High sorption of phosphate on Mg-Al layered double hydroxides: Kinetics and equilibrium

Luengo, Carina Vanesa; Volpe, María Alicia; Avena, Marcelo Javier

doi:10.1016/j.jece.2017.08.051

Cited by 86 publications

(41 citation statements)

References 60 publications

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“…In our case, the high effluent pH and absence of breakthrough for P as was seen for Se and S suggested a different removal mechanism. This was also corroborated by the absence of the characteristic P-O asymmetric stretching at around 1098 cm −1 that is an indicator of phosphate adsorption on LDH [80,81] in the post-mortem FTIR data (Figure 9). It should be noted that the use of chemical precipitation (i.e., addition of calcium salts to an alkalinized solution of phosphate) is a developed technique for P recovery from wastewater, with a precipitation efficiency of 82.7% at pH 11 reported using a Ca/P ratio of 1.5 [96].…”

Section: Removal Of Other Species From the Watersupporting

confidence: 53%

“…Hence, making definitive identification of bands in this region is difficult when considering the complex water matrix. On the other hand, the characteristic sharp bands indicating adsorption of nitrate (around 1380-1385 cm −1 ) [74,77] and phosphate (around 1098 cm −1 ) [80,81] were not observed. The FTIR spectrum for the LDH that had been used in the small-scale (1.1 cm) column test for treating CT blowdown (Figure 9b, red trace) had some notable differences compared to the one for the LDH formed after reconstruction of the as-obtained granules in purged DI water.…”

Section: Infrared Analysis Of Ldhmentioning

confidence: 96%

“…When the as-obtained granules are exposed to slightly acidic DI water for rehydration, Mg and Al ions can dissolve into solution. The dissolution of LDH materials in acidic conditions is well known (total dissolution of LDH is possible < pH 4 [81,82,102]) and has been exploited as a means to deliver pharmaceuticals [103,104]. However, stability studies show that Mg and Al leaching from LDH is minimal at high pH due to the precipitation of Mg(OH) 2 and Al(OH) 3 [82,83].…”

Section: Stability Of Ldhmentioning

confidence: 99%

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Layered Double Hydroxide Sorbents for Removal of Selenium from Power Plant Wastewaters

Chowdhury

Kraetz

et al. 2019

ChemEngineering

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Selenium is an essential trace element but is increasingly becoming a contaminant of concern in the electric power industry due to the challenges of removing solubilized selenate anions, particularly in the presence of sulfate. In this work, we evaluate granulated layered double hydroxide (LDH) materials as sorbents for selenium removal from wastewaters obtained from a natural gas power plant with the aim to elucidate the effect of competing ions on the sorption capacities for selenium removal. We first present jar test data, followed by small-scale column testing in 0.43 inch (1.1 cm) and 2 inch (5.08 cm) diameter testbed columns for the treatment of as-obtained cooling tower blowdown waters and plant wastewaters. Finally, we present field results from a pilot-scale study evaluating the LDH media for treatment of cooling tower blowdown water. We find that despite the high levels of total dissolved solids and competing sulfate ions, the selenium oxoanions and other regulated metals such as chromium and arsenic are successfully removed using LDH media without needing any pre-treatment or pH adjustment of the wastewater.

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Section: Removal Of Other Species From the Watersupporting

confidence: 53%

Section: Infrared Analysis Of Ldhmentioning

confidence: 96%

Section: Stability Of Ldhmentioning

confidence: 99%

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Layered Double Hydroxide Sorbents for Removal of Selenium from Power Plant Wastewaters

Chowdhury

Kraetz

et al. 2019

ChemEngineering

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“…Phosphate had a high electronegativity and a strong hydrogen bond, and these properties effectively lowered the interlayer space of LDHs through the orientation tilt of phosphate ions [46]. [38,49].…”

Section: Influence Of Different M 3+ On Phosphate Removal By Mg-m 3+ mentioning

confidence: 99%

Influence of various experimental parameters on the capacitive removal of phosphate from aqueous solutions using LDHs/AC composite electrodes

Zhou

Hong

et al. 2019

Separation and Purification Technology

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The efficient uptake of phosphate from aqueous solutions was achieved on layered double hydroxides (LDHs)-based electrodes via capacitive desalination in our previous study. The current follow-up work was mainly carried out to study the influence of various experimental parameters on the capacitive removal of phosphate using LDHs/activated carbon (LDHs/AC) composite electrodes. A series of batch experiments were implemented to investigate the experimental factors, including Mg 2+ /Al 3+ ratios (2, 3, and 4), trivalent metal cations (Al 3+ , Fe 3+ , Cr 3+), initial solution pH (from 3 to 10), coexisting anions (NO 3-, Cl-, SO 4 2-), and ion strengths, in capacitive deionization. The electrode materials before and after capacitive deionization were characterized to reinforce the analysis of the adsorption mechanisms by X-ray powder diffraction, scanning electron microscopy, energy dispersive X-ray, cyclic voltammetry, and electrochemical impedance spectroscopy. Results indicated that the Mg-Al LDHs/AC electrodes exhibited higher phosphate adsorption capacity (80.43 mg PO 4 3-/g), more regular morphology, and higher degree of crystallinity than that of Mg-Fe LDHs/AC and Mg-Cr LDHs/AC. Increasing Mg 2+ /Al 3+ ratios enhanced the adsorption capacity of phosphate. The uptake of phosphate by Mg-Al LDHs/AC under circumneutral pH and low ion strength reached the maximum level. Furthermore, the presence of coexisting anions lowered the adsorption capacity of phosphate mainly due to the occurrence of a compressed electrical double layer. Therefore, the influence of different experimental parameters on phosphate removal via capacitive deionization by Mg-Al LDHs/AC necessitates a 3 systematic investigation to optimize the preparation conditions of LDHs-based electrodes and several important operating parameters.

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“…Several materials, such as Al, Fe, and Ca salts, biochar, Phoslock, and modified clays, have already been studied for P recovery and remediation of eutrophic aquatic ecosystems (Cooke et al 1993;Yamada-Ferraz et al 2015;Grochowska et al 2017;Liu et al 2017;Luengo et al 2017;Lwin et al 2017;Rydin et al 2017;Lan et al 2018;Mucci et al 2018;Lurling and Marinho 2019;Zheng et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Remediation of Eutrophic Aquatic Ecosystems: Evaluation of Phosphorus Adsorption by Sawdust

Pantano

Souza

Pereira-Filho

et al. 2019

Integr Envir Assess & Manag

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A wide range of anthropogenic activities have caused various problems to the aquatic environment, leading to economic, social, and environmental losses. The use of materials for the recovery of water quality is very important due to the water scarcity scenario present in different parts of the world. The use of sawdust as an organic adsorbent for P removal in eutrophic environments attempts to address both water quality preservation and possible application of the organic adsorbent as fertilizer for agricultural practices. This use will result in important contributions to the water and food security. In this work, we performed laboratory experiments to study P adsorption and to evaluate possible adsorption of metals and emerging contaminants by sawdust. The experiments were carried out in 36 microcosms (glass jars), using 50% of the flasks as treatments (containing bags with sawdust) and the rest of the flasks as control (water and sediment without sawdust). For future application of sawdust as a fertilizer it is important to be aware of the presence of possible pathogenic microorganisms, thus the presence of helminth eggs was determined in the sawdust. The results showed the tendency of P adsorption by the biosorbent; maximum adsorption occurred at 214 d (41 μg P g–1), after the P desorption occurred. No helminth eggs or emerging contaminants and toxic metal were detected in the sawdust after its use as biosorbent, providing an important subsidy regarding the use of the biosorbent as soil fertilizer. Integr Environ Assess Manag 2019;00:1–12. © 2019 SETAC

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High sorption of phosphate on Mg-Al layered double hydroxides: Kinetics and equilibrium

Cited by 86 publications

References 60 publications

Layered Double Hydroxide Sorbents for Removal of Selenium from Power Plant Wastewaters

Layered Double Hydroxide Sorbents for Removal of Selenium from Power Plant Wastewaters

Influence of various experimental parameters on the capacitive removal of phosphate from aqueous solutions using LDHs/AC composite electrodes

Remediation of Eutrophic Aquatic Ecosystems: Evaluation of Phosphorus Adsorption by Sawdust

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