Degradation Pathways of Pentachlorophenol by Photo-Fenton Systems in the Presence of Iron(III), Humic Acid, and Hydrogen Peroxide

2001 ◽  
Vol 35 (9) ◽  
pp. 1771-1778 ◽  
Author(s):  
Masami Fukushima ◽  
Kenji Tatsumi
Keyword(s):  
Hydrogen Peroxide ◽  
Humic Acid ◽  
Degradation Pathways

Degradation of humic acid using hydrogen peroxide activated by CuO-Co3O4@AC under microwave irradiation

2017 ◽  
Vol 330 ◽  
pp. 783-791 ◽  
Author(s):  
Xiaosheng Yao ◽  
Qintie Lin ◽  
Lingze Zeng ◽  
Jiangxin Xiang ◽  
Guangcai Yin ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Humic Acid ◽  
Microwave Irradiation

scholarly journals The direct synthesis of hydrogen peroxide using a combination of a hydrophobic solvent and water

2020 ◽  
Vol 10 (24) ◽  
pp. 8203-8212
Author(s):  
Adeeba Akram ◽  
Greg Shaw ◽  
Richard J. Lewis ◽  
Marco Piccinini ◽  
David J. Morgan ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Direct Synthesis ◽  
Degradation Pathways ◽  
Significant Suppression ◽  
Hydrophobic Solvent

The use of a hydrophobic solvent in combination with water leads to significant suppression of H2O2 degradation pathways over a AuPd/C catalyst.

Formation of hydrogen peroxide by aqueous ozonation of humic acid and aromatic hydrocarbons

Chemosphere ◽  
1990 ◽  
Vol 20 (5) ◽  
pp. 525-531 ◽  
Author(s):  
Katsuhiko Nakamuro ◽  
Hitoshi Ueno ◽  
Michiko Nakao ◽  
Yasuyoshi Sayato
Keyword(s):  
Hydrogen Peroxide ◽  
Humic Acid ◽  
Aromatic Hydrocarbons

scholarly journals Highly efficient UV/H2O2 technology for the removal of nifedipine antibiotics: Kinetics, co-existing anions and degradation pathways

PLoS ONE ◽  
2021 ◽  
Vol 16 (10) ◽  
pp. e0258483
Author(s):  
Wenping Dong ◽  
Chuanxi Yang ◽  
Lingli Zhang ◽  
Qiang Su ◽  
Xiaofeng Zou ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Hydrogen Peroxide ◽  
Degradation Rate ◽  
Degradation Kinetics ◽  
Degradation Pathways ◽  
Oxygen Species ◽  
Highly Efficient ◽  
Initial Ph ◽  
Primary Key ◽  
Kinetics Of

This study investigates the degradation of nifedipine (NIF) by using a novel and highly efficient ultraviolet light combined with hydrogen peroxide (UV/H2O2). The degradation rate and degradation kinetics of NIF first increased and then remained constant as the H2O2 dose increased, and the quasi-percolation threshold was an H2O2 dose of 0.378 mmol/L. An increase in the initial pH and divalent anions (SO42- and CO32-) resulted in a linear decrease of NIF (the R2 of the initial pH, SO42- and CO32- was 0.6884, 0.9939 and 0.8589, respectively). The effect of monovalent anions was complex; Cl- and NO3- had opposite effects: low Cl- or high NO3- promoted degradation, and high Cl- or low NO3- inhibited the degradation of NIF. The degradation rate and kinetics constant of NIF via UV/H2O2 were 99.94% and 1.45569 min-1, respectively, and the NIF concentration = 5 mg/L, pH = 7, the H2O2 dose = 0.52 mmol/L, T = 20 ℃ and the reaction time = 5 min. The ·OH was the primary key reactive oxygen species (ROS) and ·O2- was the secondary key ROS. There were 11 intermediate products (P345, P329, P329-2, P315, P301, P274, P271, P241, P200, P181 and P158) and 2 degradation pathways (dehydrogenation of NIF → P345 → P274 and dehydration of NIF → P329 → P315).

Ozonation by-Products of Humic Acid in the Presence of Hydrogen Peroxide

2014 ◽  
Vol 1030-1032 ◽  
pp. 134-137
Author(s):  
Hyun Sang Shin ◽  
Dong Seok Rhee
Keyword(s):  
Hydrogen Peroxide ◽  
Humic Acid ◽  
Organic Carbon ◽  
Total Organic Carbon ◽  
Sample Solution ◽  
Injection Time ◽  
Total Organic Carbon Removal ◽  
Initial Ph ◽  
Decreasing Ph ◽  
By Products

Ozonation of humic acid has been conducted in the presence of hydrogen peroxide as catalyst. Besides the study of total organic carbon removal in the ozonation, ozonation by-products were investigated through the change of injected concentration of H2O2, initial pH of aqueous humic acid and injection time of H2O2. The variation of hydrogen peroxide and formaldehyde contents in the processes are mainly evaluated. The formaldehyde was formed less in ozonation with hydrogen peroxide system than without it. When initial pH in solution was changed from 3.5 to 10.5, the formaldehyde was formed with the highest concentration at pH 5. In addition, the concentration of H2O2 produced by ozonation was found to be increased with decreasing pH of the sample solution in this process.

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