Adsorption studies of etherdiamine onto modified sugarcane bagasses in aqueous solution
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- 作者：Karla Aparecida Guimar茫es Gusm茫o ; Le ; ro Vin铆cius Alves Gurgel ; T芒nia M谩rcia Sacramento Melo ; Corn茅lio de Freitas Carvalho ; Laurent Fr茅d茅ric Gil
- 关键词：Adsorption ; Etherdiamine Flotigam 2835 ; Modified sugarcane bagasse ; Iron ore flotation
- 刊名：Journal of Environmental Management
- 出版年：15 January, 2014
- 年：2014
- 卷：133
- 期：Complete
- 页码：332-342
- 全文大小：1051 K
文摘
In this study sugarcane bagasse was modified with succinic anhydride and EDTA dianhydride to obtain SCB 2 and EB adsorbents, respectively. These adsorbents were used to remove etherdiamine, which is used for iron ore flotation from single aqueous solutions. The removal and recovery of etherdiamine is important for environmental and economic reasons due to its toxicity and high cost. The results demonstrated that adsorption of etherdiamine by SCB 2 and EB was better fitted by a pseudo-second-order kinetic model than pseudo-first-order and Elovich models. Adsorption isotherms were better fitted by the Langmuir model rather than the Freundlich, Sips, and Temkin models. The maximum adsorption capacities (Qmax) of SCB 2 and EB for etherdiamine adsorption were found to be 869.6 and 1203.5聽mg/g, respectively. The calculated 螖G掳 values for adsorption of etherdiamine on SCB 2 (鈭?2.70聽kJ/mol) and EB (鈭?9.10聽kJ/mol) suggested that chemisorption is the main mechanism by which etherdiamine is removed from the aqueous solution for both adsorbents. The high Qmax values showed that SCB 2 and EB are potential adsorbents for recovering the etherdiamine and treating effluents produced from iron ore flotation.