共查询到19条相似文献,搜索用时 62 毫秒
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采用微弧氧化法在硅酸盐电解液体系中于钛合金表面成功制备了铁氧化物膜层类Fenton催化剂。采用SEM、XRD以及XPS对所得膜层的表面形貌、晶体结构及物相组成进行表征,发现膜层中含有金红石相TiO2(R-TiO2),和非晶态的铁氧化物Fe3O4;对膜层的表面形貌分析发现电解液中加入铁氰化钾后表面粗糙度及平均孔尺寸增大。以苯酚作为目标降解物,研究了膜层类Fenton催化活性,同时研究了铁源含量、苯酚浓度、H2O2投料量以及pH值对膜层降解苯酚效率的影响,优化了降解条件,研究发现在pH 3.0、温度30℃、H2O2 6.0 mmol·L-1、苯酚35 mg·L-1及铁氰化钾含量10 g·L-1的条件下降解90 min,苯酚降解效率可达90%。通过对不同温度下降解苯酚的反应动力学研究,利用阿伦尼乌斯方程得到了该膜层类Fenton降解苯酚的反应活化能Ea为96.9 kJ·mol-1。最后,评价了膜层的稳定性并分析了稳定性衰减的原因。 相似文献
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采用微弧氧化法在硅酸盐电解液体系中于钛合金表面成功制备了铁氧化物膜层类Fenton催化剂。采用SEM、XRD以及XPS对所得膜层的表面形貌、晶体结构及物相组成进行表征,发现膜层中含有金红石相TiO_2(R-TiO_2),和非晶态的铁氧化物Fe_3O_4;对膜层的表面形貌分析发现电解液中加入铁氰化钾后表面粗糙度及平均孔尺寸增大。以苯酚作为目标降解物,研究了膜层类Fenton催化活性,同时研究了铁源含量、苯酚浓度、H_2O_2投料量以及pH值对膜层降解苯酚效率的影响,优化了降解条件,研究发现在pH 3.0、温度30℃、H_2O_26.0 mmol·L~(-1)、苯酚35 mg·L~(-1)及铁氰化钾含量10 g·L~(-1)的条件下降解90 min,苯酚降解效率可达90%。通过对不同温度下降解苯酚的反应动力学研究,利用阿伦尼乌斯方程得到了该膜层类Fenton降解苯酚的反应活化能Ea为96.9 kJ·mol~(-1)。最后,评价了膜层的稳定性并分析了稳定性衰减的原因。 相似文献
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Sandra Rachmilovich‐Calis Alexandra Masarwa Dr. Naomi Meyerstein Prof. Dan Meyerstein Prof. Rudi van Eldik Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(33):8303-8309
The kinetics of the Fenton reaction was studied in detail. A second reaction step in the presence of excess H2O2 is attributed to formation of the complex FeIII(?O2H)aq. Therefore, the reaction of Fe(H2O)62+ with FeIII(?O2H)aq in the presence of FeII to form FeIIIaq (k=(7.7±1.5)×105 M ?1 s?1) may contribute to the overall Fenton reaction, and could account for some of the debate in the literature concerning its detailed mechanism. If this is correct for LFeIII(?O2H)aq also, then it might be of significant biological importance. The activation parameters ΔH≠, ΔS≠, and ΔV≠ for the Fenton reaction were measured under various experimental conditions, and are used in the mechanistic interpretation. 相似文献
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《Analytical letters》2012,45(14):3051-3065
ABSTRACT This paper describes the use elemental iron to control the Fenton reaction, a process in which ferrous ion reacts with hydrogen peroxide. It is widely believed that the Fenton reaction produces free radicals that can degrade organic chemicals. By using elemental iron in place of ferrous iron, we found that the vigor of the Fenton reaction can be controlled, and therefore can be used more effectively to remediate contaminated soil. Laboratory studies were done to compare the elemental iron approach with the original ferrous salt approach. It was found that elemental iron can increase the effectiveness of the Fenton reaction in degrading organic chemical such as Pentachlorophenol (PCP). The mechanism of control lies in the production of ferrous irons from elemental iron in the presence of hydrogen peroxide. 相似文献
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Buda F Ensing B Gribnau MC Baerends EJ 《Chemistry (Weinheim an der Bergstrasse, Germany)》2003,9(14):3436-3444
We investigated the mechanism involved in the oxygen production in the Fenton chemistry by means of density functional theory calculations. This study extends previous work in which we proposed that the Fe(IV)O2+ complex is the key active intermediate in the Fenton reaction. Here we provide a consistent picture of the entire reaction cycle by analyzing how the active species, Fe(IV)O2+, can react with hydrogen peroxide to produce O2 and regenerate the Fe2+ catalyst. These results are also relevant in view of the analogies with important enzyme-catalyzed oxidation reactions. 相似文献
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《印度化学会志》2021,98(9):100115
In this paper the oxidative degradation process of methyl vanillin wastewater was studied by the subcritical water oxidation (HCWO) technology. A subcritical Fenton oxidation (HCFO) system formed while Fe2+ was added as a catalyst. The oxidation degradation kinetics of methyl vanillin wastewater was also studied. The results showed that the suitable process conditions for degradation of methyl vanillin wastewater by HCWO were as follows: temperature of 340 °C, pressure of 24 MPa, oxidant multiple of 1.5, residence time of 217.3 s (flow rate of 2.0 mL min-1). For methyl vanillin wastewater, the HCFO system has no obvious advantages compared to the HCWO system. The activation energy (Ea) of HCWO oxidized methyl vanillin wastewater reaction was 32.6 kJ mol-1, and the pre-exponential factor A was 5.64 s-1. 相似文献
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Iron is the most abundant mineral in the human body and plays essential roles in sustaining life, such as the transport of oxygen to systemic organs. The Fenton reaction is the reaction between iron and hydrogen peroxide, generating hydroxyl radical, which is highly reactive and highly toxic to living cells. “Ferroptosis”, a programmed cell death in which the Fenton reaction is closely involved, has recently received much attention. Furthermore, various applications of the Fenton reaction have been reported in the medical and nutritional fields, such as cancer treatment or sterilization. Here, this review summarizes the recent growing interest in the usefulness of iron and its biological relevance through basic and practical information of the Fenton reaction and recent reports. 相似文献
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锰离子参与的类Fenton反应的HPLC和ESR波谱研究 总被引:14,自引:0,他引:14
利用自旋捕捉-ESR技术及芳环羟基化反应-高效液相色谱(HPLC)法两种方法研究了Mn2+参与的类Fenton反应. 两种方法均检测到Mn2+与H2O2反应产生•OH. 建立了HPLC-荧光检测器对•OH的高灵敏快速检测方法. 检测了超氧化物歧化酶以及几种Mn2+配体对产生•OH的影响. 结果显示, Mn2+与H2O2反应可以发生类Fenton反应, 产生•OH. 这一现象可能是Mn2+引起生物体内氧化损伤的重要原因. 相似文献