Disappearance of polycyclic aromatic hydrocarbons sorbed on surfaces of pine [Pinua thunbergii] needles under irradiation of sunlight: Volatilization and photolysis
Disappearance of polycyclic aromatic hydrocarbons sorbed on surfaces of pine [Pinua thunbergii] needles under irradiation of sunlight: Volatilization and photolysis
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DOI：
10.1016/j.atmosenv.2005.04.008
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发表时间：
2005-08
影响因子：
5
通讯作者：
Degao Wang;Jingwen Chen;Zhen-Jie Xu;X. Qiao;Liping Huang
中科院分区：
文献类型：
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作者：
Degao Wang;Jingwen Chen;Zhen-Jie Xu;X. Qiao;Liping Huang
研究了吸附在松针表面的16种多环芳烃（PAHs）在太阳光下的降解过程。多环芳烃是由聚苯乙烯燃烧产生的，暴露在松针表面。松针表面吸附的多环芳烃的消失主要是由挥发和光解引起的，其中光解起主要作用。挥发速率与多环芳烃分子量显著相关。16种多环芳烃的光解反应遵循一级动力学，其光解半衰期（t1/2，P）从萘的12.9h到芴的65.4h不等。多环芳烃无论吸附在云杉针还是松针上都有相似的半衰期。与水相比，松针表皮蜡能稳定多环芳烃的光解作用，促进多环芳烃的积累。t1/2，所选多环芳烃的p与半经验计算的最高已占据轨道（EHOMO）能量相关。多环芳烃的光化学行为不仅与它们的分子结构有关，还与它们所吸附的底物的理化性质有关。
The solar photodegradation of 16 polycyclic aromatic hydrocarbons (PAHs), sorbed on surfaces of pine [Pinua thunbergii] needles was investigated. The PAHs were produced by combustion of polystyrene and exposed onto the surfaces of pine needles. The disappearance of PAHs sorbed on the pine needle surfaces is mainly caused by volatilization and photolysis, with photolysis playing a major role. The volatilization rates correlate with PAH molecular weight significantly. The photolysis of the 16 PAHs follows first-order kinetics and their photolysis half-lives (t1/2,P) range from 12.9h for naphthalene to 65.4h for fluorene. The PAHs have similar half-lives whether they are sorbed on spruce or pine needles. Compared with water, the cuticular waxes of pine needles can stabilize photolysis of PAHs and facilitate accumulation of PAHs. t1/2,Pfor selected PAHs correlate with semi-empirically calculated energy of the highest occupied orbital (EHOMO). Photochemical behaviors of PAHs are dependent not only on their molecular structures but also the physical–chemical properties of the substrate on which they are adsorbed.