Author/Authors :
Jain، M. نويسنده , , Garg، V. K. نويسنده , , Garg، U. K. نويسنده Department of Applied Sciences, Adesh Institute of Engineering & Technology, Faridkot (Punjab), India , , Kadirvelu، K. نويسنده , , Sillanp??، M. نويسنده Laboratory of Green Chemistry, Department of Chemistry, Lappeenranta University of Technology, Sammonkatu 12, FI-50130 Mikkeli, Finland ,
Abstract :
This study reports the removal of cadmium from wastewater in batch mode, using two
carbonaceous adsorbents viz. Sunflower Head Carbon (SHC) and Sunflower Stem Carbon (SSC) prepared
from waste biomass of sunflower. The adsorbents were characterized by Fourier Transform Infrared
Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Analysis (EDX).
The results of batch experiment showed that the cadmium removal was dependent on pH, Cd(II) ion
concentration, adsorbent dose, contact time and temperature. The highest cadmium adsorption was found at
pH = 6.0, initialCd(II) concentration = 100 mg/L, adsorbent dose = 20 g/L, contact time = 120 min at temperature
= 25±1°C and at 180 rpm. Langmuir and Freundlich isotherm models were applied and Freundlich model was
found to fit the data well. The Freundlich adsorption capacity was 1.22 and 1.48 mg/g by SHC and SSC. The
kinetic data was well described by pseudo-second-order model with coefficient of correlation 0.9978 for SHC
and 0.9981 for SSC. The adsorption process was found to be endothermic in nature. The adsorbents were
desorbed using different strengths of HCl ranging from 12.5 mM to 200 mM. The highest desorption efficiency
i.e. 55.6 and 52.6% from SHC and SSC was found at 125 mM.
