload < 6%), the Cl--intercalated phase (interlayer distance = 0.30 nm) alone was obsd. In stage II (6% < Pload < 80%), the phase transition from the Cl--intercalated phase to the phosphate-exchanged phase (interlayer distance = 0.36 nm) took place. In stage III (80% < Pload < 100%), the phosphate-exchanged phase alone was obsd.; the interlayer distance increased slightly (from 0.36 to 0.37 nm) with an increase in the phosphate loading, indicating a formation of solid soln. The phosphate/Cl- ion-exchange reaction with Cl/LDH was not affected by the presence of trypsin. On the other hand, the trypsin adsorption was significantly depressed by the loading of phosphate. In the removal of phosphate from brackish river water using Cl/LDH, Kawamoto et al. indicated that phosphorus concns. in the river water went up from 0.1 mg P dm-3 to 0.02 mg P dm-3 under the condition of a column method with a space velocity of 5.0 h-1. The value of 0.02 mg P dm-3 was considered to be enough for the repression of algae growth. As a zero-emission type phosphorus removal system, Oshima et al. suggested that two-step regeneration system, which uses a NaOH-NaCl mixed aq. soln. as the desorbing soln. and a MgCl2 aq. soln. as the regenerating soln. Moreover, phosphate ions can be recovered as magnesium ammonium phosphate (MAP) from the desorbing soln. in the system. [on SciFinder(R)]

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APA

Ookubo, Akira. (2011). Removal of phosphorus using a hydrotalcite-like compound. Application to the filed of medicine/environmental technology. Nendo Kagaku, 49(3), 113–119.

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