Photolysis, Sonolysis and Ozonolysis for Degradation of 2,4-dichlorophenoxyacetic acid (2,4-D)

2,4-dichlorophenoxyacetic acid (2,4-D) is well known as inexpensive herbicides, but it can give rise to undesirable pollution. The objective of this investigation was to compare effectivity of photolysis, sonolysis and ozonolysis
methods for degradation of 2,4-D. Photolysis method were performed using an irradiat ion of UV light λ= 365 nm, sonolysis using an ultrasound with output power of
60 Watt, and ozonolysis using an bioozone generator. The optimum condition for degradation of 2,4-D by photolysis, sonolysis, and ozonolysis without anatase-TiO were found at pH = 3,5; while degradation of 2,4-D by photolysis and sonolysis with addition anatase-TiO was optimum at pH = 2,5. Percentage degradation of 2,4-D by sonolysis, photolysis, and ozonoliysis without anatase-TiO2 after 180 minutes was 71,85%, 76,12%, and 77,40% respectively. With addition anatase-TiO2, the percentage
degradation of 2,4-D by sonolysis was 78,98% while 82,59% of degradation was achieved by photolysis within 180 minutes treatment. This investigation finding shows
that for degradation of 2,4-D without anatase-TiO
effectivity of ozonolysis better than photolysis and sonolysis methods, while whit addition anatase-TiO2
photolysis better than sonolysis methods.