Journal ArticleDOI
Effect of Activated Carbon Surface Oxygen- and/or Nitrogen-Containing Groups on Adsorption of Copper(II) Ions from Aqueous Solution†
TLDR
In this paper, the adsorption properties of a modified activated carbon with various oxygen-and/or nitrogen-containing surface groups toward copper ions were studied and the chemical properties of the modified carbon surface were estimated by standard neutralization titration with HCl, NaOH, and NaOC2H5.Abstract:
The adsorption properties of a modified activated carbon with various oxygen- and/or nitrogen-containing surface groups toward copper ions was studied. Previously de-ashed and chemically modified commercial activated carbon D-43/1 (Carbo-Tech, Essen, Germany) was used. The chemical properties of the modified carbon surface were estimated by standard neutralization titration with HCl, NaOH, and NaOC2H5. The adsorption of Cu2+ ions on three modified activated carbons from aqueous CuSO4 solution of various pH was measured. The carbon samples with adsorbed Cu2+ ions were analyzed by spectroscopic methods (X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy). In addition, an electrochemical measurement (cyclic voltammetry) was performed using powdered activated carbon electrodes.While the modification procedures employed alter the surface only slightly, they strongly influence the surface chemical structure. Basic groups are predominant in the heat-treated samples; acidic functional group...read more
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Sorption of divalent metal ions from aqueous solution by carbon nanotubes: A review
TL;DR: In this paper, the technical feasibility of various kinds of raw and surface oxidized carbon nanotubes (CNTs) for sorption of divalent metal ions (Cd 2+, Cu 2+, Ni 2+, Pb 2+ and Zn 2+ ) from aqueous solution is reviewed.
Journal ArticleDOI
Surface functional groups of carbon-based adsorbents and their roles in the removal of heavy metals from aqueous solutions: A critical review.
Xiaodong Yang,Yongshan Wan,Yulin Zheng,Feng He,Zebin Yu,Jun Huang,Hailong Wang,Yong Sik Ok,Yinshan Jiang,Bin Gao +9 more
TL;DR: This work provides a comprehensive review of recent research on various carbon adsorbents in terms of their surface functional groups and the associated removal behaviors and performances to heavy metals in aqueous solutions.
Journal ArticleDOI
Surface modification and characterisation of a coal-based activated carbon
TL;DR: In this article, surface modification of coal-based activated carbon (F400) was performed using thermal and chemical methods using Fourier transform infra red (FTIR) spectroscopy, pH titration, zeta potential measurements and sodium uptake capacity results.
Journal ArticleDOI
Activated carbon modifications to enhance its water treatment applications. An overview.
José Rivera-Utrilla,Manuel Sánchez-Polo,Vicente Gómez-Serrano,Pedro M. Álvarez,Maria C.M. Alvim-Ferraz,Joana M. Dias +5 more
TL;DR: The main objective of this study was to list and compare the advantages and disadvantages of different methodologies to modify the surface of activated carbons for their application as adsorbents to remove organic and inorganic pollutants from aqueous phase.
Journal ArticleDOI
A three-year experiment confirms continuous immobilization of cadmium and lead in contaminated paddy field with biochar amendment
Rongjun Bian,Stephen Joseph,Stephen Joseph,Stephen Joseph,Liqiang Cui,Genxing Pan,Lianqing Li,Xiaoyu Liu,Afeng Zhang,Helen Rutlidge,Singwei Wong,Chee Chia,Christopher E. Marjo,Bin Gong,Paul Munroe,Scott W. Donne +15 more
TL;DR: While rice plant tissues' Cd content was significantly reduced, depending on biochar application rate, reduction in plant Pb concentration was found only in root tissue, and analysis of the fresh and contaminatedBiochar particles indicated that Cd and Pb had probably been bonded with the mineral phases of Al, Fe and P on and around and inside the contaminated biochar particle.
References
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Journal ArticleDOI
Some aspects of the surface chemistry of carbon blacks and other carbons
TL;DR: In this paper, a review of the surface chemistry of carbon blacks and other activated carbons is given, focusing on surface oxides with emphasis on the chemical methods used in the assessment and identification of surface functional groups.
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The characterization of activated carbons with oxygen and nitrogen surface groups
TL;DR: The physicochemical properties and the surface chemical structure of the carbon materials obtained by the modification of the commercial activated carbon D43/1 (Carbo-Tech, Essen, Germany) were studied in this article.
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Electrocatalysts for O2 reduction
TL;DR: In this paper, the proposed mechanisms for O2 reduction on various catalysts are discussed, taking into account the possible role of superoxide radicals, hydogen peroxide and adsorbed dioxygen.
Journal ArticleDOI
Evidence for the protonation of basal plane sites on carbon
TL;DR: In this paper, the authors concluded that two mechanisms are necessary and sufficient to account for the basic properties of carbons: HCl adsorption, electrophoresis, and mass titration.
Journal ArticleDOI
Enhancement of the catalytic activity of activated carbons in oxidation reactions by thermal treatment with ammonia or hydrogen cyanide and observation of a superoxide species as a possible intermediate
TL;DR: In this paper, the catalytic activity of activated carbons in oxidation reactions with O2 is enhanced after treatment with NH3 or HCN at elevated temperatures (600-900°C).