الفهرس 
Title : Photo-degradation of azo dyes in wastewater by using Nano-metals
AbstractOnly 14 pages are availabe for public view
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Abstract
Water pollution has gained a lot of attention worldwide because
wastewaters from various industrial sectors cause serious environmental and
health problems. The wastewater from the textile industry containing even a
very low concentration of dyes can cause waste streams to become intensely
coloured. Crystal violet (CV) dye is a well-known dye that is used in a variety
of ways such as a biological stain, dermatological agent, veterinary medicine,
additive to poultry feed to inhibit propagation of mould, intestinal parasites
and fungus. CV is well known for its mutagenic, teratogenic and mitotic
poisoning nature as well as low biodegradability. Furthermore, CV is the
brightest water-soluble class; therefore, the existence of CV molecules in
solution even at a low concentration of 1.0 mg L
-1 can cause several inhibitive
effects on the photosynthesis of aquatic plants. Therefore, it is essential to
decolourize CV dye-laden water or remove it from aquatic environments.
Nanocatalysts are capable to decrease the amount of hazardous by-products.
The effect of different photocatalysts (MgO NPs, NiO NPs and CaO NPs) on
the photocatalytic degradation of crystal violet (CV) was studied. The
degradation efficiency reached to 99.19%, 95.58% and 90.07% at 130 min
with MgO NPs, NiO NPs and CaO NPs, respectively. MgO NPs have the best
performance in photodegradation, so MgO NPs was chosen to complete the
study