title: Comparative study of raw and chemically treated mangrove leaf for remediation of 304 Methyl Violet 2B dye from aqueous solution: thermo-kinetics aspect.
abstract: The adsorption process is the most attractive alternative way for the treatment of industrial effluents. The main objective of the study is to compare the efficacy of adsorption by raw and chemically treated forms of mangrove plant leaf powder. It acts as adsorbent, and would not only be economical but also help to reduce pollution. The adsorbent was characterized by Fourier transform infra-red spectroscopy and scanning electron microscopy. Results showed that percent removal of dye was higher by chemically treated mangrove leaf (98%) than by raw mangrove leaf (75%) under all determined conditions. The equilibrium and kinetics adsorption data were analyzed by the Langmuir isotherm and the pseudo second order model. They were found to be the best fit to interpret the present data. The thermodynamic parameters were calculated by using the Langmuir equilibrium constant. Results suggested that dye adsorption on mangrove leaf was a spontaneous and exothermic process with enthalpy change = -15.26 kJ/mol, and there was decrease in disorder with entropy change = -5.089 kJ/mol K.
authors.affiliation: Department of Chemistry, University of Karachi, Karachi 75270, Pakistan E-mail: banobakht@gmail.com.
authors.forename: Bakht
authors.initials: B
authors.lastname: Bano
authors.affiliation: Department of Chemistry, University of Karachi, Karachi 75270, Pakistan E-mail: banobakht@gmail.com.
authors.forename: Erum
authors.initials: E
authors.lastname: Zahir
mesh_terms: D000327:Adsorption; D032407:Avicennia / Q000737:chemistry*; D019277:Entropy; D005840:Gentian Violet / Q000737:chemistry*; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D018515:Plant Leaves / Q000737:chemistry*; D011208:Powders; D012394:Rosaniline Dyes; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D011208:Powders; D012394:Rosaniline Dyes; D014874:Water Pollutants, Chemical; C005095:malachite green; D005840:Gentian Violet