Heterogeneous catalytic reactions of in-situ generated bromide ions via hydrodehalogenation of tetrabromobisphenol A in advanced oxidation processes over palladium nanoparticles

Herein, we report a novel and efficient approach for degrading tetrabromobisphenol A (TBBPA) via catalytic hydrodehalogenation (HDH) and advanced oxidation processes (AOP). Using heterogeneous catalytic HDH of TBBPA over palladium nanoparticles (Pd NPs) achieves the in-situ generation of bromide ions (Br-), which effectively accelerate and reinforce the degradation of debromination intermediates during peroxymonosulfate-based AOP. The conversion of TBBPA to bisphenol A (BPA) by the HDH process reaches up to 99.9% debromination efficiency in 1 h under near-neutral condition, along with the removal of 99.4% BPA in 15 min during the AOP. Further studies show that free bromine and 1O2 produced by in-situ generated Br- reacting with peroxymonosulfate are the most effective reactive species for promoting the BPA degradation. Sustainability footprint analysis reveals considerable stability and high sustainable footprint of the integrated process during long-term operation. This work provides a promising strategy to elimination of bromine organic pollutants in water treatment. [Display omitted] •HDH over Pd NPs achieves completely TBBPA debromination with 99.9% H2 utilization.•In-situ generated Br-via HDH over Pd NPs contribute to the BPA removal in AOP.•HOBr/OBr- and 1O2 from Br- reacting with PMS is the most effective reactive specie.•1O2 formation via the reaction between PMS and Br- is thermodynamically favorable.•Integrated HDH-AOP over Pd NPs exhibits the considerable sustainable footprint.