Kinetic modeling of the adsorption of basic dyes by kudzu

Allen, Stephen; Gan, Quan; Matthews, Ronan; Johnson, Pauline A.

doi:10.1016/j.jcis.2004.12.043

Cited by 150 publications

(89 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Its value determines how fast the equilibrium in the system can be reached [37]. This parameter usually decreases with increasing of initial solute concentration in the bulk liquid phase [37][38][39][40][41]. Obviously, the higher the initial concentration of solute in bulk liquid phase, the longer time is needed for that system to reach equilibrium state [37].…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Utilization of rarasaponin natural surfactant for organo-bentonite preparation: Application for methylene blue removal from aqueous effluent

Kurniawan

Sutiono

et al. 2011

Microporous and Mesoporous Materials

View full text Add to dashboard Cite

Section: Adsorption Kineticsmentioning

confidence: 99%

Utilization of rarasaponin natural surfactant for organo-bentonite preparation: Application for methylene blue removal from aqueous effluent

Kurniawan

Sutiono

et al. 2011

Microporous and Mesoporous Materials

View full text Add to dashboard Cite

“…The mechanism of adsorption can also be described as chemisorptions, involving valency forces through sharing or the exchange of electrons between adsorbent and adsorbate as covalent forces. Allen et al [51] tested the application of pseudo first-and second-order equations for the description of the adsorption kinetics of three basic dyes onto kudzu, finding the pseudo second-order equation to be more suitable and stating that the chemical reaction was important and significant in the rate-controlling step [35] . Figure 10 shows the amount of dye adsorbed versus t 1/2 for intraparticle transport of MB by tripoli.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Antimicrobial Activity of Some Medicinal Plants from Malaysia

Philip¹,

Malek²,

Sani³

et al. 2009

American J. of Applied Sciences

View full text Add to dashboard Cite

Problem statement: It is well documented that lead is one of contaminants of industrial wastewaters and its pollution exists in the wastewater of many industries. As a result, recent research has focused on the development of cost effective alternatives using various natural sources and industrial wastes. In this setting, the use of low-cost agricultural materials, waste and residues for recovering heavy metals from contaminated industrial effluent has emerged as a potential alternative method to high cost adsorbents. In the present study, adsorption of lead(II) ions onto Orange Peel (OP), a typical agricultural byproduct, was investigated systematically with the variation in the parameters of pH, sorbent dosage, contact time and the initial concentration of adsorbate. Langmuir and Freundlich isotherms were used to analyze the equilibrium data. Kinetic and thermodynamic parameters were also calculated to describe the adsorption mechanism. Approach: The Orange Peel (OP) was obtained from a local market in the south of Jordan. The orange peel was cut into small pieces using scissors. Then OP was dried at 100°C for 24 h using hot air oven. Qualitative analyses of the main functional groups involved in metal adsorption were performed using a Fourier transformed infrared spectrometer (Perkin-Elmer FTIR 1605, ¨Uberlingen, Germany). Biosorption experiments were carried out in a thermostatic shaker at 180 rpm and at an ambient temperature (20±2°C) using 250 mL shaking flasks containing 100 mL of different concentrations and initial pH values of Pb(II) solutions, prepared from reagent grade salt Pb(NO 3 ) 2 (Merck). The initial pH values of the solutions were previously adjusted with 0.1 M HNO 3 or NaOH and measured using a hand held pH meters (315i/SET). The sorbent (0.2-1.0 g) was added to each flask and then the flasks were sealed up to prevent change of volume of the solution during the experiments. After shaking the flasks for predetermined time intervals, the samples were withdrawn from the flasks and filtered through a Whatman filter paper. The filtrate was analyzed by AAS (Perkin Elmer Analyst 300). Results: Four kinetic models are the pseudo-first-order, pseudo-second-order, Elovich and intraparticle diffusion equations, were selected to interpret the adsorption data. Kinetic parameters such as the rate constants, equilibrium adsorption capacities and related correlation coefficients, for each kinetic model were calculated and discussed. The linear Langmuir and Freundlich models were applied to describe equilibrium isotherms and both models fitted well. The monolayer adsorption capacity was found as 21.1 mg g −1 at pH 6 and 20°C.The dimensionless separation factor (R L ) has shown that orange peel can be used for removal of Pb(II) from aqueous solutions. The nagative free energy of adsorption indicated that the adsorption of lead (II) ions onto orange peel was feasible and spontaneous. Conclusion: The sorption capacity of the orange peel is comparable to the other available adsorbents and it is quite c...

show abstract

“…Figure 8 shows the kinetic results of the chitosan adsorption process. Contrary to several similar work in the literature [13,[26][27][28][29][30][31]35], in which the best contact-time was around 100 min, the contact-time necessary for the equilibrium of the IOG chitosan adsorption is of about 5 h. In order to study the adsorption mechanism, the kinetic data was fitted according to the equations (2) and (3) [37,63], that are integrated rate laws for pseudo first-and second orders, respectively; Q e and Q t are the amount of dye adsorbed onto chitosan at equilibrium and a time t, respectively; k 1 (min -1 ) and k 2 (g mg -1 min -1…”

Section: Resultsmentioning

confidence: 99%

“…Due to its molecular structure, featuring the presence of amino (-NH 2 ) and hydroxyl (-OH) groups, chitosan displays a high affinity for many classes of compounds and has been widely used for the removal of transitions metal ions [14][15][16][17][18][19][20][21][22][23][24][25], dyes and inks [26][27][28][29][30][31][32][33][34][35][36][37], lysozime [38], proteins [39], cholesterol [40], urea [41,42] and several other organic compounds [43][44][45][46][47][48][49]. Chitosan can also be chemically modified to produce fibers, composites and supports, improving its adsorption capacity and offering potential applications in several fields [18-24, 29, 38-44, 49, 50].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Kinetics and thermodynamics of indanthrene textile dye adsorption onto chitosan

Chaves¹,

Bezerra²,

Santana³

et al. 2010

E-Polymers

View full text Add to dashboard Cite

Abstract:The kinetics and equilibrium of Indanthrene Olive Green (IOG) adsorption on chitosan, from aqueous solutions, have been investigated. The chitosan was characterized by XRD, average degree of deacetylation (DD), TGA/DTG, IR, SEM and specific BET surface area. Batch adsorptions experiments were carried out in different pH and dye concentration. An acidic pH condition (4.0 to 6.0) was favorable to the adsorption process. The adsorption followed secondorder rate kinetics and the experimental equilibrium data followed Langmuir isotherm, suggesting that chemisorption might be the major adsorption mode. The adsorptions also occurred on chitosan fibers, being significantly lower than that of crushed chitosan. Thermodynamic parameters ( G°, H°, and S°) were calculated. The positive values of H° (161.7 kJ mol -1 ) and S° (559.9 J mol -1 K -1 ) suggest that the adsorption is endothermic and that during this adsorption process the randomness of the system increases. A simplified adsorption model is also proposed.

show abstract

Kinetic modeling of the adsorption of basic dyes by kudzu

Cited by 150 publications

References 40 publications

Utilization of rarasaponin natural surfactant for organo-bentonite preparation: Application for methylene blue removal from aqueous effluent

Utilization of rarasaponin natural surfactant for organo-bentonite preparation: Application for methylene blue removal from aqueous effluent

Antimicrobial Activity of Some Medicinal Plants from Malaysia

Kinetics and thermodynamics of indanthrene textile dye adsorption onto chitosan

Contact Info

Product

Resources

About