TiO2-based photocatalytic degradation of 2-chlorophenol adsorbed on hydrophobic clay

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Abstract

The combination of adsorption and heterogeneous photocatalysis has been investigated as a promising technology for the removal of organic water pollutants. A laboratory study of the removal and decomposition of 2-chlorophenol (2-CP) as a toxic organic pollutant was carried out under various conditions with an organophilized clay mineral (hexadecylpyridinium chloride-modified montmorillonite; HDPM) as adsorbent and Degussa P25 TiO2 as photocatalyst. Three different oxidation processes leading to the degradation of 2-CP were compared: direct photolysis, heterogeneous photocatalysis in a TiO2 suspension, and the decomposition of substrate adsorbed on HDPM in the presence of TiO2. Both the degradation of 2-CP and the formation of intermediates were analyzed by HPLC, the total organic carbon content and the total organic and inorganic chloride contents were measured to monitor the mineralization process, and X-ray diffraction and thermoanalytical measurements were made to characterize the hydrophobic clay adsorbent. The heterogeneous photocatalytic degradation of dissolved (2-CP/UV/TiO2) and desorbed 2-CP (2-CP/HDPM/UV/TiO2) appeared to be equally efficient, whereas direct photolysis of 2-CP was far less efficient in the oxidative destruction. HDPM proved to be a suitable adsorbent, capable of adsorbing toxic organics from water. It was demonstrated that the adsorbent (at relatively high concentration) did not decrease the rate of mineralization of 2-CP. The results confirmed that the adsorbent retains its structure and composition during the mineralization process, and thus it can be reused without regeneration. The combination of adsorption and heterogeneous photocatalysis studied may be an efficient and economical means of accumulating, removing, and oxidizing organic water contaminants, and its application is in accordance with the growing environmental demands.

Original languageEnglish
Pages (from-to)3618-3624
Number of pages7
JournalEnvironmental Science and Technology
Volume36
Issue number16
DOIs
Publication statusPublished - Aug 15 2002

Fingerprint

chlorophenol
Adsorbents
Clay
Photocatalysis
clay
Degradation
degradation
Photolysis
Clay minerals
Poisons
Decomposition
mineralization
Adsorption
Water
photolysis
Organic pollutants
Chlorides
Photocatalysts
Organic carbon
Water Pollutants

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

TiO2-based photocatalytic degradation of 2-chlorophenol adsorbed on hydrophobic clay. / Mogyorósi, K.; Farkas, András; Dékány, I.; Ilisz, I.; Dombi, A.

In: Environmental Science and Technology, Vol. 36, No. 16, 15.08.2002, p. 3618-3624.

Research output: Contribution to journalArticle

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