Adsorption of boron on calcined AlMg layered double hydroxide from aqueous solutions. Mechanism and effect of operating conditions

Isaacs-Páez, Elizabeth Diane; Leyva‐Ramos, Roberto; Jacobo‐Azuara, Araceli; Martínez-Rosales, J. Merced; Flores-Cano, J.V.

doi:10.1016/j.cej.2014.02.031

Cited by 53 publications

(23 citation statements)

References 35 publications

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“…[23][24][25] So far, a number of studies have reported that the calcined LDHs exhibit improved retention to pollutants. [25][26][27][28] For example, the boron adsorption capacity of Al/Mg LDH aer being calcined at 550 C was enhanced by 18.5 times, as compared with that of the LDH without calcination treatment. 28 Aer thermal treatment at 500 C, Co/Al LDH samples were converted to mesoporous products, consisting of CoAl 2 O 4 or its mixture with Co 3 O 4 .…”

Section: Introductionmentioning

confidence: 99%

“…[25][26][27][28] For example, the boron adsorption capacity of Al/Mg LDH aer being calcined at 550 C was enhanced by 18.5 times, as compared with that of the LDH without calcination treatment. 28 Aer thermal treatment at 500 C, Co/Al LDH samples were converted to mesoporous products, consisting of CoAl 2 O 4 or its mixture with Co 3 O 4 . The calcined product exhibited a much higher capacity of uoride removal compared to that of the uncalcined LDH, due to the high surface area and porous structure.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption removal of Congo red over flower-like porous microspheres derived from Ni/Al layered double hydroxide

Huang

2015

RSC Adv.

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In this paper, flower-like microspheres of Ni/Al mixed oxide (Ni/Al-CLDH-H), which consist of a hollow core and mesoporous shell, were prepared with the aid of sulfonated polystyrene beads. Thanks to the unique structure, the adsorption performance of the sample toward Congo red (CR) was higher than that of the sample Ni/Al-CLDH-S consisting of a solid core and mesoporous shell, which was prepared in the absence of sulfonated polystyrene beads. The Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Redlich-Peterson and Sips isotherm models were utilized to describe the adsorption process of Ni/Al-CLDH-H; the Sips model was found to best fit the adsorption data. The adsorption kinetics of CR onto Ni/Al-CLDH-H followed the pseudo-second-order model best, compared with the use of the pseudofirst-order and Elovich models. The thermodynamic study showed that the adsorption process was endothermic and spontaneous in nature. Our newly developed material retained a superior adsorption capacity without a significant loss after a number of adsorption-desorption cycles; indicating its potential as a reusable adsorbent for efficient removal of CR in water.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adsorption removal of Congo red over flower-like porous microspheres derived from Ni/Al layered double hydroxide

Huang

2015

RSC Adv.

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“…Several studies have opined that anions are adsorbed on LDHs by either anion exchange with the hydroxyl anions in the water solution, electrostatic interaction and/or formation of complex (outersphere / inner sphere) [14,22]. SEM analysis revealed a change in the surface architecture of the spent LDH sample after phosphate sorption (Figure 17).…”

Section: Characterisation Of Phosphate -Laden Ldhmentioning

confidence: 99%

“…The bending vibration of the interlayer water H-OH was found at 1631 cm -1 . The bands at 1413 cm -1 , 1116 cm -1 , and 617 cm -1 were attributed to CO 3 2-, due to asymmetric stretching, symmetric stretching and bending modes, respectively [3,[13][14]. The weak band around 750-800 cm -1 was attributed to M-O-M vibration in the brucite-like layer while the bands around 480-500 cm -1 corresponded to M-OH stretching and bending vibrations.…”

Section: Characterisation Of Synthesised Ldh Samplesmentioning

confidence: 99%

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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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Instant One‐Pot Preparation of Functional Layered Double Hydroxides (LDHs) via a Continuous Hydrothermal Approach

et al. 2017

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International audienceInstant one-pot synthesis of functional layered double hydroxides (LDHs) is demonstrated for the first time using a continuous hydrothermal multi-step process. The as-prepared pristine material displays high crystallinity and very small LDH nanoparticle size, lateral dimensions below 100 nm and a thickness below 20 nm, all being achieved in only 5 s. This approach was extended to the preparation of i) pristine LDH with different compositions by varying the cation (Mg, Ni, or Zn) and the anion (CO3, NO3) and ii) functional LDH by varying the functionalization agent, for example long organic molecules (hybrid LDH), enzymes (bio-hybrid LDH) or inorganic metal/oxide nanocrystals (inorganic-LDH). Beyond the design of functional LDH, this paper presents proof of concept for a continuous, one-pot and multistep high temperature/high pressure (HT/HP) process for the assembly of nanoscaled materials

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Adsorption of boron on calcined AlMg layered double hydroxide from aqueous solutions. Mechanism and effect of operating conditions

Cited by 53 publications

References 35 publications

Adsorption removal of Congo red over flower-like porous microspheres derived from Ni/Al layered double hydroxide

Adsorption removal of Congo red over flower-like porous microspheres derived from Ni/Al layered double hydroxide

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

Instant One‐Pot Preparation of Functional Layered Double Hydroxides (LDHs) via a Continuous Hydrothermal Approach

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