Abstract:
Textile industries release large quantities of wastewater containing dyes with a high
toxicity risk. Primary treatment methods are unsatisfactory, advanced oxidation processes
(AOPs) are effective. They allow the total mineralization of pollutants in CO2, H2O and
corresponding mineral acids. The photochemical process during the degradation of OG
has been studied. Photocatalysis in the presence of NIO is more effective than TiO2, 91%
and 85% of OG disappeared after 300 minutes respectively. A parametric study was
performed by UV-Vis spectrophotometer. The results of photochemistry have shown that
the NIO-Oxalic Acid -UV process is effective for the degradation of OG.
In the second study, we chose a silica-based material of SBA-16 type associated with
NIO to degrade OG by catalytic ozonation. The NIO and SBA-16 associated with ozone
greatly improve the degradation of OG. The total degradation of the substrate was
obtained in half the time with NIO or SBA-16 alone. The primary analytical study of
ozonation was confirmed by LC-MS-TOF and led to hydroxyl by-products mainly on
aromatic rings. The formation of tertiary by-products such as: phthalic acid, catechol and
hydroquinone have been observed. The results of the parameter interactions were
obtained through three factorial designs of experiments using NIO, SBA-16 alone
and 1: 1 weight /weight of NIO/SBA-16.
