具有温敏性金属卟啉光敏剂对亚甲基兰的光降解的研究

Study on Photodegradation of Methylene Blue with Temperature Sensitive Metal Porphyrin Photosensitizer

卟啉是特殊大环共轭芳香体系,对光具有良好的灵敏性。以不对称羟基金属卟啉为原料,利用原子转移自由基聚合的方法,合成出具有温度响应性的金属卟啉聚合物,通过核磁谱图分析证实了目标产物的结构。并且以其作为光催化降解光敏剂,降解有机污染物亚甲基兰。考察了不同光降解反应条件下,卟啉聚合物在氧化剂H2O2存在下,可见光照射下降解率最佳。同时也考察了不同温度、相对分子质量、pH对光催化降解的影响。金属卟啉聚合物通过升温回收后,对亚甲基兰的降解几乎不发生变化。

The porphyrin with good sensitivity to light belongs to a special conjugated macrocyclic aromatic system.The active atom transfer radical polymerization（ATRP）method was used to prepare temperature response metal porphyrin polymers with asymmetric hydroxy metal porphyrin as raw material,and the polymers were characterized by 1H NMR.Methylene blue as anexample of organic pollutants was photodegradated by the polymer.The degradation rate of methylene blue using porphyrin polymers was the best in the presence of oxidizing agent H2O2 under visible light irradiation.The effects of temperature,molecular weight and pH on photocatalytic degradation was also studied.The degradation of methylene blue was almost unchanged after the recovery of metal porphyrin polymer at elevated temperature.