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SM ISO690:2012 LUPASCU, Tudor, CIBOTARU, Silvia, TIMBALIUC, Nina. Study of the surface chemistry of intact and modified charcoal. In: The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova, 28-30 mai 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Chimie al AȘM, 2014, p. 165. |
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The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova 2014 | ||||||
Conferința "The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova" Chișinău, Moldova, 28-30 mai 2014 | ||||||
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Pag. 165-165 | ||||||
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The use of carbon adsorbents is one of the most safe and effective methods of water MS- intact charcoal; MOR- charcoal oxidized at cool; MOC-charcoal oxidized at room |
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Modified carbon materials have an important role in the immobilization of heavy<br />metal ions from aqueous solutions due to the fact that different functional groups: carboxyl,<br />phenolic, hydroxyl form on the surface of adsorbents during the oxidation process [2].<br />The purpose of this study was to investigate the surface chemistry of intact charcoal and<br />of charcoal oxidized under different conditions. Special tests were performed for the oxidation of<br />charcoal at room temperature and by cooling to -10 °C. Hydrogen peroxide was used as the<br />oxidizing agent. To identify functional groups on the surface of investigated charcoal samples<br />was used the Boehm method of titration with aqueous solutions of NaHCO3, Na2CO3, NaOH<br />and HCl. The results obtained are shown in the table.<br />Table 1: The quality and quantity of functional groups on the surface of intact charcoal and the<br />one oxidized with hydrogen peroxide</p><p>MS- intact charcoal; MOR- charcoal oxidized at cool; MOC-charcoal oxidized at room<br />temperature.<br />Analysis of the obtained results allows us to notice a substantial increase of acidic<br />functional groups for samples of oxidized charcoal as compared to intact charcoal and at the<br />same time, a decrease in alkaline groups. Given that the degree of retention of heavy metal ions<br />is directly proportional to the amount of acidic functional groups on the adsorbent surface, we<br />can assume that oxidized carbon materials will exhibit a higher level of immobilization of these<br />pollutants.<br />References:<br />[1] Lupaşcu, T. Activated carbon from vegetal raw materials. Monograph/ In Romanian L.: ÎEP:<br />Ştiinţa, Chişinău, 2004, 224 p.<br />[2] Lupaşcu, T. Tehnologii moderne de obtinere a carbunilor activi si utilizarea lor pentru<br />protectia mediului si a sanatatii omului. 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