scholarly journals Enhanced Catalytic Hydrogen Peroxide Production from Hydroxylamine Oxidation on Modified Activated Carbon Fibers: The Role of Surface Chemistry

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1515
Author(s):  
Wei Song ◽  
Ran Zhao ◽  
Lin Yu ◽  
Xiaowei Xie ◽  
Ming Sun ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Activated Carbon ◽  
Photoelectron Spectroscopy ◽  
Reaction Pathway ◽  
Volume Ratio ◽  
Activated Carbon Fiber ◽  
H2o2 Production ◽  
Direct Production ◽  
Modified Activated Carbon ◽  
Production Of Hydrogen

Herein, direct production of hydrogen peroxide (H2O2) through hydroxylamine (NH2OH) oxidation by molecular oxygen was greatly enhanced over modified activated carbon fiber (ACF) catalysts. We revealed that the higher content of pyrrolic/pyridone nitrogen (N5) and carboxyl-anhydride oxygen could effectively promote the higher selectivity and yield of H2O2. By changing the volume ratio of the concentrated H2SO4 and HNO3, the content of N5 and surface oxygen containing groups on ACF were selectively tuned. The ACF catalyst with the highest N5 content and abundant carboxyl-anhydride oxygen containing groups was demonstrated to have the highest activity toward catalytic H2O2 production, enabling the selectivity of H2O2 over 99.3% and the concentration of H2O2 reaching 123 mmol/L. The crucial effects of nitrogen species were expounded by the correlation of the selectivity of H2O2 with the content of N5 from X-ray photoelectron spectroscopy (XPS). The possible reaction pathway over ACF catalysts promoted by N5 was also shown.

Direct production of hydrogen peroxide from CO, O2, and H2O over a novel alumina-supported Cu catalyst

2004 ◽  
Vol 28 (12) ◽  
pp. 1431 ◽  
Author(s):  
Wei-Liang Feng ◽  
Yong Cao ◽  
Nan Yi ◽  
Wei-Lin Dai ◽  
Kang-Nian Fan
Keyword(s):  
Hydrogen Peroxide ◽  
Direct Production ◽  
Production Of Hydrogen ◽  
Cu Catalyst

The Adsorption of Low Concentration SO2 with the Second Modified Activated Carbon Fiber Loaded Mn

2011 ◽  
Vol 109 ◽  
pp. 125-130
Author(s):  
Jie Fu ◽  
Ying Chun Yan ◽  
Jing Zhang
Keyword(s):  
Activated Carbon ◽  
High Temperature ◽  
Adsorption Properties ◽  
Activated Carbon Fiber ◽  
Impregnation Method ◽  
Air Velocity ◽  
Desulfurization Rate ◽  
Modified Activated Carbon ◽  
Low Concentration ◽  
Adsorption Temperature

The Mn loaded ACF (ACF-Mn), prepared by impregnation method combined with activation method under high temperature, can be used to adsorb the low concentration SO2. The modified ACF was characterized by iodine value and functional groups. The adsorption properties of low concentration SO2 on ACF-Mn-Cu50 were also studied. The result showed that the adsorption properties were improved with the granular Cu. Amount of Mn particles attached to the surface of ACF and the desulfurization rate of ACF-Mn-Cu50 both increased after second modification when the adsorption temperature was 60°C, the air velocity was Q1=0.3 L/min and Q2=0.4 L/min respectively and the concentration of SO2 was 0.62×10-4 μg/ml.

Effect of Modification with Nitric Acid and Hydrogen Peroxide on Chromium (VI) Adsorption by Activated Carbon Fiber

2012 ◽  
Vol 518-523 ◽  
pp. 2099-2103
Author(s):  
Guang Zhou Qu ◽  
Hai Bing Ji ◽  
Ran Xiao ◽  
Dong Li Liang
Keyword(s):  
Hydrogen Peroxide ◽  
Activated Carbon ◽  
Nitric Acid ◽  
Carbon Fiber ◽  
Adsorption Capacity ◽  
Adsorption Kinetics ◽  
Ph Value ◽  
Activated Carbon Fiber ◽  
Order Kinetic ◽  
Adsorption Amount

The activated carbon fiber (ACF) was treated by different concentration nitric acid (HNO3) and hydrogen peroxide (H2O2) oxidization to enhance its adsorption capacity to hexavalent chromium (Cr6+) ion. The adsorption amount and adsorption kinetics of Cr6+ion on ACFs, and the surface chemical groups were investigated. The results showed that the modified ACFs with 1% HNO3and 10% H2O2had a better adsorption capacity, respectively. The adsorption amount of ACFs was affected strongly solution pH value, and decreased significantly with increasing of the pH value. The adsorption kinetics indicated that the adsorption rates of Cr6+ ion on different modified ACFs were well fitted with the pseudo-second-order kinetic model. After 1% HNO3and 10% H2O2modification, respectively, the total acidic oxygen-containing groups on ACFs surface had an increase obviously, which might be enhance the adsorption amount of Cr6+ion on ACFs.

scholarly journals Hydrogen peroxide production and killing of Staphylococcus aureus by human polymorphonuclear leukocytes

Blood ◽  
1977 ◽  
Vol 49 (3) ◽  
pp. 437-444 ◽  
Author(s):  
MF Tsan ◽  
KH Douglass ◽  
PA McIntyre
Keyword(s):  
Hydrogen Peroxide ◽  
Staphylococcus Aureus ◽  
Horseradish Peroxidase ◽  
Polymorphonuclear Leukocytes ◽  
H2o2 Production ◽  
Intracellular Killing ◽  
Hydrogen Peroxide Production ◽  
Production Of Hydrogen ◽  
Human Polymorphonuclear Leukocytes ◽  
Stimulation Of

Abstract The effects of bacterial neuraminidase on production of hydrogen peroxide (H2O2) and killing of Staphylococcus aureus by human polymorphonuclear leukocytes (PMN) were studied. The concentration of H2O2 was measured by the disappearance of scopoletin fluorescence in the presence of horseradish peroxidase. The results indicated that desialylation of human PMN inhibited the stimulation of H2O2 production during phagocytosis. It also markedly impaired the killing of S. aureus. Impaired killing of S. aureus by desialylated PMN was due to impaired intracellular killing rather than defective phagocytosis.

Attachment and Growth of Biomass on Surface-Modified Activated Carbon Fibers

1992 ◽  
Vol 26 (3-4) ◽  
pp. 665-671 ◽  
Author(s):  
K. Kutics ◽  
M. Suzuki
Keyword(s):  
Activated Carbon ◽  
Activated Carbons ◽  
Surface Acidity ◽  
Calculated Data ◽  
Bacterial Biomass ◽  
Activated Carbon Fiber ◽  
Continuous Stirred Tank Reactor ◽  
Modified Activated Carbon ◽  
Start Up ◽  
Surface Modified

Activated carbon fiber (ACF) was used as a model of commercial activated carbons to examine the effect of surface chemistry on the attachment behavior of bacterial biomass. Surface acidity was found to enhance the biomass-ACF interaction. When ACFs were applied as biomass support media in a continuous stirred tank reactor, surface acidity of the carbon resulted in faster biomass growth in the start-up phase. The start-up phase was simulated by a simple biomass attachment kinetics model. Experimental and calculated data show a reasonable agreement, with the exception of the hydrogenated specimen, which was interpreted by assuming that the hydrogen-reduced surface is highly reactive and then may undergo oxidation in the initial phase of operation so that the adsorption characteristics are altered.

Direct Production of Hydrogen Peroxide with Palladium Supported on Phosphate Viologen Phosphonate Catalysts

2000 ◽  
Vol 196 (2) ◽  
pp. 366-374 ◽  
Author(s):  
Venkatesan V. Krishnan ◽  
Alexandre G. Dokoutchaev ◽  
Mark E. Thompson
Keyword(s):  
Hydrogen Peroxide ◽  
Direct Production ◽  
Production Of Hydrogen

Study on adsorption of terramycini hydrochloridum from aquaculture wastewater using modified activated carbon fiber

2019 ◽  
Vol 146 ◽  
pp. 351-361
Author(s):  
Xiaocai Yu ◽  
Hang Yang ◽  
Jinghua Liu ◽  
Liping Wang ◽  
Meichen Gu
Keyword(s):  
Activated Carbon ◽  
Carbon Fiber ◽  
Activated Carbon Fiber ◽  
Modified Activated Carbon ◽  
Aquaculture Wastewater
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