四(4-磺基苯基)卟啉自组装催化剂的制备及其可见光光催化性能研究

Preparation and Photocatalytic Activity of Self-assembled Four(4-methyl phenyl)Porphyrin

本文以四(4-磺基苯基)卟啉(TPPS)与硝酸锌(Zn(NO3)2·6H2O)为原料制备了卟啉自组装催化剂(Zn-TPPS-Zn),利用紫外可见光谱对其进行光化学表征.在可见光下(λ≥420nm)照射下,以光催化降解染料罗丹明B(Rhodamine B,RhB)为探针反应,探讨了Zn-TPPS-Zn光催化过程中活化O2对RhB的光催化降解活性.实验表明,RhB光催化降解的最佳条件为:pH 6.89、催化剂投加量0.33g/L.催化剂循环实验表明Zn-TPPS-Zn在可见光下对RhB的降解具有一定的稳定性,但还需进一步改善.通过跟踪测定Zn-TPPS-Zn/RhB/Vis光催化反应体系中氧化物种(H2O2和·OH)相对含量的变化,表明其光催化反应主要涉及羟基自由基(·OH)历程.

The TPPS and Zn（NO3）2·6H2O are used to assemble catalyst Zn-TPPS-Zn.The UV-visible spectrum and diffuse reflectance spectrum are used to verify the formation of Zn-TPPS-Zn.The photocatalytic degradation of organic dye Rhodamine B（RhB）is used as probe reactions to investigate the catalytic activity of Zn-TPPS-Zn;and the degradation conditions are optimized.During the degradation of RhB,H2O2 and OH are detected quantitatively,which indicates that the RhB is degraded via activating molecular oxygen（O2）by Zn-TPPS-Zn;and the generation procedure of the active species is speculated.