A feasible approach for azo dye degradation using natural magnetite in heterogeneous Fenton oxidation

Q1 Environmental Science

Water Cycle Pub Date : 2022-01-01 DOI:10.1016/j.watcyc.2022.06.002

Wen-Min Wang , Xinzheng Li , Xin Du , Qian-Yuan Wu

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引用次数: 5

Abstract

Azo dyes, which are widely used in the textile industry, are typical toxic and refractory pollutants in wastewater. Heterogeneous Fenton oxidation is effective in degrading organic compounds; however, it may induce Fe-leaching. Therefore, it is necessary to find efficient, cheap, and natural iron mineral catalysts for heterogeneous Fenton oxidation. This work aimed to investigate the removal of the representative azo dye reactive yellow 3 (RY3) by iron mineral/H₂O₂ oxidation. Compared with hematite and pyrite, magnetite showed superior RY3 degradation efficiency via heterogeneous Fenton oxidation. The optimum parameters for degradation of 50 mg/L RY3 by magnetite/H₂O₂ were 0.2 g/L magnetite, 0.5 mM H₂O₂, and pH 3.5. Under the optimum parameters, RY3 was almost completely degraded within 40 min. Through free radical trapping experiments, hydroxyl radicals (•OH) were identified as the dominant reactive radical species for RY3 degradation by magnetite/H₂O₂ oxidation.

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利用天然磁铁矿进行非均相Fenton氧化降解偶氮染料的可行方法

偶氮染料广泛应用于纺织工业，是废水中典型的有毒难降解污染物。非均相Fenton氧化法对有机物的降解效果较好;然而，它可能诱发铁浸出。因此，寻找高效、廉价、天然的铁矿物催化非均相Fenton氧化是十分必要的。研究了铁矿物/H2O2氧化法对偶氮染料活性黄3 (RY3)的去除效果。与赤铁矿和黄铁矿相比，磁铁矿通过非均相Fenton氧化对RY3的降解效果更好。磁铁矿/H2O2降解50 mg/L RY3的最佳工艺参数为:磁铁矿0.2 g/L、H2O2 0.5 mM、pH 3.5。在最佳工艺条件下，RY3在40 min内几乎完全降解。通过自由基捕获实验，确定了羟基自由基(•OH)是磁铁矿/H2O2氧化降解RY3的主要活性自由基。

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