title: Removal of congo red from aqueous solution by adsorption onto acid activated red mud.
abstract: The objective of this study is to remove the congo red (CR) anionic dye, from water by using the acid activated red mud in batch adsorption experiments. The effects of contact time, pH, adsorbent dosage and initial dye concentration on the adsorption were investigated. The pH of the dye solution strongly affected the chemistry of both the dye molecules and activated red mud in an aqueous solution. The effective pH was 7.0 for adsorption on activated red mud. It was found that the sufficient time to attain equilibrium was 90 min. The adsorption isotherms were analyzed using the Langmuir, the Freundlich, and the three parameter Redlich-Peterson isotherms. The Langmuir isotherm was the best-fit adsorption isotherm model for the experimental data obtained from the non-linear chi-square statistic test.
authors.affiliation: Selcuk University, Department of Environmental Engineering, Campus, 42031 Konya, Turkey. ali.alitor@gmail.com
authors.forename: Ali
authors.initials: A
authors.lastname: Tor
authors.forename: Yunus
authors.initials: Y
authors.lastname: Cengeloglu
mesh_terms: D000327:Adsorption; D000537:Aluminum Oxide; D004396:Coloring Agents / Q000302:isolation & purification*; D003224:Congo Red / Q000302:isolation & purification*; D007220:Industrial Waste; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D004396:Coloring Agents; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D003224:Congo Red; D000537:Aluminum Oxide