Biosorption of phenol and o-chlorophenol from aqueous solutions on to chitosan–calcium alginate blended beads

Nadavala, Siva Kumar; Kalyani, Swayampakula; Boddu, Veere M.; Krishnaiah, A.

doi:10.1016/j.jhazmat.2008.05.070

Cited by 150 publications

(107 citation statements)

References 31 publications

(30 reference statements)

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“…Among them, the pseudo fi rst-order equation, the pseudo second-order equation, and the Weber-Morris method are the most commonly used to describe adsorption kinetics of an adsorbate onto an adsorbent. When the adsorption process is determined by diffusion steps, the kinetics follows the pseudo-fi rst-order rate equation of Lagergren [21][22][23], (1) … where k 1 is the fi rst-order rate constant, Q e the amount of adsorbate adsorbed at equilibrium, and Q t the amount of adsorbate adsorbed at time t. The above equation can be transformed into the following formulation utilizing the integration:…”

Section: Kinetics Of Carboxymethyl Cross-linked Sewage Sludgementioning

confidence: 99%

“……where k 2 is the second-order rate constant, and the others are the same as in equation 1. This model is more likely to predict the kinetic behavior of adsorption with chemical adsorption being the rate-controlling step [22]. Integrating this equation for boundary conditions t = 0 (Q t = 0) to t (Q t = Q e ) and then linearizing leads to The second-order rate constants k 2 and Q e are determined from the slope and intercepts of the plot obtained by plotting t/Q t versus t. …”

Section: Kinetics Of Carboxymethyl Cross-linked Sewage Sludgementioning

confidence: 99%

“…In order to elucidate the adsorption mechanism of the CCS and ECSi for Cu (II), two important isotherms were selected in this study: the Langmuir and the Freundlich isotherm models [21][22][23]. The Langmuir model is obtained under the ideal assumption of a totally homogeneous adsorption surface and the adsorbate on the adsorbent with the monomolecular layer, whereas the Freundlich isotherm is suitable for a highly heterogeneous surface.…”

Section: Adsorption Isotherm Of Cu (Ii) On Ccsmentioning

confidence: 99%

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Preparation and Cu (II) Adsorption Characteristics of Carboxymethyl Cross-Linked Sewage Sludge

Wang

Zhang

2016

Pol. J. Environ. Stud.

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Sewage sludge was cross-linked with epichlorohydrin to increase its mechanical strength and applicability as an absorbent material. We investigated the effect of the conditions of the cross-linking reaction on the mechanical strength and Cu (II) adsorption capacity of epichlorohydrin cross-linking sewage sludge (ECS). Experimental results showed that cross-linking can raise signifi cantly the mechanical strength of sewage sludge. To improve the adsorption capacity of ECS, carboxymethyl cross-linked sewage sludge (CCS) with maximal adsorption capacity (65mg/g) for Cu (II) was synthesized from ECS by using chloroacetic acid as the etherifi cation agent. The experimental results showed that the adsorption properties of CCS for Cu (II) could best be described by the pseudo-second order model and Langmuir model, and the adsorption mechanism was ion exchange. Our data suggest that CCS is a promising absorbent for removal of heavy metals from wastewater.

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Section: Kinetics Of Carboxymethyl Cross-linked Sewage Sludgementioning

confidence: 99%

Section: Kinetics Of Carboxymethyl Cross-linked Sewage Sludgementioning

confidence: 99%

Section: Adsorption Isotherm Of Cu (Ii) On Ccsmentioning

confidence: 99%

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Preparation and Cu (II) Adsorption Characteristics of Carboxymethyl Cross-Linked Sewage Sludge

Wang

Zhang

2016

Pol. J. Environ. Stud.

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“…8 Some physicochemical and biological methods including adsorption, extraction by chemical solvents, air stripping, freezing and crystallization, chemical oxidation, wet oxidation, advanced oxidation processes, biological degradation biosorption, coagulation, chlorination and liquid membrane permeation have been developed for the removal of phenolic compounds from aqueous solutions. 6,7,9,[10][11][12][13] Among these methods, the ones used for the concentration of the chlorinated phenols on the solid phase are adsorption and ion exchange methods but they are not for complete mineralization. The ones used for complete mineralization and combination of chlorophenols are chemical or biological oxidation methods.…”

Section: Introductionmentioning

confidence: 99%

Biosorption of 2,4 dichlorophenol onto Turkish Sweetgum bark in a batch system: equilibrium and kinetic modeling

Yıldız¹,

Keskin²,

Demirak³

2017

ACSi

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In this study, Turkish Sweetgum bark was used as a new biosorbent to investigate the removal of hazardous 2,4 dichlorophenol (2,4-DCP) from aqueous solutions in batch biosoption experiments. The effective usage of Turkish sweetgum bark is a meaningful work for environmental utilization of agricultural residues. The effects of experimental parameters like solution pH, contact time, initial concentration of adsorbate and amount of bisorbent dosage were investigated in a series of batch studies at 25 °C. Taguchi's Orthogonal Array (OA) analysis was used to find the best experimental parameters for the optimum design process in this study. The functional groups and surface properties of biosorbent were characterized by using Fourier transformer infrared (FTIR) and scanning electron microscopy (SEM) techniques. The experimental data were fitted to Langmuir isotherm and Freundlich isotherm models. There is a good agreement between the parameters and this confirms the monolayer adsorption of 2,4-DCP onto sweetgum bark. As a result of kinetic studies, the pseudo-second-order kinetic model was found to be suitable for all the data. Also, the results of the study show that Turkish Sweetgum bark can be potential as a low-cost alternative commercial adsorbents for removal 2,4 dichlorophenol from aqueous solutions.

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“…Many biosorbents have been studied, for example, Spirulina sp. (Dotto et al, 2013), Aspergillus niger (Rao and Viraraghavan, 2002), fungal mycelia (Wu and Yu, 2006), marine seaweeds (Navarro et al, 2008), Funaliat rogii (Bayramoglu et al, 2009), chitosan (Nadavala et al, 2009) and Phanerochaete chrysosporium (Farkas et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study for the Treatment of Refinery Synthetic Wastewater Containing Phenol

Altaher¹,

Ashour²,

Sawalha³

et al. 2015

Science, Technology and Development

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Abstract:In this study, removal of phenol which is classified as priority pollutant by US EPA, was experimentally investigated using different removal techniques including; adsorption using Granular Activated Carbon (GAC), biodegradation using six different active phenol uptaking bacteria, combined GAC sorption and biodegradation (Biological Activated Carbon, BAC) and GAC coupled with inactive bacteria (biosorption). A solution of 100 mg LG 1 phenol at room temperature was considered as the wastewater. The study was performed in the temperature range 25-30°C. The results of these different techniques revealed that activated carbon sorption is better than the other methods in removing phenol. The removal efficiency of this technique reached a value of 97% corresponding to residual phenol concentration of 3 mg LG 1 . The equilibrium sorption was reached after 48 h of contact. The adsorption data was better fitted to Langmuir model with adsorption capacity of 90 mg gG 1 . The adsorption was found to be second order with both intraparticle diffusion and film diffusion to control the adsorption process. The least effective removing method of phenol was the biodegradation using active bacteria alone. The residual concentration of phenol attained by this method was 17 mg LG 1 . According to the results of this study approximately 80% of the overall biological activity for removal of phenol was due to the surface sorption on the cell wall, whereas, about 20% of this activity was due to biodegradation.

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Biosorption of phenol and o-chlorophenol from aqueous solutions on to chitosan–calcium alginate blended beads

Cited by 150 publications

References 31 publications

Preparation and Cu (II) Adsorption Characteristics of Carboxymethyl Cross-Linked Sewage Sludge

Preparation and Cu (II) Adsorption Characteristics of Carboxymethyl Cross-Linked Sewage Sludge

Biosorption of 2,4 dichlorophenol onto Turkish Sweetgum bark in a batch system: equilibrium and kinetic modeling

A Comparative Study for the Treatment of Refinery Synthetic Wastewater Containing Phenol

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