不同形貌锰氧化物对重金属离子吸附的AAS和AFS分析

Adsorption of Heavy Metal Ions on Two Types of Manganese Oxides Analyzed by AAS and AFS

通过简单的水热法控制性合成了两种不同形貌的锰氧化物(层状OL和隧道状OMS),并考察了这两种材料对几种重金属离子Pb2+,Cu2+,Ni 2+,Hg2+的吸附。通过原子吸收光谱(AAS)和原子荧光光谱(AFS)测定吸附前后离子浓度,比较两种材料的吸附性能,以及对不同离子的选择性吸附。实验表明OMS形貌的锰氧化物是一种良好吸附剂,对铅离子具有很好的选择性吸附,两分钟内吸附率达98%。由此可建立一种简单、绿色、高效地去除污水中重金属离子的方法。

Two types of manganese oxides, the octahedral layer structure（OL） and the octahedral molecular tunnel structure （OMS）, were controllably synthesized via a facilely hydrothermal route and used to remove heavy metal ions（Pb^2＋, Cu^2＋, Ni^2＋ , Hg^2＋ ） in solutions. The heavy metal ion concentrations before and after adsorption were determined by atomic absorption spectroscopy （AAS） and atomic fluorescence spectroscopy （AFS） to evaluate the material adsorption performance. The competitive adsorption of the four ions （Pb^2＋ , Cu^2＋ , Ni^2＋ , Hg^2＋ ） on manganese oxides was also investigated. The results showed that OMS exhibited better adsorption ability than OL and had excellent adsorption selectivity to Pb^2＋ , with 98% adsorption efficiency in two minutes. Therefore, this can be proposed as a simple, green and efficient method for treatment of polluted water.