Synthesis, Characterization and Application of Mg/Al Layered Double Hydroxide for  the Degradation of Congo Red in  Aqueous Solution

Ayawei, Nimibofa; Angaye, S. S.; Wankasi, Donbebe; Dikio, Ezekiel Dixon

doi:10.4236/ojpc.2015.53007

Cited by 112 publications

(40 citation statements)

References 17 publications

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“…The amounts of adsorbed ammonium ions in time using the Freundlich model were corresponded to the experimental values (Figure 5), which indicate the adjustment of data obtained during the experiment to this model. The Freundlich isotherm is applicable to adsorption processes that occur on heterogonous surfaces [23]. This isotherm gives an expression which defines the surface heterogeneity and the exponential distribution of active sites and their energies [24].…”

Section: Resultsmentioning

confidence: 99%

Removal of Ammonia from the Municipal Waste Treatment Effluents using Natural Minerals

et al. 2019

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Due to various ecological problems, it is required to remove the ammonia nitrogen from wastewater. Industrial wastewater that was not subjected to any purification was used in this study, while most processes described in the literature were carried out using synthetically prepared solutions. The study investigated the removal of ammonium ions using ion exchange on various commercial minerals, in 3 h long batch ion-exchange experiments. Furthermore, research on the sodium chloride activation of the selected mineral was conducted. The screening of the mineral with the highest removal potential was conducted taking into account the adsorption capacity (q) and maximal removal efficiency (E), based on the NH4+ ions changes determined using the selective electrode and spectrophotometric cuvette tests. The highest adsorption capacity (q = 4.92 mg/g) of ammonium ions with the maximum removal efficiency (52.3%) was obtained for bentonite, with a 0–0.05 mm particle size. After pretreatment with a 1 mol/L NaCl solution, maximum efficiency increments were observed (55.7%). The Langmuir adsorption isotherm corresponds well with the equilibrium adsorption data (R2 from 0.97 to 0.98), while the Freundlich model was found to be mismatched (R2 = 0.77). Based on these results it was concluded that natural sorbents may be effectively applied in wastewater treatment. It can be observed that as the size of sorbent particles gets lower, the adsorption capacity, as well as the removal efficiency, gets higher. The bentonite pretreatment with the NaCl solution did not result in the expected efficiency improvement. The 2 mol/L solution affected about 3.5% of the removal efficiency yield.

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Section: Resultsmentioning

confidence: 99%

Removal of Ammonia from the Municipal Waste Treatment Effluents using Natural Minerals

et al. 2019

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“…The essential characteristics of the Langmuir isotherm can be expressed by a dimensionless constant called the separation factor [15].…”

Section: Langmuir Isothermmentioning

confidence: 99%

“…Freundlich isotherm is applicable to adsorption processes that occur on heterogonous surfaces [15]. This isotherm gives an expression which defines the surface heterogeneity and the exponential distribution of active sites and their energies [16].…”

Section: Freundlich Isothermmentioning

confidence: 99%

Modelling and Interpretation of Adsorption Isotherms

Ayawei

Ebelegi

Wankasi

2017

Journal of Chemistry

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1,775

885

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The need to design low-cost adsorbents for the detoxification of industrial effluents has been a growing concern for most environmental researchers. So modelling of experimental data from adsorption processes is a very important means of predicting the mechanisms of various adsorption systems. Therefore, this paper presents an overall review of the applications of adsorption isotherms, the use of linear regression analysis, nonlinear regression analysis, and error functions for optimum adsorption data analysis.

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“…The presence of heavy metals in the industrial wastewater has a serious environmental impact over aquatic life and humans. It is unanimous accepted that heavy metals and dyes has a strong impact on the environment [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Modeling of Solid-Fluid non-catalytic Processes for Nickel Ion Removal

Buema¹,

Lupu²,

Chiriac³

et al. 2020

Rev. Chim.

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The aim of this study is modeling of the process of Ni(II) removal onto new materials synthesized by a facile coprecipitation method. The literature presents different surfactants intercalated on MgAl-LDH with applicability for nickel ions removal, but the researches on the use of this material ��as cast�� as adsorbent for Ni(II) ions are limited, it is reason to develop this study. The morphology, chemical composition, and the basic structure of the new material were analyzed by SEM, EDAX, BET, XRD and FT-IR. The kinetic modeling was performed using the pseudo-first-order, four-type linear pseudo-second-order, and intraparticle diffusion. The experimental data demonstrated that the adsorption process is very fast in the first 20 minutes and reach equilibrium after 50 min. The maximum adsorption capacities of the adsorbent are in the range of 36.5-68.18 mg/g, for the 200-500 mg/L initial solution concentration.

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Synthesis, Characterization and Application of Mg/Al Layered Double Hydroxide for the Degradation of Congo Red in Aqueous Solution

Cited by 112 publications

References 17 publications

Removal of Ammonia from the Municipal Waste Treatment Effluents using Natural Minerals

Removal of Ammonia from the Municipal Waste Treatment Effluents using Natural Minerals

Modelling and Interpretation of Adsorption Isotherms

Modeling of Solid-Fluid non-catalytic Processes for Nickel Ion Removal

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