研究论文
刘峰,刘锐平,刘会娟,曲久辉.铁锰复合氧化物同时吸附锑镉性能研究[J].环境科学学报,2013,33(12):3189-3196
铁锰复合氧化物同时吸附锑镉性能研究
- The adsorptive behaviors of Fe-Mn binary oxides towards antimony and cadmium
- 基金项目：国家高新技术研究发展计划项目（No. 2012AA062604）
- 作者
- 单位
- 刘峰
- 1. 中国科学院生态环境研究中心 环境水质学国家重点实验室, 北京 100085;
2. 中国科学院大学, 北京 100049
- 刘锐平
- 1. 中国科学院生态环境研究中心 环境水质学国家重点实验室, 北京 100085
- 刘会娟
- 1. 中国科学院生态环境研究中心 环境水质学国家重点实验室, 北京 100085
- 曲久辉
- 1. 中国科学院生态环境研究中心 环境水质学国家重点实验室, 北京 100085
- 摘要：以五价锑（Sb（V））和镉（Cd2+）为对象，考察了二者单独存在和共存体系下铁锰复合氧化物（FMBO）对其吸附性能，探讨了Sb（V）（或Cd2+）的吸附对Cd2+（或Sb（V））吸附的影响.研究发现，单独存在体系下Sb（V）和Cd2+的吸附常数KF分别为0.48和1.13 L·mg-1，而共存体系下则分别提高至1.88和1.51 L·mg-1；Elovich动力学模型可较好地描述共存条件下Cd2+与Sb（V）在FMBO表面的吸附，表明该体系的吸附为多层吸附且为非均相扩散过程；吸附48 h后Sb（V）和Cd2+的最大吸附量分别达到0.32和1.43 mmol·g-1；Sb（V）在偏酸性而Cd2+在偏碱性pH范围具有较好的吸附效果.Sb（V）（或Cd2+）通过改变FMBO表面ζ电位和反应平衡pH等机制影响Cd2+（或Sb（V））的吸附.此外，XPS和吸附后水相铁锰浓度结果显示，Cd2+可能与FMBO体相中Mn2+进行晶格置换并促进Mn2+的溶出，进而促进了Sb（V）的吸附.
- Abstract：The adsorption behaviors of Fe-Mn binary oxides (FMBO) towards antimony (Sb(V)) and cadmium (Cd2+) in single and co-existed systems were investigated, and the mutual effects between Sb(V) and Cd2+ were analyzed. Results indicated that the KF constants of Sb(V) and Cd2+ in Freundlich isotherm were 0.48 and 1.13 L·mg-1 in single system, and increased significantly to 1.88 and 1.51 L·mg-1 in the co-existed system. The Elovich dynamic model can well describe the adsorption of Cd2+ and Sb(V) on FMBO in the co-existed system, indicating the multi-layer adsorption with heterogeneous diffusion. After 48 h, the maximum adsorption capacities towards Sb(V) and Cd2+ were 0.32 and 1.43 mmol·g-1, respectively. The adsorption of Sb(V) was favored at acidic pH range. By contrast, Cd2+ adsorption was favored at alkaline condition. After the adsorption of Cd2+ (Sb(V)), the ζ-potential of FMBO and equilibrium pH changed, which affected the adsorption of the Cd2+ (Sb(V)). The concentrations of Fe and Mn increased significantly in the presence of Cd2+. Accordingly, the elevated ratio of Fe to Mn was confirmed by the XPS analysis. It was concluded that Cd2+ facilitated the dissolution of Mn2+ from FMBO and therefore increased the adsorption of Sb(V).
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