The Use of Hydrotalcite as an Anion Absorbent

Parker, L.M.; Milestone, Neil B.; Newman, Roger H.

doi:10.1021/ie00043a023

Cited by 193 publications

(114 citation statements)

References 5 publications

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“…The sorption capacity of this new anionic clay is very favorably compared to other reported conventional HT clay behaviors such as those reported by Parker et al that report a ~3 meq/g HT sorption capacity when prepared in carbonate-free solutions, as well as a near-total sorption of sulfates present in the materials being treated. [32] As seen in Table 2, the anionic and cationic sorption exceeds the values reported by Parker et al Currently, the only commercially-viable method for removing sulfates from groundwater is via reverse osmosis. [33] This series of tests shows great promise for a green method of sulfate removal that has yet to be adequately implemented on an industrial scale.…”

Section: Comentioning

confidence: 86%

Green Cycle: Sulfate Sorption from Natural Water on Anionic Clay Compound Obtained from Industry Wastewater

Rosano-Ortega¹,

Lebrún²,

Oglesby³

et al. 2013

GSC

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In this paper we are describing a green cycle process. The first step was a novel hydrotalcite-like compound (HTLC) synthesized by a co-precipitating method, under standard ambient temperature and pressure, using chemical industry wastewater rich in divalent and trivalent cations, activated by a thermal treatment and finally characterized by scanning electron microscopy (SEM), energy dispersive X-ray fluorescence (EDS) and thermogravimetric analysis (TGA). The second step was a series of batch sorption tests performed with this activated HTLC and untreated underground sulfurous water from the state of Puebla, México. The HTLC calcined at 500˚C/3 h exhibited the best sorption ability for ions, demonstrated a decrease of the hardness and sulfate ions to below the regional legal standards for drinking water. Once inactive after being used in water treatment, the sorbed ions were removed by ion exchange in a carbonate-containing solution, resulting in an 80% recycling of the material which upon activation demonstrated a retained capacity for water treatment. This recyclability suggests the exciting possibility of this novel compound as an efficient "green" technology in water treatment processes.

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Section: Comentioning

confidence: 86%

Green Cycle: Sulfate Sorption from Natural Water on Anionic Clay Compound Obtained from Industry Wastewater

Rosano-Ortega¹,

Lebrún²,

Oglesby³

et al. 2013

GSC

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“…However, care should be taken when using these data. For example, Parker et al 63 found anion absorption selectivities for MgAl mixed oxides of: SO 4 2-> F -> Cl -> NO 3 -and the anion selectivities predicted by Table 3 are: F -> SO 4 2-> NO 3 -> Cl -. Although, these predictions contradict the experimental results, these differences may be explained on the basis of the CO 3 2-impurities present in the aqueous solution 63 and the oxide adsorption capacities 100 , factors not taken into account in the thermodynamic calculations.…”

Section: Synthesis Of Ldhs By Hydrothermal Reconstruction Methodsmentioning

confidence: 99%

“…There is currently an increasing interest in LDHs, due to their properties as catalysts and catalyst supports 9,12,54 , antacids 9,[55][56] , trapping agents for anionic contaminants [57][58][59][60] , flame retardants 9,61 , polymer stabilizers 9,62 , molecular sieves 5 , ion exchangers and adsorbents 63,64 . New areas have been investigated for applications in the field of medicine 65,66 , thin films 67 , conducting materials 68,69 , electrodes [70][71][72] and corrosion protection [73][74][75] .…”

Section: Introductionmentioning

confidence: 99%

Review of the synthesis of layered double hydroxides: a thermodynamic approach

Bravo-Suárez¹,

Páez‐Mozo²,

Oyama³

2004

Quím. Nova

124

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Recebido em 29/4/03; aceito em 3/11/03; publicado na web em 27/05/04The synthesis of layered double hydroxides (LDHs) by hydrothermal-LDH reconstruction and coprecipitation methods is reviewed using a thermodynamic approach. A mixture model was used for the estimation of the thermodynamics of formation of LDHs. The synthesis and solubility of LDHs are discussed in terms of standard molar Gibbs free energy change of reaction. Data for numerous divalent and trivalent metals as well as for some monovalent and tetravalent metals that may be part of the LDH structure have been compiled. Good agreement is found between theoretical and experimental data. Diagrams and tables for the prediction of possible new LDH materials are provided.

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“…Hydrotalcites containing one of the anions 2-ethylhexanoate, carbonate, oxalate, malonate, succinate, octanedicarboxylate, benzoate, phthalate, terephthalate, or trimesate with magnesium to aluminum ratios of approximately 3:1 were synthesized by coprecipitation according to the synthesis by Kooli et al [9] Due to an increasing incorporation tendency in the order NO 3 À < Cl À < SO 4 2À < CO 3 2À , [18] nitrate salts were used as counter anions in the metal salts to minimize the incorporation of the counter anion instead of the desired organic anion. Because of the high tendency of carbon dioxide incorporation from air, resulting in carbonate formation, [2] nitrogen was blown into the reaction mixture to avoid this effect.…”

Section: Resultsmentioning

confidence: 99%

Impact of Organic Interlayer Anions in Hydrotalcite Precursor on the Catalytic Activity of Hydrotalcite‐Derived Mixed Oxides

Meyer¹,

Roessner²,

Rakoczy³

et al. 2010

ChemCatChem

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A series of hydrotalcite‐derived mixed oxides containing different organic interlayer anions in the hydrotalcite precursors have been synthesized and studied as catalysts in the transesterification of glycerol trioctanoate with methanol. There are significant differences in the catalytic activity of these mixed oxides, indicating a great impact of interlayer anions in hydrotalcite precursors. Generally, anions with high charge density and, therefore, high content within the interlayer of the hydrotalcites lead to higher catalytic activity in the derived mixed oxides in contrast to anions with low charge density. An influence of interlayer anions on the structural properties of the hydrotalcites, such as interlayer distance, which is determined by X‐ray diffraction analysis, and on the surface area and pore volume of the corresponding mixed oxides, which are determined by nitrogen adsorption, is obtained. Furthermore, interlayer anions had a significant effect on the thermal stability of the hydrotalcite structure as well as on the pore size distribution of derived mixed oxides.

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The Use of Hydrotalcite as an Anion Absorbent

Cited by 193 publications

References 5 publications

Green Cycle: Sulfate Sorption from Natural Water on Anionic Clay Compound Obtained from Industry Wastewater

Green Cycle: Sulfate Sorption from Natural Water on Anionic Clay Compound Obtained from Industry Wastewater

Review of the synthesis of layered double hydroxides: a thermodynamic approach

Impact of Organic Interlayer Anions in Hydrotalcite Precursor on the Catalytic Activity of Hydrotalcite‐Derived Mixed Oxides

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