Mechanochemical Degradation of Hazardous Pentachloronitrobenzene to In-Suit N-Doped Alkynyl Carbon Material with High Supercapacitor Performance

Pentachloronitrobenzene (PCNB) as a typical banned POPs has received wide attention for its toxicity, migration and degradation, but its resource utilization has rarely been studied. In this work, hazardous PCNB was efficiently degraded and converted into N-doped alkynyl carbon material (NACM) through a solvent-free mechanochemical strategy. The reaction is mainly due to the substitution reaction of alkynyl groups from CaC 2 to organic chlorines in PCNB through mechanochemical activation. The solvent-free mechanochemical degradation for PCNB shows green manner with nonuse/nonrelease of hazardous materials, high efficiency with mild operating conditions (ball-milling 60 min under 400 rpm at CaC 2 :PCNB= 10), and superior feasibility with good technological economy. Meanwhile, the obtained NACM features unique alkynyl-linked benzene ring skeleton with multilayered nanoribbon morphology and in-situ N/O doping, and further exhibits excellent supercapacitive performance as an electrode material with high specific capacitance (292.9 F cm –3 ), good electrical conductivity (1718 S m –1 ), and outstanding cycling stability (>98.1% after 5000 cycles). This work provides multi-in-one strategy for the PCNB degradation and functional ACMs synthesis, and also may be a new prospective for the present issues in environmental or material sciences.