Adsorption and High-Temperature Nitrogen Desorption Performance and Mechanism of Granular Activated Carbon for Large-Air-Volume Low-Concentration PCE-Containing Waste Gas

• • PCE static adsorption capacity on GAC reached 556.6 mg·g−1, while multi-component dynamic adsorption capacity was 179.6 mg·g−1, demonstrating high efficacy for low-concentration Cl-VOCs. • • During 500 °C nitrogen desorption, HCl yield was 3.61% of the chlorine molar content in adsorbed PCE, indicating partial dechlorination and necessitating corrosion control above 200 °C. • • After 4 adsorption-desorption cycles, GAC iodine value fell below 600 mg·g−1; water washing and alkali immersion extended cycle life to 8 and 9 cycles, respectively, enhancing industrial viability. • • The proposed classification strategy (RTO for high-concentration, adsorption-nitrogen desorption for low-concentration) reduced annual costs by 49.5×10⁴ CNY compared to conventional adsorption+RTO, offering economic advantage.