Structure‐Induced Enhanced Dissolving Properties of Mg(OH)₂ Prepared by Glycine‐Assisted MgO Hydration

Abstract

Mg(OH)2’s dissolving properties have a considerable influence on its application performance. This study aims to improve the dissolving properties of Mg(OH)2 by modifying its crystal structure. Mg(OH)2 crystals with a large diameter‐to‐height ratio (≈40) structure are synthesized via a glycine‐assisted MgO hydration method utilizing glycine's differing adsorption energy on the (001) and (110) surfaces of Mg(OH)2 (−306.2 and −277.4 kJ mol−1). Compared to the control sample, the results of the dissolution kinetics investigation indicate that glycine‐assisted hydration considerably improves the apparent reaction rate constant of dissolution from 0.0020–0.0071 to 0.0039–0.0120 min−1. The enhanced dissolving properties are mostly induced by the large and thin crystal grain structure, which disintegrates easily during the dissolution process, exposing more reactive sites. The findings reported in this study provide a new approach to improving the dissolving properties of Mg(OH)2 that can enable its enhanced use in various applications.