Characteristics of pseudo-second-order kinetic model for liquid-phase adsorption: A mini-review

Wu, Feng‐Chin; Tseng, Ru‐Ling; Huang, Shang-Chieh; Juang, Ruey‐Shin

doi:10.1016/j.cej.2009.02.024

Cited by 340 publications

(160 citation statements)

References 54 publications

(61 reference statements)

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“…This indicates that the adsorption process of the 4-CP onto the activated carbon fits the second order kinetic model. Similar results were obtained by other authors [7,18,[20][21][22]25]. All the results obtained from the pseudo-first order kinetic model were weaker in each case, and therefore they were not taken into account and are not shown.…”

Section: Adsorption Studiessupporting

confidence: 76%

“…We chose 4-chlorophenol (4-CP) as the target contaminant because it is poisonous to aquatic life, plants and humans at low level [12] and is commonly found in drinking water [13]. In addition, the adsorption of 4-chlorophenol on activated carbon is well described [7,[14][15][16][17][18][19][20][21][22][23]. 4-Chlorophenol was adsorbed onto various modified and unmodified activated carbons; the effect of other factors affecting the adsorption of the 4-CP on activated carbon including the ionic strength [24] and pH [25] has also been described.…”

Section: Introductionmentioning

confidence: 99%

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The influence of different agitation techniques on the adsorption kinetics of 4-chlorophenol on granular activated carbon

Kuśmierek

Świątkowski

2015

Reac Kinet Mech Cat

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The influence of different agitation techniques on the adsorption of organic compounds, represented by 4-chlorophenol, onto granular activated carbon was investigated. The effect of the flask type and the type of agitator, including a laboratory shaker, mechanical agitator, magnetic stirrer as well as mixing with gas bubbles, was studied. The results of adsorption kinetics demonstrate that the adsorption process of 4-chlorophenol on the activated carbon follows a pseudo-second order kinetic model closely. The adsorption equilibrium was reached faster in the Erlenmeyer flask than in the round-bottomed flask. At the same agitation speed (200 rpm), the better adsorption rate and adsorption efficiency were observed using the mechanical and magnetic stirrers than the laboratory shaker. At the gas flow rate of 1.5 dm 3 min -1 , the mixing with the air or nitrogen bubbles was comparable with the agitation when using mechanical and magnetic stirrers at 200 rpm. The effect of the agitation speed on the adsorption of the 4-chlorophenol by the activated carbon was also tested. The kinetic experiments were carried out at 100, 200, 300 and 500 rpm and it was found that the adsorption rate increases with the increase in the agitation speed. As the stirring rate increased from 100 to 500 rpm, the adsorption rate constants increased from 0.577 to 1.264 g mmol -1 h -1 (mechanical agitator) and from 0.560 to 1.231 g mmol -1 h -1 (magnetic stirrer), respectively. The experimental results demonstrate that the agitation affects the adsorption kinetics significantly as well as the adsorption equilibrium of the organic compounds on the activated carbon, and should be taken into account in such studies.

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Section: Adsorption Studiessupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

The influence of different agitation techniques on the adsorption kinetics of 4-chlorophenol on granular activated carbon

Kuśmierek

Świątkowski

2015

Reac Kinet Mech Cat

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“…Agreed the results of the work performed by previous researchers for adsorption of formaldehyde pollutants using activated carbon prepared from bone char [9]. Wu et al [10] reported that the pseudo second-order model were suitable for adsorption of adsorbate with low molecular weight on smaller adsorbent particles as described for this work. …”

Section: Adsorption Kineticmentioning

confidence: 88%

Adsorptive Removal of Formaldehyde by Chemically Bamboo Activated Carbon with addition of Ag nanoparticle: Equilibrium and Kinetic

Rengga

Sudibandriyo

Nasikin

2016

MATEC Web of Conferences

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Abstract. Carbon was prepared from dried waste bamboo (Dendrocalamus asper) using chemical activation with KOH. The carbon was prepared with the activating agent in a mass ratio of KOH and dried bamboo (3:1) at 800oC. Using impregnation technique, the bamboo-based activated carbon has developed with modified Ag nanoparticle (Ag-AC) to capture formaldehyde. The Ag-AC has characteristics of moderate surface area of 685 m2/g and average pore size of 2.7 nm. The adsorption equilibriums and kinetics of formaldehyde on Ag-AC measured. The influences of initial formaldehyde on adsorption performance have measured in a batch system. The equilibrium data were evaluated by isotherm models of Langmuir, Freundlich, and Temkin. The Langmuir model well describes the adsorptive removal of formaldehyde on Ag-AC in this study. Pseudo-first-order and pseudo-second-order kinetic equations were applied to test the experimental data. The pseudo-second-order exhibited the best fit for kinetic study.

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“…Kinetics were analyzed using the pseudo-second order model by Eq. (5) (Coleman et al, 1956), since it has been shown to be appropriate for many sorption processes (Ho, 2006;Ho and McKay, 1999;Wu et al, 2009):…”

Section: Discussionmentioning

confidence: 99%

Simultaneous removal of PAHs and metal contaminants from water using magnetic nanoparticle adsorbents

Huang

Fulton

Keller

2016

Science of The Total Environment

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• Fast magnetic nanosorbents for simultaneous removal of PAHs and metals • Stable remediation performance across wide pH range (4-9) • High water hardness resistance across wide range of Ca 2 + or Mg 2 + concentration • Low energy use for regeneration of adsorbent and able to reuse multiple times Many industrial wastewaters are contaminated with both heavy metal ions and organic compounds, posing a major threat to public health and the environment. In this study, magnetic nanoparticle adsorbents, namely Mag-PCMA-T, which contain a maghemite core and a silica mesoporous layer that permanently confines surfactant micelles within the mesopores, were synthesized to achieve simultaneous removal of polycyclic aromatic hydrocarbons (PAHs) (1 mg/L) and metal contaminants (1 mg/L). The individual removal efficiency of Cd 2+ and acenaphthene using Mag-PCMA-T was evaluated under a range of initial ion concentrations and adsorbent dosages, as well as the competitive adsorption with Cd 2+ and acenaphthene simultaneously present. The isotherms and kinetics of Cd 2+ and acenaphthene sorption onto Mag-PCMA-T were determined. Mag-PCMA-T removed N85% of the acenaphthene in b30 min, with relatively high sorption capacity (up to 1060 mg/kg). Mag-PCMA-T also exhibited high sorption capacity for Cd 2+ (up to 2250 mg/kg). The simultaneous sorption performance was stable across a wide pH range (4-9) as well as in the presence of competitive metal ions (Ca 2+ and Mg 2+ ) or natural organic matters. The Mag-PCMA-T can be regenerated and reused, providing a sustainable, fast, convenient, and efficient approach for water treatment. b s t r a c t a r t i c l e i n f o© 2016 Published by Elsevier B.V. Contents lists available at ScienceDirectScience of the Total Environment

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Characteristics of pseudo-second-order kinetic model for liquid-phase adsorption: A mini-review

Cited by 340 publications

References 54 publications

The influence of different agitation techniques on the adsorption kinetics of 4-chlorophenol on granular activated carbon

The influence of different agitation techniques on the adsorption kinetics of 4-chlorophenol on granular activated carbon

Adsorptive Removal of Formaldehyde by Chemically Bamboo Activated Carbon with addition of Ag nanoparticle: Equilibrium and Kinetic

Simultaneous removal of PAHs and metal contaminants from water using magnetic nanoparticle adsorbents

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