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Removal of Congo Red from Aqueous Solution by Sorption on Organified Rectorite
Author(s) -
Liu Yi,
Wang Wenbo,
Wang Aiqin
Publication year - 2010
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.200900130
Subject(s) - sorption , aqueous solution , adsorption , congo red , langmuir adsorption model , enthalpy , gibbs free energy , chemistry , langmuir , bromide , chemisorption , fourier transform infrared spectroscopy , nuclear chemistry , inorganic chemistry , chemical engineering , organic chemistry , thermodynamics , engineering , physics
Batch sorption technique was carried out for the removal of anionic dye Congo red (CR) from aqueous solution using raw rectorite (R‐REC) and organified rectorite (CTA + ‐REC) modified by cetyltrimethylammonium bromide (CTAB) as adsorbents. The effects of organification degree of CTA + ‐REC as well as the process parameters including the pH of dye solution, sorption time, and initial dye concentration on adsorption capacity for CR were investigated and the sorption kinetics was also evaluated. The results showed that the sorption behaviors of R‐REC and CTA + ‐REC for CR followed pseudo‐second‐order kinetic model and the sorption equilibrium data perfectly obeyed the Langmuir isotherm. The thermodynamic parameters including entropy of sorption (Δ S 0 ), enthalpy of sorption (Δ H 0 ), and Gibbs free energy of sorption (Δ G 0 ) were obtained and analyzed. Fourier transform infrared study revealed that a chemisorption process occurred between CR and CTA + ‐REC. REC modified by cationic surfactants showed the higher adsorption capacities for CR compared to R‐REC and in theory would be used as an efficient and promising adsorbent for the removal of anionic dyes in wastewater treatment.