Cited by 121Adsorption and biosorption for pollutant removalWater Treatment and DisinfectionEnvironmental remediation with nanomaterials

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Characteristics of competitive adsorption between 2-methylisoborneol and natural organic matter on superfine and conventionally sized powdered activated carbons

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Abstract

When treating water with activated carbon, natural organic matter (NOM) is not only a target for adsorptive removal but also an inhibitory substance that reduces the removal efficiency of trace compounds, such as 2-methylisoborneol (MIB), through adsorption competition. Recently, superfine (submicron-sized) activated carbon (SPAC) was developed by wet-milling commercially available powdered activated carbon (PAC) to a smaller particle size. It was reported that SPAC has a larger NOM adsorption capacity than PAC because NOM mainly adsorbs close to the external adsorbent particle surface (shell adsorption mechanism). Thus, SPAC with its larger specific external surface area can adsorb more NOM than PAC. The effect of higher NOM uptake on the adsorptive removal of MIB has, however, not been investigated. Results of this study show that adsorption competition between NOM and MIB did not increase when NOM uptake increased due to carbon size reduction; i.e., the increased NOM uptake by SPAC did not result in a decrease in MIB adsorption capacity beyond that obtained as a result of NOM adsorption by PAC. A simple estimation method for determining the adsorbed amount of competing NOM (NOM that reduces MIB adsorption) is presented based on the simplified equivalent background compound (EBC) method. Furthermore, the mechanism of adsorption competition is discussed based on results obtained with the simplified EBC method and the shell adsorption mechanism. Competing NOM, which likely comprises a small portion of NOM, adsorbs in internal pores of activated carbon particles as MIB does, thereby reducing the MIB adsorption capacity to a similar extent regardless of adsorbent particle size. SPAC application can be advantageous because enhanced NOM removal does not translate into less effective removal of MIB. Molecular size distribution data of NOM suggest that the competing NOM has a molecular weight similar to that of the target compound.

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  • Physical pore blockages from suspended sediment would result in fewer interactions between PFAS and the RemBindTM surfaces.

    “Physical pore blockages from suspended sediment would result in less interactions between PFAS and the RemBind™ surfaces.43”

    From Evaluation of sorbents and matrix effects for treating heavy metals and per- and polyfluoroalkyl substances as co-contaminants in stormwater (2023) · cites this paper as [43]

    The Introduction describes pore blockage or constriction at high natural-organic-matter loadings as a mechanism that reduces micropollutant adsorption on activated carbon. It does not establish that suspended sediment blocks RemBind™ pores or reduces PFAS interactions with its surfaces. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • The higher temperatures used to create GAC, as compared to biochar, result in smaller pores that can be clogged by suspended sediment.

    “The higher temperatures used to create GAC (as compared to biochar) result in smaller pores that can be clogged by suspended sediment.43”

    From Evaluation of sorbents and matrix effects for treating heavy metals and per- and polyfluoroalkyl substances as co-contaminants in stormwater (2023) · cites this paper as [43]

    The Activated carbon section (page not provided) describes thermally activated powdered carbon, while the Introduction discusses tailoring granular activated carbon for odorant removal. Neither addresses biochar, comparative production temperatures, or pores clogged by suspended sediment. Searches for those terms found no passage supporting the attributed claim. (LLM, conf=0.76)

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Research works printed but not linked: 34

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Metadata

Authors
Matsui, Y., Yoshida, T., Nakao, S., Knappe, D. R. U., & Matsushita, T.
Affiliations
  • Hokkaido University (JP)
  • North Carolina State University (US)
Corresponding author
Matsui, Yoshihiko
Venue
Water Research
Publisher
Elsevier BV
Published
2012-10
Volume
46
Issue
15
Pages
4741-4749
ISSN
0043-1354 (ISSN-L)
OpenAlex
W1979788021
Cited by
121
References
0
Citations by year
2026: 8 · 2025: 7 · 2024: 5 · 2023: 5 · 2022: 7 · 2021: 13 · 2020: 12 · 2019: 9 · 2018: 11 · 2017: 9 · 2016: 11 · 2015: 12 · 2014: 8 · 2013: 3
FWCI
6.24
Type
journal article
Language
en
Open access
Locations
  • Water Research (publishedVersion)
  • PubMed (publishedVersion)
  • Institutional Repositories DataBase (IRDB) (submittedVersion)
  • Hokkaido University Collection of Scholarly and Academic Papers (Hokkaido University) (submittedVersion)
Funders
  • Ministry of Health, Labour and Welfare
  • Japan Society for the Promotion of Science (24226012)
Topics
  • Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Water Treatment and Disinfection
  • Physical Sciences › Environmental Science › Environmental Engineering › Environmental remediation with nanomaterials
Keywords
2-methylisoborneol, natural organic matter, competitive adsorption, powdered activated carbon, particle size reduction, molecular size distribution, water treatment, disinfection by-product precursors
MeSH terms
Adsorption, Camphanes, Carbon, Powders

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