Academic Journal
Application of iron/aluminum bimetallic nanoparticle system for chromium-contaminated groundwater remediation
| العنوان: | Application of iron/aluminum bimetallic nanoparticle system for chromium-contaminated groundwater remediation |
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| المؤلفون: | Ou, Jiun-Hau, Sheu, Yih-Terng, Tsang, Daniel C.W., Sun, Yong-Jun, Kao, Chih-Ming |
| بيانات النشر: | Elsevier Ltd |
| سنة النشر: | 2020 |
| المجموعة: | The Hong Kong University of Science and Technology: HKUST Institutional Repository |
| مصطلحات موضوعية: | Bimetallic nanoparticle (BNP), Groundwater contamination, Hexavalent chromium (Cr 6+ ), Nanoscale zero valent iron (nZVI), Site remediations |
| الوصف: | When the nanoscale zero valent iron (nZVI) is used for the reduction of hexavalent chromium (Cr6+) to trivalent chromium (Cr3+) in groundwater, the reduction efficiency is decreased due to the passivation of reactive sites by precipitation. The bimetallic nanoparticle (BNP) can be created with the addition of the second metal to achieve a higher activity and reduce the occurrence of the ferrous/ferric hydroxide precipitation. In this study, the iron-coated aluminum (Fe/Al) BNP and aluminum-coated iron (Al/Fe) BNP systems were designed for remediating Cr6+-contaminated groundwater. The chemical liquid-phase deposition and co-reduction method was applied to produce BNPs. Cr6+ removal rate by Fe/Al BNPs was directly proportional to the saturation concentration and reactive sites, which caused a higher Cr6+ removal rate. The pseudo-first-order kinetic model could be used to describe the Cr6+ adsorption mechanism by Fe/Al BNPs. Results show that Fe/Al BNPs and Al/Fe BNPs could reduce Cr6+ to Cr3+, and the removal efficiencies for Cr6+ were 1.47 g/g BNP and 0.07 g/g BNP, respectively. Detection of Cr3+ in the aqueous phase was observed during the Cr6+ removal process. Results from X-ray diffraction (XRD) analysis confirmed that Cr(OH)3 was present on the surface of BNPs. Main mechanisms caused Cr6+ removal included reduction, precipitation, and adsorption. The reduction of Cr6+ produced OH−, which created alkaline environment and facilitated the formation of chromium hydroxide precipitates [Cr(OH)3]. Thus, the migration of Cr3+ was prevented and the environmental risk was reduced. BNP had a higher activity and stability, and it was applicable for Cr6+-contaminated site remediation. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 0045-6535 1879-1298 |
| Relation: | https://repository.hkust.edu.hk/ir/Record/1783.1-129123; Chemosphere, v. 256, October 2020, article number 127158; https://doi.org/10.1016/j.chemosphere.2020.127158; http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=0045-6535&rft.volume=&rft.issue=&rft.date=2020&rft.spage=&rft.aulast=Ou&rft.aufirst=Jiun-Hau&rft.atitle=Application+of+iron%2Faluminum+bimetallic+nanoparticle+system+for+chromium-contaminated+groundwater+remediation&rft.title=Chemosphere; http://www.scopus.com/record/display.url?eid=2-s2.0-85085323290&origin=inward; http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=LinksAMR&SrcApp=PARTNER_APP&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000540870300093 |
| DOI: | 10.1016/j.chemosphere.2020.127158 |
| الاتاحة: | https://repository.hkust.edu.hk/ir/Record/1783.1-129123 https://doi.org/10.1016/j.chemosphere.2020.127158 http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=0045-6535&rft.volume=&rft.issue=&rft.date=2020&rft.spage=&rft.aulast=Ou&rft.aufirst=Jiun-Hau&rft.atitle=Application+of+iron%2Faluminum+bimetallic+nanoparticle+system+for+chromium-contaminated+groundwater+remediation&rft.title=Chemosphere http://www.scopus.com/record/display.url?eid=2-s2.0-85085323290&origin=inward http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=LinksAMR&SrcApp=PARTNER_APP&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000540870300093 |
| رقم الانضمام: | edsbas.222564B6 |
| قاعدة البيانات: | BASE |
| تدمد: | 00456535 18791298 |
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| DOI: | 10.1016/j.chemosphere.2020.127158 |