Preparation of Multifunctional β-hemihydrate Gypsum using Oyster Shell Powder as the Partial Replacement of Ag/TiO₂ Particle

Abstract

This work aimed to use oyster shell powder (OSP) as the partial replacement of Ag/TiO₂ particle to obtain multifunctional β-hemihydrate gypsum. Thus, the β-hemihydrate gypsum was mixed with different contents of OSP and Ag/TiO₂ particle. Antibacterial and MB removal experiments were conducted to assess the antibacterial characteristic and photocatalytic activity of β-hemihydrate gypsum with Ag/TiO₂ particle and OSP. Besides, the formaldehyde degradation test was carried out to evaluate its formaldehyde removal ratio. Moreover, their setting times, compressive and flexural strengths at 1, 3, and 28 days were comparatively analyzed. The experimental results prove that the composite use of OSP and Ag/TiO₂ particle provide feasible multifunction for the β-hemihydrate gypsum. They can further improve the bactericidal rates and exhibit extra MB removal ratios compared with the gypsum plasters with single Ag/TiO₂ particle. Besides, they can increase the formaldehyde degradation ratios, and this promotion is related to the introduction of Ag/TiO₂ particle. However, OSP delays the initial setting time but promotes the final setting time of β-hemihydrate gypsum, and Ag/TiO₂ particle hardly affects the setting times. Furthermore, OSP reduces the strengths of plasters at 1, 3, and 28 days. But in general, the composite addition of OSP and Ag/TiO₂ particle increase the compressive and flexural strengths of gypsum plasters at 1, 3, and 28 days. These results provide theoretical guidance for the recycling of OSP and the preparation of gypsum-based products with antibacterial and formaldehyde degradation capabilities.

Keywords

oyster shell powder / Ag/TiO₂ particle / β-hemihydrate gypsum / bactericidal rate / setting times

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