Solar photocatalytic degradation of orange G dye based on zinc oxide / Nur Aisyah Hamzah

Solar photocatalytic was a widely used of energy sources that combine the
solar or sunlight and chemical to acquire the chemical reaction The
objective of the study are to investigate the degradation of OG under
different condition with sunlight and without sunlight as the irradation
sources. It also to evaluate the efficiency of solar photocatalytic degradation
in the presence of radical scavengers and in the presence of co - catalyst. .
Based on this study, to remove the color of wastewater pollution, a
photocatalytic process was used to examine the rate of Orange G (OG)
degradation efficiency by using a zinc oxide (ZnO) as semiconductor and
illuminated by solar light. The OG was used as an example of dye and the
degradation process are totally depends on the OG decreasing color. From
this degradation, the chemical reaction between the semiconductor and dye
can be illustrated and it undergoes the definition of solar photocatalytic
itself. The chemical reaction was formed when ·OH radical was attacked
towards the OG or heteropolyaromatic and leading to hydroxylated
metabolites. The reaction also involved when the ZnO semiconductor reacts
with addition of energy such as solar irradation to release heat. At this time,
the holes of semiconductor trapped the ·OH radical to form a simple
compound. According to the observation of experiment, the OG solution
was almost completely degraded by the solar irradation, but the OG slightly
degraded when the solar light was absence. In the presence of radical
scavengers, the inhibition of degradation of OG process are failed to occurs.
It is the same with the presence co - catalyst, the speed up degradation
process are failed to occurs.