Applicability of the various adsorption models of three dyes adsorption onto activated carbon prepared waste apricot

Başar, Canan Akmil

doi:10.1016/j.jhazmat.2005.11.055

Cited by 400 publications

(165 citation statements)

References 26 publications

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“…The mean adsorption energy, E, which gives information about chemical and physical adsorption was found to be in the range 17.7 to 21.3 KJ mol -1 . This is bigger than the energy range of adsorption reaction (8-16 KJ mol -1 ) [23], and thus the adsorption of P onto the dewatered alum sludge cakes may also involve chemical adsorption. The Temkin plot (Fig.…”

Section: [Insert Fig 2 Here] [Insert Table 1 Here]mentioning

confidence: 96%

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Equilibrium and kinetic analysis of phosphorus adsorption from aqueous solution using waste alum sludge

Babatunde

Zhao

2010

Journal of Hazardous Materials

126

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Excess phosphorus (P) in wastewaters promotes eutrophication in receiving waterways. A cost-effective method such as use of novel low-cost adsorbents for its adsorptive removal would significantly reduce such impacts. Using batch experiments, the intrinsic dynamics of P adsorption by waste alum sludge (an inevitable by-product of drinking water treatment plants)was examined. Different models of adsorption were used to describe equilibrium and kinetic data, calculate rate constants and determine the adsorption capacity. demonstrates that alum sludge -hitherto thought of as undesirable waste, can be used as novel adsorbent for P removal from wastewater through various applications, thus offsetting a portion of the disposal costs while at the same time improving water quality in sensitive watersheds.

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Section: [Insert Fig 2 Here] [Insert Table 1 Here]mentioning

confidence: 96%

“…The positive values of constant 'a' in the Fumkin model indicate that there is attractive interaction between the adsorbed species [23], i.e. the phosphate molecules and the alum sludge.…”

Section: [Insert Fig 2 Here] [Insert Table 1 Here]mentioning

confidence: 99%

Equilibrium and kinetic analysis of phosphorus adsorption from aqueous solution using waste alum sludge

Babatunde

Zhao

2010

Journal of Hazardous Materials

126

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“…For example, modification by the alkali treatment process is less energy intensive than biosorbent treatments that require high temperatures to produce activated carbon (e.g., activated carbon from apricot [40] and sago waste carbon [41]. Less intensive processing requirements for SKOH suggests potentially lower expenses in the use of this biosorbent.…”

Section: Adsorption Isothermmentioning

confidence: 99%

Adsorption of methylene blue from aqueous solution using untreated and treated (Metroxylon spp.) waste adsorbent: equilibrium and kinetics studies

et al. 2016

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Background (Metroxylon spp.) waste is an inexpensive and abundantly available material with the characteristics of a good adsorbent for treating dye from wastewater. We studied the effectiveness of alkali and acid modification in enhancing the adsorption capacity of sago waste. The untreated and treated adsorbent was characterized by FTIR, elemental analysis and BET surface area. The capacity of each adsorbent to adsorb MB was evaluated at different pH values, adsorbent dosage and initial dye concentrations and contact time. Results According to the results obtained, alkali treatment more than doubled the sorption capacity of sago waste by increasing the porosity, surface area and number of adsorption sites. The alkali-treated material also adsorbed significantly more than many known biosorbents. The effects of the initial concentration of methylene blue, solution pH and adsorbent dosage on methylene blue removal are reported. Equilibrium data were best represented by the Langmuir isotherm model with adsorption capacities of 83.5, 212.8 and 36.82 mg/g for untreated, potassium hydroxide-treated and phosphoric acid-treated sago wastes, respectively. The kinetics of adsorption were best described by a pseudo-second-order model (R 2 = 0.999). Conclusions The alkali treatment of sago waste demonstrates the use of a low-cost agricultural waste and a simple modification process to produce an effective adsorbent for removing cationic dye from wastewater.

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“…(6), and Smith [27], Eq. (7), isotherm models were applied to the experimental adsorption data generated with a linearized form of the model [28][29][30][31] used when possible. In the equations, q is the mass of adsorbed chitosan per unit weight of PLGA particles, C e is the equilibrium concentration of chitosan remaining in the solution.…”

Section: Adsorption Isotherm Model Fittingmentioning

confidence: 99%

Understanding the adsorption mechanism of chitosan onto poly(lactide-co-glycolide) particles

Guo

Gemeinhart

2008

European Journal of Pharmaceutics and Biopharmaceutics

112

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Polyelectrolyte-coated nanoparticles or microparticles interact with bioactive molecules (peptides, proteins or nucleic acids) and have been proposed as delivery systems for these molecules. However, the mechanism of adsorption of polyelectrolyte onto particles remains unsolved. In this study, cationic poly(lactide-co-glycolide) (PLGA) nanoparticles were fabricated by adsorption of various concentrations of a biodegradable polysaccharide, chitosan (0-2.4 g/L), using oil-in-water emulsion and solvent evaporation techniques. The particle diameter, zeta-potential, and chitosan adsorption of chitosan coated PLGA nanoparticles confirmed the increase of polyelectrolyte adsorption. Five adsorption isotherm models (Langmuir, Freundlich, Halsey, Henderson and Smith) were applied to the experimental data in order to better understand the mechanism of adsorption. Both particle diameter and chitosan adsorption increased with chitosan concentration during adsorption. A good correlation was obtained between PLGA-chitosan nanoparticle size and adsorbed chitosan on the surface, suggesting the increased particle size was primarily due to the increased chitosan adsorption. The zeta-potential of chitosan-coated PLGA nanoparticles was positive and increased with chitosan adsorbed until a maximum value (+55 mV) was reached at approximately 0.4-0.6 g/L; PLGA nanoparticles had a negative zeta-potential (−20 mV) prior to chitosan adsorption. Chitosan adsorption on PLGA nanoparticles followed a multilayer adsorption behavior, although the Langmuir monolayer equation held at low concentrations of chitosan. The underlying reasons for adsorption of chitosan on PLGA nanoparticles were thought to be the cationic nature of chitosan, high surface energy and microporous non-uniform surface of PLGA nanoparticles.

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Applicability of the various adsorption models of three dyes adsorption onto activated carbon prepared waste apricot

Cited by 400 publications

References 26 publications

Equilibrium and kinetic analysis of phosphorus adsorption from aqueous solution using waste alum sludge

Equilibrium and kinetic analysis of phosphorus adsorption from aqueous solution using waste alum sludge

Adsorption of methylene blue from aqueous solution using untreated and treated (Metroxylon spp.) waste adsorbent: equilibrium and kinetics studies

Understanding the adsorption mechanism of chitosan onto poly(lactide-co-glycolide) particles

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