Research on the Mechanism of Efficient and Sustainable Degradation of Phenolic Wastewater by 3D-printed FeNi Porous Framework

The heterogeneous Fenton-like technology has gained attention for its potential in treating refractory organic wastewater. However, traditional nano-catalysts face challenges such as agglomeration, recovery difficulties, and active site deactivation, limiting their practical use. This study proposes a synergistic material-structure design strategy by fabricating a three-dimensional porous FeNi alloy monolithic catalyst via selective laser melting (SLM). Characterization results show that the SLM process yields a dense and uniform solid solution alloy. This structured catalyst exhibits exceptional catalytic activity in the Fenton-like degradation of phenol. Experimental results indicate that at a phenol concentration of 50 mg/L, catalyst dosage of 4 g/L, H 2 O 2 concentration of 5 mmol/L, pH value of 3, and temperature of 50°C, up to 99% of phenol was degraded within 9 minutes. The kinetic reaction constant is measured at 0.31 min⁻¹, with the catalyst being reusable for over 33 cycles. This approach shows great potential in treating phenolic wastewater.