title: Application of montmorillonite-Cu(II)ethylenediamine catalyst for the decolorization of Chromotrope 2R with H₂O₂ in aqueous solution.
abstract: The kinetics of decolorization of Chromotrope 2R (C2R) was studied spectrophotometrically using the montmorilloniteK10-Cu(II)ethylenediamine composite (MMTK10-Cu(en)2) as catalyst and H2O2 as oxidant in aqueous solution. The catalyst was prepared and characterized by SEM, FTIR, XRD and TGA techniques. The dependence of reaction rate on H2O2 concentration was examined under UV irradiation in the presence and absence of the catalyst, and in the presence of the catalyst without the UV irradiation. In all these reaction systems, the rate increased up to a maximum value and then decreased. The rate increased with increasing the concentration of the dye reaching a maximum. Also, the rate of decolorization reaction showed a significant increase with increasing the amount of the catalyst and temperature. The addition of NaCl to the reaction medium has accelerated the rate effectively. A similar catalyst, MMTKSF-Cu(en)2, has also been employed and was found to be less efficient compared with MMTK10-Cu(en)2.
authors.affiliation: Chemistry Department, Faculty of Science, Tanta University, Tanta 31527, Egypt. Electronic address: dr.ibrahimsalem@science.tanta.edu.eg.
authors.forename: Ibrahim A
authors.initials: IA
authors.lastname: Salem
authors.affiliation: Chemistry Department, Faculty of Science, Tanta University, Tanta 31527, Egypt.
authors.forename: Hoda A
authors.initials: HA
authors.lastname: El-Ghamry
authors.affiliation: Chemistry Department, Faculty of Science, Tanta University, Tanta 31527, Egypt.
authors.forename: Marwa A
authors.initials: MA
authors.lastname: El-Ghobashy
mesh_terms: D001546:Bentonite / Q000737:chemistry*; D002384:Catalysis; D003116:Color; D003300:Copper / Q000737:chemistry*; D005029:Ethylenediamines / Q000737:chemistry*; D016166:Free Radical Scavengers / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007700:Kinetics; D009282:Naphthalenesulfonates / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013818:Thermogravimetry; D014961:X-Ray Diffraction
chemical_list: D005029:Ethylenediamines; D016166:Free Radical Scavengers; D009282:Naphthalenesulfonates; D012996:Solutions; D001546:Bentonite; C070620:chromotrope 2R; D012965:Sodium Chloride; C031234:ethylenediamine; D003300:Copper; D006861:Hydrogen Peroxide
keywords: Chromotrope 2R; Copper(II)-ethylenediamine complex; Decolorization; H(2)O(2); Montmorillonite; Textile dyes