Behavior of sulfate ions during biogenic scorodite crystallization from dilute As(III)-bearing acidic waters

Masahito Tanaka, Keiko Sasaki, Naoko Okibe

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

This study revealed the importance of SO4 2− ions during biogenic scorodite crystallization via a two-stage As-removal process, using a combination of liquid and solid analyses (chemical digestion, FT-IR, SEM, TG-DTA, particle distribution). The first-stage As-removal was induced by microbial oxidation of Fe2+ and As(III), precipitating SO4 2−-bearing amorphous precursors composed of basic ferric sulfate (MFex(SO4)y(OH)z) and ferric arsenate (FeAsO4·(2 + n)H2O). This was followed by an induction period (a period of constant concentration), where dissolution-recrystallization of unstable amorphous precursors proceeded: Re-dissolved metal ions became locally concentrated on the surface of precursors, which gave the driving force for the second-stage As-removal as secondary layers of crystalline biogenic scorodite (Fe(AsO4)0.94(SO4)0.08·1.69H2O) out of even more dilute and seeded solution. This phase transformation process was also accompanied by continuous dehydration. This two-stage As-removal via SO4 2−-mediated phase transformation was shown to be key to promote biogenic scorodite formation with greater final As-removal from dilute As(III)-bearing solutions.

Original languageEnglish
Pages (from-to)144-152
Number of pages9
JournalHydrometallurgy
Volume180
DOIs
Publication statusPublished - Sep 2018

All Science Journal Classification (ASJC) codes

  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Behavior of sulfate ions during biogenic scorodite crystallization from dilute As(III)-bearing acidic waters'. Together they form a unique fingerprint.

  • Cite this