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Removal of Congo Red from Aqueous Solutions by Perlite
Author(s) -
Vijayakumar Govindasamy,
Dharmendirakumar Mahendradas,
Renganathan Sahadevan,
Sivanesan Subramania,
Baskar Gurunathan,
Elango Kuppannagounder P.
Publication year - 2009
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.200800228
Subject(s) - adsorption , aqueous solution , congo red , freundlich equation , gibbs free energy , enthalpy , fourier transform infrared spectroscopy , langmuir , chemistry , langmuir adsorption model , nuclear chemistry , scanning electron microscope , analytical chemistry (journal) , materials science , chromatography , chemical engineering , organic chemistry , thermodynamics , composite material , physics , engineering
The removal of Congo red dye from an aqueous solution using perlite, a volcanic siliceous rock, as a low cost adsorbent was studied. Adsorption experiments were carried out as batch studies at different adsorbent dose, pH, temperature and initial dye concentration. The dye adsorption equilibrium was rapidly attained after 40 min of contact time. The adsorbent was characterized by Fourier Transform Infrared spectroscopy (FTIR), X‐ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). Langmuir and Freundlich isotherms were studied for the adsorption data over a concentration range of 20 to 100 mg/L. The thermodynamic parameters such as entropy of adsorption (Δ S 0 ), enthalpy of adsorption (Δ H 0 ) and Gibbs free energy of adsorption (Δ G 0 ) were obtained and analyzed. Kinetic studies showed that the adsorption process obeyed the pseudo first order kinetic model. The dimensionless separation factors ( R L ) showed that perlite could be used to remove Congo red from an aqueous solution.