It is found that the ferric ions, as a catalyst, have a weak effect on the
oxidation of luminol "triaminophtal hydrazid" by (DPCA) and through chemiluminescence
reaction. For increasing the catalytic activity of ferric ions we
used organic and non
organic compounds. The best compound was o –
phenathroline. It forms two different complexes with ferric (A) and ferrous (B)
ions (A, B). The formation of hydrolyzed mixture of the complexes (Ph-Fe3+)
depends on the pH. We found that (Ph-Fe3+) complex was very effective in
chime-luminescence process above mentioned.
Phenolic compounds are known to be present in high concentration
in various of agro industrial wastes such as olive mill wastewater. As
they are highly biorecalcitrant a possible treatment by Advanced
Oxidation Processes has to be investigated.
T
he photocatalytic degradation of the phenolic acids p-Hydroxybenzoic
acid, Dihydroxybenzoic acid, gallic acid, vanillic acid, syringic acid) in the
presence of TiO2 deposit on a glass plate has been reported. A comparison for
the adsorption properties and the kinetics of reaction have been studied. The
kinetics were found to be first order for all compounds and were compared
with the compounds’ structures. The reaction rate for the compounds was
found as the order Di-HBA < GA < p-HBA ≈ SA ≈ VA.
The influence on the photdegradation rate of various parameters as pH, and
substrate’s concentration was studied for p-Hydroxybenzoic acid only. It was
found that the reaction is pH and substrate’s concentration dependence.
A removal efficiency (50-70%) was determined after 5hr using UVlamp
(15W- λ=360nm) and it increased up to 95% when H2O2 was
added.
