Catalytic Decomposition Kinetics and Mechanism of Hydrogen Peroxide by Modified Activated Carbon

2011 ◽  
Vol 243-249 ◽  
pp. 4860-4863
Author(s):  
Zhen Zhong Liu ◽  
Hui Ping Deng ◽  
Zhan Li Chen
Keyword(s):  
Activated Carbon ◽  
Manganese Oxides ◽  
Catalytic Properties ◽  
Catalytic Decomposition ◽  
Carbon Composites ◽  
Order Kinetic ◽  
Modified Activated Carbon ◽  
First Order ◽  
Peroxide Decomposition ◽  
Iron And Manganese

Modified activated carbon composites were prepared and their catalytic properties were evaluated in the H2O2decomposition. Activated carbon alone showed very low activities compared to iron and manganese oxides / activated carbon composites, suggesting that the presence of Fe and Mn in the oxide plays an important role for the activation of H2O2. The presence of Mn in the composite structure produced a remarkable increase in the reactivity. The obtained results showed that the peroxide decomposition catalyzed by GACFM met pseudo-first-order kinetic and the maximum OH· production was on GACF1M3.The decomposition mechanism of H2O2was analyzed in detail.

Influence of Catalytic Conditions on Hydrogen Peroxide Decomposition by Modified Activated Carbon

2011 ◽  
Vol 243-249 ◽  
pp. 4793-4796
Author(s):  
Xiao Hua Huang ◽  
Zhen Zhong Liu
Keyword(s):  
Hydrogen Peroxide ◽  
Activated Carbon ◽  
Manganese Oxide ◽  
Opposite Effect ◽  
Carbon Composite ◽  
Hydrogen Peroxide Decomposition ◽  
Modified Activated Carbon ◽  
Usage Rate ◽  
Peroxide Decomposition ◽  
Iron And Manganese

Iron and manganese oxide /activated carbon composite (GACF1M3) was prepared and the experiment conditions including pH ,GACF1M3 dosage and organic effect were evaluated in the H2O2decomposition. The results showed that the decomposition of H2O2increased with time ,GACF1M3 can decompose H2O2about 75% in 120min . The amount of H2O2reflected the maximum usage rate of the GACF1M3 when the dose was 100mg. The highest H2O2decomposition of GACF1M3 was achieved at pH 8.5, the maximum OH· production was pH 5.0.The presence of HA can increase H2O2decomposition while TCP has the opposite effect.

scholarly journals Adsorption of Arsenate by Nano Scaled Activated Carbon Modified by Iron and Manganese Oxides

2017 ◽  
Vol 9 (10) ◽  
pp. 1684 ◽  
Author(s):  
George Gallios ◽  
Athanasia Tolkou ◽  
Ioannis Katsoyiannis ◽  
Katarina Stefusova ◽  
Miroslava Vaclavikova ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Manganese Oxides ◽  
Iron And Manganese

Rhenium and manganese modified activated carbon as catalyst for methanol decomposition

2007 ◽  
Vol 85 (2) ◽  
pp. 118-123 ◽  
Author(s):  
T Tsoncheva ◽  
S Vankova ◽  
O Bozhkov ◽  
D Mehandjiev
Keyword(s):  
Catalytic Activity ◽  
Activated Carbon ◽  
Carbon Materials ◽  
Catalytic Properties ◽  
Methanol Decomposition ◽  
Complex Character ◽  
Active Centre ◽  
Modified Activated Carbon

Bicomponent manganese and rhenium modified activated carbon materials, prepared by different methods, are studied and compared with the corresponding monocomponent materials as catalysts in methanol decomposition to CO and hydrogen. The best catalytic activity and stability is observed for the sample obtained by simultaneous deposition of Mn and Re precursors. The complex character of the catalytic active centre, including manganese and rhenium irons in various oxidative states, is discussed. The determining role of the Mn(II) ions in the improvement of the catalytic properties is assumed.Key words: rhenium, manganese, activated carbon, methanol decomposition.

scholarly journals Modified Activated Carbon Fiber Felt for the Electrosorption of Norfloxacin in Aqueous Solution

2020 ◽  
Vol 12 (10) ◽  
pp. 3986
Author(s):  
Xianzhen Li ◽  
Yue Hu ◽  
Diao She ◽  
Wei-Bo Shen
Keyword(s):  
Activated Carbon ◽  
Nitric Acid ◽  
Carbon Fiber ◽  
Activated Carbon Fiber ◽  
Order Kinetic ◽  
Human Beings ◽  
Adsorption Effect ◽  
Regeneration Rate ◽  
Modified Activated Carbon ◽  
Carbon Fiber Felt

As an antibiotic, Norfloxacin (NOR) is widely found in the water environment and presents considerable harm to human beings. At present, the preparation of removal materials is complicated, and the removal efficiency is not high. The adsorption effect of modified activated carbon fiber felt (MACFF) electrosorption and its influencing factors on NOR were studied. Activated carbon fiber felt (ACFF) was modified with 20% nitric acid, and the ACFFs were characterized by SEM, TEM, and FTIR both before and after modification. The optimal working conditions for electrosorption with an MACFF electrode were as follows: the voltage was 1.0 V, the pH was 6, and the plate spacing was 10 mm. The maximum adsorption capacity of the MACFF for NOR was 128.55 mg/g. Model fitting showed that pseudo-second-order kinetic model and Langmuir model were more suitable for explaining this adsorption process. In addition, this study found that, with 20% nitric acid as the regeneration liquid and under the reverse charging method, the regeneration rate of the MACFF electrode was maintained at approximately 96% and the regeneration was good, therefore, this technology can not only save operation costs but also has good development prospects in sewage treatment.

Removal of Trace Mercury in Water by Iron Manganese Oxide Modified Biochar

2021 ◽  
Vol 15 (5) ◽  
pp. 629-638
Author(s):  
Sheng Liu ◽  
Xujie Li ◽  
Zilin Su ◽  
Linya Yi ◽  
Zhanli Chen ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Kinetic Model ◽  
Manganese Oxide ◽  
Low Cost ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Process Technology ◽  
Modified Activated Carbon ◽  
Modified Biochar ◽  
Iron Manganese

Mercury wastewater is a kind of heavy metal wastewater discharged from many industrial processes. The treatment of a large amount of mercury-containing wastewater increasingly requires high-efficiency, low-cost, and low-cost treatment materials, treatment processes and technologies to ensure compliance with mercury standards. This paper mainly studies the effect of iron-manganese oxide modified biochar on the removal of trace mercury in water. The prepared activated carbon is added to a mercury solution with a proper concentration, and a single factor adsorption experiment of pH, initial concentration, amount of activated carbon, particle size, temperature, and time is performed. In this paper, iron manganese oxide modified biochar is listed as the research object. The activated carbon is studied through the adsorption characteristics, adsorption mechanism and influencing factors of mercury in the solution, and the process technology and optimization parameters of the modified activated carbon to treat mercury-containing wastewater are explored. The maximum adsorption capacity of modified activated carbon calculated by Lagergren quasi-first-order kinetic model is 16.62 mg/g. This indicates that the adsorption kinetics of Hg by iron-manganese oxide modified biochar is more consistent with the Lagergren quasi-secondary kinetic model and is also more efficient.

scholarly journals Nature and evolution of Pd catalysts supported on activated carbon fibers during the catalytic reduction of bromate in water

2020 ◽  
Vol 10 (11) ◽  
pp. 3646-3653
Author(s):  
Jose L. Cerrillo ◽  
Christian W. Lopes ◽  
Fernando Rey ◽  
Giovanni Agostini ◽  
Lioubov Kiwi-Minsker ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Carbon Fibers ◽  
Crystal Size ◽  
Catalytic Reduction ◽  
Order Kinetic ◽  
Activated Carbon Fibers ◽  
Pd Catalysts ◽  
First Order ◽  
Pseudo First Order ◽  
Bromate Reduction

Pd/ACF are active catalysts for the bromate reduction and their activity depends on the Pd crystal size with a pseudo-first order kinetic respect to BrO3− and H2 partial pressure.

Core-shell Mn3O4/birnessite-MnO2 hierachical structure with enhanced adsorption towards methylene blue

2016 ◽  
Vol 09 (02) ◽  
pp. 1650020 ◽  
Author(s):  
Feifan Huang ◽  
Bowen Zhou ◽  
Han Xiao ◽  
Wei Xiao
Keyword(s):  
Methylene Blue ◽  
Manganese Oxides ◽  
Core Shell ◽  
Order Kinetic ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Order ◽  
Pseudo Second Order ◽  
Enhanced Adsorption ◽  
The Individual

The core-shell Mn3O4/birnessite-MnO2 (Mn3O4/MnO2) was successfully established by assembly of birnessite-type MnO2 over Mn3O4 backbones. The product was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), as well as UV–vis absorption spectra (UV–vis) to assess its adsorption of methylene blue (MB) from neutral aqueous solutions. Compared to the individual Mn3O4, the prepared Mn3O4/MnO2 shows enhanced adsorption capability towards MB. Such enhancement is due to the higher surface area and the unique nanosheet shells. The adsorption of MB on the surface of Mn3O4/MnO2 was studied in terms of pseudo-first-order and the pseudo-second-order kinetic models, and the latter was found better. The present study indicates that hierarchically structured core-shell manganese oxides are promising adsorbents for wastewater treatment.

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