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Peer-reviewedCC BYMolecules (Basel, Switzerland)

NMDG-Functionalized UiO-66 via PEI Bridging for Efficient Boron Adsorption in Salt Lake Brine.

  • Min Guo1,2
  • Xunduo Wang3
  • Leiyang Zhao3
  • Yuping Xiao1
  • Jiaojiao Zhang1
  • Chengbing Ma1,2
  • Qin Shuai3
  • Shengrui Xu3
  1. 1Qaidam Comprehensive Geological and Mineral Exploration Institute of Qinghai Province, Golmud 816099, China.
  2. 2Qinghai Provincial Key Laboratory of Salt Lake Resources Exploration and Research in Qaidam Basin, Golmud 816099, China.
  3. 3Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China.
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Abstract

Salt lake brines are a source of boron, but their complex ionic composition presents challenges for adsorption-based recovery. In this study, N-methyl-D-glucamine (NMDG) was introduced into a PEI-containing UiO-66 composite through sequential post-synthetic modification. Structural and spectroscopic characterization supported the incorporation of the organic functional layer, while the characteristic UiO-66 diffraction peaks were retained. NMDG/PEI/UiO-66 showed higher boron uptake than the tested UiO-66 and PEI/UiO-66 controls. At 298 K, the highest experimentally observed capacity was 76.11 mg/g, whereas the Langmuir-fitted limiting capacity was 97.59 mg/g. The kinetic and equilibrium data were described by the pseudo-second-order and Langmuir models, respectively. The material retained approximately 86% of its initial adsorption capacity after three adsorption-desorption cycles and showed boron uptake in brines from Qarhan and Mami Cuo salt lakes. FTIR and XPS observations were consistent with the involvement of the functional layer in boron uptake. These results demonstrate the potential of the NMDG-containing UiO-66 composite for boron recovery under the investigated conditions.

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Cite

BibTeXRIS
BibTeX
@article{guo2026nmdgfunctionalized,
  title = {{NMDG-Functionalized UiO-66 via PEI Bridging for Efficient Boron Adsorption in Salt Lake Brine.}},
  author = {Min Guo and Xunduo Wang and Leiyang Zhao and Yuping Xiao and Jiaojiao Zhang and Chengbing Ma and Qin Shuai and Shengrui Xu},
  journal = {Molecules (Basel, Switzerland)},
  year = {2026},
  month = sep,
  doi = {10.3390/molecules31193410},
  url = {https://europepmc.org/article/MED/42883177},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - NMDG-Functionalized UiO-66 via PEI Bridging for Efficient Boron Adsorption in Salt Lake Brine.
AU  - Min Guo
AU  - Xunduo Wang
AU  - Leiyang Zhao
AU  - Yuping Xiao
AU  - Jiaojiao Zhang
AU  - Chengbing Ma
AU  - Qin Shuai
AU  - Shengrui Xu
PY  - 2026
DA  - 2026/09/24
JO  - Molecules (Basel, Switzerland)
DO  - 10.3390/molecules31193410
UR  - https://europepmc.org/article/MED/42883177
AB  - Salt lake brines are a source of boron, but their complex ionic composition presents challenges for adsorption-based recovery. In this study, N-methyl-D-glucamine (NMDG) was introduced into a PEI-containing UiO-66 composite through sequential post-synthetic modification. Structural and spectroscopic characterization supported the incorporation of the organic functional layer, while the characteristic UiO-66 diffraction peaks were retained. NMDG/PEI/UiO-66 showed higher boron uptake than the tested UiO-66 and PEI/UiO-66 controls. At 298 K, the highest experimentally observed capacity was 76.11 mg/g, whereas the Langmuir-fitted limiting capacity was 97.59 mg/g. The kinetic and equilibrium data were described by the pseudo-second-order and Langmuir models, respectively. The material retained approximately 86% of its initial adsorption capacity after three adsorption-desorption cycles and showed boron uptake in brines from Qarhan and Mami Cuo salt lakes. FTIR and XPS observations were consistent with the involvement of the functional layer in boron uptake. These results demonstrate the potential of the NMDG-containing UiO-66 composite for boron recovery under the investigated conditions.
SN  - 1420-3049
ER  -