Fe3O4 Nanoparticles from FeSiAl Alloy of Spent Printed Circuit Boards and its Application in Dye Degradation
الموضوعات : Iranian Journal of Catalysis
Dinesh Patil
1
,
M. Sridhara
2
,
J. Manjanna
3
,
Sandip Sabale
4
1 - Department of Chemistry, Rani Channamm a University, Belagavi 591 156, Karnataka, India
2 - Department of Chemistry, Rani Channamm a University, Belagavi 591 156, Karnataka, India
3 - Department of Chemistry, Rani Channamm a University, Belagavi 591 156, Karnataka, India
4 - P.G. Department of Chemistry, Jaysingpur College, Jaysingpur, 416 101, Maharashtra, India
الکلمات المفتاحية: Fe3O4, Citric acid and ascorbic acid, Spent PCBs, Soft magnetic FeSiAl cores,
ملخص المقالة :
Fe is an important element, used in soft magnetic materials (cores) in electrical and electronic devices and its concentration in e-waste is high. Thus, this study is aimed to recover Fe from the soft magnetic FeSiAl cores of spent printed circuit boards (PCBs). Here, the Fe-rich FeSiAl cores were identified, separated manually, and subjected to dissolution in citric acid (100 mM) and ascorbic acid (10 mM) mixture at 80 °C. The dissolved Fe was selectively precipitated as Fe3O4 using 20% NaOH in an N2 atmosphere at 90 °C for about 60 min. The obtained Fe3O4 shows ferromagnetic behavior with 30 emu/g saturation magnetization at 300 K. The BET surface area of Fe3O4 NPs was found to be 71.656 m2 g-1. Furthermore, the Fe3O4 NPs were utilized for methylene blue degradation with H2O2 in visible light irradiation. At optimum conditions, such as 10 ppm MB solution, 0.1 mL H2O2, and an S:L ratio of 0.05 g/L about 100% degradation was achieved in about 45 min under visible light irradiation and the correlated rate constant is 0.084 min-1. We believe that the synthesis of value-added compounds directly from the dissolution medium is an environmentally benign step toward resource recycling.
