title: Mechanochemical degradation of tetrabromobisphenol A: performance, products and pathway.
abstract: Tetrabromobisphenol A (TBBPA) is the most widely used brominated flame retardant (BFR), which has received more and more concerns due to its high lipophilicity, persistency and endocrine disrupting property in the environment. Considering the possible need for the safe disposal of TBBPA containing wastes in the future, the potential of mechanochemical (MC) destruction as a promising non-combustion technology was investigated in this study. TBBPA was co-ground with calcium oxide (CaO) or the mixture of iron powder and quartz sand (Fe+SiO(2)) in a planetary ball mill at room temperature. The method of Fe+SiO(2) destructed over 98% of initial TBBPA after 3h and acquired 95% debromination rate after 5h, which showed a better performance than the CaO method. Raman spectra and Fourier transform infrared spectroscopy (FTIR) demonstrated the generation of inorganic carbon with the disappearance of benzene ring and CBr bond, indicating the carbonization and debromination process during mechanochemical reaction. LC-MS-MS screening showed that the intermediates of the treatment with Fe+SiO(2) were tri-, bi-, mono-brominated BPA, BPA and other fragments. Finally all the intermediates were also destroyed after 5h grinding. The bromine balance was calculated and a possible reaction pathway was proposed.
authors.affiliation: State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC), School of Environment, POPs Research Center, Tsinghua University, Beijing 100084, PR China.
authors.forename: Kunlun
authors.initials: K
authors.lastname: Zhang
authors.forename: Jun
authors.initials: J
authors.lastname: Huang
authors.forename: Wang
authors.initials: W
authors.lastname: Zhang
authors.forename: Yunfei
authors.initials: Y
authors.lastname: Yu
authors.forename: Shubo
authors.initials: S
authors.lastname: Deng
authors.forename: Gang
authors.initials: G
authors.lastname: Yu
mesh_terms: D001554:Benzene / Q000737:chemistry; D017610:Calcium Compounds / Q000737:chemistry; D002244:Carbon / Q000032:analysis; D002851:Chromatography, High Pressure Liquid; D005374:Filtration; D005411:Flame Retardants / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D007501:Iron / Q000737:chemistry; D013058:Mass Spectrometry; D055595:Mechanical Phenomena; D010087:Oxides / Q000737:chemistry; D011075:Polybrominated Biphenyls / Q000737:chemistry*; D011791:Quartz; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D017610:Calcium Compounds; D005411:Flame Retardants; D010087:Oxides; D011075:Polybrominated Biphenyls; D014874:Water Pollutants, Chemical; D011791:Quartz; D002244:Carbon; C016538:lime; D007501:Iron; C020806:tetrabromobisphenol A; D001554:Benzene