Mechanism of Adsorption of Dyes and Phenols from Water Using Activated Carbons Prepared from Plum Kernels

Juang, Ruey‐Shin; Wu, Feng‐Chin; Tseng, Ru‐Ling

doi:10.1006/jcis.2000.6912

Cited by 165 publications

(78 citation statements)

References 30 publications

(36 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the fact that the line depicted in Figure 5 does not pass through the origin indicates that intra-pore diffusion is not the controlling step in sorption of Cd 2 þ ions by PMW (Al-Asheh and Banat, 2001;Weber and Morris, 1963). These data agree with those reported by Juang et al (2000), who proposed that the first sharp portion of the curve should be attributed to adsorption on the external surface of the sorbent while the second gradual portion should be attributed to intra-pore diffusion. The larger the intercept, the greater is the contribution of the surface adsorption in the rate-limiting step.…”

Section: Kinetics Of the Adsorption Processsupporting

confidence: 81%

Cadmium(II) sorption from water samples by powdered marble wastes

Ghazy

Gabr

Gad

2008

Chemical Speciation & Bioavailability

View full text Add to dashboard Cite

A series of batch adsorption experiments were carried out, with the aim of removing cadmium ions from aqueous solutions and water samples using powdered marble wastes (PMW) as an effective inorganic sorbent. PMW is inexpensive, widespread, and may be considered as environmental problem. The main parameters (i.e. solution pH, sorbent and cadmium concentrations, stirring time, and temperature) influencing the sorption process were investigated. The results obtained for sorption of cadmium ions onto PMW are well described by the Freundlich and Langmuir models. The DubininRadushkevick (D -R) isotherm model was applied to describe the nature of the adsorption of the metal ion; it was found that the adsorption process was chemical in nature. The thermodynamic parameters were also calculated from the Gibbs free energy change (DG ), enthalpy (DH ) and entropy (DS ). These parameters indicated that the adsorption process of cadmium(II) ions on PMW was spontaneous and endothermic in nature. Under the optimum experimental conditions employed the removal of ca $100% of Cd 2 þ ions was attained. The procedure was successfully applied to removal of the cadmium ions from aqueous and various natural water samples. The adsorption mechanism is discussed.

show abstract

Section: Kinetics Of the Adsorption Processsupporting

confidence: 81%

Cadmium(II) sorption from water samples by powdered marble wastes

Ghazy

Gabr

Gad

2008

Chemical Speciation & Bioavailability

View full text Add to dashboard Cite

show abstract

“…Akçay [37] found that the sorption rate of p-chlorophenol by organophilic bentonite fit the pseudo-firstorder kinetics. However, it was clearly found that the pseudosecond-order equation, which agrees with chemisorption as the rate-control mechanism, was able to better describe the sorption of phenolic compounds onto organoclays [2,6,38] and other sorbents [39,40].…”

Section: Sorption Kinetics Of Phenolmentioning

confidence: 95%

Effect of lead on the sorption of phenol onto montmorillonites and organo-montmorillonites

Yan

Shan

Wen

et al. 2007

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

The effect of lead (Pb) on the sorption of phenol onto montmorillonite-based sorbents was studied using a batch equilibration method when phenol and Pb were sorbed simultaneously and either Pb or phenol was previously sorbed. The sorbents were Na + -, Ca 2+ -, hexadecyl trimethylammonium (HDTMA)-Na + -, and HDTMA-Ca 2+ -montmorillonites. Pb diminished the sorption of phenol largely onto Na + -or Ca 2+ -montmorillonites, while phenol had little effect on the sorption of Pb onto all sorbents. Pb had no effect on the sorption of phenol onto HDTMA-Na + -or HDTMA-Ca 2+ -montmorillonites either. The sorption capacity of phenol followed the order HDTMA-Na + -> HDTMA-Ca 2+ -> Na + -> Ca 2+ -montmorillonites. The pseudo-second-order equation described the kinetics of phenol sorption well. Sorption isotherms of phenol followed the Freundlich equation. Phenol sorption on HDTMA-Na + -and HDTMA-Ca 2+ -montmorillonites was linear, while that on Na + -and Ca 2+ -montmorillonites was nonlinear.

show abstract

“…Because various functionalities including oxygen, chloride, and copper groups on the carbon surface may cause various types of adsorbent-adsorbate interactions, a lumped and simplified kinetic analysis is a practical approach from a system design viewpoint (Juang et al, 2000;Yang et al, 2005;Hsi et al, 2011Hsi et al, , 2012. The pseudo-first and secondorder kinetic models assuming that adsorption is resolved by pseudo chemical reaction processes were chosen and the adsorption rates can be determined respectively by the following first-order and second-order reaction rate equations: ) are the pseudo first and second-order rate constants, respectively.…”

Section: Kinetic Analysis Of Hg 0 Adsorption On Crude and Cucl 2 -Impmentioning

confidence: 99%

Influences of Copper(II) Chloride Impregnation on Activated Carbon for Low-Concentration Elemental Mercury Adsorption from Simulated Coal Combustion Flue Gas

Tsai

Chiu

Chuang

et al. 2017

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

In this study, the Hg 0 adsorption equilibrium and kinetics of a coconut-shell-based activated carbon impregnated with CuCl 2 were examined with respect to their resulting physical and chemical properties. Integrating the results from N 2 adsorption isotherm at 77 K, scanning electron microscopy, elemental analysis, X-ray photoelectron spectroscopy, and Hg 0 adsorption experiments under N 2 and simulated coal-combustion flue gases conditions, it was found that HCl pretreatment could enhance Hg 0 adsorption of crude activated carbon; the Hg 0 adsorption capacities of crude and HCl-pretreated activated carbon under N 2 condition were 95.8 and 225.4 µg g -1 , respectively. Additionally, CuCl 2 impregnation further increased the adsorption capacity of crude. The Hg 0 adsorption capacity of crude activated carbon with 8% CuCl 2 impregnation was 631.1 µg g -1 . However, the equilibrium Hg 0 adsorption capacity decreased when Cu loading exceeded 8 wt%, suggesting that adequate forms of surface Cu, O and Cl interacting with flue gas components and Hg 0 , as well as the presence of pores with specific size ranges allowing rapid transport of the Hg molecules into the interior of the activated carbon and as energy sinker govern the overall chemisorption process. Pseudo-second-order kinetic model could best describe the adsorption behaviors of tested samples under both test conditions, indicating that Hg 0 adsorbed on the activated carbon surface could be explained by bimolecular reaction mechanisms.

show abstract

Mechanism of Adsorption of Dyes and Phenols from Water Using Activated Carbons Prepared from Plum Kernels

Cited by 165 publications

References 30 publications

Cadmium(II) sorption from water samples by powdered marble wastes

Cadmium(II) sorption from water samples by powdered marble wastes

Effect of lead on the sorption of phenol onto montmorillonites and organo-montmorillonites

Influences of Copper(II) Chloride Impregnation on Activated Carbon for Low-Concentration Elemental Mercury Adsorption from Simulated Coal Combustion Flue Gas

Contact Info

Product

Resources

About