Efficiency of 1,4-dichlorobenzene degradation in water under photolysis, photocatalysis on TiO2 and sonolysis.
The rate of 1,4-dichlorobenzene (1,4-DCB) degradation and mineralization in the aqueous phase was investigated either under direct photolysis or photocatalysis in the presence of commercial or sol-gel synthesized TiO2, or under sonolysis at 20 kHz with different power inputs. Two lamps, both emitting in the 340-400 nm wavelength range with different energy, were employed as irradiation sources. Photocatalysis ensured faster removal of 1,4-DCB with respect to sonolysis and direct photolysis. The highest degradation and mineralization rate was attained with the combined use of photocatalysis and sonolysis, i.e. under sonophotocatalytic conditions. The efficiency of the employed advanced oxidation techniques in 1,4-DCB degradation is discussed also in relation to their energy consumption, which might be decisive for their practical application.
Selli
Elena
E
Dipartimento di Chimica Fisica ed Elettrochimica and Center of Excellence CIMAINA, Università degli Studi di Milano, Via Golgi 19, I-20133 Milano, Italy. elena.selli@unimi.it <elena.selli@unimi.it>
Bianchi
Claudia L
CL
Pirola
Carlo
C
Cappelletti
Giuseppe
G
Ragaini
Vittorio
V
D002384:Catalysis; D002722:Chlorobenzenes / Q000737:chemistry / Q000528:radiation effects; D010782:Photolysis; D013010:Sonication; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000528:radiation effects; D018508:Water Purification / Q000379:methods
D002722:Chlorobenzenes; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; C018511:4-dichlorobenzene; D014025:Titanium