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Peer-reviewedCC BY-NC-NDBMC research notes

Extended evaluation of activated carbon-embedded glucomannan membranes for the adsorption of structurally and charge-distinct dyes.

  • Masahide Hagiri1,2
  • Taisei Igari3
  • Keita Kashima4
4 affiliations
  1. 1Department of Chemistry and Materials Science, Gunma College, National Institute of Technology, 580, Toribamachi, Maebashi, Gunma, 371-8530, Japan. [email protected].
  2. 2Department of Applied Chemistry and Biochemistry, Fukushima College, National Institute of Technology, Nagao 30, Kamiarakawa, Taira, Iwaki, Fukushima, 970-8034, Japan. [email protected].
  3. 3Department of Applied Chemistry and Biochemistry, Fukushima College, National Institute of Technology, Nagao 30, Kamiarakawa, Taira, Iwaki, Fukushima, 970-8034, Japan.
  4. 4Department of Materials Chemistry and Bioengineering, Oyama College, National Institute of Technology, 771, Nakakuki, Oyama, Tochigi, 323-0806, Japan.
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Abstract

Objective

Konjac glucomannan (KGM)/activated carbon (AC) composite membranes were previously shown to retain the intrinsic adsorption capability of AC when removing methylene blue. However, the applicability of this composite system to structurally and electrostatically distinct dyes, and its robustness to variations in KGM source have not been fully evaluated. This study extends the earlier work by examining the adsorption of methyl violet B (MV), a bulkier cationic dye, and methyl orange (MO), an anionic dye, using KGM from a different supplier.Results

Stable KGM/AC membranes were fabricated and showed no leakage of AC during experiments. Both MV and MO exhibited Type-I Langmuir adsorption behavior, and the maximum adsorption capacity increased linearly with the AC mass fraction (MFAC), demonstrating that AC embedded in the membrane remained accessible. The Langmuir equilibrium constant showed no systematic dependence on MFAC, indicating that the neutral KGM matrix did not alter the affinity of AC for the dyes. The membrane prepared with a different KGM lot performed comparably to that in the previous study, confirming reproducibility. These findings demonstrate that the KGM/AC membrane maintains AC functionality across dyes with molecular properties and is robust with respect to variation in polymer source.

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Cite

BibTeXRIS
BibTeX
@article{hagiri2026extended,
  title = {{Extended evaluation of activated carbon-embedded glucomannan membranes for the adsorption of structurally and charge-distinct dyes.}},
  author = {Masahide Hagiri and Taisei Igari and Keita Kashima},
  journal = {BMC research notes},
  year = {2026},
  month = jul,
  doi = {10.1186/s13104-026-07952-x},
  url = {https://europepmc.org/article/MED/42897687},
  note = {CC BY-NC-ND},
}
RIS
TY  - JOUR
TI  - Extended evaluation of activated carbon-embedded glucomannan membranes for the adsorption of structurally and charge-distinct dyes.
AU  - Masahide Hagiri
AU  - Taisei Igari
AU  - Keita Kashima
PY  - 2026
DA  - 2026/07/01
JO  - BMC research notes
DO  - 10.1186/s13104-026-07952-x
UR  - https://europepmc.org/article/MED/42897687
AB  - Objective  Konjac glucomannan (KGM)/activated carbon (AC) composite membranes were previously shown to retain the intrinsic adsorption capability of AC when removing methylene blue. However, the applicability of this composite system to structurally and electrostatically distinct dyes, and its robustness to variations in KGM source have not been fully evaluated. This study extends the earlier work by examining the adsorption of methyl violet B (MV), a bulkier cationic dye, and methyl orange (MO), an anionic dye, using KGM from a different supplier.Results  Stable KGM/AC membranes were fabricated and showed no leakage of AC during experiments. Both MV and MO exhibited Type-I Langmuir adsorption behavior, and the maximum adsorption capacity increased linearly with the AC mass fraction (MFAC), demonstrating that AC embedded in the membrane remained accessible. The Langmuir equilibrium constant showed no systematic dependence on MFAC, indicating that the neutral KGM matrix did not alter the affinity of AC for the dyes. The membrane prepared with a different KGM lot performed comparably to that in the previous study, confirming reproducibility. These findings demonstrate that the KGM/AC membrane maintains AC functionality across dyes with molecular properties and is robust with respect to variation in polymer source.
SN  - 1756-0500
ER  -