Harrad Stuart, Robson Matthew, Hazrati Sadegh, Baxter-Plant Victoria S, Deplanche Kevin, Redwood Mark D, Macaskie Lynne E
School of Geography, Earth and Environmental Sciences and School of Biosciences, The University of Birmingham, Edgbaston, Birmingham, UKB15 2TT.
J Environ Monit. 2007 Apr;9(4):314-8. doi: 10.1039/b616567b. Epub 2007 Feb 21.
The environmentally prevalent polybrominated diphenyl ether (PBDE) #47 and polychlorinated biphenyls (PCBs) #28 and #118 were challenged for 24 hours with a novel biomass-supported Pd catalyst (Bio-Pd(0)). Analysis of the products via GC-MS revealed the Bio-Pd(0) to cause the challenged compounds to undergo stepwise dehalogenation with preferential loss of the least sterically hindered halogen atom. A mass balance for PCB #28 showed that it is degraded to three dichlorobiphenyls (33.9%), two monochlorobiphenyls (12%), and biphenyl (30.7%). The remaining mass was starting material. In contrast, while PCB #118 underwent degradation to yield five tetra- and five trichlorinated biphenyls, no less chlorinated products or biphenyl were detected, and the total mass of degraded products was 0.3%. Although the Bio-Pd(0) material was developed for treatment of PCBs, a mass balance for PBDE #47 showed that the biocatalyst could prove a potentially useful method for treatment of PBDEs. Specifically, 10% of PBDE #47 was converted to identifiable lower brominated congeners, predominantly the tribrominated PBDE #17 and the dibrominated PBDE #4, 75% remained intact, while 15% of the starting mass was unaccounted for.
环境中普遍存在的多溴二苯醚（PBDE）#47以及多氯联苯（PCBs）#28和#118，用一种新型生物质负载钯催化剂（Bio-Pd(0)）进行了24小时的处理。通过气相色谱-质谱联用仪（GC-MS）对产物进行分析，结果显示Bio-Pd(0)能使受试化合物发生逐步脱卤反应，优先失去空间位阻最小的卤原子。对PCB #28的质量平衡分析表明，它降解为三种二氯联苯（33.9%）、两种一氯联苯（12%）和联苯（30.7%）。其余质量为起始原料。相比之下，虽然PCB #118发生了降解，生成了五种四氯和五种三氯联苯，但未检测到氯含量更低的产物或联苯，降解产物的总质量为0.3%。尽管Bio-Pd(0)材料是为处理多氯联苯而开发的，但对PBDE #47的质量平衡分析表明，这种生物催化剂可能是一种处理多溴二苯醚的潜在有用方法。具体而言，10%的PBDE #47转化为可识别的低溴化同系物，主要是三溴化PBDE #17和二溴化PBDE #4，75%保持完整，而起始质量的15%去向不明。
