The study primarily focuses on demonstrating the feasibility of the electrocatalytic nitrate reduction to ammonia on Fe SAC under ideal laboratory conditions. Real-world wastewater systems present far more complex compositions, including various organic and inorganic contaminants, which may significantly influence the catalyst's performance. The study lacks investigation into the impact of these complex matrices.

While the reported FE of ~75% is promising, it still implies that 25% of the nitrate is converted into other byproducts. The environmental impact of these byproducts isn't fully addressed. A complete nitrogen balance is necessary to assess the overall sustainability of the process.

The economic feasibility of the process isn't addressed. Factors like electricity costs, catalyst production costs, and ammonia separation/purification costs are crucial for determining the viability of the process as a nitrate remediation and ammonia production method. Comparison to existing ammonia production methods is missing.

The long-term stability of the Fe SAC under real wastewater conditions requires further investigation. While initial stability tests show promising results, the presence of competing ions, fouling agents, and changing pH in real wastewater may lead to catalyst degradation over time. A more thorough long-term stability analysis is essential.