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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Redox cycling of copper mediated by hydrazine: efficient catalyst systems for oxidative degradation of rhodamine B
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Redox cycling of copper mediated by hydrazine: efficient catalyst systems for oxidative degradation of rhodamine B

机译：肼氧化铜的氧化还原循环：罗丹明B氧化降解的有效催化剂体系

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摘要

Catalytic processes based on Fenton-like reactions on the degradation of organic pollutants have been improved by accelerating the redox cycling of metal ions. This work presents, at first, the results obtained for the heterogeneous degradation of rhodamine B (RhB) by copper ferrite (CuFe2O4) in presence of hydrogen peroxide (H2O2) and hydrazine (N2H4) as redox cycle accelerator. Atomic absorption spectroscopy showed small amounts of Cu2+ are leached from ferrite highlighting the influence of the homogeneous catalysis in the whole process. The data obtained for the homogeneous process using Cu2+ in solution containing both N2H4 and H2O2 indicated such system is highly efficient mineralizing 73% of RhB within only 10 min of reaction and having H2O and CO2 as major products. Using tert-butyl alcohol as radical scavenger, it was confirmed hydroxyl radical (HO center dot) is the active oxidant species regarding the RhB degradation. The homogeneous catalyst was applied to a real sample of textile effluent spiked with RhB and showed reasonable efficiency, although lower than that obtained for the standard solutions of RhB. This result was assigned to the interference of salts in the medium that react with HO center dot thus acting as radical scavenger.
机译：通过加速金属离子的氧化还原循环，提高了基于FENTON样反应的催化过程。此工作首先呈现出在过氧化氢（H2O2）和肼（N2H4）存在下作为氧化还原循环促进剂的氟甲硅酸盐（CuFe 2 O 4）的罗丹明B（RHB）的异质降解的结果。原子吸收光谱显示出少量Cu2 +从铁氧体突出突出，突出了整个过程中均匀催化的影响。使用Cu 2 +在含有N2H4和H 2 O 2的溶液中获得的均匀方法的数据表明该系统在仅10分钟的反应中高效矿化73％的RHB，并具有H2O和CO 2作为主要产物。使用叔丁醇作为自由基清除剂，确认羟基自由基（Ho中心点）是关于RHB降解的活性氧化物种。将均相催化剂施加到用RHB尖刺的纺织品流出物的真实样品中，并且表现出合理的效率，尽管低于RHB的标准溶液所获得的效率。该结果被分配给培养基中的盐的干涉，其与HO中心点反应，从而充当自由基清除剂。

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