Excellent capability in remediating Cu~(2+) from aqueous solution by Fe-Si-B amorphous alloys

摘要

Fe-Si-B amorphous alloy ribbons (Fe-Si-B~(AR)) are widely investigated recently due to its high efficiency in remediation of wastewater containing azo dyes and other organic pollutants. In this paper, the effects of Fe-Si-B~(AR) on the remediation of water containing high levels of Cu~(2+) ions were discussed. Results show that the reaction mechanism of Fe-Si-B~(AR) with Cu~(2+) ions solution is the same as iron powders (Fe~(CP)). But the reaction efficiency of Fe-Si-B~(AR) is about 167 and 34 times than that of Fe~(CP) for the Cu~(2+) ions solution of 100 mg/L and 500 mg/L, respectively. Furthermore, the apparent reaction activation energy is calculated to be 18.7 and 19.4 kJ/mol for Fe-Si-B~(AR) and Fe~(CP), indicating that both the reactions of Fe-Si-B~(AR) and Fe~(CP) are diffusion-controlled process. Microstructure investigations shown that loose product layer on the surface of the Fe-Si-B~(AR) contribute to the high efficiency of Fe-Si-B~(AR) in remediation of heavy metal-polluted water.