单宁酸与三价铁的相互作用，以协助2,4,6-三氯苯酚催化分解，并在Fenton基处理中再利用三价铁污泥作为铁催化剂的来源,Applied Catalysis B: Environment and Energy

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单宁酸与三价铁的相互作用，以协助2,4,6-三氯苯酚催化分解，并在Fenton基处理中再利用三价铁污泥作为铁催化剂的来源
Applied Catalysis B: Environment and Energy ( IF 20.2 ) Pub Date : 2016-01-22 09:25:44
Juri Bolobajev, Marina Trapido, Anna Goi

进行了全面的研究，在基于Fenton的氯酚类污染水处理过程中，在鞣酸存在下Fe ³⁺的催化行为。评估了含铁污泥催化基于Fenton的过程的能力，并评估了单宁酸在铁溶解中的力学行为。制浆造纸工业废水和天然水的成分单宁酸通过还原Fe ³⁺增强了Fe ³⁺活化的H ₂ O ₂氧化系统中的2,4,6-三氯苯酚催化分解。单宁酸与单宁酸–Fe ³⁺结合后的Fe ³⁺还原机理通过电子转移反应形成Fe ²⁺形成复合物并分解。通过脱氧核糖法间接测量羟基自由基（HO）表明，在单宁酸存在下，Fe ³⁺ / H ₂ O ₂对HO的影响显着增加。Fe ²⁺ / H ₂ O ₂降解2,4,6-三氯苯酚的拟一级反应速率常数很高，与鞣酸接近Fe ³⁺ / H ₂ O ₂。单宁酸和2,4,6-三氯苯酚的降解需要优化H ₂ O ₂和Fe ³⁺剂量以平衡HO的形成和清除。酸性反应介质（pH 3.0）和单宁酸的存在有利于由羟基氧化铁污泥中溶解的铁诱导的H ₂ O ₂氧化降解2,4,6-三氯苯酚。在基于Fenton的工艺中，将羟基氧化铁污泥再用作催化剂源可以最大程度地减少有害固体废物的产生和处理的总成本。这项研究突出了单宁酸-Fe ³⁺络合物参与Fe ³⁺还原途径的能力，并因此允许将未再生的羟基氧化铁污泥再利用以活化酸性废水中的H ₂ O ₂氧化。 pH值

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Interaction of tannic acid with ferric iron to assist 2,4,6-trichlorophenol catalytic decomposition and reuse of ferric sludge as a source of iron catalyst in Fenton-based treatment

A comprehensive study of the catalytic behaviour of Fe³⁺ in the presence of tannic acid during the Fenton-based treatment of chlorophenols-contaminated water was performed. The ability of the iron-containing sludge to catalyse the Fenton-based process was assessed and the mechanistic behaviour of tannic acid in the iron dissolution was evaluated. Tannic acid, a constituent of pulp and paper industry water effluent and natural water, enhanced the 2,4,6-trichlorophenol catalytic decomposition in Fe³⁺-activated H₂O₂ oxidation system by reducing of the Fe³⁺. The Fe³⁺ reductive mechanism by tannic acid incorporated tannic acid–Fe³⁺ complex formation and decay through an electron transfer reaction to form Fe²⁺. An indirect measurement of hydroxyl radical (HO) by the deoxyribose method indicated a considerable increase in HO by Fe³⁺/H₂O₂ in the presence of tannic acid. A pseudo-first reaction rate constant of 2,4,6-trichlorophenol degradation by Fe²⁺/H₂O₂ was high and close to that of Fe³⁺/H₂O₂ with tannic acid. Degradation of tannic acid along with that of 2,4,6-trichlorophenol required optimization of H₂O₂ and Fe³⁺ dosages to balance HO formation and scavenging. Acidic reaction media (pH 3.0) and the presence of tannic acid favoured 2,4,6-trichlorophenol degradation by H₂O₂ oxidation induced by iron dissolved from ferric oxyhydroxide sludge. The reuse of ferric oxyhydroxide sludge as a catalyst source in the Fenton–based process can minimise the production of hazardous solid waste and the overall cost of the treatment. This study highlights the ability of tannic acid-Fe³⁺ complexes to participate in Fe³⁺ reductive pathway and, as a result, to allow reuse of non-regenerated ferric oxyhydroxide sludge for activation of H₂O₂ oxidation in wastewater treatment at acidic pH.

更新日期：2016-01-23

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