Phosphate uptake behavior of ZnAlZr ternary layered double hydroxides through surface precipitation

Koilraj, Paulmanickam; Srinivasan, Kannan

doi:10.1016/j.jcis.2009.09.059

Cited by 81 publications

(38 citation statements)

References 49 publications

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“…They show sharp and intense reflections at around 2 θ 11°, 23°, 60°, and 62° attributed to (0 0 3), (0 0 6), (1 1 0), and (1 1 3) planes characteristic of hydrotalcite-like materials with hexagonal crystal system. The positions of the remaining peaks are in agreement with the results reported by other researchers [34–36]. In Figure 1(a), the XRD patterns of Ni-Al-Zr (NO 3 − ) LDH with Ni/(Al+Zr) molar ratios of 1 : 1, 2 : 1, 3 : 1, and 4 : 1 are shown from a to d , respectively.…”

Section: Resultssupporting

confidence: 89%

Determination of Iodate in Food, Environmental, and Biological Samples after Solid-Phase Extraction with Ni-Al-Zr Ternary Layered Double Hydroxide as a Nanosorbent

Abdolmohammad‐Zadeh

Tavarid

Talleb

2012

The Scientific World Journal

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Nanostructured nickel-aluminum-zirconium ternary layered double hydroxide was successfully applied as a solid-phase extraction sorbent for the separation and pre-concentration of trace levels of iodate in food, environmental and biological samples. An indirect method was used for monitoring of the extracted iodate ions. The method is based on the reaction of the iodate with iodide in acidic solution to produce iodine, which can be spectrophotometrically monitored at 352 nm. The absorbance is directly proportional to the concentration of iodate in the sample. The effect of several parameters such as pH, sample flow rate, amount of nanosorbent, elution conditions, sample volume, and coexisting ions on the recovery was investigated. In the optimum experimental conditions, the limit of detection (3s) and enrichment factor were 0.12 μg mL−1 and 20, respectively. The calibration graph using the preconcentration system was linear in the range of 0.2–2.8 μg mL−1 with a correlation coefficient of 0.998. In order to validate the presented method, a certified reference material, NIST SRM 1549, was also analyzed.

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Section: Resultssupporting

confidence: 89%

Determination of Iodate in Food, Environmental, and Biological Samples after Solid-Phase Extraction with Ni-Al-Zr Ternary Layered Double Hydroxide as a Nanosorbent

Abdolmohammad‐Zadeh

Tavarid

Talleb

2012

The Scientific World Journal

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“…and Al 3? as the dominanat cations, but other cations, including Ni, Zn, Mn, Ca, Cr, Zr, and La, have been observed (Behrens et al 2010;Depege et al 1996;Koilraj and Kannan 2010;Vucelic et al 1997). Where substantial Fe 2?…”

Section: Hydrotalcite Chemistrymentioning

confidence: 99%

Hydrotalcite Formation for Contaminant Removal from Ranger Mine Process Water

et al. 2010

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Process water from the Ranger Uranium Mine requires treatment to meet stringent environmental water quality criteria. The acidic water contains substantial SO 4 , metals, and U. One novel treatment method under consideration is the use of Na-aluminate to both neutralise the process water and precipitate hydrotalcites. Hydrotalcites are a class of Mg-Al layered double hydroxide minerals with a typical endmember chemical composition:Many acidic wastewaters contain Mg and/or Al in sufficient abundance for hydrotalcite formation upon addition of alkali to achieve solution pH [ 5, and Mg and/or Al to attain a Mg:Al ratio of 2 to 3:1. The utility of hydrotalcites lies in their ability to incorporate a range of cationic (Cu 2? , UO 2 2? ), metalloid (AsO 4 3-), and (oxy)anionic contaminants (CrO 4 2-). The broad spectrum removal of contaminants, including U, also indicates that hydrotalcites and their derivatives could potentially be used as a containment material in nuclear waste repositories. In this study, Ranger process water derived from extraction of U from chloritic schist was treated with Na-aluminate sourced from Bayer process liquor, in combination with NaOH or Ca(OH) 2 . Hydrotalcites formed as the primary mineral during process water neutralisation with the ability to simultaneously remove a suite of contaminants from solution.

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“…Uncharacteristic LDH peaks observed in the diffractogram were attributed to the presence of impurities in the biogenic precursor. FTIR spectrum of the samples (Figures 4-6) is typical of hydrocalumite materials which are characterized by broad adsorption bands around 3450-3520 cm -1 attributed to v OH stretching vibration of brucite-like layers [5]. The bending vibration of the interlayer water H-OH was found at 1631 cm -1 .…”

Section: Characterisation Of Synthesised Ldh Samplesmentioning

confidence: 97%

“…m is the amount of water in moles, present in the LDH. M 2+ , M 3+ , x, and A nidentities may vary over a wide range, thus giving rise to a large class of isostructural materials with different physicochemical properties [5][6]. The stability of the structure is ensured by the hydrogen bonds between the hydroxyl groups of octahedral sheets and the intercalated species, anions and water molecules [7].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Layered Double Hydroxide Synthesised from a Green Biogenic Precursor for Phosphate Removal: Characterisations and Isotherms

Adelagun¹

2017

AJBIO

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CaCr LDH materials were synthesized by the co-precipitation method, using Gastropod shell as a biogenic source of Ca 2+. The mineralogical, surficial morphology and elemental composition analysis of the materials showed characteristics typical of hydrotalcite-like materials, composed of Ca, Cr, O, C and Cl. Batch equilibrium adsorption studies showed that phosphate sorption on the LDH reached equilibrium within 5 min with about 98% removal. The sorption of phosphate was well described by the Langmuir isotherm model. The monolayer adsorption capacity of the CaCr LDH for phosphate was 142.86 mg/g. Mechanistic studies of phosphate removal by the LDHs was elucidated via instrumental analysis, vis-a viz, SEM-EDX, XRD and FTIR. Results revealed that phosphate was removed via the combination of ion exchange and precipitation. It could be inferred that CaCr LDH synthesised using Gastropod shell as a biogenic source of Ca 2+ is a suitable adsorbent for phosphate removal from aqua system.

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Phosphate uptake behavior of ZnAlZr ternary layered double hydroxides through surface precipitation

Cited by 81 publications

References 49 publications

Determination of Iodate in Food, Environmental, and Biological Samples after Solid-Phase Extraction with Ni-Al-Zr Ternary Layered Double Hydroxide as a Nanosorbent

Determination of Iodate in Food, Environmental, and Biological Samples after Solid-Phase Extraction with Ni-Al-Zr Ternary Layered Double Hydroxide as a Nanosorbent

Hydrotalcite Formation for Contaminant Removal from Ranger Mine Process Water

Evaluation of Layered Double Hydroxide Synthesised from a Green Biogenic Precursor for Phosphate Removal: Characterisations and Isotherms

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