Application of Soft X-rays in the Decomposition of Polycyclic Aromatic Hydrocarbons (PAHs) in Smoke Particles from Biomass Fuel Burning
Application of Soft X-rays in the Decomposition of Polycyclic Aromatic Hydrocarbons (PAHs) in Smoke Particles from Biomass Fuel Burning
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DOI：
10.4209/aaqr.2006.11.0025
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发表时间：
2007-03
影响因子：
4
通讯作者：
Yun-He Bai;M. Furuuchi;P. Tekasakul;S. Tekasakul;T. Choosong;Masaya Aizawa;M. Hata;Y. Otani
中科院分区：
文献类型：
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作者：
Yun-He Bai;M. Furuuchi;P. Tekasakul;S. Tekasakul;T. Choosong;Masaya Aizawa;M. Hata;Y. Otani
测试了波长为 1.3×10^(-4)-4.1×10^(-4) μm 的软 X 射线，用于研究多环芳烃（PAH）的分解，多环芳烃是生物质燃烧过程中排放的广泛的危险和致癌污染物。在软 X 射线照射后，使用两种不同的停留时间通过照射区域，在石英纤维过滤器上收集尺寸分级和未分级的烟雾颗粒，以确定软 X 射线照射对颗粒结合 PAH 浓度的影响。橡胶木燃烧产生的烟雾颗粒具有单一模态粒径分布，由小于 2 m 的细颗粒组成，颗粒中多环芳烃的质量分数比城市环境颗粒物高约 5 倍。橡胶木烟雾中的 PAH 通过软 X 射线照射分解最多约 30%，基本上与照射持续时间（0.022-0.067 秒）无关，并且稍微依赖于每种 PAH 组合物的沸腾温度。通过对粒度分级颗粒的辐照测试，发现更细粒度颗粒中的 PAH 被更有效地分解。软 X 射线有潜力用作污染控制的有效设备。
Soft X-rays with a wave length of 1.3×10^(-4)-4.1×10^(-4) μm were tested for use in studying the decomposition of polycyclic aromatic hydrocarbons (PAHs), widespread hazardous and carcinogenic pollutants that are emitted during biomass burning. Both size-fractionated and -unfractionated smoke particles, after irradiation by the soft X-rays, were collected on quartz-fiber filters using two different residence times through the irradiating zone to determine the effect of the soft X-ray irradiation on particle-bound PAH concentration. Smoke particles produced by rubberwood burning had a single modal size distribution consisting of fine particles less than 2 m and a large mass fraction of PAHs in particles that were about 5 times higher than the urban ambient particles. The PAHs in the rubberwood smoke were decomposed by soft X-ray irradiation up to about 30%, essentially independent of the duration of the irradiation (0.022-0.067 sec) and with a slight dependence on the boiling temperature of each PAH composition. From the irradiation test for the size fractionated particles, PAHs in finer fraction particles were found to be decomposed more effectively. Soft X-rays have the potential for use as an effective device for pollution control.