TiO_2对水溶液中4-氯酚电子束辐照降解和矿化的影响

DEGRADATION AND MINERALIZATION OF 4-CHLOROPHENOL IN AQUEOUS SOLUTIONS WITH ELECTRON BEAM IN THE PRESENCE OF TiO_2

以电子加速器为辐照手段,在4-氯酚水溶液中添加TiO2纳米粒子,通过对溶液辐照前后4氯-酚浓度、GC/MS、总有机碳(TOC)、氯离子浓度、辐照前后的紫外-可见光谱过程和溶液pH值的测定分析,研究4氯-酚水溶液在TiO2纳米粒子存在下的辐照降解和矿化特性.结果表明,TiO2纳米粒子的加入对4氯-酚的辐照降解效果没有明显影响,但改变了4-氯酚的降解途径并可以较大地提高4-氯酚的矿化.

4-Chlorophenol aqueous solutions containing TiO2 nanoparticles were irradiated with electron beams. Absorption spectra, total organic carbon （TOC） , Cl^- concentration , 4-chlorophenol concentration , GC/MS and pH value were investigated under different irradiation conditions. The effect of degradation under the various absorbed dose and TiO2 content was also discussed. 4-chlorophenol was decomposed by the electron beam irradiation in the absence of the TiO2 nanoparticles. The mineralization of 4-chlorophenol by electron beam irradiation was enhanced drastically by TiO2, and TOC value decreased from 95.5 to 10. 8mg ·L^ -1. The results of the experiments implied that the addition of TiO2 had no significant effect on 4-chlorophenol degradation, But the degradation pathway of 4-chlorophenol could be changed.