Study on the reuse of nanoscale zero-valent iron (nZVI) in a Sono–Photo–Fenton-like process for the treatment of TNT-contaminated wastewater
DOI:
https://doi.org/10.54939/1859-1043.j.mst.IMBE.2025.129-135Keywords:
Sono-Photo-Fenton-like process; nZVI; TNT; Iron recovery; Catalyst reuse.Abstract
This study evaluates the effectiveness of recovering and reusing nano zero-valent iron (nZVI) in the treatment of TNT-containing wastewater using the Sono-Photo-Fenton-like (SPF-like) process. Experiments were conducted under fixed optimal conditions: pH = 2.5; H₂O₂ = 40 mM; and initial TNT concentration = 50 mg/L. Results showed that recovered nZVI material maintained good catalytic activity, with TNT removal efficiency reaching over 24% after 4 consecutive reuse cycles. When dry-recovered iron material was combined with fresh nZVI at a 1:1 ratio (1.0 mM nZVI and 1.0 mM Fe(OH)₃), treatment efficiency reached 94.85%, while still reducing the amount of new material used by 50%. These results demonstrate the practical applicability of recovering and reusing iron in advanced oxidation systems, helping to maintain high treatment efficiency, while reducing operational costs and waste generation in the treatment of industrial wastewater containing persistent pollutants like TNT.
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