Covalent organic framework with N-O dual-active sites for high-selectivity palladium recovery in metallurgical wastewater.

Amidoxime-modified TpDB-AO with N–O dual-active sites captures Pd(II) from metallurgical wastewater with 240.3 mg g⁻¹ uptake, far exceeding pristine TpDB at 102.8 mg g⁻¹.

• Why it matters: Pd(II) recovery from complex metallurgical wastewater is needed to reduce metal pollution and enable precious-metal reuse, but COFs face limited selectivity and poor separability in practice.
• What they did: The authors post-synthetically functionalized TpDB-AO to create N–O synergistic chelating sites, then measured Pd(II) batch adsorption and tested a monolithic aerogel, TpDB-AO-AG, in dynamic breakthrough experiments.
• The result: TpDB-AO-AG treated real metallurgical wastewater with a cumulative volume of 1720.8 mL using 6 mg adsorbent at 23.3 mg L⁻¹ Pd(II), 35% higher than unmodified aerogel, with N–O chelation dominating selectivity.

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