Adsorption and photocatalytic degradation of polyvinyl alcohol in aqueous solutions using P-25 TiO2

Ling Jung Hsu, Li Ting Lee, Chia Chang Lin*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

58 Scopus citations

Abstract

This investigation evaluates the effectiveness of P-25 TiO2 in removing polyvinyl alcohol (PVA) from aqueous solutions. The effects of pH, P-25 TiO2 dosage, initial PVA concentration, and addition of oxygen and inorganic anions on the removal efficiency of PVA were studied experimentally. The results importantly indicate that lower pH, higher P-25 TiO2 dosage, and lower initial PVA concentration were associated with high removal efficiency of PVA during 150min of operation. The observed behavior reveals that the removal of PVA using P-25 TiO2 was attributable to adsorption and photocatalytic degradation, and the mechanism differed greatly from that with larger TiO2 particles. Adding oxygen increased the removal efficiency of PVA, as measured after 150min. However, Cl- and SO42- ions reduced the removal efficiency of PVA after 150min. NO3- ions did not affect the removal efficiency of PVA over such a period. In the absence of inorganic anions, around 100% of PVA was removed at pH 5, with a P-25 TiO2 dosage of 0.12gL-1, an initial PVA concentration of 20mgL-1, and an air flow rate of 400mLmin-1, as measured after 150min.

Original languageEnglish
Pages (from-to)698-705
Number of pages8
JournalChemical Engineering Journal
Volume173
Issue number3
DOIs
StatePublished - 01 10 2011

Keywords

  • Adsorption
  • P-25 TiO
  • PVA
  • Photocatalytic degradation
  • Polyvinyl alcohol

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