Ability of hydroxyapatite synthesized from waste oyster shells to remove fluoride ions

Sota Terasaka, Masanobu Kamitakahara, Taishi Yokoi, Hideaki Matsubara

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Calcium carbonates, the main component of seashell waste, can be converted to hydroxyapatite (HA) via phosphate solution treatment. HA can remove F- from water, as recommended by the World Health Organization (WHO), and HA particles of small sizes and/or large amounts are expected to remove F- more effectively. To control the size and amount of synthesized HA, oyster shells were treated in the (NH4)2HPO4 solution whose pH value was adjusted to 10 at 4120° C for 24 h. The HA particle size and amount increased with increasing reaction temperature. The samples' abilities to remove F- were evaluated by immersing them in F--containing solutions. The sample treated at 30°C removed F- the most effectively, achieving a F- concentration below 1.5 mg·dm-3, which is the level recommended by the WHO. The HA surface area is important in F- removal.

Original languageEnglish
Pages (from-to)1509-1512
Number of pages4
JournalMaterials Transactions
Volume56
Issue number9
DOIs
Publication statusPublished - 2015 Jan 1

Keywords

  • Environmental purification material
  • Fluoride ion
  • Hydroxyapatite
  • Oyster shell

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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