Chloride-hydrogenophosphate ion exchange into the zinc–aluminium–chloride layered double hydroxide

Badreddine, Mohamed; Khaldi, Mohammed; Legrouri, A.; Barroug, Allal; Chaouch, Mehdi; Roy, A. De; Besse, J.P.

doi:10.1016/s0254-0584(97)02050-6

Cited by 45 publications

(32 citation statements)

References 17 publications

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“…The basal distance also does not vary appreciably. This observation is in direct contrast with the phosphate-containing LDHs, which show substantial variation in the basal distance with equilibration time, as noted elsewhere [29]. These results point out that the interlayer regions of arsenic-containing LDHs are less flexible than with sulfate-or …”

Section: Effect Of Equilibration Timesupporting

confidence: 66%

Synthesis and characterization of arsenate-intercalated layered double hydroxides (LDHs): Prospects for arsenic mineralization

Prasanna

Kamath

2009

Journal of Colloid and Interface Science

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The arsenate-intercalated layered double hydroxide (LDH) of Mg and Al is synthesized by coprecipitation. The higher thermodynamic stability and the consequent lower solubility of the unitary arsenates preclude the formation of arsenate-intercalated LDHs of other metals directly from solution. However other M/AlAsO 4 (M = Co, Ni, Zn) LDHs could be prepared by anion exchange, showing that arsenate intercalation proceeds topotactically. The intercalation of various species of As(V) into the interlayer of LDHs and the subsequent arsenate carrying capacity are dependent upon the pH of the solution. Upon thermal decomposition, the intercalated arsenate ion undergoes reductive deintercalation to give a mixture of As(III) and As(V) oxides. The product oxides revert back to the LDH upon soaking in water on account of the compositional and morphological metastability of the former. This is in contrast with the phosphateintercalated LDHs, in which the reversibility is suppressed, consequent to the formation of stable metal phosphates.

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Section: Effect Of Equilibration Timesupporting

confidence: 66%

Synthesis and characterization of arsenate-intercalated layered double hydroxides (LDHs): Prospects for arsenic mineralization

Prasanna

Kamath

2009

Journal of Colloid and Interface Science

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“…The band (1048 cm À1 ) of ZnAl-200 ( Fig. 5e) is assigned to m 3 (P-O) of phosphate [13,14]. The band at 1111 cm À1 of ZnAl-400 (Fig.…”

Section: Selectivity Toward Phosphatementioning

confidence: 99%

“…For the removal of phosphate ions, biological and chemical precipitations are common methods [2]; however, adsorption [3] is also a promising technique, due to phosphorus recovery and no secondary pollution. Among the large numbers of phosphate adsorbents, inorganic materials including metal oxide hydroxides [1,[4][5][6], metal oxides [7][8][9], and layered double hydroxides (LDHs) [10][11][12][13][14][15][16][17] and their calcined products [18][19][20][21] have been investigated. Table 1 summarizes the results.…”

Section: Introductionmentioning

confidence: 99%

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High adsorption selectivity of ZnAl layered double hydroxides and the calcined materials toward phosphate

Kang

et al. 2010

Journal of Colloid and Interface Science

130

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“…More than 80% of the phosphate on the LDHs can be desorbed by NaOH or NaCO 3 solution with concentrations of 5 wt% and 10 wt%, respectively. Unfortunately, carbonate anion acts as an obstacle to phosphate uptake by LDHs because of its high selectivity [34]. Therefore, using NaCO 3 in the desorption step introduces a challenge to the regeneration of the used LDHs.…”

Section: Phosphate Desorption and Ldhs Regenerationmentioning

confidence: 99%

Phosphate adsorption from sewage sludge filtrate using zinc–aluminum layered double hydroxides

Cheng

Huang

Wang

et al. 2009

Journal of Hazardous Materials

207

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a b s t r a c tA series of layered double hydroxides (LDHs) with different metal cations were synthesized to remove phosphate in waste sludge filtrate from a municipal wastewater treatment plant for phosphorus recovery and to help control eutrophication. The highest phosphate adsorption capacity was obtained by using Zn-Al-2-300, that is LDHs with Zn/Al molar ratio of 2 and calcined at 300 • C for 4 h. Circumneutral and mildly alkaline waters appeared suitable for the possible application of Zn-Al LDHs due to the amphoteric nature of aluminum hydroxide. Phosphate adsorption from the sludge filtrate by the LDHs followed pseudo-second-order kinetics, and the adsorption capacity at equilibrium was determined to be ∼50 mg P/g. Adsorption isotherms showed that phosphate uptake in this study was an endothermic process and had a good fit with a Langmuir-type model. The absorbed phosphate can be effectively desorbed (more than 80%) from LDHs particles by a 5 wt% NaOH solution. The regeneration rate of used LDHs was ∼60% after six cycles of adsorption-desorption-regeneration.

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Chloride-hydrogenophosphate ion exchange into the zinc–aluminium–chloride layered double hydroxide

Cited by 45 publications

References 17 publications

Synthesis and characterization of arsenate-intercalated layered double hydroxides (LDHs): Prospects for arsenic mineralization

Synthesis and characterization of arsenate-intercalated layered double hydroxides (LDHs): Prospects for arsenic mineralization

High adsorption selectivity of ZnAl layered double hydroxides and the calcined materials toward phosphate

Phosphate adsorption from sewage sludge filtrate using zinc–aluminum layered double hydroxides

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