Synthesis of novel CO 3 2− /Cl − -bearing 3(Mg + Zn)/(Al + Fe) layered double hydroxides for the removal of anionic hazards

Abou‐El‐Sherbini, Khaled S.; Kenawy, Ibrahim M.; Hafez, M. A. H.; Lotfy, Hesham R.; AbdElbary, Zaynab M.E.A.

doi:10.1016/j.jece.2015.09.015

Cited by 17 publications

(10 citation statements)

References 56 publications

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“…Table 3 shows negative values of ∆G˚ suggesting a favourable adsorption process of Cu 2+ by GD and GND powders, also reported by Sherbinia et al [35].…”

Section: Thermodynamic Datasupporting

confidence: 79%

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Modeling of Copper Adsorption by <i>Moringa oleifera</i> Seed Powders

Yehe¹,

Odoh²,

Allou³

et al. 2021

OJPC

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In this work, an inexpensive and environmentally friendly natural adsorbent obtained from shelled (GD) and unshelled (GND) Moringa oleifera seeds was used for copper adsorption from aqueous solutions. A series of experiments were performed to assess the parameters influencing the adsorption phenomenon such as pH, adsorbent mass, adsorption equilibrium time and temperature. The kinetic results of adsorption described a pseudo-second order model. The adsorption isotherms are satisfactorily described by the Langmuir mathematical model. The thermodynamic data revealed a spontaneous and endothermic adsorption phenomenon. The level of copper in surface water before and after addition of moringa powders was carried out to verify the effectiveness of the adsorbent. A maximum adsorption rate of 51.28% and 61.96% was obtained with GD and GND powders respectively. Moringa oleifera seed powders are an effective alternative for the removal of copper from surface water.

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“…Table 3 shows negative values of ∆G˚ suggesting a favourable adsorption process of Cu 2+ by GD and GND powders, also reported by Sherbinia et al [35].…”

Section: Thermodynamic Datasupporting

confidence: 79%

“…The adsorption kinetics experiments were carried out under optimal experimental conditions. 50 mL of copper solutions at various concentrations (10,25,35,45 and 50 mg•L −1 ) were analyzed at different contact times (5, 10, 20, 30, 40 and 60 min). Stirring of the mixture was performed at 500 rpm for 3 minutes.…”

Section: Kinetic Studiesmentioning

confidence: 99%

Modeling of Copper Adsorption by <i>Moringa oleifera</i> Seed Powders

Yehe¹,

Odoh²,

Allou³

et al. 2021

OJPC

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“…The co-precipitation procedure and characterization of LDH21 and LDH22 were previously described [18]. To get LDH21 or LDH22, a solution of Mg(II), Zn(II), Al(III) and Fe(III) chlorides with initial metal molar ratios of 2.4:0.6:0.9:0.1 or 2.4:0.6:0.8:0.2, respectively, was prepared.…”

Section: Synthesis Of the Adsorbentsmentioning

confidence: 99%

“…Recently, the synthesis of a series of LDH and CLDH compositions of (Mg,Zn)/(Al,Fe)-(CO 3 ,Cl) with magnetic properties was reported which gave promising adsorption capacities for anionic hazards attributed to stabilizing structure by isostructural substitution of approximately 20% of Mg and Al with Zn and Fe, respectively [18]. Their adsorption behavior of LDHs and CLDHs coded LDH21, LDH22, CLDH21 and CLDH22 towards IDB dye has not previously been detailed.…”

Section: Introductionmentioning

confidence: 99%

Removal of Isolan Dark Blue 2SGL-01 from aqueous solutions onto calcined and uncalcined (Mg-Zn)/(Al-Fe)-(CO3)/Cl layered double hydroxides

Kenawy

Hafez

Mousa

et al. 2021

Sustain Environ Res

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The adsorption process of the industrialized dye Isolan Dark Blue 2SGL-01 (IDB) onto (Mg-Zn)/(Al-Fe)-(CO3)/Cl layered double hydroxides (LDHs) coded LDH21 and LDH22 and its calcined products CLDHs (CLDH21 and CLDH22), respectively, was investigated. The characterization of LDHs and CLDHs before and after loading with IDB by Fourier transform infrared, scanning electron microscope and surface area measurements showed a typical hydrotalcite structure and confirmed the loading of IDB. The adsorption parameters; initial pH, shaking time, adsorbent dose, initial concentration of IDB dye and temperature were studied. The optimum conditions for IDB adsorption were pH 4.3 and shaking time 3 h. A complete removal of IDB (> 99%) was achieved using a dosage of 2.0 g L− 1 CLDHs or LDH22, and 3.0 g L− 1 of LDH21. The adsorption processes were suggested to be best described by the pseudo-second order kinetics and Langmuir-type adsorption isotherm with monolayer capacities of 75, 91, 427 and 530 mg g− 1, onto LDH21, LDH22, CLDH21 and CLDH22, respectively. The loaded IDB was recovered from LDHs and CLDHs adsorbent using Na2CO3. CLDH22 showed best adsorption capacity of 530 mg g− 1. Its adsorption thermodynamic parameters ∆Gadsorption, ∆Hadsorption and ∆Sadsorption indicated that the adsorption processes were spontaneous and endothermic in nature. CLDH22 was successfully applied for the removal of IDB from simulated dyeing process with removal efficiency 97%.

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“…The Mg 2+ and Zn 2+ ions, which are bound to the HT layer, can undergo exchanges due to the similar atomic radius difference. The dimensions of the Mg 2+ , Zn 2+ , and Al 3+ radii are 0.72 Å, 0.74 Å and 0.54 Å, respectively [5,35]. According to Cavani et al, 1991 [1], divalent metal cations with radii between 0.3-0.9 Å and trivalent metal cations with radii of 0.5-0.8 Å will form a more regular octahedral coordination with the hydroxyl groups.…”

Section: The Effect Of Ph Solutionmentioning

confidence: 99%

FABRICATION OF Mg-Zn-Al HYDROTALCITE AND ITS APPLICATION FOR Pb2+ REMOVAL

et al. 2019

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The fabrication of Mg-Zn-Al Hydrotalcite (HT) was carried out by the co-precipitation method at various molar ratios. The Mg-Zn-Al HT compound at the optimum molar ratio was then calcined to determine the effect of calcination on the Pb 2+ adsorption. The kinetics of the adsorption type was determined by applying pseudo first order and pseudo second order kinetics models. Meanwhile, to investigate the adsorption process, the Freundlich and Langmuir equations were applied to determine the adsorption isotherm. The results showed that the optimum Mg-Zn-Al HT was at a molar ratio of 3 : 1 : 1 with an adsorption efficiency of 73.16 %, while Mg-Zn-Al HT oxide increased the adsorption efficiency to 98.12 %. The optimum condition of Pb 2+ removal using Mg-Zn-Al HT oxide was reached at pH 5 and a contact time of 30 minutes. The adsorption kinetics follows the pseudo second order kinetics model with a rate constant of 0.544 g/mg·min. The isotherm adsorption follows the Langmuir isotherm model with a maximum capacity of 3.916 mg/g and adsorption energy of 28.756 kJ/mol.

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Synthesis of novel CO 3 2− /Cl − -bearing 3(Mg + Zn)/(Al + Fe) layered double hydroxides for the removal of anionic hazards

Cited by 17 publications

References 56 publications

Modeling of Copper Adsorption by <i>Moringa oleifera</i> Seed Powders

Modeling of Copper Adsorption by <i>Moringa oleifera</i> Seed Powders

Removal of Isolan Dark Blue 2SGL-01 from aqueous solutions onto calcined and uncalcined (Mg-Zn)/(Al-Fe)-(CO3)/Cl layered double hydroxides

FABRICATION OF Mg-Zn-Al HYDROTALCITE AND ITS APPLICATION FOR Pb2+ REMOVAL

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Synthesis of novel CO 3 2− /Cl − -bearing 3(Mg + Zn)/(Al + Fe) layered double hydroxides for the removal of anionic hazards

Cited by 17 publications

References 56 publications

Modeling of Copper Adsorption by &lt;i&gt;Moringa oleifera&lt;/i&gt; Seed Powders

Modeling of Copper Adsorption by &lt;i&gt;Moringa oleifera&lt;/i&gt; Seed Powders

Removal of Isolan Dark Blue 2SGL-01 from aqueous solutions onto calcined and uncalcined (Mg-Zn)/(Al-Fe)-(CO3)/Cl layered double hydroxides

FABRICATION OF Mg-Zn-Al HYDROTALCITE AND ITS APPLICATION FOR Pb2+ REMOVAL

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Modeling of Copper Adsorption by <i>Moringa oleifera</i> Seed Powders

Modeling of Copper Adsorption by <i>Moringa oleifera</i> Seed Powders