Adsorption of methylene blue dye from liquid phase by carbon nanotube-infused poly (vinyl) alcohol membrane
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Date
2018-06
Authors
Ng, Zhi Heng
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Abstract
The PVA membrane and PVA incorporated with carbon nanotube (PVA/MWCNT)
nanocomposite membrane were used as adsorbent to remove methylene blue from
aqueous water. Several conditions of adsorption such as contact time, temperature and
initial concentration of methylene blue were also investigated to determine the optimum
condition of the adsorption. After 4 hours, there was no visible change in the removal of
methylene blue (MB) dye on PVA membrane and PVA/MWCNT nanocomposite
membrane surface. The adsorption capacity at equilibrium for PVA membrane was 0.102
mg/g while PVA/MWCNT nanocomposite membrane was 0.146 mg/g at 20℃. It was
found that 4 hours is the optimized contact time for the adsorption process. The adsorption
capacity of PVA membrane decreases while adsorption capacity of PVA/MWCNT
nanocomposite membrane increases with increase in the initial concentration of MB dye
from 1.0 mg/L to 4.0 mg/L. Besides, the adsorption capacity of PVA membrane decreases
while adsorption capacity of PVA/MWCNT nanocomposite membrane increases with
increase in the temperature from 25℃ to 40℃. On the other hand, the adsorption
equilibrium data for PVA membrane was found to be well fitted with the type I of the
Langmuir isotherm model while for PVA/MWCNT nanocomposite membrane it was
found to be well fitted with both type I and type II of Langmuir isotherm model.
Adsorption kinetics of MB dye removal using PVA membrane and PVA/MWCNT
nanocomposite membrane was better described by pseudo-second order model.