Scholars' Mine
Missouri S&T
Research Repository
Curtis Laws Wilson Library
400 W. 14th Street
Rolla, MO 65409-0060
scholarsmine@mst.edu
| Title: | Sol-gel materials for high capacity, rapid removal of metal contaminants |
| Author (s): | Heckman, B. Martin, L. Bertino, Massimo Leventis, Nicholas Tokuhiro, Akira |
| Department/Lab Affiliations: | Chemistry |
| Keywords: | environmental remediation nuclear waste precipitation sol-gel |
| Subject Terms: | Porous materials. |
| Issue Date: | 2007 |
| Publisher: | Taylor & Francis |
| Citation: | Bertino, M.F., Leventis, N., Tokuhiro, A.T., Heckman, B., and Martin, L. Sol-gel Materials for High Capacity, Rapid Removal of Metal Contaminants, Separation Science and Technology , Vol. 43(6), 2008, pp. 1474-1487, 2007. |
| Abstract: | An environmental waste remediation method is presented where porous cylindrical monoliths are interposed as septa between a solution contaminated with metal ions and a solution of a precipitant. Precipitant and contaminant diffuse and generate precipitate nano- and micro-particles inside the monoliths. Two types of silica sol-gel monoliths were tested. One class of materials was prepared following a conventional base-catalyzed route which yielded fragile silica monoliths with pore diameters on the order of 7-10 nm. A second class of materials material consisted of templated silica macroporous monoliths that were cross-linked with diisocyanate. These materials had pore diameters on the order of microns and were mechanically extremely strong, having a Young modulus in excess of 400 MPa. Both types of silica gel monoliths proved very versatile, and allowed to precipitate a wide variety of metal ions, including toxic metals such as Cd2+, and fission by-products such as lanthanides and Sr2+. The capacity of the gel monoliths was also very high, at least 20 times higher than the capacity of conventional derivatized gels. Most importantly, precipitation inside the macroporous gels was a factor 7-8 more rapid than in microporous gels. The results indicate that macroporous cross-linked sol-gel monoliths are a promising material for the development of efficient, mechanically strong filter elements for environmental remediation. |
| Type: | Article - Journal text |
| In Title: | Separation Science and Technology |
| Copyright Notice: | Pre-print: author can archive; Post-print: author can archive with restrictions;Restriction: 12 month embargo for STM Journals;18 month embargo for SSH journals; Conditions: Some individual journals may have policies prohibiting pre-print archiving;Publisher's version/PDF cannot be used;On a non-profit server;Published source must be acknowledged;Must link to publisher version; This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. FULL COPYRIGHT INFORMATION: |
| Publisher URL: | |
| Link to this page: |
| title | Sol-gel materials for high capacity, rapid removal of metal contaminants |
| contributor.author | Heckman, B. |
| contributor.author | Martin, L. |
| contributor.author | Bertino, Massimo |
| contributor.author | Leventis, Nicholas |
| contributor.author | Tokuhiro, Akira |
| contributor.deptlab | Chemistry |
| subject | environmental remediation |
| subject | nuclear waste |
| subject | precipitation |
| subject | sol-gel |
| subject.LCSH | Porous materials. |
| date.issued | 2007 |
| publisher | Taylor & Francis |
| identifier.citation | Bertino, M.F., Leventis, N., Tokuhiro, A.T., Heckman, B., and Martin, L. Sol-gel Materials for High Capacity, Rapid Removal of Metal Contaminants, Separation Science and Technology , Vol. 43(6), 2008, pp. 1474-1487, 2007. |
| identifier.pub.URI | |
| description.abstract | An environmental waste remediation method is presented where porous cylindrical monoliths are interposed as septa between a solution contaminated with metal ions and a solution of a precipitant. Precipitant and contaminant diffuse and generate precipitate nano- and micro-particles inside the monoliths. Two types of silica sol-gel monoliths were tested. One class of materials was prepared following a conventional base-catalyzed route which yielded fragile silica monoliths with pore diameters on the order of 7-10 nm. A second class of materials material consisted of templated silica macroporous monoliths that were cross-linked with diisocyanate. These materials had pore diameters on the order of microns and were mechanically extremely strong, having a Young modulus in excess of 400 MPa. Both types of silica gel monoliths proved very versatile, and allowed to precipitate a wide variety of metal ions, including toxic metals such as Cd2+, and fission by-products such as lanthanides and Sr2+. The capacity of the gel monoliths was also very high, at least 20 times higher than the capacity of conventional derivatized gels. Most importantly, precipitation inside the macroporous gels was a factor 7-8 more rapid than in microporous gels. The results indicate that macroporous cross-linked sol-gel monoliths are a promising material for the development of efficient, mechanically strong filter elements for environmental remediation. |
| type | Article - Journal |
| type.DCMIType | text |
| type.status | Postprint |
| rights | Pre-print: author can archive; Post-print: author can archive with restrictions;Restriction: 12 month embargo for STM Journals;18 month embargo for SSH journals; Conditions: Some individual journals may have policies prohibiting pre-print archiving;Publisher's version/PDF cannot be used;On a non-profit server;Published source must be acknowledged;Must link to publisher version; |
| rights | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. |
| rights.URI | |
| relation.isPartOf | Separation Science and Technology |
| date.available | 2008-06-13T19:21:14Z |
| identifier.persist.URI |