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@ARTICLE{Petukhov:640307,
      author       = {Petukhov, Dmitrii I. and Chumakov, Andrei P. and Johnson,
                      Daniel},
      title        = {{E}ffect of competition between swelling and dye adsorption
                      on the performance and selectivity of graphene oxide
                      membranes},
      journal      = {Nanoscale},
      volume       = {17},
      number       = {44},
      issn         = {2040-3364},
      address      = {Cambridge},
      publisher    = {RSC Publ.},
      reportid     = {PUBDB-2025-04760},
      pages        = {25572 - 25588},
      year         = {2025},
      note         = {Waiting for fulltext},
      abstract     = {The performance of graphene oxide (GO) based nanofiltration
                      membranes is strongly influenced by their interlayer
                      spacing, governed by two competing factors: GO swelling in
                      the liquid phase and penetrant adsorption. In this work, the
                      structure of GO membranes was optimized via H2O2 treatment,
                      and their performance was evaluated during nanofiltration of
                      cationic and anionic dyes. For anionic dyes, the permeate
                      flux remained stable, whereas cationic dyes caused a
                      significant and irreversible flux decline. To clarify this
                      behavior, dye adsorption experiments and in situ diffraction
                      analyses of the GO interlayer distance were performed. The
                      highest adsorption capacity was recorded for cationic
                      methylene blue (MnB) at 643 mg g−1 (GO), compared to 97 mg
                      g−1 (GO) for anionic methyl orange (MO). In the case of
                      MO, the occupation of the interlayer space by dye molecules
                      was compensated by slight structural expansion, maintaining
                      flux stability. Conversely, the filtration of even a small
                      amount of MnB solution caused a reduction in d-spacing from
                      12.1 ± 0.1 Å to 11.7 ± 0.1 Å, followed by further
                      shrinkage to 11.4 ± 0.1 Å due to the electrostatic
                      compression of the negatively charged GO with the positively
                      charged dye molecules. Combined with physical blockage by
                      dye molecules, this led to a rapid decline in membrane
                      permeance described well by Poiseuille-based permeance
                      trends. These results show that adsorption, particularly at
                      low penetrant concentrations, can affect measured rejection
                      rates and that adsorption can substantially alter the
                      membrane permeance. Considering the roles of adsorption and
                      electrostatic interactions, charged dyes are unsuitable for
                      permeation tests intended to assess the intrinsic
                      size-exclusion properties of two-dimensional lamellar
                      membranes.},
      cin          = {FS DOOR-User / FS-PET-D},
      ddc          = {600},
      cid          = {$I:(DE-H253)FS_DOOR-User-20241023$ /
                      I:(DE-H253)FS-PET-D-20190712},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G3 - PETRA III (DESY) (POF4-6G3) /
                      FS-Proposal: I-20240747 (I-20240747)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G3 /
                      G:(DE-H253)I-20240747},
      experiment   = {EXP:(DE-H253)P-P03-20150101},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1039/D5NR02176F},
      url          = {https://bib-pubdb1.desy.de/record/640307},
}