Sun Yifei, Takaoka Masaki, Takeda Nobuo, Matsumoto Tadao, Oshita Kazuyuki
Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyoto University, Yoshida-honmachi, Kyoto 606-8501, Japan.
Chemosphere. 2006 Oct;65(2):183-9. doi: 10.1016/j.chemosphere.2006.03.009. Epub 2006 Apr 21.
The process of destroying polychlorinated biphenyls (PCBs) generates exhaust gases that contain low quantities of PCBs, which cannot be disposed of easily. Activated carbon (AC) can be used to adsorb residual PCBs after disposal of high-level PCBs. We examined the chemical reactivity of AC-supported iron as a catalyst to decompose PCB-153, and varied three decomposition parameters (temperature, time and iron concentration) under an atmosphere of either air or N(2). We measured the Brunauer-Emmett-Teller (BET) surface area and pore volume of AC to assess the adsorption capacity of AC before and after decomposition. At low temperatures the adsorption process was more important than the decomposition process. The decomposition process was completed within 30 and 60 min under air and N(2), respectively. The efficiency of PCB-153 decomposition at 350 degrees C for 120 min was approximately 100.0% and 97.1% under air and N(2), respectively. Analysis of inorganic chloride ions revealed that PCB-153 was effectively destroyed during decomposition. The differences between decomposition under air and N(2) reflected differences in BET surface and pore volume.
多氯联苯（PCBs）的销毁过程会产生含有少量PCBs的废气，这些废气不易处理。在处理高浓度PCBs后，可使用活性炭（AC）吸附残留的PCBs。我们研究了负载铁的活性炭作为催化剂分解多氯联苯153（PCB - 153）的化学反应活性，并在空气或氮气气氛下改变了三个分解参数（温度、时间和铁浓度）。我们测量了活性炭的比表面积（BET）和孔体积，以评估分解前后活性炭的吸附能力。在低温下，吸附过程比分解过程更重要。在空气和氮气气氛下，分解过程分别在30分钟和60分钟内完成。在350℃下120分钟，PCB - 153在空气和氮气气氛下的分解效率分别约为100.0%和97.1%。无机氯离子分析表明，PCB - 153在分解过程中被有效破坏。空气和氮气气氛下分解的差异反映了比表面积和孔体积的差异。
