Optimization of Tannin Gel Synthesis from Eucalyptus Bark Extract
Keywords:
Resin, Methylene blue, AdsorbentAbstract
The objective of this research was to evaluate the optimal condition for tannin gel synthesis from Eucalyptus bark extract. The central composite design (CCD) was used to design the experiments and response surface methodology (RSM) was used to evaluate the optimal condition. The effects of mass ratio of formaldehyde to tannin and the reaction temperature on adsorption performance of synthesized tannin gel were investigated. Tannin gel was tested with initial Methylene blue (cationic dye) concentration of 20 ppm and dosage tannin gel of 20 mg. It was found that main variables have an effect on Methylene blue removal significantly (P-value < 0.05) while the interaction between variables were not significant (P-value > 0.05). The optimum condition was obtained at mass ratio of formaldehyde to tannin of 3.1:1 and the reaction temperature of 80 ๐C. The adsorption isotherm was fitted with the Langmuir adsorption model with the maximum adsorption capacity of 135 mg/g. The tannin gel synthesized from Eucalyptus bark extract has a potential to use as an adsorbent for removal of cationic dye from aqueous solutions.
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