Development of a Continuous Photo-catalytic/Ozonation System: Application on Amido Black Removal from Water

Dalanda Hamdi, Lobna Mansouri, Yuri Park, Varsha Srivastava, Mika Sillanpaa, Latifa Bousselmi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

A continuous system for photo-catalytic/ozonation was designed at laboratory scale and evaluated for water treatment using Amido Black 10B dye (AB) as a pollutant model. The effect of single ozonation (O3), photolytic ozonation (UV/O3) and combined photocatalytic/ozonation treatment (UV/O3/TiO2) were investigated. TiO2 nanocatalysts films were coated on stainless steel grids (AISI 304) by Atomic Layer Deposition technique (ALD) at 350 °C. An experimental hydrodynamic study of the designed reactor was conducted based on dry and total pressure drop. Three flow regimes were observed by increasing the total pressure drop against gas load factor (Fs). Depollution experiments conducted on the developed reactor showed that reaction rates and efficiency of studied processes were dependent on the studied operational parameters (initial dye concentration, ozone dose, pH). The maximum AB dye ([AB]0 = 100 mg. L−1) conversion efficiency, using the designed (UV/O3/TiO2) system, was about 40.3% of initial TOC and 100% AB color removal was achieved within 10 min at an optimal ozone dose of 132 mg. L−1. A significant improvement in AB removal using UV/TiO2/O3 process (koverall = 0.056 min−1, 40.3%) compared to O3 alone (koverall = 0.032 min−1, 26.87). Results shows also that the addition of tert-butanol (TB), as radical scavenger ([TB] = 0.2 M and 0.4 M), greatly affects the reaction mechanisms of a photocatalytic ozonation process within 5 min of reaction, by decreasing the Amido Black conversion from 99.67% ([TB] = 0 M) to 74.63% and 31.35%, respectively, in presence of 0.2 M and 0.4 M of tert-butanol. The remarkable decrease in AB removal rate observed in the presence of a radical scavenger expresses that there was an obvious enhancement of hydroxyl radical OH• generation due to the synergetic effect between ozone and photocatalytic processes.

Original languageEnglish
Pages (from-to)545-565
Number of pages21
JournalOzone: Science and Engineering
Volume44
Issue number6
DOIs
Publication statusPublished - 2022
Externally publishedYes

Keywords

  • Ozonation
  • TiO
  • amido black
  • catalytic ozonation
  • continuous reactor
  • photocatalysis
  • photocatalytic ozonation
  • sieve plates

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry

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