H₂S Adsorption Capability of Layered Double Hydroxide Containing Transition Metal

Abstract:

Many people worldwide assess themselves as having halitosis, often caused by bio-film and microbial putrefaction of the debris in the mouth, leading to the production of mal-odorous compounds, volatile sulfur compounds (VSC) such as hydrogen sulfide (H₂S), methyl mercaptan and dimethyl sulfide. Some desulfurizing agents such as CaO and Na₂CO₃ in the industry are widely used, but there are few dental desulfurizing agents or adsorbents for removal of VSC. Ag ion exchanged zeolite material showed a high adsorptive property of H₂S in aqueous solution (H₂S water), however Ag sulfides were formed in aqueous solution. The VSC adsorption capabilities of layered double hydroxides, of which composition is A_1-xAl_x(OH)₂B_x/n·mH₂O, where A is Mg and/or Zn and B is CO₃^2-, in aqueous medium was studied by FPD/GC. The concentration of H₂S fell to 0% in 2 h when the Zn hydrotalcite was used, while that decreased to 20% in 18 h when the Mg hydrotalcite heated at 500 °C was used. The zinc ion was not detected in the H₂S water after soaking for 18 hours.The Zn hydtotalcite is expected to be likely adsorbent for the fast removal of VSC from the mouth.

• Periodical: Key Engineering Materials (Volume 631)
• Pages: 212-215
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.631.212
• Online since: November 2014
• Authors: Yoshiyuki Yokogawa, Hiroya Sano, Shota Namba, Kazuo Fujii, Yuki Morita, Masato Hotta, Yutaka Doi
• Keywords: Adsorption, GC, Hydrotalcite, Transision Metal, VSC

References

[1] S.S. Socransky, A.D. Haffajee, M.A. Cugini, C. Smith, R.L. Kent Jr, J. Clin. Perodontol, 25 (1998) 134-144.

[2] B.L. Armstrong, M.L. Sensat and J.L. Stoltenberg, J. Dent. Hygiene, 84 (2010) 65-74.

[3] H. Yamamoto, Periodontal Antibiotic Therapy, 1 st ed., Quintessence Pub. Co., Tokyo, 2012, pp.79-97.

[4] Y. Yokogawa, H. Sano, and I. Kishida, J. Ceram. Soc. Jpn, 121 (2013) 788-791.

[5] Y. Yokogawa, Y. Yagi, H. Sano, A. Nakamura, I. Kishida, Key Eng. Mater., 529-530 (2013) 650-53.

[6] M. J. Hernandez-Moreno, M.A. Ulibarri, J. L. Rendon, C.J. Serna, Phys. Chem. Minerals, 12 (1985) 34-38.