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@ARTICLE{VelazquezGarcia:638308,
author = {Velazquez Garcia, Jose and Frenzke, Susann and de los
Santos Valladares, Luis and Barnes, Crispin H. W. and
Copeman, Christopher and Singh, Jatinder and Kulkarni,
Satishkumar and Keller, Thomas F. and Sanchez Cornejo, Henry
and Huanaco, Dina and Anwary, Maryam and Elorche, Rachida
and Asprilla Herrera, Lina Maria and Lukaszczyk, Weronika
and Eroglu, Nuray and Eifler, Dirk and Techert, Simone},
title = {{S}ize {M}atters: {L}imitations of {ZIF}-8 {M}onolith and
{I}ts {N}i-, {C}o- and {C}u-{D}oped {V}ariants for
{A}dsorption of {R}hodamine {B}},
journal = {Materials advances},
volume = {6},
number = {21},
issn = {2633-5409},
address = {Cambridge},
publisher = {Royal Society of Chemistry},
reportid = {PUBDB-2025-04026},
pages = {7800 - 7811},
year = {2025},
abstract = {Despite numerous publications reporting the instability of
ZIF-8 in water, it is still used for water purification,
including the adsorption of molecules significantly larger
than the pore window. This work involves the synthesis,
characterisation and application of ZIF-8 monoliths,
including those doped with Ni, Co and Cu at levels of $4\%,$
$8\%$ and $12\%,$ for rhodamine B adsorption in water.
Characterisation techniques include optical microscopy,
PXRD, FTIR, SEM-EDX, TGA-FTIR and N2 adsorption. The results
reveal mm-cm sized monoliths with identical crystalline
structure and morphology, but different properties depending
on the doping metal and level. Except for $4\%$ of Co-doped
ZIF-8, doping generally narrows the pore size distribution
to micropores (maximum between 10.9–11.6 Å), whereas the
undoped monolith shows a combination of micropores and
mesopores (10.2–38 Å). Doping with more than $4\%$ Co2+
or Cu2+ results in higher BET surface areas (up to 1180 and
1100 m2·g-1, respectively) compared to the undoped monolith
(960 m2·g-1). However, when immersed in a 10 mg·L-1
rhodamine B solution, all monoliths exhibit both slower
adsorption kinetecs and reduced capacities (0.61 and 1.82
mg·g-1) than reported nano-/microsize particles. Desorption
of rhodamine B occurred between 9 and 24 hrs, attributed to
up to $20\%$ degradation of the monolith. Immersion in
Milli-Q water for five days led to a white residue on the
surface, with FTIR indicating a new phase. These results
suggest ZIF-8 and its variants are unsuitable for adsorbing
large molecules in water but are suitable for small
molecules like gases.},
cin = {FS-SCS / FS-NL},
ddc = {540},
cid = {I:(DE-H253)FS-SCS-20131031 / I:(DE-H253)FS-NL-20120731},
pnm = {632 - Materials – Quantum, Complex and Functional
Materials (POF4-632) / SFB 1633 C06 - Sub-molekulare
Kontrolle über photoinduzierten PCET und PCEnT (C06#)
(564189651)},
pid = {G:(DE-HGF)POF4-632 / G:(GEPRIS)564189651},
experiment = {EXP:(DE-MLZ)NOSPEC-20140101 /
EXP:(DE-H253)Nanolab-04-20150101},
typ = {PUB:(DE-HGF)16},
doi = {10.1039/D5MA00797F},
url = {https://bib-pubdb1.desy.de/record/638308},
}