Highly enhanced photocatalytic reduction of Cr(VI) on AgI/TiO2 under visible light irradiation: Influence of calcination temperature
[Display omitted] •β-AgI riched AgI/TiO2 was obtained after simple heat pretreatment at 350°C.•Greatly enhanced visible light response was observed on AgI/TiO2-350.•AgI/TiO2-350 exhibited superior photocatalytic activity and stability.•5 times rate constant for Cr(VI) reduction was achieved.•More ef...
Gespeichert in:
Veröffentlicht in: | Journal of hazardous materials 2016-04, Vol.307, p.213-220 |
---|---|
Hauptverfasser: | , , , , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
container_end_page | 220 |
---|---|
container_issue | |
container_start_page | 213 |
container_title | Journal of hazardous materials |
container_volume | 307 |
creator | Wang, Qi Shi, Xiaodong Xu, Jianjia Crittenden, John C. Liu, Enqin Zhang, Yi Cong, Yanqing |
description | [Display omitted]
•β-AgI riched AgI/TiO2 was obtained after simple heat pretreatment at 350°C.•Greatly enhanced visible light response was observed on AgI/TiO2-350.•AgI/TiO2-350 exhibited superior photocatalytic activity and stability.•5 times rate constant for Cr(VI) reduction was achieved.•More efficient separation and easier transfer of e−–h+ pairs were facilitated.
AgI/TiO2 was prepared using a dissolution-precipitation method, followed by calcination at different temperatures (100–700°C). The as-prepared AgI/TiO2 powders were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible diffuse reflectance spectroscopy (UV–Vis-DRS) and electrochemical impedance spectroscopy (EIS). The results revealed that calcination temperature significantly impacted the visible light absorption of AgI/TiO2 along with a shift from metastable γ-AgI to relatively stable β-AgI. We found that highest photocatalytic reduction rate of Cr(VI) and β-AgI content were obtained for a calcination temperature of 350°C. Furthermore, the pseudo-first order rate constant was five times that for a photocatalyst calcined at 100°C. The dramatically enhanced reduction rate of Cr(VI) was attributed to enhanced visible light absorption and greatly reduced charge transfer resistance, which eventually facilitates more efficient separation and easier transfer of photogenerated electron–hole pairs to the catalyst surface. Other experimental conditions were also carefully investigated and optimized with initial AgI loading percentage (5%), catalyst dosage (1.0g/L), coexisting organics (1.0mmol/L EDTA) and pH (1–2). The optimal AgI/TiO2 exhibited good stability with little change in activity after 5 cycles. |
doi_str_mv | 10.1016/j.jhazmat.2015.12.050 |
format | Article |
fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_1780533311</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><els_id>S0304389415303101</els_id><sourcerecordid>1769619970</sourcerecordid><originalsourceid>FETCH-LOGICAL-c468t-19805ee20a4648b336426cfd73cb46e617c9eacec4023d07a9fa00299217bdf3</originalsourceid><addsrcrecordid>eNqNkUtv1DAUhS0EokPhJ4C8LIukfsVO2KBqVOhIlboZsbUc-6bjUR6D7VQa1vxwnM7AtqyurPudc-VzEPpISUkJldf7cr8zvwaTSkZoVVJWkoq8QitaK15wzuVrtCKciILXjbhA72LcE0KoqsRbdMGkqitG2Qr9vvOPu_6IYdyZ0YLDh92UJmuS6Y_JWxzAzTb5acRTh9fh6sfmM86Pm8fN9dY_MDyPDgJ-8tG3PeA-myXsQzDOm0X1BW_Grp8hWy8G1vTWj88bnGA4QDBpDvAevelMH-HDeV6i7bfb7fquuH_4vlnf3BdWyDoVtKlJBcCIEVLUbf6jYNJ2TnHbCgmSKtuAsWAFYdwRZZrOEMKahlHVuo5foquT7SFMP2eISQ8-Wuh7M8I0R01V9s_RUfofqOI1q-qMv4zKRtKmUSSj1Qm1YYoxQKcPwQ8mHDUlemlV7_W5Vb20qinTudWs-3Q-MbcDuH-qvzVm4OsJgJzek4ego_VL6M4HsEm7yb9w4g9d3rZI</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>1769619970</pqid></control><display><type>article</type><title>Highly enhanced photocatalytic reduction of Cr(VI) on AgI/TiO2 under visible light irradiation: Influence of calcination temperature</title><source>ScienceDirect Journals (5 years ago - present)</source><creator>Wang, Qi ; Shi, Xiaodong ; Xu, Jianjia ; Crittenden, John C. ; Liu, Enqin ; Zhang, Yi ; Cong, Yanqing</creator><creatorcontrib>Wang, Qi ; Shi, Xiaodong ; Xu, Jianjia ; Crittenden, John C. ; Liu, Enqin ; Zhang, Yi ; Cong, Yanqing</creatorcontrib><description>[Display omitted]
•β-AgI riched AgI/TiO2 was obtained after simple heat pretreatment at 350°C.•Greatly enhanced visible light response was observed on AgI/TiO2-350.•AgI/TiO2-350 exhibited superior photocatalytic activity and stability.•5 times rate constant for Cr(VI) reduction was achieved.•More efficient separation and easier transfer of e−–h+ pairs were facilitated.
AgI/TiO2 was prepared using a dissolution-precipitation method, followed by calcination at different temperatures (100–700°C). The as-prepared AgI/TiO2 powders were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible diffuse reflectance spectroscopy (UV–Vis-DRS) and electrochemical impedance spectroscopy (EIS). The results revealed that calcination temperature significantly impacted the visible light absorption of AgI/TiO2 along with a shift from metastable γ-AgI to relatively stable β-AgI. We found that highest photocatalytic reduction rate of Cr(VI) and β-AgI content were obtained for a calcination temperature of 350°C. Furthermore, the pseudo-first order rate constant was five times that for a photocatalyst calcined at 100°C. The dramatically enhanced reduction rate of Cr(VI) was attributed to enhanced visible light absorption and greatly reduced charge transfer resistance, which eventually facilitates more efficient separation and easier transfer of photogenerated electron–hole pairs to the catalyst surface. Other experimental conditions were also carefully investigated and optimized with initial AgI loading percentage (5%), catalyst dosage (1.0g/L), coexisting organics (1.0mmol/L EDTA) and pH (1–2). The optimal AgI/TiO2 exhibited good stability with little change in activity after 5 cycles.</description><identifier>ISSN: 0304-3894</identifier><identifier>EISSN: 1873-3336</identifier><identifier>DOI: 10.1016/j.jhazmat.2015.12.050</identifier><identifier>PMID: 26785212</identifier><language>eng</language><publisher>Netherlands: Elsevier B.V</publisher><subject>AgI/TiO2 ; Calcination ; Catalysts ; Cr(VI) reduction ; Electrochemical impedance spectroscopy ; Heat pretreatment ; Light absorption ; Photocatalysis ; Reduction ; Titanium dioxide ; Visible light ; X-rays</subject><ispartof>Journal of hazardous materials, 2016-04, Vol.307, p.213-220</ispartof><rights>2015 Elsevier B.V.</rights><rights>Copyright © 2015 Elsevier B.V. All rights reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c468t-19805ee20a4648b336426cfd73cb46e617c9eacec4023d07a9fa00299217bdf3</citedby><cites>FETCH-LOGICAL-c468t-19805ee20a4648b336426cfd73cb46e617c9eacec4023d07a9fa00299217bdf3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.jhazmat.2015.12.050$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3549,27923,27924,45994</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/26785212$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Wang, Qi</creatorcontrib><creatorcontrib>Shi, Xiaodong</creatorcontrib><creatorcontrib>Xu, Jianjia</creatorcontrib><creatorcontrib>Crittenden, John C.</creatorcontrib><creatorcontrib>Liu, Enqin</creatorcontrib><creatorcontrib>Zhang, Yi</creatorcontrib><creatorcontrib>Cong, Yanqing</creatorcontrib><title>Highly enhanced photocatalytic reduction of Cr(VI) on AgI/TiO2 under visible light irradiation: Influence of calcination temperature</title><title>Journal of hazardous materials</title><addtitle>J Hazard Mater</addtitle><description>[Display omitted]
•β-AgI riched AgI/TiO2 was obtained after simple heat pretreatment at 350°C.•Greatly enhanced visible light response was observed on AgI/TiO2-350.•AgI/TiO2-350 exhibited superior photocatalytic activity and stability.•5 times rate constant for Cr(VI) reduction was achieved.•More efficient separation and easier transfer of e−–h+ pairs were facilitated.
AgI/TiO2 was prepared using a dissolution-precipitation method, followed by calcination at different temperatures (100–700°C). The as-prepared AgI/TiO2 powders were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible diffuse reflectance spectroscopy (UV–Vis-DRS) and electrochemical impedance spectroscopy (EIS). The results revealed that calcination temperature significantly impacted the visible light absorption of AgI/TiO2 along with a shift from metastable γ-AgI to relatively stable β-AgI. We found that highest photocatalytic reduction rate of Cr(VI) and β-AgI content were obtained for a calcination temperature of 350°C. Furthermore, the pseudo-first order rate constant was five times that for a photocatalyst calcined at 100°C. The dramatically enhanced reduction rate of Cr(VI) was attributed to enhanced visible light absorption and greatly reduced charge transfer resistance, which eventually facilitates more efficient separation and easier transfer of photogenerated electron–hole pairs to the catalyst surface. Other experimental conditions were also carefully investigated and optimized with initial AgI loading percentage (5%), catalyst dosage (1.0g/L), coexisting organics (1.0mmol/L EDTA) and pH (1–2). The optimal AgI/TiO2 exhibited good stability with little change in activity after 5 cycles.</description><subject>AgI/TiO2</subject><subject>Calcination</subject><subject>Catalysts</subject><subject>Cr(VI) reduction</subject><subject>Electrochemical impedance spectroscopy</subject><subject>Heat pretreatment</subject><subject>Light absorption</subject><subject>Photocatalysis</subject><subject>Reduction</subject><subject>Titanium dioxide</subject><subject>Visible light</subject><subject>X-rays</subject><issn>0304-3894</issn><issn>1873-3336</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNqNkUtv1DAUhS0EokPhJ4C8LIukfsVO2KBqVOhIlboZsbUc-6bjUR6D7VQa1vxwnM7AtqyurPudc-VzEPpISUkJldf7cr8zvwaTSkZoVVJWkoq8QitaK15wzuVrtCKciILXjbhA72LcE0KoqsRbdMGkqitG2Qr9vvOPu_6IYdyZ0YLDh92UJmuS6Y_JWxzAzTb5acRTh9fh6sfmM86Pm8fN9dY_MDyPDgJ-8tG3PeA-myXsQzDOm0X1BW_Grp8hWy8G1vTWj88bnGA4QDBpDvAevelMH-HDeV6i7bfb7fquuH_4vlnf3BdWyDoVtKlJBcCIEVLUbf6jYNJ2TnHbCgmSKtuAsWAFYdwRZZrOEMKahlHVuo5foquT7SFMP2eISQ8-Wuh7M8I0R01V9s_RUfofqOI1q-qMv4zKRtKmUSSj1Qm1YYoxQKcPwQ8mHDUlemlV7_W5Vb20qinTudWs-3Q-MbcDuH-qvzVm4OsJgJzek4ego_VL6M4HsEm7yb9w4g9d3rZI</recordid><startdate>20160415</startdate><enddate>20160415</enddate><creator>Wang, Qi</creator><creator>Shi, Xiaodong</creator><creator>Xu, Jianjia</creator><creator>Crittenden, John C.</creator><creator>Liu, Enqin</creator><creator>Zhang, Yi</creator><creator>Cong, Yanqing</creator><general>Elsevier B.V</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope><scope>7ST</scope><scope>7U7</scope><scope>C1K</scope><scope>SOI</scope><scope>7QQ</scope><scope>7SR</scope><scope>7SU</scope><scope>8BQ</scope><scope>8FD</scope><scope>FR3</scope><scope>JG9</scope><scope>KR7</scope></search><sort><creationdate>20160415</creationdate><title>Highly enhanced photocatalytic reduction of Cr(VI) on AgI/TiO2 under visible light irradiation: Influence of calcination temperature</title><author>Wang, Qi ; Shi, Xiaodong ; Xu, Jianjia ; Crittenden, John C. ; Liu, Enqin ; Zhang, Yi ; Cong, Yanqing</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c468t-19805ee20a4648b336426cfd73cb46e617c9eacec4023d07a9fa00299217bdf3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>AgI/TiO2</topic><topic>Calcination</topic><topic>Catalysts</topic><topic>Cr(VI) reduction</topic><topic>Electrochemical impedance spectroscopy</topic><topic>Heat pretreatment</topic><topic>Light absorption</topic><topic>Photocatalysis</topic><topic>Reduction</topic><topic>Titanium dioxide</topic><topic>Visible light</topic><topic>X-rays</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wang, Qi</creatorcontrib><creatorcontrib>Shi, Xiaodong</creatorcontrib><creatorcontrib>Xu, Jianjia</creatorcontrib><creatorcontrib>Crittenden, John C.</creatorcontrib><creatorcontrib>Liu, Enqin</creatorcontrib><creatorcontrib>Zhang, Yi</creatorcontrib><creatorcontrib>Cong, Yanqing</creatorcontrib><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>Environment Abstracts</collection><collection>Toxicology Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Environment Abstracts</collection><collection>Ceramic Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>Environmental Engineering Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><collection>Civil Engineering Abstracts</collection><jtitle>Journal of hazardous materials</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Wang, Qi</au><au>Shi, Xiaodong</au><au>Xu, Jianjia</au><au>Crittenden, John C.</au><au>Liu, Enqin</au><au>Zhang, Yi</au><au>Cong, Yanqing</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Highly enhanced photocatalytic reduction of Cr(VI) on AgI/TiO2 under visible light irradiation: Influence of calcination temperature</atitle><jtitle>Journal of hazardous materials</jtitle><addtitle>J Hazard Mater</addtitle><date>2016-04-15</date><risdate>2016</risdate><volume>307</volume><spage>213</spage><epage>220</epage><pages>213-220</pages><issn>0304-3894</issn><eissn>1873-3336</eissn><abstract>[Display omitted]
•β-AgI riched AgI/TiO2 was obtained after simple heat pretreatment at 350°C.•Greatly enhanced visible light response was observed on AgI/TiO2-350.•AgI/TiO2-350 exhibited superior photocatalytic activity and stability.•5 times rate constant for Cr(VI) reduction was achieved.•More efficient separation and easier transfer of e−–h+ pairs were facilitated.
AgI/TiO2 was prepared using a dissolution-precipitation method, followed by calcination at different temperatures (100–700°C). The as-prepared AgI/TiO2 powders were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible diffuse reflectance spectroscopy (UV–Vis-DRS) and electrochemical impedance spectroscopy (EIS). The results revealed that calcination temperature significantly impacted the visible light absorption of AgI/TiO2 along with a shift from metastable γ-AgI to relatively stable β-AgI. We found that highest photocatalytic reduction rate of Cr(VI) and β-AgI content were obtained for a calcination temperature of 350°C. Furthermore, the pseudo-first order rate constant was five times that for a photocatalyst calcined at 100°C. The dramatically enhanced reduction rate of Cr(VI) was attributed to enhanced visible light absorption and greatly reduced charge transfer resistance, which eventually facilitates more efficient separation and easier transfer of photogenerated electron–hole pairs to the catalyst surface. Other experimental conditions were also carefully investigated and optimized with initial AgI loading percentage (5%), catalyst dosage (1.0g/L), coexisting organics (1.0mmol/L EDTA) and pH (1–2). The optimal AgI/TiO2 exhibited good stability with little change in activity after 5 cycles.</abstract><cop>Netherlands</cop><pub>Elsevier B.V</pub><pmid>26785212</pmid><doi>10.1016/j.jhazmat.2015.12.050</doi><tpages>8</tpages></addata></record> |
fulltext | fulltext |
identifier | ISSN: 0304-3894 |
ispartof | Journal of hazardous materials, 2016-04, Vol.307, p.213-220 |
issn | 0304-3894 1873-3336 |
language | eng |
recordid | cdi_proquest_miscellaneous_1780533311 |
source | ScienceDirect Journals (5 years ago - present) |
subjects | AgI/TiO2 Calcination Catalysts Cr(VI) reduction Electrochemical impedance spectroscopy Heat pretreatment Light absorption Photocatalysis Reduction Titanium dioxide Visible light X-rays |
title | Highly enhanced photocatalytic reduction of Cr(VI) on AgI/TiO2 under visible light irradiation: Influence of calcination temperature |
url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-08T20%3A58%3A28IST&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=Highly%20enhanced%20photocatalytic%20reduction%20of%20Cr(VI)%20on%20AgI/TiO2%20under%20visible%20light%20irradiation:%20Influence%20of%20calcination%20temperature&rft.jtitle=Journal%20of%20hazardous%20materials&rft.au=Wang,%20Qi&rft.date=2016-04-15&rft.volume=307&rft.spage=213&rft.epage=220&rft.pages=213-220&rft.issn=0304-3894&rft.eissn=1873-3336&rft_id=info:doi/10.1016/j.jhazmat.2015.12.050&rft_dat=%3Cproquest_cross%3E1769619970%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=1769619970&rft_id=info:pmid/26785212&rft_els_id=S0304389415303101&rfr_iscdi=true |