Adsorption Isotherms in Liquid Phase: Experimental, Modeling, and Interpretations

Piccin, Jeferson Steffanello; Cadaval, Tito R.S.; Pinto, Luiz Antônio de Almeida; Dotto, Guilherme L.

doi:10.1007/978-3-319-58136-1_2

Cited by 109 publications

(96 citation statements)

References 51 publications

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“…In order to determine the accuracy of the models, the experimental data were evaluated using the correlation coefficient (R 2 ) and the relative mean error (ARE), presented in Eqs. 10 and 11, respectively (Piccin Jr et al 2017).…”

Section: Equilibrium Studiesmentioning

confidence: 99%

Caffeine removal using Elaeis guineensis activated carbon: adsorption and RSM studies

Melo

Ide

Duarte

et al. 2020

Environ Sci Pollut Res

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The palm (Elaeis guineensis), known as dendê, is an important oleaginous Brazilian plant with a high performance of oil production. In this work, a 2 3 full experimental design was performed and the response surface method (RSM) was used to indicate the optimum parameter of caffeine adsorption on Elaeis guineensis endocarp activated carbon, since the endocarp is the main by-product from dendê oil production. It was set the adsorbent point of zero charge (pH pzc), and the material was characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The RSM results indicate removal efficiency (%) at the optimal conditions, 0.20 g of adsorbent, and caffeine initial concentration of 20 mg/L, and acidic medium was about 95%. Based on ANOVA and F test (F calculated > F standard), the mathematical/statistical model obtained fits well to the experimental data. The overall kinetic studies showed time was achieved after 5 h and caffeine adsorption followed the pseudo-second-order model suggesting chemisorption is a predominant mechanism. Redlich-Peterson and Sips models best represented the experimental data (0.967 < R 2 < 0.993). Thermodynamic revealed that caffeine adsorption was spontaneous at all temperatures studied, exothermic, and probably with changes in the adsorbate-adsorbent complex during the process. The tests conducted in different water matrixes corroborate the suitability of this adsorbent to be used in caffeine removal even in a complex solution.

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Section: Equilibrium Studiesmentioning

confidence: 99%

Caffeine removal using Elaeis guineensis activated carbon: adsorption and RSM studies

Melo

Ide

Duarte

et al. 2020

Environ Sci Pollut Res

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“…According to the Giles classification [ 34 ], the shape of the obtained phosphate adsorption isotherms onto Fe_Alg beads indicates that they are L-type isotherms of subgroup 1 ( Figure 6 ). The isotherms are most commonly found in solute adsorption in aqueous solution and it was indicated that the adsorption occurs due to relatively weak forces, such as van der Waals forces and a low competition from solvent molecules [ 35 ]. The same form of isotherm was received by authors examining the process of phosphate adsorption on various adsorbents, e.g., goethite [ 12 ], wood fiber treated with carboxymethyl [ 18 ] and surfactant-modified natural zeolite [ 36 ].…”

Section: Resultsmentioning

confidence: 99%

“…For the fitting-degree of the isotherms and kinetic equation with the experimental data, the adjusted coefficient of determination, R adj 2 , was used. The R adj 2 is a good tool in selecting models, which takes into account the experimental degrees of freedom ( n 1), where n is the number of data points [ 35 ]. All statistical analyses were performed with the software STATISTICA version 13.3.…”

Section: Methodsmentioning

confidence: 99%

Competitive Interaction of Phosphate with Selected Toxic Metals Ions in the Adsorption from Effluent of Sewage Sludge by Iron/Alginate Beads

Siwek

Pawelec

2020

Molecules

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Wastewater is characterized by a high content of phosphate and toxic metals. Many studies have confirmed the sorption affinity of alginate adsorbents for these ions. In this study, the adsorption of phosphate from effluent of sewage sludge on biodegradable alginate matrices cross-linked with Fe3+ ions (Fe_Alg) was investigated. Kinetics and adsorption isotherms were tested in laboratory conditions in deionized water (DW_P) and in the effluent (SW_P), and in the same solutions enriched in toxic metals ions—Cu2+, Cd2+, Pb2+, and Zn2+ (DW_PM and SW_PM). Batch experiments were performed by changing the concentration of phosphate at constant metal concentration. Kinetics experiments indicated that the pseudo-second-order model displayed the best correlation with adsorption kinetics data for both metals and phosphate. The Freundlich equation provided the best fit with the experimental results of phosphate adsorption from DW_P and DW_PM, while the adsorption from SD_P and SD_PM was better described by the Langmuir equation. For tested systems, the affinity of the Fe_Alg for metal ions was in the following decreasing order: Pb2+ > Cu2+ > Cd2+ > Zn2+ in DW_PM, and Pb2+ > Cu2+ > Cd2+ > Zn2+ in SW_PM. The metals’ enrichment of the DW_P solution increased the affinity of Fe_Alg beads relating to phosphate, while the addition of the metals of the SW_P solution decreased this affinity.

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“…The values of parameters 6 and 1 8 can be determined from the intercept and slope of the plot Hamdaoui and Naffrechoux, 2007;Wei-Hong et al, 2013;Piccin et al, 2011). Usually to obtain experimental data to be fitted into an adsorption model, different initial concentrations of the sorbate and /or different mass of the sorbent is used during the experiment, so as to produce other values of equilibrium sorption capacity (q e ) and equilibrium concentration (C e ) at the end of the experiment.…”

Section: Determination Of the Sorptionmentioning

confidence: 99%

Mopping of crude oil and some refined petroleum products from the environment using sawmill factory waste: adsorption isotherm and kinetic studies

Kelle¹

2018

Journal of Applied Sciences and Environmental Management

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Adsorption Isotherms in Liquid Phase: Experimental, Modeling, and Interpretations

Cited by 109 publications

References 51 publications

Caffeine removal using Elaeis guineensis activated carbon: adsorption and RSM studies

Caffeine removal using Elaeis guineensis activated carbon: adsorption and RSM studies

Competitive Interaction of Phosphate with Selected Toxic Metals Ions in the Adsorption from Effluent of Sewage Sludge by Iron/Alginate Beads

Mopping of crude oil and some refined petroleum products from the environment using sawmill factory waste: adsorption isotherm and kinetic studies

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