Preparation of montmorillonite clays containing DTMPPA for Zinc extraction

Bouazza, Djamila; Miloudi, Hafida; Sassi, Mohamed; Boos, Anne; Goetz, G.; Tayeb, Abdelkader; Bengueddach, Abdelkader

doi:10.1016/j.jpcs.2006.01.022

Cited by 6 publications

(8 citation statements)

References 14 publications

(14 reference statements)

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“…The temperature range and weight loss values are consistent with what has been observed in similar systems; for example, a 10% weight loss has been found for di(2,4,4-trimethylpentyl)phosphinic acid sorbed within clay. 53 A longer reaction time thus allows more HEDP incorporation than a higher temperature. This is consistent with the P-elemental results, wherein mHAP6A had 52.1% HEDP compared to mHAP5B with 32.6%.…”

Section: Resultsmentioning

confidence: 99%

Modification of Hydroxyapatite with Ion-Selective Complexants: 1-Hydroxyethane-1,1-diphosphonic Acid

Daniels

Lyczko

Nzihou

et al. 2015

Ind. Eng. Chem. Res.

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Hydroxyapatite (HAP) was modified with 1-hydroxyethane-1,1-diphosphonic acid (HEDP), and its effect on divalent metal ion binding was determined. HAP was synthesized from calcium hydroxide and phosphoric acid. After calcination, it was modified with HEDP, and the influence of time and temperature on the modification was investigated. HEDP incorporation increased as its initial solution concentration increased from 0.01 to 0.50 M. Unmodified and modified HAP were characterized using Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, and specific surface area analysis. Ca/P ratios, acid capacities, and phosphorus elemental analyses gave the effect of modification on composition and surface characteristics. A high reaction temperature produced new phosphonate bands at 993, 1082, and 1144 cm–1 that indicated the presence of HEDP. HAP modification at a high temperature–long reaction time had the highest HEDP loading and gave the sharpest XRD peaks. The emergence of new HAP–HEDP strands was observed in SEM images for treated samples while EDS showed high phosphorus contents in these strands. Modified HAP had a high acid capacity from the additional P–OH groups in HEDP. The P(O)OH groups maintain their ability to bind metal ions within the HAP matrix: contacting the modified HAP with 10–4 N nitrate solutions of five transition metal ions gives an affinity sequence of Pb(II) > Cd(II) > Zn(II) > Ni(II) > Cu(II). This result is comparable to that of commercially available di(2-ethylhexyl)phosphoric acid, a common solvent extractant, and the trend is consistent with the Misono softness parameter of metal ion polarizabilities.

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Section: Resultsmentioning

confidence: 99%

Modification of Hydroxyapatite with Ion-Selective Complexants: 1-Hydroxyethane-1,1-diphosphonic Acid

Daniels

Lyczko

Nzihou

et al. 2015

Ind. Eng. Chem. Res.

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“…The cyanex 272 impregnated LDH was prepared in accordance with the dry impregnation method [31,32]. Cyanex 272 was dissolved in ethanol, and then the solution was left in contact with the LDH material under magnetic stirring at room temperature until total evaporation of ethanol.…”

Section: Preparation Of Impregnated Sorbentsmentioning

confidence: 99%

Removal of Zinc from Aqueous Solutions Using Lamellar Double Hydroxide Materials Impregnated with Cyanex 272: Characterization and Sorption Studies

et al. 2020

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Removal of heavy metals from wastewater is mandatory in order to avoid water pollution of natural reservoirs. In the present study, layered double hydroxide (LDH) materials were evaluated for removal of zinc from aqueous solutions. Materials thus prepared were impregnated with cyanex 272 using the dry method. These materials were characterized through X-ray diffraction (XRD), Fourier transform infrared (FTIR), and thermal analysis. Batch shaking adsorption experiments were performed in order to examine contact time and extraction capacity in the removal process. Results showed that the equilibrium time of Zn (II) extraction is about 4 h for Mg2Al-CO3 and Mg2Al-CO3-cyanex 272, 6 h for Zn2Al-CO3, and 24 h for Zn2Al-CO3-cyanex 272. The experimental equilibrium data were tested for Langmuir, and Freundlich isotherm models. Correlation coefficients indicate that experimental results are in a good agreement with Langmuir’s model for zinc ions. Pseudo-first, second-order, Elovich, and intraparticular kinetic models were used to describe kinetic data. It was determined that removal of Zn2+ was well-fitted by a second-order reaction kinetic. A maximum capacity of 280 mg/g was obtained by Zn2Al-CO3-cyanex 272.

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“…It appears that if the acylpyrazolones such as HTMDDP are efficient to extract copper in the clay, the organophosphorus acids such as DTMPPA are not. However, previous studies showed that immobilized DTMPPA is efficient for zinc extraction whatever the nature of the solid ( Levextrel or Amberlite XAD-2 resins [44][45][46] , sol-gel 47 or mesoporous silica 48 , clays 20 , and the extraction method 49 . Thus, the present DTMPPA impregnated solid may be envisaged for continuous separation of zinc and copper from their dilute sulfate solutions.…”

Section: Effect Of Equilibrium Phmentioning

confidence: 99%

“…Consequently, the homoionic clay obtained was washed thoroughly with distilled water to remove excess NaCl, dried at 80 °C for 24 h and ground to pass 63 µm mesh sieve. DTMPPA and HTMDDP were introduced into the solid clay supports by means of the dry impregnation method already successfully used 20 . An appropriate amount of homoionic clay (1g) was mixed with 10 mL of an ethanolic solution containing 1 mmol (0.29 g) of DTMPPA, or with 10 mL of a toluene solution containing 1mmol (0,358 g) of HTMDDP.…”

Section: Preparation Of Impregnated Sorbentsmentioning

confidence: 99%

“…Surface modification of the latter was shown to be an important feature for developing their practical applications such as fillers and adsorbents. This was obtained by means of intercalation reactions through interlamellar grafting of organic molecules [16][17][18][19][20][21][22][23][24][25][26] . Although organophosphorous and pyrazolone chelating extractants are often used in the liquid-solid extraction process of metals 11,[17][18][27][28][29][30][31][32][33][34][35][36][37][38] , any investigation concerning clays functionalized by pyrazolones is not described in the literature.…”

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confidence: 99%

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