Layered double hydroxide ceramic materials and its H2S incorporation through topochemical reactions

Abstract

Oral malodor is produced by microbial putrefaction of food debris, resulting in the formation of volatile sulfur compounds (VSCs), such as hydrogen sulfide (H2S) and methyl mercaptan, produced in the mouth. VSCs also have a bad influence on the periodontium and cause discoloration of dental alloy. Thus, an adsorbent that highly adsorbs VSCs would be useful for a healthy mouth and may prevent tooth decay. We investigated the possibility of adsorbing H2S using heat-treated Magnesium aluminum hydrotalcite. We found that H2S is adsorbed onto heat-treated hydrotalcite materials in an aqueous solution using gas chro-matography with a flame photometric detector (FPD/GC), and the sulfide was found between the layers of the hydrotalcite structure by conducting a powder X-ray diffraction (XRD) analysis and using infrared spectroscopy (FT-IR). The amounts of adsorbed sulfide were higher for hydrotalcite heat-treated at 500 and 600°C for 30min. The hydrotalcite material is expected to be an adsorbent material and useful for maintaining good oral hygiene. © 2013 The Ceramic Society of Japan. All rights reserved. © 2013 The Ceramic Society of Japan.