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Open AccessArticle

Factors Influencing NO2 Adsorption/Reduction on Microporous Activated Carbon: Porosity vs. Surface Chemistry

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Institut de Science des Matériaux de Mulhouse, IS2M-UMR7361-CNRS-UHA, 15 Rue Jean Starcky, 68057 Mulhouse, France
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Laboratoire Génie des Procédés et Systèmes Industriels, Université de Gabès, St Omar El Khattab, 6029 Gabes, Tunisia
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Author to whom correspondence should be addressed.
Materials 2018, 11(4), 622; https://doi.org/10.3390/ma11040622
Received: 14 March 2018 / Revised: 12 April 2018 / Accepted: 16 April 2018 / Published: 18 April 2018
(This article belongs to the Special Issue Green Activated Carbons)
The textural properties and surface chemistry of different activated carbons, prepared by the chemical activation of olive stones, have been investigated in order to gain insight on the NO2 adsorption mechanism. The parent chemical activated carbon was prepared by the impregnation of olive stones in phosphoric acid followed by thermal carbonization. Then, the textural properties and surface chemistry were modified by chemical treatments including nitric acid, sodium hydroxide and/or a thermal treatment at 900 °C. The main properties of the parent and modified activated carbons were analyzed by N2-adsorption, scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR) techniques, in order to enlighten the modifications issued from the chemical and thermal treatments. The NO2 adsorption capacities of the different activated carbons were measured in fixed bed experiments under 500 ppmv NO2 concentrations at room temperature. Temperature programmed desorption (TPD) was applied after adsorption tests in order to quantify the amount of the physisorbed and chemisorbed NO2. The obtained results showed that the development of microporosity, the presence of oxygen-free sites, and the presence of basic surface groups are key factors for the efficient adsorption of NO2. View Full-Text
Keywords: activated carbon; olive stones; textural properties; surface chemistry; NO2 adsorption; chemisorption; physisorption activated carbon; olive stones; textural properties; surface chemistry; NO2 adsorption; chemisorption; physisorption
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MDPI and ACS Style

Ghouma, I.; Jeguirim, M.; Limousy, L.; Bader, N.; Ouederni, A.; Bennici, S. Factors Influencing NO2 Adsorption/Reduction on Microporous Activated Carbon: Porosity vs. Surface Chemistry. Materials 2018, 11, 622.

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