Biomineralization at the Molecular Level: Amino Acid-Assisted Crystallization of Zeotype AlPO4·1.5H2O–H3

Qiaolin Lang (1) , Guangying Fu (1) , Haonuan Zhao (1) , Juan Wang (1) , Xiaobo Yang (1) , Valentin Valtchev (2, 1)

1 Qingdao Institute of Bioenergy and Bioprocess Technology [Qingdao, China]
2 LCS - Laboratoire catalyse et spectrochimie

Three aminoacids: proline, histidine, and lysine are used as organic additives in the hydrothermal synthesis of the zeotype material AlPO 4 •1.5H 2 O-H3 (framework topology code APC). A detailed analysis of the factors controlling the formation of AlPO 4 •1.5H 2 O-H3 is performed. The role of aminoacids in the formation process of the frameworks is addressed based on comparisons of the crystal phase selection of different synthetic recipes and the insights provided by the FTIR analysis of the synthetic gels and the crystalline products. The phase transition of AlPO 4 •1.5H 2 O-H3 to AlPO 4-C (APC), and subsequently to AlPO 4-D (APD) upon heating to 1000 o C was followed by in situ XRD analysis. The present work has been the first progress to understanding the role of the bioactive molecules in the crystallization of inorganic open-framework microporous materials. An active, non-classical structuredirecting role that aminoacids play during the zeotype crystallization is proposed, i.e., positively charged aminoacids cap the growing surface of microporous AlPO 4 , and attract aluminate and phosphate anions from the solution phase for further growth.

Domaines: Chimie inorganique

Qiaolin Lang, Guangying Fu, Haonuan Zhao, Juan Wang, Xiaobo Yang, et al.. Biomineralization at the Molecular Level: Amino Acid-Assisted Crystallization of Zeotype AlPO4·1.5H2O–H3. Crystal Growth & Design, In press, ⟨10.1021/acs.cgd.1c01160⟩. ⟨hal-03429665⟩