Fe-Si-B非晶合金粉末对水溶液中Ni(II)的去除机理

Removal Mechanism of Ni(II) from Aqueous Solution by Fe-Si-B Metallic Glass Powder

摘要:

对比研究了商业Fe-Si-B非晶（Fe-Si-B^MG）粉末和目前广泛应用的零价铁粉（ZVI，Fe⁰）对水溶液中重金属离子Ni(II)的去除性能。动力学分析显示Fe-Si-B^MG粉末对Ni(II)的去除效率约为Fe⁰粉的38倍。通过对2种粉末的表面形貌观察发现，与Fe⁰粉相比， Fe-Si-B^MG粉末的表面产物层具有均匀、疏松的絮状物，更容易在搅拌过程中脱落。通过对Fe-Si-B^MG粉末反应前后的表面化学成分分析发现：Fe-Si-B^MG粉末通过吸附、还原、共沉淀作用去除水溶液中Ni(II)，而Fe⁰粉主要通过吸附和共沉淀去除水溶液中的Ni(II)。

Abstract:

The commercial Fe-Si-B metallic glass (Fe-Si-B^MG) powder and the widely used powder of zero valent iron (ZVI), namely Fe⁰, were used to eliminate the Ni(II) from aqueous solution. Kinetic analysis results indicate that the removal efficiency of Fe-Si-B^MG powder in removing Ni(II) is about 38 times faster than that of the Fe⁰ powder. Morphology observation shows that the product layers on the surface of Fe-Si-B^MG powder are composed of homogeneous and loose whiskers, which peel off more easily from the surface during the agitation process, compared with those of Fe⁰ powder. Chemical composition analysis about the surface of Fe-Si-B^MG powders before and after reaction shows that Fe-Si-B^MG powder can eliminate the Ni(II) through surface adsorption, reduction, and coprecipitation mechanisms; while Fe⁰ powder removes the Ni(II) in solution mainly through surface adsorption and coprecipitation mechanisms.