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- Synthesized Zr(4+) incorporated MgAl-layered double hydroxides (Mg(AlZr)-LDH) with varying Mg/(Al+Zr) molar ratios to explore their phosphate ion uptake behavior.
- CO(3)-type LDH materials exhibited low crystallinity at room temperature, while Cl-type LDH with high crystallinity was successfully created using hydrothermal treatment.
- The CO(3)-type LDH showed significantly higher phosphate ion uptake compared to Cl-type materials, achieving maximum take-ups of 30 mg-P/g in wastewater and 16 mg-P/g in seawater, attributed to complex formation with Zr(IV) centers.
Article Abstract
We synthesized Zr(4+) incorporated MgAl-layered double hydroxides, Mg(AlZr)-LDH(A) (where A denotes a counteranion in the interlayer space and is expressed as CO(3) for carbonate and Cl for chloride ions), with different molar ratios of Mg/(Al+Zr). Then we characterized their uptake behavior toward phosphate ions. CO(3)-type tertiary LDH materials synthesized at room temperature show low crystallinity, whereas the highly crystalline Cl-type tertiary LDH, [Mg(0.68)Al(0.17)Zr(0.14)(OH)(2)][Cl(0.26)(CO(3))(0.04)1.24H(2)O], was synthesized for the first time using a hydrothermal treatment at 120 degrees C. The distribution coefficients (K(d)) of oxo-anions were measured with a mixed solution containing trace amounts of the anions. The selectivity sequences were Cl(-), NO(-)(3)
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http://dx.doi.org/10.1016/j.jcis.2007.04.004 DOI Listing Publication Analysis
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