Silica Derived from Burned Rice Hulls
Three new processes to obtain silica having high specific surface area from burned pre-treated rice hulls are presented and discussed. These procedures allow for the simultaneous recovery of biomass energy and the production of high quality silica at thermoelectric plants, without the risk of using...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
2002-10-01
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| Series: | Materials Research |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392002000400012 |
| _version_ | 1818948380392423424 |
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| author | M.F. de Souza W.L.E. Magalhães M.C. Persegil |
| author_facet | M.F. de Souza W.L.E. Magalhães M.C. Persegil |
| author_sort | M.F. de Souza |
| collection | DOAJ |
| description | Three new processes to obtain silica having high specific surface area from burned pre-treated rice hulls are presented and discussed. These procedures allow for the simultaneous recovery of biomass energy and the production of high quality silica at thermoelectric plants, without the risk of using corrosive substances in the burning process. The first method involves treatment of the hull with hot organic acid solutions before burning, the second with boiling water, both using an autoclave at temperatures close to150 °C, while the third method renders the hull fragile by treating it at 250 °C and reducing it to a fine powder before burning. The first two methods result in white amorphous silica that can show 500 m²/g of specific surface area. The third method, which does not remove the alkaline elements from the hull, produces an amorphous gray carbon-free powder whose specific surface area can be as high as 250 m²/g. An investigation of the specific surface area of the prepared silica indicates the alkaline elements are not mixed with silica in the hulls or combined as insoluble compounds. A comparison is made of these processes and the dissolution of silica by sodium hydroxide solutions is discussed. |
| first_indexed | 2024-12-20T08:45:53Z |
| format | Article |
| id | doaj.art-5f8c1abaf38b49cb86f18dc44459bffc |
| institution | Directory Open Access Journal |
| issn | 1516-1439 |
| language | English |
| last_indexed | 2024-12-20T08:45:53Z |
| publishDate | 2002-10-01 |
| publisher | Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) |
| record_format | Article |
| series | Materials Research |
| spelling | doaj.art-5f8c1abaf38b49cb86f18dc44459bffc2022-12-21T19:46:16ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-14392002-10-015446747410.1590/S1516-14392002000400012Silica Derived from Burned Rice HullsM.F. de SouzaW.L.E. MagalhãesM.C. PersegilThree new processes to obtain silica having high specific surface area from burned pre-treated rice hulls are presented and discussed. These procedures allow for the simultaneous recovery of biomass energy and the production of high quality silica at thermoelectric plants, without the risk of using corrosive substances in the burning process. The first method involves treatment of the hull with hot organic acid solutions before burning, the second with boiling water, both using an autoclave at temperatures close to150 °C, while the third method renders the hull fragile by treating it at 250 °C and reducing it to a fine powder before burning. The first two methods result in white amorphous silica that can show 500 m²/g of specific surface area. The third method, which does not remove the alkaline elements from the hull, produces an amorphous gray carbon-free powder whose specific surface area can be as high as 250 m²/g. An investigation of the specific surface area of the prepared silica indicates the alkaline elements are not mixed with silica in the hulls or combined as insoluble compounds. A comparison is made of these processes and the dissolution of silica by sodium hydroxide solutions is discussed.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392002000400012amorphous silicananosilicarice hullenergythermoelectric plants |
| spellingShingle | M.F. de Souza W.L.E. Magalhães M.C. Persegil Silica Derived from Burned Rice Hulls Materials Research amorphous silica nanosilica rice hull energy thermoelectric plants |
| title | Silica Derived from Burned Rice Hulls |
| title_full | Silica Derived from Burned Rice Hulls |
| title_fullStr | Silica Derived from Burned Rice Hulls |
| title_full_unstemmed | Silica Derived from Burned Rice Hulls |
| title_short | Silica Derived from Burned Rice Hulls |
| title_sort | silica derived from burned rice hulls |
| topic | amorphous silica nanosilica rice hull energy thermoelectric plants |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392002000400012 |
| work_keys_str_mv | AT mfdesouza silicaderivedfromburnedricehulls AT wlemagalhaes silicaderivedfromburnedricehulls AT mcpersegil silicaderivedfromburnedricehulls |