利用自制的TiO₂/锂硅粉催化剂与H₂O₂联用进行光催化降解邻苯二甲酸二甲酯（DMP）废水研究。实验结果表明，TiO₂/锂硅粉与H₂O₂联用是降解DMP的有效方法，当TiO₂/锂硅粉投加量为1.2 g/L、H₂O₂体积分数为2.0 mL/L、初始pH=8.0时，反应10 h的DMP降解率最大，为89.18%。通过LC/MS分析反应过程中DMP的降解产物，主要包括侧链缩合成环生成的水杨酸、羟基化产物邻苯二酚和苯环开环生成的2-羟基异丁酸。初步推测TiO₂/锂硅粉-H₂O₂体系下DMP的碳链断裂从侧链开始。

Photocatalytic degradation of dimethyl phthalate (DMP) wastewater is performed through combining use of self-made TiO₂/lithium silicon powder catalyst and H₂O₂.Experimental results show that the TiO₂/lithium silicon powder-H₂O₂ technology is an effective method for degrading DMP.The degradation rate of DMP reaches the biggest,89.18% when the dosage of TiO₂/lithium silicon powder is 1.2 g·L^-1,the dosage of H₂O₂ is 2.0 ml·L^-1,the initial pH=8.0 and reaction lasts for 10 h.It is found by LC/MS analysis that the degradation products of DMP during the reaction mainly include salicylic acid that is formed through side chain condensing into ring,catechol that is a hydroxylated product and 2-hydroxyisobutyric acid that is formed by ring opening of benzene.It is presumed that the carbon chain cleavage of DMP starts from the side chain under TiO₂/Lithium silicon powder-H₂O₂ system.

冉孟家(1992-),男,硕士研究生,研究方向为污染控制理论与技术,534971697@qq.com