Study on Ag(I) Loaded ZIF-8 and Ag(I) Ion Release in Artificial Seawater

Shang-Tien Tsai; Wei-Cheng Tang; Yeu-Kuen Wei; Kevin C-W Wu

doi:10.3390/ma16052040

Study on Ag(I) Loaded ZIF-8 and Ag(I) Ion Release in Artificial Seawater

Materials (Basel). 2023 Mar 1;16(5):2040. doi: 10.3390/ma16052040.

Authors

Shang-Tien Tsai¹, Wei-Cheng Tang², Yeu-Kuen Wei², Kevin C-W Wu^{1

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Affiliations

¹ Program of Green Materials and Precision Devices, National Taiwan University, Taipei 10617, Taiwan.
² Material and Chemical Research Laboratories, Industrial Technology Research Institute, Hsinchu 30011, Taiwan.
³ Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan.
⁴ Institute of Biomedical Engineering & Nanomedicine, National Health Research Institutes, 35 Keyan Road, Miaoli 35053, Taiwan.
⁵ Department of Chemical Engineering and Materials Science, Yuan Ze University, Taoyuan 32003, Taiwan.
⁶ Yonsei Frontier Lab, Yonsei University, 50 Yonsei-ro, Seoul 03722, Republic of Korea.

Abstract

From a porous structure perspective, the one-stage de novo synthesis method and impregnation method were applied to synthesize Ag(I) ion-containing ZIF-8 samples. With the de novo synthesis method, Ag(I) ions could be located inside micropores or adsorbed on the external surface of the ZIF-8 by selecting AgNO₃ in water or Ag₂CO₃ in ammonia solution as precursors, respectively. The ZIF-8 confining Ag(I) ion exhibited a much lower constant releasing rate than the Ag(I) ion adsorbed on the ZIF-8 surface in artificial seawater. As such, strong diffusion resistance in association with the confinement effect is contributed by ZIF-8's micropore. On the other hand, the release of Ag(I) ions adsorbed on the external surface was diffusion limited. Therefore, the releasing rate would reach a maximum not increasing with Ag(I) loading in the ZIF-8 sample.

Keywords: ZIF-8; de novo synthesis; metal-organic frameworks; silver release.

Grants and funding

The authors thank the National Science and Technology Council (NSTC), Taiwan (111-2124-M-002-021 and 111-2628-E-002-008) for the funding support. Also, financial support by the Center of Atomic Initiative for New Materials, National Taiwan University (NTU), from the Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education in Taiwan (111L900801) is acknowledged. This research, in part, was a joint research project between NTU and the Material and Chemical Research Laboratories, Industrial Technology Research Institute.