Sorption of dye from aqueous solution by peat

HO, Y; McKay, Gordon

doi:10.1016/s1385-8947(98)00076-x

Cited by 776 publications

(941 citation statements)

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“…A pseudo-first-order kinetic model of Lagergren [20] is given as; lnðQ e À Q t Þ ¼ ln Q e À k 1 t; ð6Þ A pseudo-second-order kinetic model of Ho [21] is…”

Section: Adsorption Kineticmentioning

confidence: 99%

Removal of methylene blue from aqueous solutions by poly(2-acrylamido-2-methylpropane sulfonic acid-co-itaconic acid) hydrogels

Coşkun

Delibaş

2011

Polym. Bull.

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In this study, removal of methylene blue (MB) from aqueous solution by poly(AMPS-co-IA) hydrogels was examined by batch equilibration technique. The effects of monomer ratio, concentration of initiator and crosslinker, pH, adsorption time, initial dye concentration and adsorption temperature on the removal of MB were studied. The results show that the removal of MB was highly effected by preparation conditions of hydrogel. The maximum removal was observed at 10/90 IA/AMPS monomer ratio, 1.0% KPS, and 10.0% MBAAm concentrations. Removal of MB was strongly affected by pH. Pseudo-first-order, pseudo-second-order and intraparticle diffusion models were applied. It was concluded that adsorption of MB on hydrogel followed pseudo-second-order kinetics. It was found that the adsorption isotherm of the MB fit Langmuir-type isotherms. From the Langmuir equation, the adsorption capacity was found as 1,000 mg/g for MB dye. Thermodynamic parameters suggest that the adsorption is a typical physical process, spontaneous, and exothermic in nature. Ten adsorption-desorption cycles demonstrated that the hydrogels were suitable for repeated use without considerable change in adsorption capacity. The results revealed that this hydrogels have potential to be used as an adsorbent for the removal of MB from aqueous solution.

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“…A pseudo-first-order kinetic model of Lagergren [20] is given as; lnðQ e À Q t Þ ¼ ln Q e À k 1 t; ð6Þ A pseudo-second-order kinetic model of Ho [21] is…”

Section: Adsorption Kineticmentioning

confidence: 99%

Removal of methylene blue from aqueous solutions by poly(2-acrylamido-2-methylpropane sulfonic acid-co-itaconic acid) hydrogels

Coşkun

Delibaş

2011

Polym. Bull.

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“…In order to evaluate the kinetic mechanism that controls the Ni(II) biosorption process, pseudo-first-order and pseudosecond-order kinetic models were tested to interpret the experimental data [6,19]. The pseudo-first-order model and pseudo-second-order model parameters were evaluated by non-linear regression analysis using MATLAB Ò software (version 7.9; http://www.mathworks.com/products/ matlab).…”

Section: Biosorption Kinetics Modelingmentioning

confidence: 99%

Nickel(II) biosorption by Rhodotorula glutinis

Suazo-Madrid

Morales-Barrera

Aranda-García

et al. 2010

J Ind Microbiol Biotechnol

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The present study reports the feasibility of using Rhodotorula glutinis biomass as an alternative low-cost biosorbent to remove Ni(II) ions from aqueous solutions. Acetone-pretreated R. glutinis cells showed higher Ni(II) biosorption capacity than untreated cells at pH values ranging from 3 to 7.5, with an optimum pH of 7.5. The effects of other relevant environmental parameters, such as initial Ni(II) concentration, shaking contact time and temperature, on Ni(II) biosorption onto acetone-pretreated R. glutinis were evaluated. Significant enhancement of Ni(II) biosorption capacity was observed by increasing initial metal concentration and temperature. Kinetic studies showed that the kinetic data were best described by a pseudo-second-order kinetic model. Among the two-, three-, and four-parameter isotherm models tested, the Fritz-Schluender model exhibited the best fit to experimental data. Thermodynamic parameters (activation energy, and changes in activation enthalpy, activation entropy, and free energy of activation) revealed that the biosorption of Ni(II) ions onto acetone-pretreated R. glutinis biomass is an endothermic and non-spontaneous process, involving chemical sorption with weak interactions between the biosorbent and Ni(II) ions. The high sorption capacity (44.45 mg g(-1) at 25°C, and 63.53 mg g(-1) at 70°C) exhibited by acetone-pretreated R. glutinis biomass places this biosorbent among the best adsorbents currently available for removal of Ni(II) ions from aqueous effluents.

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“…Protein adsorption processes successfully fitted to the pseudo-first-order kinetic Lagergren model are described by Gómez et al [67]. Figure 6 shows the adsorption of ovalbumin by EX M 1607, Macro-Prep S and UNOsphere S in dependence of the time.…”

Section: Adsorption Isothermsmentioning

confidence: 98%

Adsorption and separation of proteins by a smectitic clay mineral

Ralla

Sohling²,

Riechers

et al. 2010

Bioprocess Biosyst Eng

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The adsorption of proteins by a smectitic clay mineral was investigated. The clay used in this study is a mixture of montmorillonite and amorphous SiO(2). Due to the high porosity the montmorillonite units are accessible for protein adsorption. The amorphous silica prevents the montmorillonite from swelling and allows column packing. Protein adsorption was performed at different pH under static conditions. Furthermore, static capacities were determined. The material reveals high adsorption capacities for proteins under static conditions (270-408 mg/g), whereby proteins are mainly adsorbed via electrostatic interactions. The Freundlich isotherm is suggested as an adsorption model. For desorption a pH shift was found to be most effective. Binding and elution of human serum albumin and ovalbumin were tested under dynamic conditions. Dynamic capacities of about 40 mg/g for ovalbumin at 764 cm/h were found. The clay mineral provides suitable properties for the application as cost-efficient, alternative separation material.

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Sorption of dye from aqueous solution by peat

Cited by 776 publications

References 0 publications

Removal of methylene blue from aqueous solutions by poly(2-acrylamido-2-methylpropane sulfonic acid-co-itaconic acid) hydrogels

Removal of methylene blue from aqueous solutions by poly(2-acrylamido-2-methylpropane sulfonic acid-co-itaconic acid) hydrogels

Nickel(II) biosorption by Rhodotorula glutinis

Adsorption and separation of proteins by a smectitic clay mineral

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