Kinetic evaluation of phenol/aniline mixtures adsorption from aqueous solutions onto activated carbon and hypercrosslinked polymeric resin (MN200)

Valderrama, César; Barios, Joan I.; Caetano, Michelle L.; Farrán, Adriana; Cortina, José Luis

doi:10.1016/j.reactfunctpolym.2009.11.003

Cited by 70 publications

(55 citation statements)

References 33 publications

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“…A similar relation of effective diffusion coefficient to pore and surface diffusion coefficients to Equation 16 have been shown by McKay and co-workers [50] and Valderrama and co-workers [58,64], where the Langmuir model was applied for the adsorption isotherms. In this work, with the effective diffusion coefficient ( ) determined from the homogeneous particle diffusion model and pore diffusion coefficient reported by Ocampo-Perez et al [9], and show the same order of magnitude of effective diffusion coefficients (in Table 2) but much lower than the according pore diffusion coefficients (in Table 3), which indicates a significant effect of surface diffusion on the micropore adsorption kinetics.…”

Section: Substituting Equations 14 and 15 Into Equation 13supporting

confidence: 55%

“…This has often been encountered on the Macronet hypercrosslinked polymeric adsorbents, indicating film diffusion affected adsorption kinetics despite that the external film diffusion resistance was claimed to be removed or minimised by sufficient external agitation [58,64]. Because of the pore structure of the these adsorbents with the macropores being much larger relative to the size of the adsorbate molecules, the adsorbate is speculated to experience film diffusion resistance not only on the external adsorbent surface but also inside the large macropores, i.e., a film exists between the bulk of the pore and the internal pore surface.…”

Section: Exploring Intraparticle Diffusionmentioning

confidence: 99%

“…where is the solid phase density of the adsorbent and will be taken as 1.15 and 1.57 g/cm 3 , respectively, for MN 200 and MN 500 from the literature [64,71]. Furthermore, surface diffusion will more greatly affect the micropore diffusion region where is close to the state of adsorption equilibrium; the derivative of over can be approximated as:…”

Section: Pore and Surface Diffusionmentioning

confidence: 99%

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Adsorption of pyridine from aqueous solutions by polymeric adsorbents MN 200 and MN 500. Part 2: Kinetics and diffusion analysis

Zhu

Moggridge

D’Agostino

2016

Chemical Engineering Journal

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Telephone: +44 (0)1223 334763Fax: +44 (0)1223 334796 2 AbstractThe adsorption kinetics of pyridine adsorption on Macronet adsorbents MN 200 and MN 500 from aqueous solution was investigated at various initial pyridine concentrations and temperatures. The Weber-Morris plots revealed the influence of both external film diffusion and intraparticle diffusion resistances. The two linear regions in Weber-Morris plots were attributed to macropore and micropore diffusion, which was associated to the bimodal pore size distribution of the adsorbents. New insights into the diffusion mechanisms were highlighted, with the proposed internal film diffusion resistance dominating into the macropore region, whereas homogeneous particle diffusion resistance describes diffusion in the micropore region. The importance of pore and surface diffusion in the micropores was noted in contributing to the observed diffusion kinetics. The pore diffusion coefficient was estimated from PFG (pulsedfield gradient) parameter and molecular diffusion coefficient of pyridine in bulk liquid. A greater contribution of the surface to the overall diffusion kinetics was found for MN 500 as inferred from a proposed calculation method, which agrees with its better adsorption performance. The overall findings highlight the effect of pore structure onto the diffusion mechanisms inside the pores and help to gain a better understanding into the adsorption kinetics of these Macronet adsorbents, which are promising materials for the removal of Nheterocyclic compounds from waste water.

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Section: Substituting Equations 14 and 15 Into Equation 13supporting

confidence: 55%

Section: Exploring Intraparticle Diffusionmentioning

confidence: 99%

Section: Pore and Surface Diffusionmentioning

confidence: 99%

See 1 more Smart Citation

Adsorption of pyridine from aqueous solutions by polymeric adsorbents MN 200 and MN 500. Part 2: Kinetics and diffusion analysis

Zhu

Moggridge

D’Agostino

2016

Chemical Engineering Journal

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“…The kinetic concept of a "Shell Progressive" mechanism can be described in terms of the concentration profile of a liquid reactant containing a solute advancing into a spherical bead of a partially saturated adsorbent (Valderrama et al 2010) In this model can be defined three cases and the relationship between adsorption time and degree of adsorption is given by the following equations (Schmuckler and Golstein 1977). When the fluid film controls:…”

Section: S1 Homogeneous Particle Diffusion Modelmentioning

confidence: 99%

Recovery of Ammonium by Powder Synthetic Zeolites from Wastewater Effluents: Optimization of the Regeneration Step

You

Valderrama

Querol

et al. 2017

Water Air Soil Pollut

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17Nitrogen recovery and valorisation is gaining interest due to the current need for nitrogen 18 removal, so it is of the great interest that ammonium selective sorbents be evaluated. In this 19 study, a zeolitic material synthesized from coal fly ash (Ze-Na) in sodium form as well as its 20 modification to potassium form (Ze-K) were evaluated as sorbent materials for the recovery of 21 ammonium from wastewater effluents. The sorption performance was assessed through three 22 consecutive sorption-desorption cycles reporting opposite behaviour in terms of ammonium 23 sorption capacity. Decreasing in the case of Ze-Na and to slightly increase for Ze-K due to 24 alkaline activation of zeolite surface. The maximum sorption capacities obtained were 109±4 mg 25 ManuscriptClick here to download Manuscript Alkaline regeneration_text and tables_revxy.docx Click here to view linked References 2 NH4/g and 33±1 mg NH4/g for Ze-Na and Ze-K, respectively. It is important to point out that in the 26 case of Ze-Na, the maximum sorbent capacity was obtained during the first sorption cycle 27 whereas in the case of Ze-K was obtained during the last working cycle due to the alkaline 28 regeneration. 29Kinetic studies showed that after every regeneration step, the sorption kinetics turns faster as 30 alkaline desorption increased the zeolite specific surface, thus increasing the size of porous and 31 enhancing the diffusion through the particle. Results obtained indicate that sorption capacity 32 decreased significantly after every working cycle using Ze-Na whereas Ze-K followed the 33 opposite behaviour despite its initial lower sorption capacity.

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“…The mathematical dependence of uptake q t of solids on t 1/2 is obtained if the desorption process is considered to be influenced by diffusion in the spherical solid and by convective diffusion in the metal solution (Valderrama et al 2010). The fractional approach to equilibrium changes is according to a function of (…”

Section: Kinetic Modellingmentioning

confidence: 99%

Experimental Study of Mobility and Kinetic Characterization of Trace Elements in Contaminated Sediments from a River Basin in Northern Peru

Yacoub

Miralles

Valderrama

2014

Human and Ecological Risk Assessment: An International Journal

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In the Jequetepeque basin (Peru), gold extraction activity has been performed in the last decades, leading to a release of metals and metalloids into the environment. Sediment samples were taken in the vicinity of two mines and analysed. Extraction of metals and metalloids from sediments was carried out using single extraction procedures, acidic (HNO 3 ), and complexation (EDTA) leaching, in order to determine the mobility of trace elements. Results indicated that acidic extraction at low pH values increased the leachability of trace elements. EDTA showed a higher bioavailability of metals in sediments that acidic extraction under similar pH conditions because of its greater leaching capacity. This is an important issue in view of risk assessment analysis. The highest extractability was observed for Cd in all sediments with up to 90% of extraction after 1 hour. The mobility index analysis indicated that faster kinetic leachability of some trace elements leads to a higher mobility in sediments, especially those near the active gold extraction mine. The ecological risk assessment suggested that the four river sediments were at high and very high risk levels, indicating that sediment contamination is an issue of environmental concern in the Jequetepeque basin of northern Peru.

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Kinetic evaluation of phenol/aniline mixtures adsorption from aqueous solutions onto activated carbon and hypercrosslinked polymeric resin (MN200)

Cited by 70 publications

References 33 publications

Adsorption of pyridine from aqueous solutions by polymeric adsorbents MN 200 and MN 500. Part 2: Kinetics and diffusion analysis

Adsorption of pyridine from aqueous solutions by polymeric adsorbents MN 200 and MN 500. Part 2: Kinetics and diffusion analysis

Recovery of Ammonium by Powder Synthetic Zeolites from Wastewater Effluents: Optimization of the Regeneration Step

Experimental Study of Mobility and Kinetic Characterization of Trace Elements in Contaminated Sediments from a River Basin in Northern Peru

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