Oxidation of activated carbon by hydrogen peroxide. Study of surface functional groups by FT-i.r.

Abstract In this study, activated carbon (AC) was prepared from walnut shell using chemical activation. The surface chemistry of the prepared AC was modified by introducing or blocking certain functional groups, and the role of the different functional groups involved in the copper uptake was investigated. The structural and chemical heterogeneity of the produced carbons are characterized by Fourier transform infrared spectrometry, X-ray photoelectron spectroscopy, Boehm titration method and N2/77 K adsorption isotherm analysis. The equilibrium and the kinetics of copper adsorption onto AC were studied. The results demonstrated that the functional groups on AC played an important role in copper uptake. Among various surface functional groups, the oxygen-containing group was found to play a critical role in the copper uptake, and oxidation is the most effective way to improve Cu (II) adsorption onto AC. Ion-exchange was identified to be the dominant mechanism in the copper uptake by AC. Some other types of interactions, like complexation, were also proven to be involved in the adsorption process, while physical force was found to play a small role in the copper uptake. The regeneration of copper-loaded AC and the recovery of copper were also studied to evaluate the reusability of the oxidized AC.

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Studies on pore structures and surface functional groups of pitch-based activated carbon fibers

Journal of Colloid and Interface Science ◽

10.1016/s0021-9797(02)00081-4 ◽

2003 ◽

Vol 260 (2) ◽

pp. 259-264 ◽

Cited By ~ 85

Author(s):

Soo-Jin Park ◽

Yu-Sin Jang ◽

Jae-Woon Shim ◽

Seung-Kon Ryu

Keyword(s):

Activated Carbon ◽

Functional Groups ◽

Carbon Fibers ◽

Activated Carbon Fibers ◽

Surface Functional Groups ◽

Pore Structures

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Nitrogen-Doped Activated Carbon-Based Ammonia Sensors: Effect of Specific Surface Functional Groups on Carbon Electronic Properties

ACS Sensors ◽

10.1021/acssensors.6b00093 ◽

2016 ◽

Vol 1 (5) ◽

pp. 591-599 ◽

Cited By ~ 29

Author(s):

Nikolina A. Travlou ◽

Christopher Ushay ◽

Mykola Seredych ◽

Enrique Rodríguez-Castellón ◽

Teresa J. Bandosz

Keyword(s):

Activated Carbon ◽

Specific Surface ◽

Electronic Properties ◽

Functional Groups ◽

Surface Functional Groups ◽

Nitrogen Doped ◽

Ammonia Sensors ◽

Carbon Based

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Immersion Calorimetry for the Characterization of PD Catalysts Supported on Activated Carbon

E-Journal of Chemistry ◽

10.1155/2009/495819 ◽

2009 ◽

Vol 6 (4) ◽

pp. 1221-1227

Author(s):

Liliana Giraldo ◽

Juan Carlos Moreno-Piraján

Keyword(s):

Hydrogen Peroxide ◽

Activated Carbon ◽

Functional Groups ◽

Activated Carbons ◽

The Other ◽

Pd Catalysts ◽

Immersion Calorimetry ◽

Characterization Techniques ◽

The Difference

Activated carbons obtained from coconut peel were oxidized using hydrogen peroxide. Superficial characteristics of these carbons were determined through N2and CO2isotherms and functional groups were characterized by TPD. Finally, the microcalorimetry technique was used in order to obtain the immersion enthalpies in diverse liquids and established the relation between them and the results obtained by the other characterization techniques. The results suggested that the immersion calorimetry allow establishing the difference between the supports and the catalysts.

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Synergistic Effect of Nitric Acid Modified and Cu(II)-Loaded Activated Carbon on Catalytic Ozonation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1073-1076.708 ◽

2014 ◽

Vol 1073-1076 ◽

pp. 708-711

Author(s):

Jing Zhang ◽

Ya Wei Du ◽

Xiao Jing Liu ◽

Yu Wen Zhou ◽

Chun Liu ◽

...

Keyword(s):

Catalytic Activity ◽

Activated Carbon ◽

Nitric Acid ◽

Synergistic Effect ◽

Functional Groups ◽

Catalytic Ozonation ◽

Reusable Catalyst ◽

Surface Functional Groups ◽

Acid Modification ◽

Toc Removal

The surface properties and performance of activated carbon (AC) used for catalytic ozonation were investigated after nitric acid modification (N-AC) and Cu (II)-loaded (N-Cu-AC). The results showed that the nitric acid modification could increase the amount of surface functional groups of AC. As a result, the adsorption capacity and catalytic activity of AC could be improved. The surface functional groups and Cu (II)-loaded of N-Cu-AC showed a synergistic effect on catalytic ozonation, where the catalytic activity of Cu (II)-loaded was more stable. N-Cu-AC was an effective and reusable catalyst for catalytic ozonation. The highest TOC removal efficiency of 58.0% could be achieved when N-Cu-AC was used for 60 min-catalytic ozonation treatment of acid red 3R.

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Microstructure and Oxygen Functional Groups on Modified Liquefied Wooden Activated Carbon Fibers with Hydrogen Peroxide

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.433-435.2003 ◽

2013 ◽

Vol 433-435 ◽

pp. 2003-2007 ◽

Cited By ~ 2

Author(s):

Wei Gao ◽

Gaungjie Zhao

Keyword(s):

Hydrogen Peroxide ◽

Activated Carbon ◽

Surface Area ◽

Functional Groups ◽

Carbon Fibers ◽

Photoelectron Spectroscopy ◽

Density Functional ◽

Activated Carbon Fibers ◽

Average Pore ◽

Oxygen Functional Groups

The aim of this study is to investigate changes in microstructure and oxygen functional groups of liquefied wood activated carbon fibers using density functional theory, FTIR, X-ray photoelectron spectroscopy. Samples were immersed with hydrogen peroxide (H2O2) at three concentrations (15, 20, and 25 wt%), three temperatures (90, 70, and 50 °C) for three periods of time (1, 2, and 3 h). The results reveals that the pores average radius narrow, and micropores turn into mesopores or macropores with the increasing process, which brings about the surface area of treated samples decrease. Numerous oxygen functional groups are observed in the treated samples, and the ratios of oxygen and carbon increase from 3.2% before treated to 14.7% with H2O2 modification. The results confirm that the average pore radius and surface area decrease during treatment due to concentration and temperature. What is more, oxygen functional groups increase significantly with increasing treatment concentration.

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