Abstract:
Activated carbon was prepared from date palm seed using one step procedure with 56.54 % efficiency, 2.89 % ash content, 781.40 m2 G-1 surface area, 711.2 mg G-1 iodine number and the CHN analysis gave 69.25 % C, 3.91% H and 1.56% N. The FTIR spectroscopy revealed O-H, C-H, C≡C, C=C and C-O stretching; XRF revealed P, Ca, Si, S and K as major elements. The influences of agitation time, initial dye concentration, adsorbent dose and temperature were studied in batch experiments. A 57.78% Alizarin and 68.40% Fluorescein removal were attained within the first 15 min of agitation. Kinetic studies showed good correlation coefficient for pseudo-first and pseudo- second order kinetic models. The adsorption data fitted well into Langmuir isotherm than Freundlich isotherms with correlation coefficient (R2) very close to unity and Langmuir maximum adsorption constant, qm > 1000. The Freundlich coefficients relating to overall adsorption capacity, Kf (mg G-1) is 197.65 and 396.28 and surface heterogeneity, n is 3.34 and 3.18 for Alizarin and Fluorescein respectively. The activation energy (Ea) of the adsorption process of alizarin and fluorescein on DPA were found to be -8.19 and +21.43 Kj mol-1 respectively. The evaluation of the thermodynamic quantities showed that the adsorption process was spontaneous and endothermic.
Page(s):
604-614
DOI:
DOI not available
Published:
Journal: Journal of Chemical Society of Pakistan, Volume: 38, Issue: 4, Year: 2016