| dc.description.abstract | Traditional textile finishing industry consumes about 100 liters
of water to process about 1 Kg of textile materials, it has been estimated
that about 10% of the dye used in the process does not bind
to the fibers. This wastewater creates environmental problems due
to the generation of hazardous degradation products from dyes. In
wastewater treatment plants dyes remain unchanged and are discharged
to rivers. Additionally there are some advanced treatment
systems to discolored the textile dye but they are expensive. The
aim of this study was to test different materials: a) lemon peel, b)
melon peel, c) orange peel and d) chayote peel, to discolor solutions
of three textile dyes: i) indigo carmine, ii) direct brown 2 and
iii) direct black 22. The different peels were blended with water,
centrifuged and filtered with paper to get the extract; then the
enzymatic extract was incubate with the dye solution at room temperature
and with magnetic stirrer during 24 hours Periodically it
was taken samples and analyzed with the UV-Vis spectrophotometer,
and it was calculated the % of discoloration by measuring the
absorbance changes. Lemon, orange and chayote peels discolored
both the indigo carmine and the direct brown 2 solution in different
percentage; melon peel only discolored the indigo, whereas direct
black 2 did not have an important discoloration with any of the
biological materials. Indigo was discolored easily than others dyes,
because it redox potential is the lowest of the three dyes. For indigo,
discoloration reached 19% using melon shell, 56% using chayote
shell, 50% using lemon and 21% using orange peel, in 24 hours.
Results are very interesting because we have demonstrated that
cheap material like vegetable peels can be used to treat some textile
dye solutions efficiently. | |
