Hydrogen Peroxide and Dioxygen Activation by Dinuclear Copper Complexes in Aqueous Solution: Hydroxyl Radical Production Initiated by Internal Electron Transfer

2008 ◽  
Vol 130 (20) ◽  
pp. 6304-6305 ◽  
Author(s):  
Qing Zhu ◽  
Yuxiang Lian ◽  
Sunita Thyagarajan ◽  
Steven E. Rokita ◽  
Kenneth D. Karlin ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Electron Transfer ◽  
Hydroxyl Radical ◽  
Copper Complexes ◽  
Dioxygen Activation ◽  
Dinuclear Copper ◽  
Radical Production ◽  
Internal Electron

Heterogeneous Fenton Catalytic Removal of Organic Pollutant in Aqueous Solution by using Coal Gangue as a Catalyst

2019 ◽  
Vol 12 (4) ◽  
pp. 312-325
Author(s):  
Jiwei Zhang ◽  
Jingjing Xu ◽  
Shuaixia Liu ◽  
Baoxiang Gu ◽  
Feng Chen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Hydroxyl Radical ◽  
Removal Rate ◽  
Organic Pollutant ◽  
Coal Gangue ◽  
Ion Leakage ◽  
Heterogeneous Fenton ◽  
Solution Ph ◽  
X Ray

Background: Coal gangue was used as a catalyst in heterogeneous Fenton process for the degradation of azo dye and phenol. The influencing factors, such as solution pH gangue concentration and hydrogen peroxide dosage were investigated, and the reaction mechanism between coal gangue and hydrogen peroxide was also discussed. Methods: Experimental results showed that coal gangue has the ability to activate hydrogen peroxide to degrade environmental pollutants in aqueous solution. Under optimal conditions, after 60 minutes of treatment, more than 90.57% of reactive red dye was removed, and the removal efficiency of Chemical Oxygen Demand (COD) up to 72.83%. Results: Both hydroxyl radical and superoxide radical anion participated in the degradation of organic pollutant but hydroxyl radical predominated. Stability tests for coal gangue were also carried out via the continuous degradation experiment and ion leakage analysis. After five times continuous degradation, dye removal rate decreased slightly and the leached Fe was still at very low level (2.24-3.02 mg L-1). The results of Scanning Electron Microscope (SEM), energy dispersive X-Ray Spectrometer (EDS) and X-Ray Powder Diffraction (XRD) indicated that coal gangue catalyst is stable after five times continuous reuse. Conclusion: The progress in this research suggested that coal gangue is a potential nature catalyst for the efficient degradation of organic pollutant in water and wastewater via the Fenton reaction.

The nitroxide Tempo inhibits hydroxyl radical production from the Fenton-like reaction of iron(II)-citrate with hydrogen peroxide

2017 ◽  
Vol 483 (1) ◽  
pp. 159-164 ◽  
Author(s):  
Fengqiang Shi ◽  
Peifeng Zhang ◽  
Yujia Mao ◽  
Can Wang ◽  
Meiqing Zheng ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Hydroxyl Radical ◽  
Radical Production

The oxidation of toluene sorbed on activated carbon in the presence of H2O2 and manganese oxide

2012 ◽  
Vol 66 (11) ◽  
pp. 2349-2354 ◽  
Author(s):  
Si-Hyun Do ◽  
Sung-Ho Kong
Keyword(s):  
Hydrogen Peroxide ◽  
Electron Transfer ◽  
Activated Carbon ◽  
Control System ◽  
Hydroxyl Radical ◽  
Manganese Oxide ◽  
Superoxide Anion ◽  
Gas Flow ◽  
Pure Water ◽  
Gas Purging

We investigated the oxidation of toluene sorbed on activated carbon (AC) in the presence of hydrogen peroxide (H2O2) and pyrolusite (MnO2). Sorbed toluene was prepared by reacting a toluene-saturated solution and AC. The amounts of sorbed toluene (mg of toluene/g of AC) decreased as the amounts of AC were increased. The reaction was conducted in a gas-purging (GP) reactor and the gas flow at the outlet of a GP reactor was carefully maintained. As a result, the percentage of toluene captured by ORBO tube was 28% in the control system with pure water. When H2O2 was catalyzed by AC (i.e. this forms a hydroxyl radical by electron transfer), approximately 17% of the desorbed toluene was oxidized and 68% of toluene remained on AC which was similar to the control system. However, when pyrolusite (650 mg/L) was added together with H2O2 (10,000 mg/L), only 5% of toluene was captured by the ORBO tube and 55% of toluene remained on AC, which indicated that both desorbed and sorbed toluene was oxidized. Moreover, toluene oxidation increased when concentrations of pyrolusite and H2O2 were increased. It was suggested that superoxide anion, which is generated by the reaction of H2O2 and pyrolusite, might stimulate toluene desorption and then toluene in the aqueous phase could be oxidized by hydroxyl radical.

Hydroxyl radical production by ascorbate and hydrogen peroxide

2000 ◽  
Vol 2 (4) ◽  
pp. 343-355 ◽  
Author(s):  
Anthony J. Nappi ◽  
Emily Vass
Keyword(s):  
Hydrogen Peroxide ◽  
Hydroxyl Radical ◽  
Radical Production
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