Competitive adsorption of micropollutants and NOM onto activated carbon: comparison of different model approaches

Worch, Eckhard

doi:10.2166/aqua.2010.065

Cited by 31 publications

(8 citation statements)

References 16 publications

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“…This can be attributed to the comparably constant DOC concentrations, which influence competition for adsorption sites (Worch, 2010) and is in line with lab-scale adsorption experiments conducted with differing initial OMP concentrations under identical DOM background conditions (Matsui et al, 2003). The removals appear to be most steady at high PAC doses and for well-adsorbing OMPs.…”

Section: Micropollutantssupporting

confidence: 76%

Integrating organic micropollutant removal into tertiary filtration: Combining PAC adsorption with advanced phosphorus removal

2015

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Section: Micropollutantssupporting

confidence: 76%

Integrating organic micropollutant removal into tertiary filtration: Combining PAC adsorption with advanced phosphorus removal

2015

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“…If the values of B and nT were determined, the CT/C0 value of the tracer from NOM bearing water could be calculated at any adsorbent mass, in contrast to the EBC model above. This model is in good agreement with the previous studies, and the advantages and limitations of SEBC model were given in previous literature [5,32,33].…”

Section: Modeling For Competing Nom Analysissupporting

confidence: 91%

TiO2-Powdered Activated Carbon (TiO2/PAC) for Removal and Photocatalytic Properties of 2-Methylisoborneol (2-MIB) in Water

Xia-zhen

Zang

et al. 2021

Water

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2-methylisoborneol (2-MIB) is a common taste and odor compound caused by off-flavor secondary metabolites, which represents one of the greatest challenges for drinking water utilities worldwide. A TiO2-coated activated carbon (TiO2/PAC) has been synthesized using the sol-gel method. A new TiO2/PAC photocatalyst has been successfully employed in photodegradation of 2-MIB under UV light irradiation. In addition, the combined results of XRD, SEM-EDX, FTIR and UV-Vis suggested that the nano-TiO2 had been successfully loaded on the surface of PAC. Experimental results of 2-MIB removal indicated that the adsorption capacities of PAC for 2-MIB were higher than that of TiO2/PAC. However, in the natural organic matter (NOM) bearing water, the removal efficiency of 2-MIB by TiO2/PAC and PAC were 97.8% and 65.4%, respectively, under UV light irradiation. Moreover, it was shown that the presence of NOMs had a distinct effect on the removal of MIB by TiO2/PAC and PAC. In addition, a simplified equivalent background compound (SEBC) model could not only be used to describe the competitive adsorption of MIB and NOM, but also represent the photocatalytic process. In comparison to other related studies, there are a few novel composite photocatalysts that could efficiently and rapidly remove MIB by the combination of adsorption and photocatalysis.

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“…Rather than focusing on the chemical distinctions among different NOM fractions, some researchers have used adsorption directly to characterize the fractions. − In this approach, the NOM is represented as a mixture of several “fictive” components that compete for the available surface sites. The components are assigned adsorptive properties that, when considered in conjunction with a specific model for competitive adsorption, cause the overall NOM adsorption computed using the model to mimic the experimental findings, without ascribing any particular molecular properties to the different components.…”

Section: Introductionmentioning

confidence: 99%

Insights and Model for Understanding Natural Organic Matter Adsorption onto Mixed Adsorbents

Modarresi

Benjamin

2018

Environ. Sci. Technol.

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Adsorption-based processes are commonly used to remove natural organic matter (NOM) from drinking water sources and thereby mitigate its impacts on other water treatment processes and the quality of the finished water. These processes are complicated by the fact that NOM comprises multiple fractions that can exhibit disparate adsorption behaviors. Prior modeling of NOM adsorption has invariably focused on systems with a single adsorbent, but results presented here demonstrate surprising and counterintuitive behavior in systems containing two or more adsorbents. Specifically, if the sequence of affinities of the different NOM fractions are the same for two adsorbents, then overall adsorption changes monotonically as one adsorbent is gradually replaced by the other. However, if the sequence differs for the two adsorbents, overall adsorption can increase even when the nominally stronger adsorbent is gradually replaced by the weaker one. This work demonstrates and explains such behavior for a particular mixture of adsorbents and introduces a mathematical model that illustrates how other mixtures might behave.

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Competitive adsorption of micropollutants and NOM onto activated carbon: comparison of different model approaches

Cited by 31 publications

References 16 publications

Integrating organic micropollutant removal into tertiary filtration: Combining PAC adsorption with advanced phosphorus removal

Integrating organic micropollutant removal into tertiary filtration: Combining PAC adsorption with advanced phosphorus removal

TiO2-Powdered Activated Carbon (TiO2/PAC) for Removal and Photocatalytic Properties of 2-Methylisoborneol (2-MIB) in Water

Insights and Model for Understanding Natural Organic Matter Adsorption onto Mixed Adsorbents

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