Impacts of inherent o-containing functional groups on the surface properties of shengli lignite
Shengli (SL) lignite was thermally treated by heating at 200-350 C in an effort to reduce the number of O-containing functional groups and water present. The presence of carboxyl groups, phenolic hydroxyl groups, and methoxy groups was characterized using a chemical titration method. The moisture ho...
| Main Authors: | , , , , , |
|---|---|
| Format: | Journal Article |
| Published: |
American Chemical Society
2014
|
| Online Access: | http://hdl.handle.net/20.500.11937/55656 |
| _version_ | 1848759675686748160 |
|---|---|
| author | Wang, Y. Zhou, J. Bai, L. Chen, Y. Zhang, Shu Lin, X. |
| author_facet | Wang, Y. Zhou, J. Bai, L. Chen, Y. Zhang, Shu Lin, X. |
| author_sort | Wang, Y. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Shengli (SL) lignite was thermally treated by heating at 200-350 C in an effort to reduce the number of O-containing functional groups and water present. The presence of carboxyl groups, phenolic hydroxyl groups, and methoxy groups was characterized using a chemical titration method. The moisture holding capacity (MHC), wettability, and ? potential of the SL lignite were measured before and after the low-temperature heat treatment. The results revealed that the main reactions that occurred below 350 C were decarboxylation and dehydration, corresponding to the decomposition of more than 60% of the carboxyl groups and phenolic hydroxyl groups. SL lignite treated at 350 C displayed an approximately 50% reduction in its MHC. The O-containing functional groups (the carboxyl groups, in particular) played an important role in water adsorption, indicating that the formation of the hydrogen bond between the O-containing functional groups and water contributed most significantly to the water adsorption process. The contact angle decreased as the number of hydrophilic sites decreased as a result of the decomposition of O-containing functional groups. The ? potential of the SL lignite decreased significantly as the concentration of O-containing functional groups decreased. MHC was successfully correlated with the presence of O-containing functional groups and the quantity of surface area without oxygen groups, as follows: MHC = 2.655[-COOH] + 2.912[-OH] + 0.209[-OCH 3 ] - 3.321S non-O + 1.341, where S non-O for the lignite is defined as S non-O = S i (1 - C i /C 0 ), where S i is the surface area of the lignite and C i and C 0 are the total contents of O-containing functional groups in the heat-treatment or as-received lignites. © 2014 American Chemical Society. |
| first_indexed | 2025-11-14T10:03:39Z |
| format | Journal Article |
| id | curtin-20.500.11937-55656 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:03:39Z |
| publishDate | 2014 |
| publisher | American Chemical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-556562017-09-13T16:11:25Z Impacts of inherent o-containing functional groups on the surface properties of shengli lignite Wang, Y. Zhou, J. Bai, L. Chen, Y. Zhang, Shu Lin, X. Shengli (SL) lignite was thermally treated by heating at 200-350 C in an effort to reduce the number of O-containing functional groups and water present. The presence of carboxyl groups, phenolic hydroxyl groups, and methoxy groups was characterized using a chemical titration method. The moisture holding capacity (MHC), wettability, and ? potential of the SL lignite were measured before and after the low-temperature heat treatment. The results revealed that the main reactions that occurred below 350 C were decarboxylation and dehydration, corresponding to the decomposition of more than 60% of the carboxyl groups and phenolic hydroxyl groups. SL lignite treated at 350 C displayed an approximately 50% reduction in its MHC. The O-containing functional groups (the carboxyl groups, in particular) played an important role in water adsorption, indicating that the formation of the hydrogen bond between the O-containing functional groups and water contributed most significantly to the water adsorption process. The contact angle decreased as the number of hydrophilic sites decreased as a result of the decomposition of O-containing functional groups. The ? potential of the SL lignite decreased significantly as the concentration of O-containing functional groups decreased. MHC was successfully correlated with the presence of O-containing functional groups and the quantity of surface area without oxygen groups, as follows: MHC = 2.655[-COOH] + 2.912[-OH] + 0.209[-OCH 3 ] - 3.321S non-O + 1.341, where S non-O for the lignite is defined as S non-O = S i (1 - C i /C 0 ), where S i is the surface area of the lignite and C i and C 0 are the total contents of O-containing functional groups in the heat-treatment or as-received lignites. © 2014 American Chemical Society. 2014 Journal Article http://hdl.handle.net/20.500.11937/55656 10.1021/ef402004j American Chemical Society restricted |
| spellingShingle | Wang, Y. Zhou, J. Bai, L. Chen, Y. Zhang, Shu Lin, X. Impacts of inherent o-containing functional groups on the surface properties of shengli lignite |
| title | Impacts of inherent o-containing functional groups on the surface properties of shengli lignite |
| title_full | Impacts of inherent o-containing functional groups on the surface properties of shengli lignite |
| title_fullStr | Impacts of inherent o-containing functional groups on the surface properties of shengli lignite |
| title_full_unstemmed | Impacts of inherent o-containing functional groups on the surface properties of shengli lignite |
| title_short | Impacts of inherent o-containing functional groups on the surface properties of shengli lignite |
| title_sort | impacts of inherent o-containing functional groups on the surface properties of shengli lignite |
| url | http://hdl.handle.net/20.500.11937/55656 |