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![]() NASTAS, Raisa, GOREACIOC (ARAPU), Tatiana, LUPASCU, Tudor, SANDU, Maria, RUSU, Vasile. Surface chemistry characteristics of active carbons AG-5 and AG-5ox. 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. 160. |
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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. 160-160 | ||||||
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Many applications of carbonaceous adsorbents are strongly influenced by their surface The FTIR spectral analysis is an important tool to identify some characteristic functional groups |
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Cerif XML Export
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The characterization of surface oxygen groups is very often done by chemical or<br />spectroscopic methods such as acid-base titration, FTIR, TPD, XPS etc. The aim of this work<br />was to modify the surface chemistry of the commercial granular active carbon AG-5, using as<br />oxidizing agent concentrated nitric acid. The surface chemistry characteristics of unmodified<br />(AG-5) and oxidized (AG-5ox) active carbon samples were evaluated by using the Boehm<br />titration method, pH of carbon suspension and IR spectral analysis.<br />The results of Boehm’s titration method and pH value of the carbon surface are given in Table 1.<br />Significant differences existed on the amount of acidic and basic functional groups of the active<br />carbons. After oxidation process the amount of total acidic groups (titrated with NaOH) on active<br />carbon surface AG-5ox increases by about 6 times in comparison with initial sample AG-5. The<br />concentration of the acidic groups on the oxidized active carbon surface AG-5ox followed the<br />order weak acidic > strong acidic > phenolic.<br />Table1. Surface chemistry of carbons evaluated by Boehm method and pH of suspension.</p><p>The FTIR spectral analysis is an important tool to identify some characteristic functional groups<br />on the active carbons surface. Bands in the 1000-1200 cm-1 region are difficult to assign because<br />there is a superposition of a number of broad overlapping bands. They could be assigned to C-O<br />as in phenols/ethers/esters (1200 cm). The shoulder at 1164 cm-1 together with two absorptions<br />of low intensity (1385 and 1399 cm-1), confirm the presence of phenolic groups on the oxidized<br />active carbon surface (AG-5ox). The bands in the region of 1500-1600 cm, presented in the<br />spectrum of AG-5ox at 1521, 1562 and 1625 cm-1, and in the spectrum of AG-5 at 1490 and<br />1560 cm-1, can be assigned to aromatic ring stretching (C=C) coupled to highly conjugated<br />carbonyl groups (C=O). The band between 1700 and 1730 cm-1, that can be assigned to the<br />stretching vibration of C=O bonds, characteristic of carboxylic, ketone and aldehyde groups, is<br />much higher in AG-5ox than in AG-5 spectrum.<br />Generally, both used methods to quantify the surface characteristic groups on active<br />carbon samples show an increase of acidic surface groups on oxidized sample, presented as<br />strong acidic – carboxylic groups, weak acidic – ketones and aldehyde groups, and phenolic<br />groups.</p></cfAbstr> <cfResPubl_Class> <cfClassId>eda2d9e9-34c5-11e1-b86c-0800200c9a66</cfClassId> <cfClassSchemeId>759af938-34ae-11e1-b86c-0800200c9a66</cfClassSchemeId> <cfStartDate>2014T24:00:00</cfStartDate> </cfResPubl_Class> <cfResPubl_Class> <cfClassId>e601872f-4b7e-4d88-929f-7df027b226c9</cfClassId> <cfClassSchemeId>40e90e2f-446d-460a-98e5-5dce57550c48</cfClassSchemeId> <cfStartDate>2014T24:00:00</cfStartDate> </cfResPubl_Class> <cfPers_ResPubl> <cfPersId>ibn-person-12153</cfPersId> <cfClassId>49815870-1cfe-11e1-8bc2-0800200c9a66</cfClassId> <cfClassSchemeId>b7135ad0-1d00-11e1-8bc2-0800200c9a66</cfClassSchemeId> <cfStartDate>2014T24:00:00</cfStartDate> </cfPers_ResPubl> <cfPers_ResPubl> <cfPersId>ibn-person-12328</cfPersId> <cfClassId>49815870-1cfe-11e1-8bc2-0800200c9a66</cfClassId> <cfClassSchemeId>b7135ad0-1d00-11e1-8bc2-0800200c9a66</cfClassSchemeId> <cfStartDate>2014T24:00:00</cfStartDate> </cfPers_ResPubl> <cfPers_ResPubl> <cfPersId>ibn-person-679</cfPersId> <cfClassId>49815870-1cfe-11e1-8bc2-0800200c9a66</cfClassId> <cfClassSchemeId>b7135ad0-1d00-11e1-8bc2-0800200c9a66</cfClassSchemeId> <cfStartDate>2014T24:00:00</cfStartDate> </cfPers_ResPubl> <cfPers_ResPubl> <cfPersId>ibn-person-559</cfPersId> <cfClassId>49815870-1cfe-11e1-8bc2-0800200c9a66</cfClassId> <cfClassSchemeId>b7135ad0-1d00-11e1-8bc2-0800200c9a66</cfClassSchemeId> <cfStartDate>2014T24:00:00</cfStartDate> </cfPers_ResPubl> <cfPers_ResPubl> <cfPersId>ibn-person-12209</cfPersId> <cfClassId>49815870-1cfe-11e1-8bc2-0800200c9a66</cfClassId> <cfClassSchemeId>b7135ad0-1d00-11e1-8bc2-0800200c9a66</cfClassSchemeId> <cfStartDate>2014T24:00:00</cfStartDate> </cfPers_ResPubl> </cfResPubl> <cfPers> <cfPersId>ibn-Pers-12153</cfPersId> <cfPersName_Pers> <cfPersNameId>ibn-PersName-12153-3</cfPersNameId> <cfClassId>55f90543-d631-42eb-8d47-d8d9266cbb26</cfClassId> <cfClassSchemeId>7375609d-cfa6-45ce-a803-75de69abe21f</cfClassSchemeId> <cfStartDate>2014T24:00:00</cfStartDate> <cfFamilyNames>Nastas</cfFamilyNames> <cfFirstNames>Raisa</cfFirstNames> </cfPersName_Pers> </cfPers> <cfPers> <cfPersId>ibn-Pers-12328</cfPersId> <cfPersName_Pers> <cfPersNameId>ibn-PersName-12328-3</cfPersNameId> <cfClassId>55f90543-d631-42eb-8d47-d8d9266cbb26</cfClassId> <cfClassSchemeId>7375609d-cfa6-45ce-a803-75de69abe21f</cfClassSchemeId> <cfStartDate>2014T24:00:00</cfStartDate> <cfFamilyNames>Goreacioc (Arapu)</cfFamilyNames> <cfFirstNames>Tatiana</cfFirstNames> </cfPersName_Pers> </cfPers> <cfPers> <cfPersId>ibn-Pers-679</cfPersId> <cfPersName_Pers> <cfPersNameId>ibn-PersName-679-3</cfPersNameId> <cfClassId>55f90543-d631-42eb-8d47-d8d9266cbb26</cfClassId> <cfClassSchemeId>7375609d-cfa6-45ce-a803-75de69abe21f</cfClassSchemeId> <cfStartDate>2014T24:00:00</cfStartDate> <cfFamilyNames>Lupascu</cfFamilyNames> <cfFirstNames>Tudor</cfFirstNames> </cfPersName_Pers> </cfPers> <cfPers> <cfPersId>ibn-Pers-559</cfPersId> <cfPersName_Pers> <cfPersNameId>ibn-PersName-559-3</cfPersNameId> <cfClassId>55f90543-d631-42eb-8d47-d8d9266cbb26</cfClassId> <cfClassSchemeId>7375609d-cfa6-45ce-a803-75de69abe21f</cfClassSchemeId> <cfStartDate>2014T24:00:00</cfStartDate> <cfFamilyNames>Sandu</cfFamilyNames> <cfFirstNames>Maria</cfFirstNames> </cfPersName_Pers> </cfPers> <cfPers> <cfPersId>ibn-Pers-12209</cfPersId> <cfPersName_Pers> <cfPersNameId>ibn-PersName-12209-3</cfPersNameId> <cfClassId>55f90543-d631-42eb-8d47-d8d9266cbb26</cfClassId> <cfClassSchemeId>7375609d-cfa6-45ce-a803-75de69abe21f</cfClassSchemeId> <cfStartDate>2014T24:00:00</cfStartDate> <cfFamilyNames>Rusu</cfFamilyNames> <cfFirstNames>Vasile</cfFirstNames> </cfPersName_Pers> </cfPers> </CERIF>