Coral-mimetic production of aragonite films from CO2 captured by biogenic polyamines

Kohei Takashina; Hiroto Watanabe; Yuya Oaki; Yoshikazu Ohno; Ko Yasumoto; Hiroaki Imai

doi:10.1039/D4CE00126E

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Coral-mimetic production of aragonite films from CO₂ captured by biogenic polyamines†

Kohei Takashina,^a Hiroto Watanabe,

^a Yuya Oaki,

^a Yoshikazu Ohno,

^b Ko Yasumoto

^b and Hiroaki Imai

*^a

Author affiliations

* Corresponding authors

^a Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
E-mail: [email protected]

^b School of Marine Biosciences, Kitazato University, 1-15-1, Kitazato, Minami-ku, Sagamihara 252-0373, Japan

Abstract

We designed CaCO₃ films comprised of aragonite nanorods by mimicking the microstructure and the formation process of the calcareous skeleton of a stony coral in the sea. Hierarchically structured calcareous frameworks are produced from the center of calcification (COC) under alkaline conditions in the organism. In the first step, a seed layer consisting of crystalline nanoparticles was produced as an artificial COC on a polyvinyl alcohol sheet in a solution containing Ca²⁺ ions, polyacrylic acid, and a biogenic polyamine, such as putrescine, through the gradual absorption of atmospheric CO₂. In the second step, aragonite nanorods grew on the artificial COC in the mother liquid obtained by mixing a putrescine solution saturated with CO₂ and a CaCl₂ solution containing Mg²⁺ and alginate. Finally, we obtained a dense, homogeneous film consisting of aragonite nanorods similar to the coral skeleton through the fixation of CO₂.

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Article information

DOI: https://doi.org/10.1039/D4CE00126E
Article type: Paper
Submitted: 08 Feb 2024
Accepted: 04 Mar 2024
First published: 25 Mar 2024
This article is Open Access

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CrystEngComm, 2024,26, 2065-2071

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Coral-mimetic production of aragonite films from CO₂ captured by biogenic polyamines

K. Takashina, H. Watanabe, Y. Oaki, Y. Ohno, K. Yasumoto and H. Imai, CrystEngComm, 2024, 26, 2065 DOI: 10.1039/D4CE00126E

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