Photocatalytic degradation of polycyclic aromatic hydrocarbons in GaN:ZnO solid solution-assisted process: Direct hole oxidation mechanism
作者:Jiahui Kou、Zhaosheng Li、Yong Guo、Jun Gao、Ming Yang、Zhigang Zou
DOI:10.1016/j.molcata.2010.03.029
日期:2010.6.15
evaluated. The experimental results show that GaN:ZnO exhibits excellent activity for the photodegradation of PAHs, and the activity can be obviously improved by loading Pt. The reactivity of PAHs decreases in the order of PHE > BaA > ANT > ACE. On the catalyst of Pt–GaN:ZnO, PHE, BaA, ANT, and ACE can be degraded completely after 1, 3, 6, and 8 h visible light irradiation respectively. The mechanism examination
研究了四种多环芳烃(PAH),即菲(PHE),蒽(ANT),(ACE)和苯并[a]蒽(BaA)的光氧化作用。在Pt改性之前和之后的固溶GaN:ZnO被用作光催化剂。通过气相色谱-质谱仪分析了光降解的中间体。通过电子顺磁共振自旋捕集技术和过氧化氢试纸条监测当前光催化系统中的活性物质。还评估了自由基和空穴清除剂对PAHs光催化降解的影响。实验结果表明,GaN:ZnO对PAHs的光降解表现出优异的活性,而负载Pt可以明显提高其活性。PAHs的反应性按PHE>的顺序降低 BaA>蚂蚁> ACE。在Pt-GaN:ZnO的催化剂上,分别在可见光照射1、3、6和8 h后,PHE,BaA,ANT和ACE可以完全降解。机理研究证明,在本光催化体系中,PAHs的降解是由空穴和活性氢物种的形成引起的。孔与多环芳烃相互作用产生多环芳烃+,其活性足以与O 2和活性H物种发生反应。理论计算结果表明,没有sp 3轨道杂