TITLE:
Adsorption of Anionic and Cationic Dyes from Textile Effluents by Activated Carbon Prepared from Sawdust and Fish Scale
AUTHORS:
Rumana A. Jahan, Md. Mahedi Hassan, Ashequl Alam Rana, Mohammad Mainul Karim
KEYWORDS:
Textile Wastewater, Ionic Dyes, Removal, Activated Carbon, Adsorbent
JOURNAL NAME:
Advances in Chemical Engineering and Science,
Vol.13 No.3,
June
12,
2023
ABSTRACT: In Bangladesh, there are thousands of textile-dying industries
spread across the country’s many
regions, the majority of which involve knitting and dying. The dyeing industry
uses an enormous quantity of water, as well as colors and chemicals. After the
dying process has been completed, they also release a significant amount of
wastewater. Cotton, wool, and polyester fiber are typically dyed with textile
dyes such as reactive, acid, and disperse dyes. These dyes are utilized most
frequently in the respective sectors. The dyes’ colorants are extremely poisonous and dangerous to
all forms of life, including aquatic life and living things. The present work
has been intended to investigate whether or not it is practicable to remove
commonly used textile dyes simultaneously from an aqueous dye solution using an
adsorption technique that makes use of a variety of different adsorbents. This
study focuses on the removal of color from two distinct types of dyes—Methylene
Blue and Reactive Blue-250 which are cationic and anionic in nature
respectively, using two different types of activated carbon adsorbents prepared
from sawdust and fish scale. Dye removal capacity was tested as a function of
contact time, the dosage of the adsorbent, pH during the treatment process,
temperature and initial concentration of dye. The applicability of the Langmuir
and Freundlich adsorption isotherms in describing experimental data was
investigated. The micro and mesoporous activated carbon prepared from sawdust
and fish scale identified by Scanning
Electron Microscopy (SEM) images indicated that such adsorbents with a
large surface area have more dye adsorption potential whereas the variation in
dye adsorption occurs due to variation in surface area. From the overall experimental data, maximum removal of 95.39% and 87.92% was found for Methylene Blue and Reactive Blue-250 respectively by sawdust, and
90.64% removal of Methylene Blue by using fish scale.