Adsorption Models

Faust, Samuel D.; Aly, Osman M.

doi:10.1016/b978-0-409-90000-2.50005-4

Cited by 66 publications

(28 citation statements)

References 19 publications

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“…This difference in performance suggests that the adsorbent structure can significantly influence the Atrazine adsorption. Furthermore, all biomass adsorbents fitted the Freundlich isotherm and pseudo-first-order kinetic models well (R 2 > 0.85), suggesting a heterogeneously distributed adsorption on the biosorbent surface and physisorption as the reaction rate-limiting step [30]. This may suggest that Atrazine could not diffuse as much nitrogen into the adsorbent surface pores or between fibers' interstitial spaces.…”

Section: Impact Of Adsorbent Specific and Contact Surface Areamentioning

confidence: 80%

“…The highest BET of the reported materials at 1112 m 2 /g for activated carbons led to the lowest adsorption performance amongst the series at 16.3% (Table 3, N6). Most of the adsorbent reported fitted the Langmuir isotherm model and the pseudo-second-order kinetic model well, which suggests a homogenous monolayer surface adsorption process that is rate-limited by chemisorption, and hence surface saturation [30]. Figure 1D presents different adsorbent compositions, showing the preferential adsorption of Diazinon on ceramic surfaces over ceramic-carbonaceous adsorbents.…”

Section: Impact Of Adsorbent Specific and Contact Surface Areamentioning

confidence: 99%

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Nanofiber-Based Materials for Persistent Organic Pollutants in Water Remediation by Adsorption

2018

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Fresh water is one of the most precious resources for our society. As a cause of oxygen depletion, organic pollutants released into water streams from industrial discharges, fertilizers, pesticides, detergents or consumed medicines can raise toxicological concerns due to their long-range transportability, bio-accumulation and degradation into carcinogenic compounds. The Stockholm Convention has named 21 persistent organic pollutants (POP) so far. As opposed to other separation techniques, adsorption, typically performed with activated carbons, offers opportunities to combine low operation costs with high performance as well as fast kinetics of capture if custom-designed with the right choice of adsorbent structure and surface chemistry. Nanofibers possess a higher surface to volume ratio compared to commercial macro-adsorbents, and a higher stability in water than other adsorptive nanostructures, such as loose nanoparticles. This paper highlights the potential of nanofibers in organic pollutant adsorption and thus provides an up-to-date overview of their employment for the treatment of wastewater contaminated by disinfectants and pesticides, which is benchmarked with other reported adsorptive structures. The discussion further investigates the impact of adsorbent pore geometry and surface chemistry on the resulting adsorption performance against specific organic molecules. Finally, insight into the physicochemical properties required for an adsorbent against a targeted pollutant is provided.

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Section: Impact Of Adsorbent Specific and Contact Surface Areamentioning

confidence: 80%

Section: Impact Of Adsorbent Specific and Contact Surface Areamentioning

confidence: 99%

Nanofiber-Based Materials for Persistent Organic Pollutants in Water Remediation by Adsorption

2018

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“…This fairly satisfactory empirical isotherm can be used for non ideal adsorption that is multilayer adsorption. The well known expression for the Freundlich model is given as [29]:…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Adsorption Characteristics of Rhodamine B from Aqueous Solution onto Baryte

Vijayakumar

Elango

Dharmendirakumar³

2010

CLEAN Soil Air Water

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Batch sorption experiments were carried out for the adsorption of the basic dye Rhodamine B from aqueous solution using baryte as the adsorbent. The effect of adsorbent dosage, temperature, initial dye concentration and pH were studied. Adsorption data were modeled using first and second order kinetic equations and the intra particle diffusion model. Kinetic studies showed that the adsorption process followed second order rate kinetics with an average rate constant of 0.05458 g mg -1 min -1 . Dye adsorption equilibrium was attained rapidly after 30 min of contact time. The equilibrium data was fitted to the Langmuir, Freundlich and Tempkin isotherms over a dye concentration range of 50 -250 mg/L. The adsorption thermodynamic parameters showed that adsorption was an exothermic, spontaneous and less ordered arrangement process. The adsorbent, baryte, was characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. The results showed that baryte has good potential for the removal of Rhodamine B from dilute aqueous solution.

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“…Physisorption and chemisorption can be classified, to a certain extent, by the magnitude of enthalpy change ΔH 0 . ΔH 0 of <40 kJ/mol are typically considered as those of physisorption bonds [34,35]. Generally, ΔG 0 for physisorption is less than that for chemisorption.…”

Section: Resultsmentioning

confidence: 99%

Electrical Removal Behavior of Carbon Nanotube and Carbon Nanofiber Film in CuCl₂Solution: Kinetics and Thermodynamics Study

Zhan

Nie

Pan

et al. 2011

International Journal of Electrochemistry

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The kinetics, thermodynamics, and isotherms during electrical removal of Cu 2+ by carbon nanotube and carbon nanofiber (CNT-CNF) electrodes in CuCl 2 solution were studied under different solution temperatures, initial Cu 2+ concentrations, and applied voltages. The result shows that Langmuir isotherm can describe experimental data well, indicating monolayer adsorption, and higher Cu 2+ removal and rate constant are achieved at higher voltage, lower initial Cu 2+ concentration, and higher solution temperature. Meanwhile, the thermodynamics analyses indicate that the electrical removal of Cu 2+ onto CNT-CNF electrodes is mainly driven by a physisorption process.

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Adsorption Models

Cited by 66 publications

References 19 publications

Nanofiber-Based Materials for Persistent Organic Pollutants in Water Remediation by Adsorption

Nanofiber-Based Materials for Persistent Organic Pollutants in Water Remediation by Adsorption

Adsorption Characteristics of Rhodamine B from Aqueous Solution onto Baryte

Electrical Removal Behavior of Carbon Nanotube and Carbon Nanofiber Film in CuCl₂Solution: Kinetics and Thermodynamics Study

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Adsorption Models

Cited by 66 publications

References 19 publications

Nanofiber-Based Materials for Persistent Organic Pollutants in Water Remediation by Adsorption

Nanofiber-Based Materials for Persistent Organic Pollutants in Water Remediation by Adsorption

Adsorption Characteristics of Rhodamine B from Aqueous Solution onto Baryte

Electrical Removal Behavior of Carbon Nanotube and Carbon Nanofiber Film in CuCl2Solution: Kinetics and Thermodynamics Study

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Electrical Removal Behavior of Carbon Nanotube and Carbon Nanofiber Film in CuCl₂Solution: Kinetics and Thermodynamics Study