Application of soluble bio-organic substances (SBO) as photocatalysts for wastewater treatment: Sensitizing effect and photo-Fenton-like process
Articolo
Data di Pubblicazione:
2013
Abstract:
Soluble bio-organic substances (SBO) isolated from urban biorefuses have been investigated in photocatalytic
processes for wastewater treatment using a cationic dye, namely crystal violet (CV) as
target compound. The SBO have been found to enhance the photobleaching of CV solutions with an
optimal SBO concentration of ca. 20 mg L−1. Mechanistic investigation based on chemical probes and
changes in the absorption spectrum of CV in the presence of SBO seems to indicate that a complex
formed between sensitizer and substrate plays a major role in the process. SBO have also been tested
for the implementation of photo-Fenton processes at circumneutral media: the observed pseudo first
order rate constants for CV decoloration was higher for UV/SBO/Fe(II)/H2O2 (5.5
×
10−3 min−1) than for
UV/Fe(II)/H2O2 (1.5
×
10−3 min−1). A modified mechanism, in which HO• are less relevant that at the
acidic medium, is in agreement with results of experiments carried out with chemical probes.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
J. Gomis; R.F. Vercher;; A.M. Amat; D.O. Mártire; M.C. González; A. Bianco Prevot;
E. Montoneri; A. Arques; L. Carlos
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