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Batch and continuous adsorption of crystal violet and congo red by raw coconut fiber
Author : Sneha Tomar, A. B. Soni and R. Manivannan*
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ABSTRACT
In this study, raw coconut fiber (Cocosnucifera) was employed as an adsorbent for elimination of cationic dye and anionic dye viz. crystal violet (CV) and congo red (CR) respectively. Batch adsorption experiments were performed at identical conditions to understand the impact of parameters viz. initial concentration (6 to 100 mg/L), adsorbent dosage (0.05 to 3.5 g), contact time (10 to 150 min), pH (3 to 11) over adsorption. Experimental results revealed that the maximum CV removal of 99% was obtained at pH 11 and CR removal of 82% at pH 3. The equilibrium data was best denoted by Langmuir isotherm demonstrating monolayer deposition with maximum adsorption capacity of 32.8 mg/g for CV and 27.6 mg/g for CR at 50ºC. The kinetic study results shows that the adsorption of CV and CR is well described by pseudo-second order model by R2 value (>0.99). Degree of crystallinity and functional groups of the adsorbent were analyzed using XRD and FTIR respectively. The results suggest that raw coconut fiber showed strong adsorption for cationic dye than anionic dye. Continuous adsorption study was additionally performed in order to check the feasibility of the adsorbent if employed practically.
KEYWORD
Raw coconut fiber, crystal violet, congo red, column study