Effect of EDTA on divalent metal adsorption onto grape stalk and exhausted coffee wastes
- 作者：Carlos Escudero ; Carmen Gabaldó ; n ; Paula Marzal ; Isabel Villaescusa
- 关键词：Grape stalk ; Exhausted coffee ; Adsorption ; Heavy metals ; EDTA ; Batch and column studies
- 刊名：Journal of Hazardous Materials
- 出版年：2008
- 期刊代码：50_03043894
- 类别：ce
- 出版时间：1 April 2008
- 卷：152
- 期：2
- 页码：476-485
- 文件大小：766 K
摘要
In the present work, two industrial vegetable wastes, grape stalk, coming from a wine producer, and exhausted coffee, coming from a soluble coffee manufacturer, have been investigated for the removal of Cu(II) and Ni(II) from aqueous solutions in presence and in absence of the strongly complexing agent EDTA. Effects of pH and metal–EDTA molar ratio, kinetics as a function of sorbent concentration, and sorption equilibrium for both metals onto both sorbents were evaluated in batch experiments. Metal uptake was dependent of pH, reaching a maximum from pH around 5.5. EDTA was found to dramatically reduce metal adsorption, reaching total uptake inhibition for both metals onto both sorbents at equimolar metal:ligand concentrations.