Removal Of Methylene Blue Dye By Polyvinyl Alcohol/Multi-Walled Carbon Nanotubes Adsorbents
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Date
2021-06-01
Authors
Zamri, Nurul Najihah
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Nowadays, water pollution becomes a serious issue in most of the country due to the
development industry around the world. Textile industries is a popular sector that uses dyes that
cause lots of water removed are contaminated. In this study, PVA and PVA/MWCNTs adsorbent
were synthesized by using the phase inversion method to be used as an adsorbent to remove the
methylene blue (MB) dye. Several parameters such as initial concentration, contact time and, the
adsorbent dosage were studied to evaluate the performance of adsorbents. Based on the results,
PVA/MWCNTs adsorbents was able to remove 46.58% of MB while the PVA adsorbents was
able to eliminate 44.71% of MB at equilibrium state with an initial concentration is 2 mg/L. Hence,
PVA/MWCNTs adsorbent was found to be the more efficient to remove the MB compare to the
PVA adsorbent. From the equilibrium data, the two models were used to illustrate the adsorption
isotherm, which is Langmuir, and Freundlich isotherm. In this experiment, it was found that the
Langmuir models were suitable to explain the adsorption of MB dye in this process that shown a
single layer adsorption was formed on the adsorbents. While the kinetic studies showed that the
pseudo-second-order kinetic models were involved that describes that the chemisorption process
has taken place in this adsorption process. In addition, it can be proven with the adsorption capacity
obtained by using this model more closely to the experimental result.