Assessing the functional groups in activated carbons through a multi-technique approach

2022 ◽  
Author(s):  
Eleonora Vottero ◽  
Michele Carosso ◽  
Riccardo Pellegrini ◽  
Andrea Piovano ◽  
Elena Groppo
Keyword(s):  
Surface Chemistry ◽  
Functional Groups ◽  
Activated Carbons ◽  
Catalytic Applications

Activated carbons play a key role in catalytic applications thanks to the possibility to tune their surface chemistry through the change of the precursor or of the activation treatment. However,...

scholarly journals Surface Modification and Characterization of Coconut Shell-Based Activated Carbon Subjected to Acidic and Alkaline Treatments

2017 ◽  
Vol 4 (2) ◽  
pp. 186-194 ◽  
Author(s):  
Tan I. A. W. ◽  
Abdullah M. O. ◽  
Lim L. L. P. ◽  
Yeo T. H. C.
Keyword(s):  
Activated Carbon ◽  
Surface Morphology ◽  
Surface Chemistry ◽  
Pore Structure ◽  
Surface Area ◽  
Functional Groups ◽  
Activated Carbons ◽  
Coconut Shell ◽  
Bet Surface Area ◽  
Textural Characterization

Activated carbon derived from agricultural biomass has been increasingly recognized as a multifunctional material for various applications according to its physicochemical characteristics. The application of activated carbon in adsorption process mainly depends on the surface chemistry and pore structure which is greatly influenced by the treatment method. This study aims to compare the textural characteristics, surface chemistry and surface morphology of coconut shell-based activated carbon modified using chemical surface treatments with hydrochloric acid (HCl) and sodium hydroxide (NaOH). The untreated and treated activated carbons were characterized for their physical and chemical properties including the Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and textural characterization. The FTIR spectra displayed bands confirming the presence of carboxyl, hydroxyl and carbonyl functional groups. The Brunauer–Emmett–Teller (BET) surface area of the untreated activated carbon was 436 m2/g whereas the surface area of the activated carbon modified using 1M NaOH, 1M HCl and 2M HCl was 346, 525 and 372 m2/g, respectively. SEM micrographs showed that many large pores in a honeycomb shape were clearly found on the surface of 1M HCl sample. The pore structure of the activated carbon treated with 2M HCl and NaOH was partially destroyed or enlarged, which decreased the BET surface area. The modification of the coconut shell-based activated carbon with acidic and alkaline treatments has successfully altered the surface functional groups, surface morphology and textural properties of the activated carbon which could improve its adsorptive selectivity on a certain adsorbate.

The influential factors towards graphene oxides removal by activated carbons: Activated functional groups vs BET surface area

2018 ◽  
Vol 271 ◽  
pp. 142-150 ◽  
Author(s):  
Ju Sun ◽  
Xia Liu ◽  
Shengxia Duan ◽  
Ahmed Alsaedi ◽  
Fengsong Zhang ◽  
...  
Keyword(s):  
Surface Area ◽  
Functional Groups ◽  
Activated Carbons ◽  
Influential Factors ◽  
Bet Surface Area ◽  
Graphene Oxides

Revisiting the Effect of Surface Chemistry on Adsorption of Water on Activated Carbons

1999 ◽  
Vol 103 (19) ◽  
pp. 3877-3884 ◽  
Author(s):  
Issa I. Salame ◽  
Andrey Bagreev ◽  
Teresa J. Bandosz
Keyword(s):  
Surface Chemistry ◽  
Activated Carbons ◽  
Adsorption Of Water ◽  
Effect Of Surface

scholarly journals 5-Hydroxymethylfurfural Oxidation Over Platinum Supported on Açaí Seed Coal for Synthesis of 2,5-Furandicarboxylic Acid

2021 ◽  
Vol 12 (5) ◽  
pp. 6632-6650
Keyword(s):  
Functional Groups ◽  
Renewable Resources ◽  
Activated Carbons ◽  
High Dispersion ◽  
Pt Catalysts ◽  
N2 Adsorption ◽  
Anchoring Effect ◽  
Furandicarboxylic Acid ◽  
Oxygenated Functional Groups ◽  
Petrochemical Industries

2,5-furandicarboxylic acid (FDCA) is produced from the selective oxidation of 5-hydroxymethylfurfural (HMF) and is an important platform molecule applied in the pharmaceutical and petrochemical industries. Activated carbons produced from renewable resources are useful materials due to their physicochemical properties, defined mainly by the oxygenated functional groups on their surface. This work studies the oxidation of HMF to FDCA over Pt catalysts supported on açaí coal. The catalysts were characterized by N2 adsorption, XPS, ToF-SIMS, FTIR, XRD, Raman, TEM, SEM, TPR-H2, and TGA/DTA. The conversion of HMF to FDCA in an alkaline medium occurred via hydroxymethyl-2-furancarboxylic acid (HMFCA), which was oxidized to 5-formylfurancarboxylic acid (FFCA) and FDCA. The catalytic tests showed a high conversion of HMF with a 93.6% yield of FDCA. The excellent results were attributed to the high dispersion of Pt on the support and the presence of oxygenated functional groups on the coal surface. The functional groups increased the interaction between Pt-HMF and Pt-furan intermediates and favored a higher dispersion of platinum (53.3%) due to an anchoring effect.

Influence of Surface Chemistry on the Adsorption of Oxygenated Hydrocarbons on Activated Carbons

Langmuir ◽  
2010 ◽  
Vol 26 (24) ◽  
pp. 18824-18833 ◽  
Author(s):  
Camelia Matei Ghimbeu ◽  
Roger Gadiou ◽  
Joseph Dentzer ◽  
Dominique Schwartz ◽  
Cathie Vix-Guterl
Keyword(s):  
Surface Chemistry ◽  
Activated Carbons ◽  
Oxygenated Hydrocarbons
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