Competitive adsorption of two dissolved organics onto activated carbon—I

Fritz, Wolfgang; Schlünder, Ernst‐Ulrich

doi:10.1016/0009-2509(81)85088-9

Cited by 171 publications

(61 citation statements)

References 8 publications

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“…Moreover, agricultural adsorbents display heterogeneity (Gupta and Ali, 2004). Such observation was also reported by Fritz and Schlűnder (1981). The intensity of adsorption (1/n), lies between 0 and 1, which implies stronger interaction between the pine sawdust and the cobalt (II) ions (Site, 2001).…”

Section: Discussionsupporting

confidence: 60%

Cobalt removal from wastewater using pine sawdust

Musapatika

Singh

Moodley

et al. 2012

Afr. J. Biotechnol.

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Agricultural wastes can cause environmental problems if not well managed, but there is a lot of potential to use these wastes as raw material in other processes. In this investigation, pine sawdust was evaluated as an adsorbent in the treatment of wastewater containing cobalt ions. A two-level threefactor full-factorial experimental design with centre points was used to study the interactive effect of the operating parameters in order to achieve the best conditions for the batch adsorption of cobalt ions. A response surface analysis was also conducted to further understand the interactions amongst the factors such as adsorbent dose, solution pH and initial concentration. In addition, adsorption isotherms, namely the Freundlich and Langmuir, were used to characterize the removal of cobalt from the wastewater. It was observed that the combined effect of low adsorbent dose, high pH and high initial concentration of wastewater resulted in the highest adsorption capacity. The Freundlich isotherm provided a better fit to the experimental data than the Langmuir isotherm. Moreover, pine sawdust showed adsorption capabilities for cobalt, and hence it could be an option in the quest to use waste to treat wastewater.

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Section: Discussionsupporting

confidence: 60%

Cobalt removal from wastewater using pine sawdust

Musapatika

Singh

Moodley

et al. 2012

Afr. J. Biotechnol.

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“…In the micropores, the size of diffusing molecules becomes comparable to that of the pore and molecule-wall collisions become the dominant effect, which significantly slows down the overall diffusion processes. In such a case, the diffusion mechanism can be ascribed to a surface diffusion process [74,75]. Surface diffusion can be treated as an independent flow in addition to pore diffusion in the bulk void of the adsorbent in contributing to the overall flux of the adsorbate [46,75], which will be more prominent in the micropores, where the motion of the adsorbate is more affected by the pore walls.…”

Section: Pore and Surface Diffusionmentioning

confidence: 99%

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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“…Other researchers have also found the PSDM useful in simulating adsorption systems in various situations (e.g. Fritz et al, 1980;Zimmer et al, 1988;Hand et al, 1989;Magnuson and Speth, 2005;Hristovski et al, 2008a and2008b). By accounting for both pore and surface diffusion, the PSDM is referred to as "the most comprehensive mass transfer model" by Hand et al (1997) and has been utilized to model an array of systems including newer technologies such as sorption of arsenate with zirconium oxide-based media in Hristovski et al (2008b).…”

Section: Mathematical Modeling Of Adsorptionmentioning

confidence: 99%

“…Other researchers have found the PSDM useful in accurately simulating various sorption systems to fit breakthrough curves (e.g., Fritz et al, 1980;Zimmer et al, 1988;Hand et al, 1989;Hristovski et al, 2008). Many of the properties for contaminants and their parameters were obtained from StEPP™ (Hokanson et al, 1999b), a chemical database created specifically for use with AdDesignS TM .…”

Section: Sorption Modelingmentioning

confidence: 99%

Framework for Evaluating Sorbent Usage Rate of Various Sorption Column Configurations with and without Bypass Blending

et al. 2013

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Sorption systems are a prevalent technology in the field of environmental engineering for treating waters contaminated with organic and/or inorganic compounds. Examples of such contaminants include taste and odor, hardness, disinfection byproduct precursors, and arsenic.The primary operating costs for these sorption systems lie in sorbent replacement. Different column arrangements and the use of bypass blending have the potential to reduce sorbent usage. Thus, this research aimed to develop a decision framework to assist engineers and practitioners in considering when to apply single columns, parallel columns, and lead-lag series configurations, with and without bypass, based on sorbent usage rate. This framework utilized two parameters that were found to influence the overall performance of each configuration option. These parameters were a normalization of the breakthrough curve, expressed as a ratio of the mass transfer zone length to the lag length (MTZ:Lag), and the normalized treatment objective (C/Co). Based on these parameters, comparisons of the performance of various configurations, both with and without bypass, could be developed.The following conclusions were formed based on this research:• Systems operated at low MTZ:Lag ratios have the ability to yield significant savings in sorbent usage with the use of bypass over arrangements without bypass in single column or lead-lag arrangements.• Systems with high MTZ:Lag ratios can benefit from the use of a lead-lag series configuration to increase column bed life and reduce sorbent usage rate, with or without bypass.• Parallel column configurations can offer significant savings in sorbent usage, particularly in systems with higher treatment objectives and high MTZ:Lag ratios.• Single column configurations without bypass remain competitive with other configurations for systems with low MTZ:Lag ratios (< about 0.5) and low treatment objectives (<0.2). ACKNOWLEDGEMENTS

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Competitive adsorption of two dissolved organics onto activated carbon—I

Cited by 171 publications

References 8 publications

Cobalt removal from wastewater using pine sawdust

Cobalt removal from wastewater using pine sawdust

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

Framework for Evaluating Sorbent Usage Rate of Various Sorption Column Configurations with and without Bypass Blending

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