Effects of the molar ratio of hydroxide and fluoride to Al(III) on fluoride removal by coagulation and electrocoagulation

C. Y. Hu, S. L. Lo, W. H. Kuan

研究成果: 雜誌貢獻文章

87 引文 斯高帕斯(Scopus)

摘要

The effect of the molar ratio of hydroxide and fluoride ions to Al(III) ions (γOH and γF) on coagulation and electrocoagulation (EC) was studied to solve the problem of the over addition of acid or base. The efficiency of defluoridation was approximately 100% when the sum of γOH and γF (γOH+F) was close to 3. This finding reveals that the fluoride ions and the hydroxide ions can co-precipitate with Al(III) ions and the formula of the precipitate is AlnFm(OH)3n-m. However, when γOH was less than 2.4, the defluoridation efficiency, given that γOH+F=3, dropped as γOH fell, because the amount of aluminum polymer formed dropped. The efficiency of defluoridation of EC exceeded that of coagulation for equal γOH and γOH+F, when γOH+F>3, proving the existence of an electrocondensation effect.
原文英語
頁(從 - 到)472-476
頁數5
期刊Journal of Colloid and Interface Science
283
發行號2
DOIs
出版狀態已發佈 - 三月 15 2005
對外發佈Yes

Keywords

  • Aluminum
  • Coagulation
  • Defluoridation
  • Electrocoagulation
  • Fluoride
  • Molar ratio

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry
  • Surfaces and Interfaces

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