Hydroxyl radical production by a heterogeneous Fenton reaction supported in insoluble tannin from bark of Pinus radiata
Hydroxyl radical production by a heterogeneous Fenton reaction supported in insoluble tannin from bark of Pinus radiata
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辐射松树皮不溶性单宁支持的非均相芬顿反应产生羟基自由基
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
W. Kaim
中科院分区：
文献类型：
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作者：
Romina Romero;D. Contreras;C. Segura;B. Schwederski;W. Kaim
由二羟基苯（DHB）驱动的芬顿反应已经用于通过高级氧化工艺（AOP）去除污染物，但是这样的系统具有DHB释放到水相中的缺点。在这项工作中，不溶性单宁从树皮可以用来驱动芬顿反应，并作为一个异质支持。这避免了DHB释放到水相中，并可用于AOP。采用自旋捕获电子顺磁共振技术（5-二甲基-1-吡咯啉-N-氧化物/·OH）在反应的第一分钟和高效液相色谱-荧光技术（香豆素/7-羟基香豆素）在反应的20分钟研究·OH的产生。使用辐射松树皮中的不溶性单宁实现的·OH产率高于使用儿茶素驱动芬顿反应所实现的。不溶性单宁驱动的类Fenton体系在30 min内对阿特拉津的降解率达到92.6 ± 0.3%.阿特拉津的降解动力学与·OH的产生量呈线性相关。该配体在·OH生成过程中反应活性的提高和不溶性为开发利用非均相芬顿体系降解废水中污染物的新技术提供了前景。
Fenton reactions driven by dihydroxybenzenes (DHBs) have been used for pollutant removal via advanced oxidation processes (AOPs), but such systems have the disadvantage of DHB release into the aqueous phase. In this work, insoluble tannins from bark can be used to drive Fenton reactions and as a heterogeneous support. This avoids the release of DHBs into the aqueous phase and can be used for AOPs. The production of ·OH was investigated using a spin-trapping electron paramagnetic resonance technique (5-dimethyl-1-pyrroline-N-oxide/·OH) in the first minute of the reaction and a high-performance liquid chromatography-fluorescence technique (coumarin/7-hydroxycoumarin) for 20 min. The ·OH yield achieved using insoluble tannins from Pinus radiata bark was higher than that achieved using catechin to drive the Fenton reaction. The Fenton-like system driven by insoluble tannins achieved 92.6 ± 0.3 % degradation of atrazine in 30 min. The degradation kinetics of atrazine was linearly correlated with ·OH production. The increased reactivity in ·OH production and insolubility of the ligand are promising for the development of a new technique for degradation of pollutants in wastewater using heterogeneous Fenton systems.
DOI：
10.1016/s0021-9258(18)77389-4
发表时间：
1990-08
期刊：
The Journal of biological chemistry
影响因子：
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作者：
I. Yamazaki;L. Piette
通讯作者：
I. Yamazaki;L. Piette