A novel treatment of waste printed circuit boards by low-temperature near-critical aqueous ammonia: Debromination and preparation of nitrogen-containing fine chemicals.

•We report a novel low temperature NCAA process for treatment of waste PCBs.•Debromination and resource recovery were achieved simultaneously.•Debromination efficiency reached 100% at 300 °C.•Copper foil was efficiently recovered from waste PCBs by the NCAA process.•Pyrazine and pyridine compounds were obtained for the first time from waste PCBs.