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Removal of nitrate from aqueous solution by using red mud
Scopus
Toplam 230 atıf DOI
The objective of this study is to remove the nitrate from aqueous solution by using the original and activated red mud in batch adsorption technique. The effects of pH, adsorbent dosage and contact time on the adsorption were investigated. The nitrate adsorption capacity of activated red mud was found to be higher than that of the original form and decreased above pH 7. Adsorption process was expressed by using Langmuir and Freundlich isotherms. Langmuir isotherm curves was found to be significant compared to Freundlich isotherm. Adsorption capacity of the original and activated red mud was found to be 1.859 and 5.858 mmol nitrate/g red mud, respectively. It was found that sufficient time for adsorption equilibrium of nitrate ions is 60 min. The mechanism for nitrate removal was explained by considering of chemical nature of red mud and interaction between metal oxides surface and nitrate ions. © 2006 Elsevier B.V. All rights reserved.
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Increasing the phenol adsorption capacity of neutralized red mud by application of acid activation procedure
Scopus
Havuzumuzda 53 atıf almış
The objective of this study was to investigate the removal of phenol from aqueous solution by using acid activated red mud in batch adsorption experiments. The study was carried out as functions of pH, contact time, activated red mud dosage and initial phenol concentration. It was found that the maximum removal was obtained at pH below 8 and the adsorption equilibrium time was 10 h. Adsorption was followed the pseudo second-order kinetic model. According to the coefficient of determination and non-linear regression analysis carried out by Chisquare test, the Langmuir isotherm better represented the adsorption data in comparison to the Freundlich isotherm. The phenol adsorption capacity of the activated red mud (8.156 mg/g) was found to be higher than that of the neutralized red mud (4.127 mg/g) at pH 6 and 25±1°C. Negative ΔG0 value (-22.692 kJ/mol) indicated that the adsorption of phenol onto the activated red mud was spontaneous and feasible process. © 2008 Elsevier B.V. All rights reserved.
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Kurumlar (1)
Selçuk Üniversitesi
Selçuklu, Turkey