超声波降解溴系阻燃剂六溴环十二烷

对有毒有害、难降解物质六溴环十二烷(HBCD)进行了超声波降解的初步研究。在氩气气氛下,研究了3种主要同分异构体α-、β-和γ-HBCD的降解情况,同时测定了降解过程中溶液pH值和H2O2浓度的变化。结果表明:α-HBCD在超声波照射1h后被完全降解,β-和γ-HBCD在超声波照射6h后,降解率分别达到98.0%和60.0%;α-、β-和γ-HBCD的降解在最初0.5h内均服从假一级反应动力学规律,降解速率常数大小依次为α-HBCDβ-HBCDγ-HBCD;随着降解的进行,溶液pH值逐渐减小,H2O2浓度逐渐增大。同时初步提出了HBCD的降解机理。

Study on Ultrasonic Degradation of Brominated Flame Retardant Hexabromocyclododecane

The degradation of hexabromoeyclododecane（HBCD）,a harmful brominated flame retardant,was investigated using ultrasonic irradiation. The degradations of three major isomers α-,β and γ-HBCDs were studied in argon（At）. Meanwhile, the pH value and H2O2 concentration of solution were measured. The results showed that α-HBCD was completely degraded after 1 h of uhrasonic irradiation while the degradation rates of the β-and γ-HBCDs were 98.0% and 60. 0%, respectively, after 6 h of ultrasonic irradiation. In addition, the degradations of α-,β and γ-HBCDs in the first half hour were found to all follow pseudo first-order kinetics,and the degradation rate constants were in the order of α-HBCD〉β-HBCD〉 γ-HBCD. Moreover, the degradation mechanism was preliminarily proposed.