Papers by Kheira chinoune
Inorganic chemistry communications/Inorganic chemistry communications (Online), May 1, 2024
Applied Clay Science, Apr 1, 2016
BACKGROUND: Water-soluble reactive azo dyes are the most problematic dye house effluents, as they... more BACKGROUND: Water-soluble reactive azo dyes are the most problematic dye house effluents, as they tend to pass through conventional treatment systems unaffected. The release of these compounds into the environment is undesirable and their removal becomes environmentally important. In this work, synthesis, characterization and sorption properties of hydotalcitelike compounds (Mg/Al and Mg/Fe), calcined and uncalcined, were investigated for the removal of the reactive azo dye Remazol Red 3BS. RESULTS: The calcined compounds present higher surface area than the uncalcined. The optimum pH for sorption was found to be 6. Thermodynamic analysis reveals that the sorption is spontaneous and endothermic. Equilibrium data were fitted by a Langmuir model, and kinetic data by a second-order model. The calcined Mg/Al compound showed the highest sorption capacity, at 0.125 mmol g −1. Regeneration of dye loaded derivative is achieved using the surfactant SDS. CONCLUSIONS: The prepared hydotalcite-like compounds and especially calcined Mg-Al exhibited significant adsorption capacity, kinetics, and regenerative ability. Its potential applicability as sorbent should be tested in a large-scale implementation.
Journal of the Taiwan Institute of Chemical Engineers, 2017
Natural geological material (GM) (CEC = 21 meq/100 g, S BET = 3.39 m ²/g), available in large amo... more Natural geological material (GM) (CEC = 21 meq/100 g, S BET = 3.39 m ²/g), available in large amount in Timimoun (South Algeria), was modified with an ammonium quaternary dodecyl-and cetyl-trimethyl ammonium bromide (DTAB and CTAB, respectively). The X-ray diffraction (XRD) revealed that the natural geomaterial represents mainly muscovite mica; and organic molecules salts were not intercalated in the interlayers; the modification process was thus limited to the surface. Adsorption of 2,4-dichlorophenol (2,4-DCP) from aqueous solution via batch sorption experiments onto GM, GM-DTAB, and GM-CTAB was investigated. The results show increased 2,4-DCP adsorption on the GM composites compared to natural GM. The maximum uptake occurred at pH = 6, a contact time of 60 min, and an adsorbent dose of 4 g/L. The surface modification of muscovite by quaternary ammonium bromide and sequential adsorption of 2,4-DCP were also evaluated by XRD and FTIR. The kinetic adsorption data were in good agreement with a pseudo-second-order model. Freundlich adsorption model was best to describe adsorption equilibrium data for 2,4-DCP onto GM-DTAB and in the case of GM-CTAB, experimental data agree well with the Langmuir isotherm model. The monolayer adsorption capacity (q m) was 110.75 mg/g for GM-DTAB, 239.8 mg/g for GM-CTAB, and 354.6 mg/g for activated carbon.
Springer Proceedings in Energy, 2016
Cetyltrimethylammoniumbromide-bentonite (CTAB-bentonite) was synthesized by placing alkylammonium... more Cetyltrimethylammoniumbromide-bentonite (CTAB-bentonite) was synthesized by placing alkylammonium onto B-Na+, and investigated for adsorption of reactive Blue 2 dye from aqueous solution. The adsorption capacity of reactive blue 2 onto organo-bentonite was found to increase with the dye concentration. The evaluated activation energy was found as 8.02 kJ/mol. Equilibrium adsorption isotherms were satisfactorily described by Langmuir model.
Uploads
Papers by Kheira chinoune