Abstract:
The feasibility of using chitin as an adsorbent for cadmium (II) was examined. The adsorption characteristics were studied as a function of solution pH, temperature, contact time et. al., Maximum uptake amount of cadmium (II) was estimated to 93.9 mg/g • chitin by saturated capacity method at pH 5.41 in the HAc-NaAc system. The isotherm data for cadmium (II) at pH 5.41 fitted well to a Langmuir equation with a sorption capacity of 94.3 mg/g • chitin which was in accordance with the maximum uptake amount by means of the saturation method. The apparent adsorption rate constant was K288k = 3.34x 10-5s-1, K298k = 4.60x 10-5s-1, K308k = 6.35x 10-5s-1 and K318k = 9.89x 10-5s-1. The apparent activation energy was 63.1 kJ/mol. Thermodynamic parameters, ΔG298K was calculated to be -19.5 kJ/mol, ΔH and ΔS were found to be 10.6 kJ/mol and 101 kJ/mol•K, respectively. Adsorption mechanism was also proposed using infrared spectroscopy technique (IR).
Page(s):
429-435
DOI:
DOI not available
Published:
Journal: Journal of Chemical Society of Pakistan, Volume: 32, Issue: 4, Year: 2010