Highly selective enrichment of Au using enaminone covalent organic polymers (COP)

The second recovery of gold has fundamental environmental and economic significance. In this study, an enaminone covalent organic polymer (COP) was synthesized and used to recover gold from secondary resources. The ketene covalent organic polymer (COP) possessed good gold adsorption performance, and the best adsorption capacity could reach up to 1945 mg g(-1) at 298 K, which was superior to traditional adsorbents. Meanwhile, the synthesized COP exhibited excellent adsorption selectivity and renewability of Au3+. The pseudo-second-order kinetic equation and Langmuir equation were suggested for describing the adsorption process. Moreover, this gold adsorption behavior was intended to be a spontaneous, endothermic, and entropy increasing process.

Automated summary

The synthesized ketene covalent organic polymer shows excellent performance in recovering gold from secondary resources, with high adsorption capacity and selectivity. The adsorption process follows pseudo-second-order kinetics and is described by the Langmuir equation, indicating it is a spontaneous, endothermic, and entropy-increasing process. The COP is a promising material for environmentally friendly gold recovery in the future.