Equilibrium Isotherm Studies of Adsorption of Pigments Extracted from Kuduk-kuduk (<i>Melastoma malabathricum</i>L.) Pulp onto TiO<sub>2</sub>Nanoparticles

Thotagamuge, Roshan; Hamdan, Nurulhayah; Petra, Mohammad Iskandar; Tennakoon, Kushan U.; Ekanayake, Piyasiri

doi:10.1155/2014/468975

Cited by 94 publications

(34 citation statements)

References 30 publications

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“…However, the values of the maximum adsorption capacity obtained using the Sips model are comparable to that obtained by nonlinear Langmuir equation and have the same order (2 nitrophenol > 2,4 dinitrophenol and 4 nitrophenol). When n s = 1, the Sips equation reduces to the Langmuir equation (Kumara et al 2014).…”

Section: Three-parameter Isothermmentioning

confidence: 99%

Removal of three nitrophenols from aqueous solutions by adsorption onto char ash: equilibrium and kinetic modeling

2018

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In this research, the removal of 2,4 dinitrophenol, 2 nitrophenol and 4 nitrophenol from aqueous solution using char ash from animal bones was investigated using batch technique. Three 2-parameter isotherms (Freundlich, Langmuir, and Temkin) were applied to analyze the experimental data. Both linear and nonlinear regression analyses were performed for these models to estimate the isotherm parameters. Three 3-parameter isotherms (Redlich-Peterson, Sips, Toth) were also tested. Moreover, the kinetic data were tested using pseudo-first order, pseudo-second order, Elovich, Intraparticle diffusion and Boyd methods. Langmuir adsorption isotherm provided the best fit for the experimental data indicating monolayer adsorption. The maximum adsorption capacity was 8.624, 7.55, 7.384 mg/g for 2 nitrophenol, 2,4 dinitrophenol, and 4 nitrophenol, respectively. The experimental data fitted well to pseudo-second order model suggested a chemical nature of the adsorption process. The R 2 values for this model were 0.973 up to 0.999. This result with supported by the Temkin model indicating heat of adsorption to be greater than 10 kJ/mol. The rate controlling step was intraparticle diffusion for 2 nitrophenol, and a combination of intraparticle diffusion and film diffusion for the other two phenols. The pH and temperature of solution were found to have a considerable effect, and the temperature indicated the exothermic nature of the adsorption process. The highest adsorption capacity was obtained at pH 9 and 25 °C.

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Section: Three-parameter Isothermmentioning

confidence: 99%

Removal of three nitrophenols from aqueous solutions by adsorption onto char ash: equilibrium and kinetic modeling

2018

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“…The dimensionless heterogeneity factor 1/ n describes the heterogeneity of the material because 0.8025 is between 0 and 1. The value of 1/ n < 1 is related to the adsorption intensity constant that varies with the heterogeneity of the adsorbate . The adsorptive capacity was 40.11 mg g −1 for the removal of atrazine onto MBo.…”

Section: Resultsmentioning

confidence: 99%

Magnetic sugarcane bagasse composite for atrazine and fluoride removal

Helen

Blanco-Flores

López-Téllez

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: The present investigation focuses on the synthesis and application of a magnetic adsorbent material formed by the agro-industrial waste sugarcane bagasse (SCB). Its application in the removal of fluoride and atrazine demonstrates its properties as a potential adsorbent material for the treatment of contaminated wastewater. RESULTS:The synthesis method proved to be simple and reproducible. The presence and distribution of magnetite and fluoride on the surface of the material were studied by characterization techniques (SEM, EDX, FTIR-ATR). Several specific functional groups were identified which may interact with atrazine and fluoride molecules in the adsorption process. Kinetic results indicated that second-and pseudo-second-order model fitted better for the fluoride and atrazine adsorption processes, respectively. The adsorption processes took place by chemisorption onto heterogeneous surfaces. Isotherm data fitted better to the Langmuir-Freundlich model in both systems; therefore, the process took place by a combination of mechanisms. Cellulose and lignin from sugarcane bagasse contribute in the adsorption process, while magnetite not only improve performance of composite for the removal of the chemical species tested, but also achieve a simple separation process via magnetic interactions' with a common magnet. The adsorption capacities of the composites were 0.5036 mg g −1 for fluoride and 40.11 mg g −1 for atrazine. CONCLUSION: The synthesis of the magnetic composite is simple and generates a material that is easy to manipulate and isolate after the process. The affinity of the composite with atrazine is greater than with fluoride; however, the composite can be used in systems with low concentration.

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“…where K R , a R and b are constants. Previous studies have shown that it is more accurate than the Langmuir and the Freundlich models, because it contains three tuning parameters (Kumara et al 2014).…”

Section: Adsorption Tests Of the Synthesized Magnetic Polymer Beadsmentioning

confidence: 99%

Application of ion-exchange resin beads to produce magnetic adsorbents

et al. 2020

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Heavy metal ions are among the most dangerous contaminants, which can cause serious health problems. In this work, ion-exchange resin beads were used as supports for magnetite (Fe3O4) synthesis to produce heavy metal adsorbents which can be easily separated by magnetic field. The first step of the magnetite preparation was the replacement of hydrogen ions with Fe2+ and Fe3+ ions on the sulfonic acid groups of the resin. In the second step, magnetite particle formation was induced by coprecipitating the iron ions with sodium hydroxide. The regeneration of the ion-exchange resin was also carried out by using sodium hydroxide. SEM images verified that relatively large magnetite crystal particles (diameter = 100–150 nm) were created. The ion-exchange effect of the prepared magnetic adsorbent was also confirmed by applying Cu2+, Ni2+, Pb2+ and Cd2+ ions in adsorption experiments.

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Equilibrium Isotherm Studies of Adsorption of Pigments Extracted from Kuduk-kuduk (Melastoma malabathricumL.) Pulp onto TiO₂Nanoparticles

Cited by 94 publications

References 30 publications

Removal of three nitrophenols from aqueous solutions by adsorption onto char ash: equilibrium and kinetic modeling

Removal of three nitrophenols from aqueous solutions by adsorption onto char ash: equilibrium and kinetic modeling

Magnetic sugarcane bagasse composite for atrazine and fluoride removal

Application of ion-exchange resin beads to produce magnetic adsorbents

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Equilibrium Isotherm Studies of Adsorption of Pigments Extracted from Kuduk-kuduk (Melastoma malabathricumL.) Pulp onto TiO2Nanoparticles

Cited by 94 publications

References 30 publications

Removal of three nitrophenols from aqueous solutions by adsorption onto char ash: equilibrium and kinetic modeling

Removal of three nitrophenols from aqueous solutions by adsorption onto char ash: equilibrium and kinetic modeling

Magnetic sugarcane bagasse composite for atrazine and fluoride removal

Application of ion-exchange resin beads to produce magnetic adsorbents

Contact Info

Product

Resources

About

Equilibrium Isotherm Studies of Adsorption of Pigments Extracted from Kuduk-kuduk (Melastoma malabathricumL.) Pulp onto TiO₂Nanoparticles