3D printing technology enables the precise and scalable fabrication of porous, high-surface-area structures tailored for ion exchange and adsorption, making it a cost-effective tool for environmental applications. On the other hand, ammonium contamination in wastewater, originating from various sources including agricultural and livestock activities, poses significant environmental challenges while also representing a valuable resource for recovery. Effective ammonium removal is essential for mitigating its impact on aquatic ecosystems, where it disrupts ecological balance and promotes toxic algal blooms.

This study explores the potential of copper hexacyanoferrate (CuHCF), a widely recognized adsorbent among Prussian Blue Analogs (PBAs), for efficient ammonium adsorption due to its remarkable capacity and selectivity. To enhance its performance, 3D-printed scaffolds (Fused Deposition Modeling, Selective Laser Sintering) were investigated as effective support materials for CuPBA powders, offering tunable porosity, increased surface area, and the ability to immobilize greater amounts of adsorbent depending on the scaffold's shape and structure.