The reaction mechanism of catalytic oxidation with hydrogen peroxide and ozone in aqueous solution

2003 ◽  
Vol 47 (1) ◽  
pp. 179-184 ◽  
Author(s):  
J.S. Park ◽  
H. Choi ◽  
K.H. Ahn
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Reaction Mechanism ◽  
Catalytic Oxidation ◽  
Catalytic Ozonation ◽  
Sorption Behavior ◽  
Model Compounds ◽  
Reaction Characteristics ◽  
Hydrophobic Portion ◽  
Bicarbonate Addition

The sorption and catalytic oxidation of model compounds (pCBA and phenanthrene) and NOM on FeOOH were investigated using hydrogen peroxide and ozone, respectively. After oxidation with ozone, the hydrophobic, transphilic, and hydrophilic NOM fractions were isolated using XAD-8 and -4 resins to analyze the reaction characteristics. The sorption of pCBA was strongly dependent upon the pH, but phenanthrene exhibited a sorption behavior that was independent of the pH. In the case of NOM, the hydrophobic portion showed higher sorption affinity than hydrophilic and transphilic at pH 7.2. The concentrations of model compounds and oxidants were measured during the oxidations and the efficiency was compared for tests done with ozone alone and those using catalytic ozonation. Through the comparison of the sorption and decomposition of the model compounds, along with the effects of bicarbonate addition, mechanisms for catalytic oxidation with hydrogen peroxide or ozone were proposed, respectively.

Comparative effect of ozone, chlorine dioxide, and hydrogen peroxide on lignin: Reactions affecting pulp colour in the final bleaching stage

Holzforschung ◽  
2007 ◽  
Vol 61 (6) ◽  
pp. 628-633 ◽  
Author(s):  
Guillaume Pipon ◽  
Christine Chirat ◽  
Dominique Lachenal
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Chlorine Dioxide ◽  
Reaction Mechanisms ◽  
Decomposition Mechanism ◽  
Comparative Effect ◽  
Model Compounds ◽  
Small Chemical

Abstract Several lignin-like model compounds (vanillin, syringaldehyde, guaiacol, syringol, p-benzoquinone, naphthoquinone) and commercial softwood lignin were submitted to small charges of ozone, chlorine dioxide and hydrogen peroxide in aqueous solution under conditions simulating a final bleaching stage. In the case of ozone, the coloured quinone models were directly destroyed, whereas the phenolic models and lignin underwent a two-step decomposition mechanism: chromophores were formed at very low ozone charges, and then were destroyed with increasing ozone charge. Chlorine dioxide had hardly any effects on the quinone models, but formed coloured groups from the phenolic models and lignin. However, these were more intensely coloured and were only partially removed with higher ClO2 charges. As for hydrogen peroxide, the colour of lignin and naphthoquinone were directly removed, at least partially, but high H2O2 charges were necessary. Consequently, ozone seems to be the best reagent for final bleaching in which small chemical charges are applied. We suggest reaction mechanisms between ozone and the phenolic model compounds and p-benzoquinone that can explain the observations.

Kinetics of the catalytic oxidation of model compounds of lignin with hydrogen peroxide in the presence of peroxidase from horse-radish

2010 ◽  
Vol 84 (9) ◽  
pp. 1511-1515
Author(s):  
K. G. Bogolitsyn ◽  
M. A. Aizenshtadt ◽  
A. N. Pryakhin ◽  
V. V. Lunin ◽  
S. A. Pokryshkin
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Oxidation ◽  
Model Compounds ◽  
Kinetics Of

Solvent-free selective oxidation of toluene over metal-doped MCM-22

2019 ◽  
Vol 43 (11) ◽  
pp. 4406-4412 ◽  
Author(s):  
Maaz Nawab ◽  
Sunita Barot ◽  
Rajib Bandyopadhyay
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Mechanism ◽  
Catalytic Oxidation ◽  
Selective Oxidation ◽  
Physicochemical Characterization ◽  
Solvent Free ◽  
Reaction Parameters ◽  
Metal Doping ◽  
Metal Doped

The synthesis of MCM-22, subsequent metal doping, and physicochemical characterization of the products are reported. The solvent-free catalytic oxidation of toluene using hydrogen peroxide is explored, and the reaction parameters are optimized. A possible reaction mechanism is also described.

scholarly journals Heterogeneous catalytic ozonation of ciprofloxacin in aqueous solution using a manganese-modified silicate ore

RSC Advances ◽  
2018 ◽  
Vol 8 (58) ◽  
pp. 33534-33541 ◽  
Author(s):  
Lisha Luo ◽  
Donglei Zou ◽  
Dongwei Lu ◽  
Bingjing Xin ◽  
Ming Zhou ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Catalytic Oxidation ◽  
Catalytic Ozonation ◽  
Oxidation Activity ◽  
Heterogeneous Catalytic

Manganese-modified silicate ore showed remarkable catalytic oxidation activity for ciprofloxacin degradation and the corresponding mechanism was revealed.

Reactions in Activated Peroxide Systems and their Influences on Bleaching Performance

2020 ◽  
Vol 17 ◽  
Author(s):  
Xiaoyan Wang ◽  
Jinmei Du ◽  
Changhai Xu
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Energy Efficiency ◽  
Textile Industry ◽  
High Energy ◽  
Side Reactions ◽  
Competitive Reactions ◽  
High Energy Efficiency ◽  
Hydrolysis Of ◽  
Bleach Activators

Abstract:: Activated peroxide systems are formed by adding so-called bleach activators to aqueous solution of hydrogen peroxide, developed in the seventies of the last century for use in domestic laundry for their high energy efficiency and introduced at the beginning of the 21st century to the textile industry as an approach toward overcoming the extensive energy consumption in bleaching. In activated peroxide systems, bleach activators undergo perhydrolysis to generate more kinetically active peracids that enable bleaching under milder conditions while hydrolysis of bleach activators and decomposition of peracids may occur as side reactions to weaken the bleaching efficiency. This mini-review aims to summarize these competitive reactions in activated peroxide systems and their influence on bleaching performance.

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