Abstract A hybrid film of chitosan/poly(vinyl alcohol)/cationic Fe(III)-porphyrin (Cht/PVA-FeTMPyP) was synthesized to act as a Fenton-like catalyst to decolorize methyl orange and methyl red azo dyes. The Cht/PVA-FeTMPyP film was characterized by different analytical and microscopy techniques, which indicated that the metalloporphyrin affects different properties of the hybrid film. Batch experiments revealed that the hybrid film exhibits enhanced catalytic activity towards dyes decolorization in the presence of H2O2 as compared to the “free” FeTMPyP. Fast decolorization rates as high as 90 min were observed for both azo dyes under mild conditions (pH 7 and room temperature), even at low concentrations of the catalyst in H2O2. After the decolorization, FTIR analysis showed that simple molecules are released as by-products. Moreover, the hybrid film performed well in cyclic runs without leaching out iron ions or losing its catalytic activity. All these features associated with its ease handling ranks the Cht/PVA-FeTMPyP hybrid film as a promising heterogeneous Fenton-like catalyst for the decomposition of azo dyes in water.

中文翻译：

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多糖/Fe(III)-卟啉杂化膜催化有毒偶氮染料氧化脱色：一种废水处理方法

摘要 合成了壳聚糖/聚乙烯醇/阳离子Fe(III)-卟啉(Cht/PVA-FeTMPyP)杂化膜作为类芬顿催化剂对甲基橙和甲基红偶氮染料脱色。Cht/PVA-FeTMPyP 薄膜通过不同的分析和显微镜技术进行表征，这表明金属卟啉影响混合薄膜的不同性质。批量实验表明，与“游离”FeTMPyP 相比，混合膜在 H2O2 存在下对染料脱色表现出增强的催化活性。在温和条件下（pH 7 和室温），即使在 H2O2 中催化剂浓度较低的情况下，两种偶氮染料的快速脱色速率均高达 90 分钟。脱色后，FTIR 分析显示简单分子作为副产物释放。而且，混合膜在循环运行中表现良好，不会浸出铁离子或失去其催化活性。所有这些与其易于处理相关的特征将 Cht/PVA-FeTMPyP 杂化膜列为有前途的非均相类芬顿催化剂，用于在水中分解偶氮染料。