Adsorption of Ni(II), Pb(II) and Zn(II) on Ca(NO3)2-Neutralised Red Mud
详细信息 查看全文
- 作者：Beatriz Cestaro Pichinelli ; Mariana Scicia Gabriel da Silva…
- 关键词：Ca(NO3)2 ; neutralised red mud ; Trace metals ; Adsorption ; Environmental management
- 刊名：Water, Air, & Soil Pollution
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：228
- 期：1
- 全文大小：
- 刊物类别：Earth and Environmental Science
- 刊物主题：Environment, general; Water Quality/Water Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Soil Science & Conservation; Hydrogeology; Climate Change/Climate Change Impacts;
- 出版者：Springer International Publishing
- ISSN：1573-2932
- 卷排序：228
文摘
This study aimed to investigate a novel method of red mud neutralisation by Ca(NO3)2 (NRM), keeping its adsorption capacity in relation to natural red mud (RM) for Ni(II), Pb(II) and Zn(II). Results pointed out that the neutralisation process decreases the pH and electrical conductivity values on NRM due to reaction between the carbonate and bicarbonate alkalinity of red mud and calcium from calcium nitrate to form calcite (CaCO3). The maximum adsorption capacity values of RM and NRM, respectively, were 1.78 and 1.79 mmol g−1 for Ni(II), 2.13 and 2.23 mmol g−1 for Pb(II) and 1.14 and 1.06 mmol g−1 for Zn(II). Pseudo-second-order model is the main responsible for the adsorption of these metals on RM and NRM. The adsorption reaction is endothermic and these metals have affinity to RM and NRM. Thus, it is possible to neutralise the red mud with Ca(NO3)2 without adsorption capacity losses of Ni(II), Pb(II) and Zn(II).