Abstract:

Selecting 17α-ethynylestradiol (EE2) as the target pollutant and TiHAP as the catalyst, comparative studies of the photocatalytic degradation of TiHAP and TiO₂ were conducted, and the influencing factors and intermediate products were also investigated. The results show that the EE2 degradation rate by TiHAP film was faster than that by TiO₂ film. The EE2 degradation rate of TiHAP remained the same with the increase of Fe³⁺ concentration, but decreased with the increase of FA concentration. For TiO₂, the EE2 degradation rate initially increased and then decreased with increasing Fe³⁺ concentration, and increased with increasing FA concentration. The photocatalitic degradation intermediates of EE2 by TiHAP were identified by LC-MSⁿ. The results show that nine kinds of intermediates were identified. Compared with TiO₂, more kinds of intermediates were identified for EE2 photocatalytic degradation by TiHAP. Transformation of the phenolic moiety, hydroxylation, ring opening and carboxylation, and carboxylation were the primary reaction pathways.

Key words: TiHAP, EE2, photocatalysis

摘要：

以 17α-乙炔雌二醇(EE2)为目标污染物, 以载钛羟基磷灰石(TiHAP)为催化剂, 对比研究TiHAP和TiO₂对EE2的光催化规律、影响因素及机理, 分析光催化降解的中间产物及降解途径。实验结果表明, TiHAP薄膜对EE2的降解速率高于TiO₂薄膜; 随着Fe³⁺浓度增加, TiHAP降解EE2的速率没有明显变化, TiO₂降解EE2的速率则先增加后减小; 随着富里酸(FA) 浓度的增加, TiHAP降解EE2的速率减小, 而TiO₂降解EE2的速率升高。用LC-MSⁿ对TiHAP光催化降解EE2过程中产生的中间产物进行分析, 在中性pH条件下共确定9种降解产物, 比同样pH值下以TiO₂为催化剂检出的产物种类多, 推断其降解的主要途径是苯环羟基化、开环羧基化以及脱羧等一系列反应。

关键词: 载钛羟基磷灰石, 17α-乙炔雌二醇, 光催化降解