PECTIN HYDROGEL FROM WATER HYACINTH (EICHHORNIA CRASSIPES) FOR LEAD AND CADMIUM ADSORPTION
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Abstract
The objective of this research was to investigate the lead and cadmium adsorption by using pectin hydrogel extracted from water hyacinth with ester group percentage of 94.13 in solution with pH ranging from 1.0 – 6.0, including adsorption time ranging from 0 – 1,440 minutes at 25 oC. and the initial concentration of lead and cadmium in water was at 100 mg/L. The Langmuir and Freundlich sorption models were used to describe the adsorption isotherms and sorption constant. The research found that lead and cadmium adsorption capacity of pectin hydrogels was the most effective at the pH of 4.0. The equilibrium concentration (QE) of lead and cadmium was at 66.98 mg/g and 58.96 mg/g, respectively. According to the Time Factor, It was found that the optimum time for lead and cadmium release from pectin hydrogels was 60 minutes, and the lead and cadmium liberation values were 67.80% and 70.44 percent, respectively. In terms of isotherms, the lead and cadmium adsorption of pectin hydrogels were more consistent with the Langmere equation than the Fridrich equation. The correlation coefficient (R2) of the isotherm, Langmere equation of lead and cadmium was at 0.97 and 0.99, respectively.
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