Preparation of zero-valent iron by carbothermal reduction of Nd-Fe-B waste iron slag and its degradation of azo dye wastewater
Zero-valent iron(ZVI)materials were prepared from Nd-Fe-B waste iron slag by carbothermal reduction method and used to degrade azo dye wastewater.The effects of preparation conditions on the properties of ZVI and degradation conditions on the removal of azo dye molecules by ZVI were investigated.The results showed that the ZVI material prepared at a roasting temperature of 1 000℃,a roasting time of 60 min,and an anthracite dosage of 30% (mass fraction)had better degradation performance for methyl orange(MO).The ZVI materials were characterized and analyzed using an X-ray diffractometer(XRD),scanning electron microscope(SEM),and energy spectrometer(EDS).The results showed that the iron minerals in the iron slag of Nd-Fe-B waste were basically reduced to ZVI,which was loaded on aluminosilicates,and the size of the ZVI particles was 5-15 μm.The prepared ZVI materials showed high degradation efficiency for acid orange G(OG)in the pH range of 3-10,with a maximum removal capacity of 54.23 mg/g,and the degradation efficiency for MO,methylene blue(MB),and acid chromium blue K(ACBK)all had degradation efficiencies of more than 78% .The preparation of ZVI by carbothermal reduction not only provides a new way to recycle and reuse Nd-Fe-B waste iron slag but also contributes a low-cost degradation material to environmental remediation.
Nd-Fe-B waste iron slagzero-valent ironazo dyeacid orange Gcarbothermal reduction method
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维普
