Adsorption kinetic models: Physical meanings, applications, and solving methods

Wang, Jianlong; Guo, Xuan

doi:10.1016/j.jhazmat.2020.122156

Cited by 1,487 publications

(610 citation statements)

References 156 publications

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“…The q e changed by 1.4% aer 24 h 11.4g g À1 , indicating that adsorption equilibrium as already achieved by 2 h. Pseudo-rst order (PFO) and pseudo-second order (PSO) 47,48 are the empirical kinetic models that give the rate of the adsorption. For PFO (eqn (1)), the plot of ln(q e À q t ) vs. t (Fig.…”

Section: Oil-water Separation Adsorption Capacitymentioning

confidence: 99%

“…The rate of adsorption from PSO (k PSO ) is similar to k PFO , showing agreement with the general adsorption rate performance of CM-500c. Possible physical interpretations of PFO and PSO were elucidated, [48][49][50] and two of the conditions where a general kinetic model becomes PFO or PSO are based on (1) the active sites of the adsorbent as the rate-limiting stepi.e. a function of the affinity of the adsorbate to the adsorbent, and the (2) the number of active sites of the adsorbent.…”

Section: Oil-water Separation Adsorption Capacitymentioning

confidence: 99%

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Fused sphere carbon monoliths with honeycomb-like porosity from cellulose nanofibers for oil and water separation

et al. 2021

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Section: Oil-water Separation Adsorption Capacitymentioning

confidence: 99%

Section: Oil-water Separation Adsorption Capacitymentioning

confidence: 99%

Fused sphere carbon monoliths with honeycomb-like porosity from cellulose nanofibers for oil and water separation

et al. 2021

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“…where C 0 and C t (mg/L) are acid dye concentrations in the solution before adsorption and after sorption time t, respectively; V (L) is volume of the dye solution and m (g) is mass of DVB-co-GMA-TETA. The kinetics of AV1, AG16 and AR18 adsorption on DVB-co-GMA-TETA were examined to explore the dye retention rate-controlling mechanism using the pseudo-first order (PFO), the pseudo-second order (PSO) and intraparticle diffusion (IPD) kinetic models [30,31]. The equations of the above mentioned models (Equations (7)-(9)) are expressed as:…”

Section: Determination Of Kinetic Parametersmentioning

confidence: 99%

Application of Functionalized DVB-co-GMA Polymeric Microspheres in the Enhanced Sorption Process of Hazardous Dyes from Dyeing Baths

Wawrzkiewicz

Podkościelna

2020

Molecules

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Intensive development of many industries, including textile, paper, plastic or food, generate huge amounts of wastewaters containing not only toxic dyes but also harmful auxiliaries such as salts, acid, bases, surfactants, oxidants, heavy metal ions. The search for effective pollutant adsorbents is a huge challenge for scientists. Synthesis of divinylbenzene copolymer with glycidyl methacrylate functionalized with triethylenetetramine (DVB-co-GMA-TETA) resin was performed and the obtained microspheres were evaluated as a potential adsorbent for acid dye removal from dyeing effluents. The sorption capacities were equal to 142.4 mg/g for C.I. Acid Green 16 (AG16), 172 mg/g for C.I. Acid Violet 1 (AV1) and 216.3 mg/g for C.I. Acid Red 18 (AR18). Non-linear fitting of the Freundlich isotherm to experimental data was confirmed rather than the Langmuir, Temkin and Dubinin-Radushkevich. The kinetic studies revealed that intraparticle diffusion is the rate-limiting step during dye adsorption. Auxiliaries such as Na2SO4 (5–25 g/L), CH3COOH (0.25–1.5 g/L) and anionic surfactant (0.1–0.5 g/L) present in the dyeing baths enhance the dye adsorption by the resin in most cases. Regeneration of DVB-co-GMA-TETA is possible using 1 M NaCl-50% v/v CH3OH.

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“…Pseudo first order, pseudo second order, and particle diffusion models are among the widely used models to describe the adsorption process. A wide range of standard models are available that describe adsorption at different conditions and the most suitable can be chosen for the given experimental conditions [108]. Adsorption of dyes using rice husks biochar was investigated, and from various kinetic models that were tested, pseudo second order model was the most suitable one to describe the experimental observations of the adsorption of malachite green dye using biochar [104], and the Elovich model was used in order to conclude that the mechanism of adsorption was chemisorption.…”

Section: Adsorption Kinetic Studiesmentioning

confidence: 99%

“…Primarily a mathematical concept, one can infer various aspects regarding adsorption from kinetic studies. Considering all the influencing factors and different experimental conditions, one can apply kinetic studies to study the adsorption of dyes or any such pollutant using biochar and gain a much deeper and greater understanding of the concept [108].…”

Section: Adsorption Kinetic Studiesmentioning

confidence: 99%

Biochar as an Eco-Friendly and Economical Adsorbent for the Removal of Colorants (Dyes) from Aqueous Environment: A Review

Srivatsav¹,

Bhargav²,

Shanmugasundaram³

et al. 2020

Water

165

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Dyes (colorants) are used in many industrial applications, and effluents of several industries contain toxic dyes. Dyes exhibit toxicity to humans, aquatic organisms, and the environment. Therefore, dyes containing wastewater must be properly treated before discharging to the surrounding water bodies. Among several water treatment technologies, adsorption is the most preferred technique to sequester dyes from water bodies. Many studies have reported the removal of dyes from wastewater using biochar produced from different biomass, e.g., algae and plant biomass, forest, and domestic residues, animal waste, sewage sludge, etc. The aim of this review is to provide an overview of the application of biochar as an eco-friendly and economical adsorbent to remove toxic colorants (dyes) from the aqueous environment. This review highlights the routes of biochar production, such as hydrothermal carbonization, pyrolysis, and hydrothermal liquefaction. Biochar as an adsorbent possesses numerous advantages, such as being eco-friendly, low-cost, and easy to use; various precursors are available in abundance to be converted into biochar, it also has recyclability potential and higher adsorption capacity than other conventional adsorbents. From the literature review, it is clear that biochar is a vital candidate for removal of dyes from wastewater with adsorption capacity of above 80%.

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Adsorption kinetic models: Physical meanings, applications, and solving methods

Cited by 1,487 publications

References 156 publications

Fused sphere carbon monoliths with honeycomb-like porosity from cellulose nanofibers for oil and water separation

Fused sphere carbon monoliths with honeycomb-like porosity from cellulose nanofibers for oil and water separation

Application of Functionalized DVB-co-GMA Polymeric Microspheres in the Enhanced Sorption Process of Hazardous Dyes from Dyeing Baths

Biochar as an Eco-Friendly and Economical Adsorbent for the Removal of Colorants (Dyes) from Aqueous Environment: A Review

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