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Stabilization of Cr(VI) from fine ferrochrome dust using exfoliated vermiculite
Dissertation (MSc)--University of Pretoria, 2011.
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University of Pretoria
2013
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| _version_ | 1867613459457245184 |
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| access_status_str | Open Access |
| author2 | Garbers-Craig, Andrie Mariana |
| author_browse | Garbers-Craig, Andrie Mariana |
| author_facet | Garbers-Craig, Andrie Mariana |
| collection | Thesis |
| dc_rights_str_mv | © 2011, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MSc)--University of Pretoria, 2011. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/28532 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:36:29.146Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/28532 Stabilization of Cr(VI) from fine ferrochrome dust using exfoliated vermiculite Garbers-Craig, Andrie Mariana delmulange@gmail.com Mulange wa Mulange, Delphin Ferrochrome Adsorption Chromium (vi) Vermiculite Isotherms UCTD Dissertation (MSc)--University of Pretoria, 2011. It was been reported that untreated wastes from ferrochrome plants release heavy metals including lead, chromium, copper, cadmium, zinc and nickel in the environment. Some of these metals such as hexavalent chromium are potentially toxic and carcinogenic, and can cause a serious threat to human health. The contamination of terrestrial and aquatic ecosystems by hexavalent chromium is worldwide of major environmental concern, especially in South Africa which is the largest producer of chromite and ferrochrome. Therefore, the pre-treatment of these wastes before landfill is of great importance to prevent the contamination of the ecosystems. In the present study, vermiculite, a natural occurring mineral, has been tested for its adsorption effectiveness in removing Cr(VI) from ferrochrome dust leachate. Batch adsorption studies have been carried out to determine the effect of pH, contact time and adsorbent dose on the removal of Cr(VI). The process was found to be highly pH dependent. The optimum conditions for the removal were found to be at pH 1.5, contact time 2 hours and adsorbent dose 10 g.L-1. According to kinetic and isotherm studies, the process is best fitted by the pseudo-second order kinetic model, and to both Langmuir and Freundlich isotherms. The maximum adsorption capacity was found to be 23.25 mg.g-1. Thermodynamic parameters show the spontaneous and endothermic nature of Cr(VI) adsorption onto vermiculite. Materials Science and Metallurgical Engineering unrestricted 2013-09-07T13:40:51Z 2011-10-18 2013-09-07T13:40:51Z 2011-09-06 2011-10-18 2011-10-07 Dissertation Mulange wa Mulange, D 2011, Stabilization of Cr(VI) from fine ferrochrome dust using exfoliated vermiculite, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/28532 > E11/9/211/gm http://hdl.handle.net/2263/28532 http://upetd.up.ac.za/thesis/available/etd-10072011-164253/ © 2011, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | Ferrochrome Adsorption Chromium (vi) Vermiculite Isotherms UCTD Stabilization of Cr(VI) from fine ferrochrome dust using exfoliated vermiculite |
| title | Stabilization of Cr(VI) from fine ferrochrome dust using exfoliated vermiculite |
| title_full | Stabilization of Cr(VI) from fine ferrochrome dust using exfoliated vermiculite |
| title_fullStr | Stabilization of Cr(VI) from fine ferrochrome dust using exfoliated vermiculite |
| title_full_unstemmed | Stabilization of Cr(VI) from fine ferrochrome dust using exfoliated vermiculite |
| title_short | Stabilization of Cr(VI) from fine ferrochrome dust using exfoliated vermiculite |
| title_sort | stabilization of cr vi from fine ferrochrome dust using exfoliated vermiculite |
| topic | Ferrochrome Adsorption Chromium (vi) Vermiculite Isotherms UCTD |
| url | http://hdl.handle.net/2263/28532 http://upetd.up.ac.za/thesis/available/etd-10072011-164253/ |