Characterization, isotherm and kinetic studies for ammonium ion adsorption by light expanded clay aggregate ( LECA )

Sharifnia, Shahram; Khadivi, Mohammad Ali; Shojaeimehr, Tahereh; Shavisi, Y.

doi:10.1016/j.jscs.2012.12.003

Cited by 49 publications

(28 citation statements)

References 34 publications

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“…An adsorbed ammonium of 47.61 mg/g was achieved by 180 min, while increasing reaction time to 240 min resulted in an adsorbed ammonium of 48.88 mg/g. It is related to the presence of unsaturated adsorptive sites at the beginning of the process for rapid adsorption of ammonium ions in the pores , while by increasing contact time, the rate of adsorption becomes equal to the rate of desorption . Reaching equilibrium time indicates the formation of a monolayer ammonium ion onto adsorbent surface .…”

Section: Resultsmentioning

confidence: 99%

“…Although the major components of light expanded clay aggregate (LECA) utilized by Sharifnia et al . for ammonium removal consists of SiO 2 (64.8%), Al 2 O 3 (15.05%), and Fe 2 O 3 (7.45%), its application for ammonium removal involves a much lower adsorption capacity as compared to the ferrosilicon compound . The higher adsorption capacity of ferrosilicon compound for ammonium removal could be ascribed to the higher percentage of SiO 2 (84.18%) and Fe 2 O 3 (10.22%).…”

Section: Resultsmentioning

confidence: 99%

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Application of a compound containing silica for removing ammonium in aqueous media

Soltani

Safari

Rezaee

et al. 2014

Env Prog and Sustain Energy

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In the present investigation, removal of ammonium from aqueous solutions by a compound containing silica was considered. The compound was a waste of ferrosilicon compound produced during Ferro-alloy manufacturing. The results showed that an increase in the pH of solution up to 7 caused a rapid increase in the adsorbed ammonium to 36.21 mg/g. But adsorbed ammonium was decreased to 26.51 mg/g as the initial pH reached to 10. The amount of adsorbed ammonium was increased with contact time and initial ammonium concentration. A contact time of 180 min was selected because there was no significant increment in adsorbed ammonium as contact time was further increased. The results exhibited suitability of the pseudo-second order kinetic model (R 2 5 0.9867). Increasing initial ammonium concentration from 10 to 180 mg/L resulted in an increment in adsorbed ammonium from 6.69 to 59.13 mg/g, respectively. The obtained data were fitted to Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherm models in which the obtained correlation coefficient showed the relatively better fitness of the data to Langmuir model (R 2 5 0.9969) with a maximum adsorption capacity of 78.74 mg/g.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Application of a compound containing silica for removing ammonium in aqueous media

Soltani

Safari

Rezaee

et al. 2014

Env Prog and Sustain Energy

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“…Table illustrates the adsorption capacities of different adsorbents from previous studies that investigated the removal of

{normalN normalH}_{4}^{+} ‐ normalN

from aqueous solution and synthetic wastewaters. In comparison with other adsorbents, the adsorption capacity of CCB is satisfactory but generally of smaller value when utilized in the removal of

{normalN normalH}_{4}^{+} ‐ normalN

…”

Section: Resultsmentioning

confidence: 97%

Removal of ammonium‐nitrogen from aqueous solution using chitosan‐coated bentonite: Mechanism and effect of operating parameters

Luna

Futalan²,

Jurado

et al. 2017

J of Applied Polymer Sci

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Wastewater containing high concentration of ammonium‐nitrogen ( normalNnormalH4+‐normalN) is not effectively addressed by biological treatment and when released into water bodies can cause eutrophication. In this study, the removal of normalNnormalH4+‐normalN from simulated wastewater using chitosan‐coated bentonite (CCB) was investigated. The effects of normalNnormalH4+ salt used, pH, CCB dosage, agitation rate, and temperature on the removal of normalNnormalH4+‐normalN were studied. The highest normalNnormalH4+‐normalN removal of 67.5% was attained at the following conditions: initial pH 4.0, CCB dose of 8.0 g, agitation rate of 150 rpm, and temperature of 35 °C. Fourier transform infrared analysis indicated two mechanisms: normalNnormalH4+‐normalN adsorption onto CCB involving hydrogen bonding with hydroxyl groups (OH) and ion exchange between normalNnormalH4+‐normalN and cations present in the interlayer of bentonite. Experimental data follows the pseudo‐second‐order kinetic model (R2 = 0.9964) and Koble–Corrigan isotherm (R2 = 0.9705). Thermodynamic studies showed that the adsorption process is spontaneous (ΔG0 < 0), endothermic (ΔH0 > 0) in nature, and leads to an increase in randomness at the solid–solution interface (ΔS0 > 0). © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45924.

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“…The results of the studies of Sharifnia et al [60] and Karadag et al [64] have shown that the equilibrium data of ammonium sorption were fitted well by the Langmuir and Freundlich isotherm models. Abdulgawad et al [27] claimed that ammonium adsorption on montmorillonite, kaolinite, coarse and fine sand obeys the Freundlich adsorption isotherm.…”

Section: Equilibrium Studiesmentioning

confidence: 88%

“…Comparison of the values of correlation coefficients (R 2 ) values of the pseudo-first order, pseudo-second order, and intra-particle diffusion models shows that the ammonium sorption data were best described by the pseudo-second order kinetic model. The results of the studies by Sharifnia et al [60] have shown that the kinetics of ammonium sorption follows the pseudo-second order kinetic model (Figures 5-7). Weber and Morris [49] suggested that the mechanism of sorption is via intra-particle diffusion when the plot of q t versus t 1/2 is linear, and if the sorption process is controlled by more than one mechanism, the plot of q t versus t 1/2 is multi-linear [61].…”

Section: Effect Of Contact Time On the Reduction Of Ammonium And Sorpmentioning

confidence: 93%

Kinetic and Equilibrium Studies of Sorption of Ammonium in the Soil-Water Environment in Agricultural Areas of Central Poland

Sieczka

Koda

2016

Applied Sciences

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Sorption characteristics of nitrogen compounds is necessary in ascertaining their fate in the soil-water environment. This paper presents a laboratory "batch" experiment for determining the sorption parameters of ammonium in the soil-water environment. Three agricultural soils (silt loam, loam, and sand) with different contents of the clay fraction, significantly affecting the range of the adsorption of contaminants on the surface of solid particles, were chosen as research material. Considering the composition of ammonium nitrate (a commonly used fertilizer in Poland), ammonium solutions with a concentration of 0-52 mg NH 4 + /L were used as markers. Pseudo-first order, pseudo-second order, and intra-particle diffusion kinetic models were used to describe the mechanisms of ammonium adsorption. Experimental data obtained from the equilibrium tests have been analysed using two-parameter (Freundlich, Langmuir, Temkin) and three-parameter (Redlich-Peterson, Hill, Sips) models. In order to adjust the parameters of the considered isotherms to the experimental data, the method of minimization of the sum of squared errors was used. Additionally, the maximum sorption capacities and reduction ratios of ammonium versus time were assessed. It was observed that the presence of silt loam and loam in the soil profile can increase the possibility of ammonium adsorption up to almost 20%. Taking into consideration the results of the batch tests, it was concluded that ammonium adsorption attains equilibrium within 48 h. Experimental data was best followed by the pseudo-second order equation and the adsorption isotherm conformed to the Redlich-Peterson model for loam and sand.

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Characterization, isotherm and kinetic studies for ammonium ion adsorption by light expanded clay aggregate ( LECA )

Cited by 49 publications

References 34 publications

Application of a compound containing silica for removing ammonium in aqueous media

Application of a compound containing silica for removing ammonium in aqueous media

Removal of ammonium‐nitrogen from aqueous solution using chitosan‐coated bentonite: Mechanism and effect of operating parameters

Kinetic and Equilibrium Studies of Sorption of Ammonium in the Soil-Water Environment in Agricultural Areas of Central Poland

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