Kinetics and Isotherm studies for the Adsorption of Methylene blue dye using Titanium dioxide nanotube
Keywords:
Nanoadsorbents, Titanium dioxide nanotube,, Methylene blue dye, Hydrothermal method,, Adsorption, CharacterizationAbstract
Textile effluents are known to be very toxic and carcinogenic. Methylene blue dye, which is one of the dyes that are
frequently used in the textile industries pose a lot of treat to the environment. It is very pertinent to treat these effluents
generated from these industries before releasing them into the environment. This research investigated the kinetics and
isotherm models of methylene blue dye adsorption using titanium dioxide nanotubes. Titanium dioxide nanotube used
in this work was prepared using sol-gel/hydrothermal method with 500oC calcination temperature. The nanoadsorbent
was characterized using SEM, FTIR and TEM. The TEM result showed the successful synthesis of titanium dioxide
nanotubes. The influence of process parameters was studied using a batch adsorption process. The adsorption
experiment showed that the highest percentage removal was attained at 5minutes, 0.1 g and 100mg/l for the effects of
time, dosage, and initial dye concentration, respectively. Freundlich isotherm model gave the best fit to the isotherm
data with R2 value of 0.9943. The closeness of the experimental and calculated qe values via 0.14mg/g and 0.17mg/g
respectively indicate that the process is favorable to the Freundlich isotherm model. Pseudo-second-order model
showed the best fit to the kinetic data with R2 value of 0.9986. Titanium dioxide nanotubes prepared through the routes
used in this investigation is very viable for the removal of MB dye.
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