Kinetics and thermodynamics of Mn(II) removal from aqueous solutions onto Mg-Zn-Al LDH/montmorillonite nanocomposite

Bakr, A.A.; Sayed, Nahla A.A. El; Salama, Tarek M.; Ali, Ibrahim O.; Gayed, R. R. Abdel; Negm, Nabel A.

doi:10.1016/j.ejpe.2018.05.003

Cited by 21 publications

(18 citation statements)

References 44 publications

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“…All experiments were made at pH = 7 (pH-meter JK-PH009, JKI, Shanghai, China, 0-14 pH). The Mn 2+ removal percentage (R%) was calculated using Equation 1 [22,23]:…”

Section: Adsorption Study Of Mn 2+ Used Ldhsmentioning

confidence: 99%

“…Langmuir [22,24] and Freundlich [25,26] models are most commonly models used especially for adsorption processes in water or wastewater treatment.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

“…The Freundlich adsorption isotherm was used in case of heterogeneous adsorbent. In literature [25,26], the isotherm interprets that the ratio of the ion amounts adsorbed on a known mass of adsorbent to the ion concentration in the solution differs at different concentrations [22,27]. The Freundlich model starts from the hypothesis of reaching the chemical equilibrium when there is a dynamic exchange between the molecules of the adsorbed phase and those remaining in solution [25,27].…”

Section: Adsorption Isothermsmentioning

confidence: 99%

“…The results indicated that the maximum adsorption efficiency were 24.5, 26.4 and 28.9 mg/g at adsorbent mass of 0.25 g/L, initial Mn(II) concentration of 80 mg/L, pH of 6.0, stirring rate of 160 rpm, contact time of 75 min and temperatures 298, 308 and 318 K. The obtained results indicated that increasing the temperature of the adsorption process increases the adsorption capacity due to the acceleration of some original slow adsorption steps. This could be due to the new adsorption active sites that are created on the adsorbent surface or to the increases of the solubility of the Mn(II) ions in the medium [22,23].…”

Section: Adsorption Isotherm Evaluationmentioning

confidence: 99%

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Mixed Oxide Layered Double Hydroxide Materials: Synthesis, Characterization and Efficient Application for Mn2+ Removal from Synthetic Wastewater

et al. 2020

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Magnesium–aluminum (Mg-Al) and magnesium–aluminum–nickel (Mg-Al-Ni) layered double hydroxides (LDHs) were synthesized by the co-precipitation method. The adsorption process of Mn2+ from synthetic wastewater was investigated. Formation of the layered double hydroxides and adsorption of Mn2+ on both Mg-Al and Mg-Ni-Al LDHs were observed by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectrometry (EDX) analysis. XRD patterns for prepared LDHs presented sharp and symmetrical peaks. SEM studies revealed that Mg-Al LDH and Mg-Al-Ni LDH exhibit a non-porous structure. EDX analysis showed that the prepared LDHs present uniformly spread elements. The adsorption equilibrium on these LDHs was investigated at different experimental conditions such as: Shaking time, initial Mn2+ concentration, and temperatures (10 and 20 °C). The parameters were controlled and optimized to remove the Mn2+ from synthetic wastewater. Adsorption isotherms of Mn2+ were fitted by Langmuir and Freundlich models. The obtained results indicated that the isotherm data fitted better into the Freundlich model than the Langmuir model. Adsorption capacity of Mn2+ gradually increased with temperature. The Langmuir constant (KL) value of Mg-Al LDH (0.9529 ± 0.007 L/mg) was higher than Mg-Al-Ni LDH (0.1819 ± 0.004 L/mg), at 20 °C. The final adsorption capacity was higher for Mg-Al LDH (91.85 ± 0.087%) in comparison with Mg-Al-Ni LDH (35.97 ± 0.093%), at 20 °C. It was found that the adsorption kinetics is best described by the pseudo-second-order model. The results indicated that LDHs can be considered as a potential material for adsorption of other metallic ions from wastewater.

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“…All experiments were made at pH = 7 (pH-meter JK-PH009, JKI, Shanghai, China, 0-14 pH). The Mn 2+ removal percentage (R%) was calculated using Equation 1 [22,23]:…”

Section: Adsorption Study Of Mn 2+ Used Ldhsmentioning

confidence: 99%

“…Langmuir [22,24] and Freundlich [25,26] models are most commonly models used especially for adsorption processes in water or wastewater treatment.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Section: Adsorption Isothermsmentioning

confidence: 99%

Section: Adsorption Isotherm Evaluationmentioning

confidence: 99%

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Mixed Oxide Layered Double Hydroxide Materials: Synthesis, Characterization and Efficient Application for Mn2+ Removal from Synthetic Wastewater

et al. 2020

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“…The chemisorption mechanism involved formation of chemical bonds between the adsorbents function groups and the metal ions. 41,42 The adsorption isotherm is shown in Fig. 4 and the relative parameters calculated from the two models are listed in Table 2.…”

Section: Cd(ii) Removal By Ldh-go@fe(ii) Compositesmentioning

confidence: 99%

Cd(ii) removal by Fe(ii) surface chemically modified layered double hydroxide–graphene oxide: performance and mechanism

Liao

Wang

et al. 2019

RSC Adv.

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Removal of Sodium Diclofenac from Aqueous Medium Using Layered Double Hydroxide: a Thermodynamic and Theoretical Approach

Bruziquesi

Xavier

Pacheco

et al. 2022

Water Air Soil Pollut

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Kinetics and thermodynamics of Mn(II) removal from aqueous solutions onto Mg-Zn-Al LDH/montmorillonite nanocomposite

Cited by 21 publications

References 44 publications

Mixed Oxide Layered Double Hydroxide Materials: Synthesis, Characterization and Efficient Application for Mn2+ Removal from Synthetic Wastewater

Mixed Oxide Layered Double Hydroxide Materials: Synthesis, Characterization and Efficient Application for Mn2+ Removal from Synthetic Wastewater

Cd(ii) removal by Fe(ii) surface chemically modified layered double hydroxide–graphene oxide: performance and mechanism

Removal of Sodium Diclofenac from Aqueous Medium Using Layered Double Hydroxide: a Thermodynamic and Theoretical Approach

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