One-step synthesis and characterization of core–shell Fe@SiO2 nanocomposite for Cr (VI) reduction
A facile one-step method was developed to fabricate mono-dispersed Fe nanoparticles (Fe NPs) coated with SiO2 shell by aqueous reduction method combined with modified Stöber method. Borohydride was acted not only as a reductant for iron salt but also as a catalyst for hydrolysis and polycondensation...
Gespeichert in:
| Veröffentlicht in: | The Science of the total environment 2012-04, Vol.421-422, p.260-266 |
|---|---|
| Hauptverfasser: | , , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| container_end_page | 266 |
|---|---|
| container_issue | |
| container_start_page | 260 |
| container_title | The Science of the total environment |
| container_volume | 421-422 |
| creator | Li, Yongchao Jin, Zhaohui Li, Tielong Xiu, Zongming |
| description | A facile one-step method was developed to fabricate mono-dispersed Fe nanoparticles (Fe NPs) coated with SiO2 shell by aqueous reduction method combined with modified Stöber method. Borohydride was acted not only as a reductant for iron salt but also as a catalyst for hydrolysis and polycondensation reaction of tetraethylorthosilicate (TEOS), and more importantly, there was no need to use surface primer for the generation of Fe NPs and catalyst NH4OH for SiO2. Both the Fe NPs agglomeration and SiO2 shell thickness can be controlled through the synthetic conditions. Lower potassium borohydride (KBH4) injection speed was preferable to assemble Fe NPs. The SiO2 shell thickness increased gradually with the increase of TEOS amount. Under the condition of TEOS amount of 0.1mL and KBH4 injection speed of 5mL/min, 25nm single Fe NP was coated with SiO2 shell with thickness of about 9nm. The resulting nanoporous SiO2 shell was proved to allow reactant to reach the Fe NPs while at the same time protect them from aggregation. The reactivity characterization of the SiO2-coated Fe nanoparticles (Fe@SiO2) showed that both TEOS concentration and KBH4 injection speed had effect on Cr (VI) degradation ability. The highest removal capacity of Fe@SiO2 can reach 467mgCr/gFe at an initial Cr (VI) concentration of 70mg/L under pH 6.0±0.1. XPS and TEM results showed that Cr (VI) was converted to nontoxic Cr (III) and the reaction product was completely adsorbed to SiO2 shell.
► We prepare, characterize monodispersed core–shell Fe@SiO2 nanocomposites, then use them for Cr (VI) reduction. ► The facile one-step synthesis method excludes using surface primer for Fe NPs and catalyst NH4OH for SiO2 generation. ► Nanoporous SiO2 shell permit reactant to reach the Fe NPs while at the same time protected them from aggregation. ► Under the optical condition, 25nm single Fe NP was homogeneously coated with a 9nm SiO2 shell. ► Removal capacity of Fe@SiO2 can reach 467mgCr/gFe which was much higher than that of reported zerovalent iron particles. |
| doi_str_mv | 10.1016/j.scitotenv.2012.01.010 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_928910945</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><els_id>S0048969712000125</els_id><sourcerecordid>928910945</sourcerecordid><originalsourceid>FETCH-LOGICAL-c366t-1693441794d9408b0e56be93501b490c4b29a4a925debb10c900c36cfaace1483</originalsourceid><addsrcrecordid>eNqFkE1OIzEQhS3ECELgCuAdw6IzZbfT3d6BouFHipTFDGwtt7tacZTYwXYiwYo7cMM5CY4CbKf0pNp8r34eIRcMRgxY9WsxisYmn9BtRxwYHwHLggMyYE0tCwa8OiQDANEUspL1MTmJcQG56oYdkWPOyyYzzYCYmcMiJlzT-OLSHKONVLuOmrkO2iQM9lUn6x31PTU-4L-39zjH5ZLe4vUfO-PUaeeNX619tAlp7wOdBPrz6eGKBuw2Zuc9JT96vYx49tmH5PH299_JfTGd3T1MbqaFKasqFaySpRCslqKTApoWcFy1KMsxsFZIMKLlUgst-bjDtmVgJEB2ml5rg0w05ZBc7ueug3_eYExqZaPJx2qHfhOV5I1kIMU4k_WeNMHHGLBX62BXOrwoBmoXsFqo74DVLmAFLAuy8_xzx6ZdYfft-0o0Azd7APOnW4thNwidwc4GNEl13v53yQendJHN</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>928910945</pqid></control><display><type>article</type><title>One-step synthesis and characterization of core–shell Fe@SiO2 nanocomposite for Cr (VI) reduction</title><source>MEDLINE</source><source>Elsevier ScienceDirect Journals</source><creator>Li, Yongchao ; Jin, Zhaohui ; Li, Tielong ; Xiu, Zongming</creator><creatorcontrib>Li, Yongchao ; Jin, Zhaohui ; Li, Tielong ; Xiu, Zongming</creatorcontrib><description>A facile one-step method was developed to fabricate mono-dispersed Fe nanoparticles (Fe NPs) coated with SiO2 shell by aqueous reduction method combined with modified Stöber method. Borohydride was acted not only as a reductant for iron salt but also as a catalyst for hydrolysis and polycondensation reaction of tetraethylorthosilicate (TEOS), and more importantly, there was no need to use surface primer for the generation of Fe NPs and catalyst NH4OH for SiO2. Both the Fe NPs agglomeration and SiO2 shell thickness can be controlled through the synthetic conditions. Lower potassium borohydride (KBH4) injection speed was preferable to assemble Fe NPs. The SiO2 shell thickness increased gradually with the increase of TEOS amount. Under the condition of TEOS amount of 0.1mL and KBH4 injection speed of 5mL/min, 25nm single Fe NP was coated with SiO2 shell with thickness of about 9nm. The resulting nanoporous SiO2 shell was proved to allow reactant to reach the Fe NPs while at the same time protect them from aggregation. The reactivity characterization of the SiO2-coated Fe nanoparticles (Fe@SiO2) showed that both TEOS concentration and KBH4 injection speed had effect on Cr (VI) degradation ability. The highest removal capacity of Fe@SiO2 can reach 467mgCr/gFe at an initial Cr (VI) concentration of 70mg/L under pH 6.0±0.1. XPS and TEM results showed that Cr (VI) was converted to nontoxic Cr (III) and the reaction product was completely adsorbed to SiO2 shell.
► We prepare, characterize monodispersed core–shell Fe@SiO2 nanocomposites, then use them for Cr (VI) reduction. ► The facile one-step synthesis method excludes using surface primer for Fe NPs and catalyst NH4OH for SiO2 generation. ► Nanoporous SiO2 shell permit reactant to reach the Fe NPs while at the same time protected them from aggregation. ► Under the optical condition, 25nm single Fe NP was homogeneously coated with a 9nm SiO2 shell. ► Removal capacity of Fe@SiO2 can reach 467mgCr/gFe which was much higher than that of reported zerovalent iron particles.</description><identifier>ISSN: 0048-9697</identifier><identifier>EISSN: 1879-1026</identifier><identifier>DOI: 10.1016/j.scitotenv.2012.01.010</identifier><identifier>PMID: 22381028</identifier><language>eng</language><publisher>Netherlands: Elsevier B.V</publisher><subject>Chemistry Techniques, Synthetic - methods ; Chromium - chemistry ; Chromium - isolation & purification ; Core–shell ; Cr (VI) reduction ; Environmental Pollutants - chemistry ; Environmental Pollutants - isolation & purification ; Environmental Restoration and Remediation - methods ; Fe nanoparticles ; Iron - chemistry ; Metal Nanoparticles - chemistry ; Microscopy, Electron, Transmission ; One-step synthesis ; Oxidation-Reduction ; Particle Size ; Silicon Dioxide - chemistry ; SiO2 coating ; Spectrophotometry, Atomic ; Surface Properties ; X-Ray Diffraction</subject><ispartof>The Science of the total environment, 2012-04, Vol.421-422, p.260-266</ispartof><rights>2012 Elsevier B.V.</rights><rights>Copyright © 2012 Elsevier B.V. All rights reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c366t-1693441794d9408b0e56be93501b490c4b29a4a925debb10c900c36cfaace1483</citedby><cites>FETCH-LOGICAL-c366t-1693441794d9408b0e56be93501b490c4b29a4a925debb10c900c36cfaace1483</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.scitotenv.2012.01.010$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,778,782,3539,27907,27908,45978</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/22381028$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Li, Yongchao</creatorcontrib><creatorcontrib>Jin, Zhaohui</creatorcontrib><creatorcontrib>Li, Tielong</creatorcontrib><creatorcontrib>Xiu, Zongming</creatorcontrib><title>One-step synthesis and characterization of core–shell Fe@SiO2 nanocomposite for Cr (VI) reduction</title><title>The Science of the total environment</title><addtitle>Sci Total Environ</addtitle><description>A facile one-step method was developed to fabricate mono-dispersed Fe nanoparticles (Fe NPs) coated with SiO2 shell by aqueous reduction method combined with modified Stöber method. Borohydride was acted not only as a reductant for iron salt but also as a catalyst for hydrolysis and polycondensation reaction of tetraethylorthosilicate (TEOS), and more importantly, there was no need to use surface primer for the generation of Fe NPs and catalyst NH4OH for SiO2. Both the Fe NPs agglomeration and SiO2 shell thickness can be controlled through the synthetic conditions. Lower potassium borohydride (KBH4) injection speed was preferable to assemble Fe NPs. The SiO2 shell thickness increased gradually with the increase of TEOS amount. Under the condition of TEOS amount of 0.1mL and KBH4 injection speed of 5mL/min, 25nm single Fe NP was coated with SiO2 shell with thickness of about 9nm. The resulting nanoporous SiO2 shell was proved to allow reactant to reach the Fe NPs while at the same time protect them from aggregation. The reactivity characterization of the SiO2-coated Fe nanoparticles (Fe@SiO2) showed that both TEOS concentration and KBH4 injection speed had effect on Cr (VI) degradation ability. The highest removal capacity of Fe@SiO2 can reach 467mgCr/gFe at an initial Cr (VI) concentration of 70mg/L under pH 6.0±0.1. XPS and TEM results showed that Cr (VI) was converted to nontoxic Cr (III) and the reaction product was completely adsorbed to SiO2 shell.
► We prepare, characterize monodispersed core–shell Fe@SiO2 nanocomposites, then use them for Cr (VI) reduction. ► The facile one-step synthesis method excludes using surface primer for Fe NPs and catalyst NH4OH for SiO2 generation. ► Nanoporous SiO2 shell permit reactant to reach the Fe NPs while at the same time protected them from aggregation. ► Under the optical condition, 25nm single Fe NP was homogeneously coated with a 9nm SiO2 shell. ► Removal capacity of Fe@SiO2 can reach 467mgCr/gFe which was much higher than that of reported zerovalent iron particles.</description><subject>Chemistry Techniques, Synthetic - methods</subject><subject>Chromium - chemistry</subject><subject>Chromium - isolation & purification</subject><subject>Core–shell</subject><subject>Cr (VI) reduction</subject><subject>Environmental Pollutants - chemistry</subject><subject>Environmental Pollutants - isolation & purification</subject><subject>Environmental Restoration and Remediation - methods</subject><subject>Fe nanoparticles</subject><subject>Iron - chemistry</subject><subject>Metal Nanoparticles - chemistry</subject><subject>Microscopy, Electron, Transmission</subject><subject>One-step synthesis</subject><subject>Oxidation-Reduction</subject><subject>Particle Size</subject><subject>Silicon Dioxide - chemistry</subject><subject>SiO2 coating</subject><subject>Spectrophotometry, Atomic</subject><subject>Surface Properties</subject><subject>X-Ray Diffraction</subject><issn>0048-9697</issn><issn>1879-1026</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkE1OIzEQhS3ECELgCuAdw6IzZbfT3d6BouFHipTFDGwtt7tacZTYwXYiwYo7cMM5CY4CbKf0pNp8r34eIRcMRgxY9WsxisYmn9BtRxwYHwHLggMyYE0tCwa8OiQDANEUspL1MTmJcQG56oYdkWPOyyYzzYCYmcMiJlzT-OLSHKONVLuOmrkO2iQM9lUn6x31PTU-4L-39zjH5ZLe4vUfO-PUaeeNX619tAlp7wOdBPrz6eGKBuw2Zuc9JT96vYx49tmH5PH299_JfTGd3T1MbqaFKasqFaySpRCslqKTApoWcFy1KMsxsFZIMKLlUgst-bjDtmVgJEB2ml5rg0w05ZBc7ueug3_eYExqZaPJx2qHfhOV5I1kIMU4k_WeNMHHGLBX62BXOrwoBmoXsFqo74DVLmAFLAuy8_xzx6ZdYfft-0o0Azd7APOnW4thNwidwc4GNEl13v53yQendJHN</recordid><startdate>20120401</startdate><enddate>20120401</enddate><creator>Li, Yongchao</creator><creator>Jin, Zhaohui</creator><creator>Li, Tielong</creator><creator>Xiu, Zongming</creator><general>Elsevier B.V</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20120401</creationdate><title>One-step synthesis and characterization of core–shell Fe@SiO2 nanocomposite for Cr (VI) reduction</title><author>Li, Yongchao ; Jin, Zhaohui ; Li, Tielong ; Xiu, Zongming</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c366t-1693441794d9408b0e56be93501b490c4b29a4a925debb10c900c36cfaace1483</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Chemistry Techniques, Synthetic - methods</topic><topic>Chromium - chemistry</topic><topic>Chromium - isolation & purification</topic><topic>Core–shell</topic><topic>Cr (VI) reduction</topic><topic>Environmental Pollutants - chemistry</topic><topic>Environmental Pollutants - isolation & purification</topic><topic>Environmental Restoration and Remediation - methods</topic><topic>Fe nanoparticles</topic><topic>Iron - chemistry</topic><topic>Metal Nanoparticles - chemistry</topic><topic>Microscopy, Electron, Transmission</topic><topic>One-step synthesis</topic><topic>Oxidation-Reduction</topic><topic>Particle Size</topic><topic>Silicon Dioxide - chemistry</topic><topic>SiO2 coating</topic><topic>Spectrophotometry, Atomic</topic><topic>Surface Properties</topic><topic>X-Ray Diffraction</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Li, Yongchao</creatorcontrib><creatorcontrib>Jin, Zhaohui</creatorcontrib><creatorcontrib>Li, Tielong</creatorcontrib><creatorcontrib>Xiu, Zongming</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>The Science of the total environment</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Li, Yongchao</au><au>Jin, Zhaohui</au><au>Li, Tielong</au><au>Xiu, Zongming</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>One-step synthesis and characterization of core–shell Fe@SiO2 nanocomposite for Cr (VI) reduction</atitle><jtitle>The Science of the total environment</jtitle><addtitle>Sci Total Environ</addtitle><date>2012-04-01</date><risdate>2012</risdate><volume>421-422</volume><spage>260</spage><epage>266</epage><pages>260-266</pages><issn>0048-9697</issn><eissn>1879-1026</eissn><abstract>A facile one-step method was developed to fabricate mono-dispersed Fe nanoparticles (Fe NPs) coated with SiO2 shell by aqueous reduction method combined with modified Stöber method. Borohydride was acted not only as a reductant for iron salt but also as a catalyst for hydrolysis and polycondensation reaction of tetraethylorthosilicate (TEOS), and more importantly, there was no need to use surface primer for the generation of Fe NPs and catalyst NH4OH for SiO2. Both the Fe NPs agglomeration and SiO2 shell thickness can be controlled through the synthetic conditions. Lower potassium borohydride (KBH4) injection speed was preferable to assemble Fe NPs. The SiO2 shell thickness increased gradually with the increase of TEOS amount. Under the condition of TEOS amount of 0.1mL and KBH4 injection speed of 5mL/min, 25nm single Fe NP was coated with SiO2 shell with thickness of about 9nm. The resulting nanoporous SiO2 shell was proved to allow reactant to reach the Fe NPs while at the same time protect them from aggregation. The reactivity characterization of the SiO2-coated Fe nanoparticles (Fe@SiO2) showed that both TEOS concentration and KBH4 injection speed had effect on Cr (VI) degradation ability. The highest removal capacity of Fe@SiO2 can reach 467mgCr/gFe at an initial Cr (VI) concentration of 70mg/L under pH 6.0±0.1. XPS and TEM results showed that Cr (VI) was converted to nontoxic Cr (III) and the reaction product was completely adsorbed to SiO2 shell.
► We prepare, characterize monodispersed core–shell Fe@SiO2 nanocomposites, then use them for Cr (VI) reduction. ► The facile one-step synthesis method excludes using surface primer for Fe NPs and catalyst NH4OH for SiO2 generation. ► Nanoporous SiO2 shell permit reactant to reach the Fe NPs while at the same time protected them from aggregation. ► Under the optical condition, 25nm single Fe NP was homogeneously coated with a 9nm SiO2 shell. ► Removal capacity of Fe@SiO2 can reach 467mgCr/gFe which was much higher than that of reported zerovalent iron particles.</abstract><cop>Netherlands</cop><pub>Elsevier B.V</pub><pmid>22381028</pmid><doi>10.1016/j.scitotenv.2012.01.010</doi><tpages>7</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0048-9697 |
| ispartof | The Science of the total environment, 2012-04, Vol.421-422, p.260-266 |
| issn | 0048-9697 1879-1026 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_928910945 |
| source | MEDLINE; Elsevier ScienceDirect Journals |
| subjects | Chemistry Techniques, Synthetic - methods Chromium - chemistry Chromium - isolation & purification Core–shell Cr (VI) reduction Environmental Pollutants - chemistry Environmental Pollutants - isolation & purification Environmental Restoration and Remediation - methods Fe nanoparticles Iron - chemistry Metal Nanoparticles - chemistry Microscopy, Electron, Transmission One-step synthesis Oxidation-Reduction Particle Size Silicon Dioxide - chemistry SiO2 coating Spectrophotometry, Atomic Surface Properties X-Ray Diffraction |
| title | One-step synthesis and characterization of core–shell Fe@SiO2 nanocomposite for Cr (VI) reduction |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-16T22%3A19%3A52IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=One-step%20synthesis%20and%20characterization%20of%20core%E2%80%93shell%20Fe@SiO2%20nanocomposite%20for%20Cr%20(VI)%20reduction&rft.jtitle=The%20Science%20of%20the%20total%20environment&rft.au=Li,%20Yongchao&rft.date=2012-04-01&rft.volume=421-422&rft.spage=260&rft.epage=266&rft.pages=260-266&rft.issn=0048-9697&rft.eissn=1879-1026&rft_id=info:doi/10.1016/j.scitotenv.2012.01.010&rft_dat=%3Cproquest_cross%3E928910945%3C/proquest_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=928910945&rft_id=info:pmid/22381028&rft_els_id=S0048969712000125&rfr_iscdi=true |