An adsorption diffusion model for removal of para-chlorophenol by activated carbon derived from bituminous coal

Sze, M.F.F.; McKay, Gordon

doi:10.1016/j.envpol.2009.12.003

Cited by 55 publications

(27 citation statements)

References 36 publications

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“…The final plateau stage is related to the final equilibrium process [3]. Similar trend has been observed by Sze and McKay in the adsorption of p-chlorophenol by activated carbon derived from bituminous coal [7]. On the basis of the obtained intercept, the line of intraparticle diffusion plot did not pass through the origin (y = 2.7433x + 26.772), suggesting that the intraparticle diffusion or diffusion into the pores was not the sole rate-limiting stage.…”

Section: Kinetic Studysupporting

confidence: 67%

“…Phenolic compounds can be accumulated in the environment, which can cause unpleasant taste and odor [2,5,6]. Chlorophenols are a group of phenolic compounds with chlorine atoms attached to the phenolic ring, which are widely used to synthesize herbicides, insecticides, and wood preservatives [7]. Many technologies have been applied for the removal of phenolic compounds in aqueous phase, including advanced oxidation processes, biological processes, electrochemical oxidation, reverse osmosis, and adsorption process [3,8].…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

“…(2015) [1][2][3][4][5][6][7][8][9][10][11][12][13][14] www.deswater.com doi: 10.1080/19443994.2015.1067830 priority pollutants. Phenolic compounds can be accumulated in the environment, which can cause unpleasant taste and odor [2,5,6].…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

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Optimized adsorption of 4-chlorophenol onto activated carbon derived from milk vetch utilizing response surface methodology

Noorimotlagh

Shahriyar

Soltani

et al. 2015

Desalination and Water Treatment

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In the present study, the adsorption of 4-chlrorophenol (4-CP) from aqueous solutions was investigated using activated carbon prepared from milk vetch. Scanning electron microscopy, Brunauer-Emmett-Teller, and Fourier transform infrared were carried out to characterize as-prepared activated carbon. The adsorption process was optimized by response surface methodology based on central composite design. Accordingly, a 4-CP removal of 89.52% was obtained with a reaction time of 49 min, initial 4-CP concentration of 56 mg/L, adsorbent dosage of 1 g/L, and initial pH of 7. Among various operational parameters, the adsorbent dosage (F-value = 139.5) produced the largest effect on 4-CP removal (%), while initial pH (F-value = 0.620) presented the lowest effect. The pseudo-second-order kinetic equation described the process reasonably well (R 2 = 0.9996). The process followed Langmuir isotherm (R 2 = 0.9969) with a maximum adsorption capacity of about 87 mg/g. For chemical regeneration, during three-stage regeneration runs, the removal efficiency (%) of 4-CP decreased from 87.45 to 61.15%, while, in the case of thermal regeneration, it decreased from 87.45 to 77.68%, respectively. Overall, activated carbon derived from milk vetch can be applied as an efficient adsorbent for sequestering 4-CP from aqueous phase with relatively high reusability potential.

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Section: Kinetic Studysupporting

confidence: 67%

Section: Desalination and Water Treatmentmentioning

confidence: 99%

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Optimized adsorption of 4-chlorophenol onto activated carbon derived from milk vetch utilizing response surface methodology

Noorimotlagh

Shahriyar

Soltani

et al. 2015

Desalination and Water Treatment

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“…They have been used worldwide as broad spectrum biocides in domestic, agricultural and industrial contexts [2]. Chlorophenols also found applications in extraction of sulfur and nitrogen compounds from coal [3], as wood preservatives, antiseptics (especially, 4-chlorophenol) [4] and as intermediate substances for the synthesis of many products such as highly chlorinated phenols (from mono and dichlorophenols), herbicides (in particular, phenoxyacetic acids), disinfectants, dyes, pharmaceuticals [5] and phenolic resins [6].…”

Section: Introductionmentioning

confidence: 99%

“…The removal of chlorophenols from water and wastewater has been done using a significant number of processes [13], such as liquid-liquid extraction [7], membrane extraction [14], pervaporation, solid-liquid adsorption [15,4,3,16,17], chemical processes (e.g., advanced oxidation process) [18] and biochemical methods based on microorganisms and enzymes [13].…”

Section: Introductionmentioning

confidence: 99%

Prediction of diffusion coefficients of chlorophenols in water by computer simulation

Martins

Parreira

Ramalho

et al. 2015

Fluid Phase Equilibria

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A B S T R A C TIntra-diffusion coefficients of seven chlorophenols (2-chlorophenol, 3-chlorophenol, 4-chlorophenol, 2,4-dichlorophenol, 2,6-dichlorophenol, 2,4,6-dichlorophenol and pentachlorophenol) in water were determined by computer simulation (molecular dynamics) for dilute solutions at three different temperatures and the corresponding mutual diffusion coefficients estimated. The mutual diffusion coefficients of 2-chlorophenol in water agree with the available experimental results from the literature for all the temperatures studied. From the dependence of the diffusion coefficients on temperature, diffusion activation energies were estimated for all the solutes in water. Analyzing the radial distribution functions and spatial distribution functions of water around chlorophenols sites enable a discussion about intermolecular interactions (dominated by hydrogen bonding) between solute and solvent and its importance on the relative magnitude of diffusion coefficients. Finally the mutual diffusion coefficients obtained by simulation were correlated by the well-known Wilke-Chang equation.

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Adsorption Kinetics of Chloroform from Aqueous Solutions onto Activated Lignite

Tongur

Aydın

2012

CLEAN Soil Air Water

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The lignite coal researched by this study was subjected to a two-stage activation process performed in the scope of obtaining active carbon from domestic resources. ''Activation'' and ''carbonization'' stages were used in the experiments. The modified lignite was produced by impregnating lignite with KOH and washing the activation product with 15% HCl solution after thermal treatment. Increasing KOH dosage also increased the removal efficiency. The variables investigated in adsorption experiments were contact time, initial concentration, pH, and sorbent dosage. Adsorption kinetics was fitted by using the pseudo-first-order equation, pseudo-second-order equation, and intra-particle diffusion. Isotherm modeling was carried out using Langmuir, Freundlich, and Dubinin-Radushkevich equations. Selected target compound in this work is common environmental pollutant in waters. A commonly known effect of chloroform is its carcinogenic effect. Therefore, removal of these compounds from water is considerably important. Chloroform removal of 97% for was achieved by the use of Konya region activated lignite.Abbreviations: IR, infrared; SEM, scanning electron microscope 32

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An adsorption diffusion model for removal of para-chlorophenol by activated carbon derived from bituminous coal

Cited by 55 publications

References 36 publications

Optimized adsorption of 4-chlorophenol onto activated carbon derived from milk vetch utilizing response surface methodology

Optimized adsorption of 4-chlorophenol onto activated carbon derived from milk vetch utilizing response surface methodology

Prediction of diffusion coefficients of chlorophenols in water by computer simulation

Adsorption Kinetics of Chloroform from Aqueous Solutions onto Activated Lignite

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