Photocatalytic Degradation of Ni(II)-Cyano and Co(III)-Cyano Complexes
Cyanide and metal–cyanide complexes are common constituents of effluents of mining, petroleum refining, and coal gasification. This paper presents the photocatalytic degradation of free cyanide, Ni(II)-cyanide (Ni(CN) 4 2− ), and Co(III)-cyanide (Co(CN) 6 3− ) complexes in aqueous TiO 2 suspensions....
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| Veröffentlicht in: | Water, air, and soil pollution air, and soil pollution, 2013-08, Vol.224 (8), p.1-7, Article 1647 |
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| creator | Osathaphan, Khemarath Ruengruehan, Kaiwit Yngard, Ria A. Sharma, Virender K. |
| description | Cyanide and metal–cyanide complexes are common constituents of effluents of mining, petroleum refining, and coal gasification. This paper presents the photocatalytic degradation of free cyanide, Ni(II)-cyanide (Ni(CN)
4
2−
), and Co(III)-cyanide (Co(CN)
6
3−
) complexes in aqueous TiO
2
suspensions. The effect of pH (9.5–12.0), TiO
2
loading (0.1–2.0 g/l), and the airflow rate (0.5–2.0 l/min) in a photoreactor on the degradation of the cyanide complexes was investigated. Free cyanide fully converted to cyanate (NCO
−
) under alkaline conditions. The maximum removal of the Ni(CN)
4
2−
ion in 180 min was found to be 90 %; forming CN
−
and NCO
−
ions as the major and minor products, respectively. Comparatively, the Co(CN)
6
3−
ion could be degraded only up to 30 % in 180 min. The schemes of the photocatalytic oxidation of cyanides are briefly described. The possible causes for differences in degradation of Ni(CN)
4
2−
and Co(CN)
6
3−
are also discussed. Optimum conditions for efficient removal of Ni(CN)
4
2−
and Co(CN)
6
3−
ions separately and in mixtures are given. |
| doi_str_mv | 10.1007/s11270-013-1647-5 |
| format | Article |
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4
2−
), and Co(III)-cyanide (Co(CN)
6
3−
) complexes in aqueous TiO
2
suspensions. The effect of pH (9.5–12.0), TiO
2
loading (0.1–2.0 g/l), and the airflow rate (0.5–2.0 l/min) in a photoreactor on the degradation of the cyanide complexes was investigated. Free cyanide fully converted to cyanate (NCO
−
) under alkaline conditions. The maximum removal of the Ni(CN)
4
2−
ion in 180 min was found to be 90 %; forming CN
−
and NCO
−
ions as the major and minor products, respectively. Comparatively, the Co(CN)
6
3−
ion could be degraded only up to 30 % in 180 min. The schemes of the photocatalytic oxidation of cyanides are briefly described. The possible causes for differences in degradation of Ni(CN)
4
2−
and Co(CN)
6
3−
are also discussed. Optimum conditions for efficient removal of Ni(CN)
4
2−
and Co(CN)
6
3−
ions separately and in mixtures are given.</description><identifier>ISSN: 0049-6979</identifier><identifier>EISSN: 1573-2932</identifier><identifier>DOI: 10.1007/s11270-013-1647-5</identifier><identifier>CODEN: WAPLAC</identifier><language>eng</language><publisher>Dordrecht: Springer Netherlands</publisher><subject>Air flow ; Applied sciences ; Atmospheric Protection/Air Quality Control/Air Pollution ; Chemical contaminants ; Climate Change/Climate Change Impacts ; Coal gasification ; Coal mining ; Cyanides ; Degradation ; Earth and Environmental Science ; Effluents ; Environment ; Environmental monitoring ; Exact sciences and technology ; Experiments ; Hydrogeology ; Ions ; Nickel ; Organic chemicals ; Oxidation ; Photocatalysis ; Photodegradation ; Photooxidation ; Pollution ; Potassium ; Soil Science & Conservation ; Statistical analysis ; Studies ; Titanium dioxide ; Water Quality/Water Pollution</subject><ispartof>Water, air, and soil pollution, 2013-08, Vol.224 (8), p.1-7, Article 1647</ispartof><rights>Springer Science+Business Media Dordrecht 2013</rights><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c379t-4edd553a1057249b020841b95803b7c90614a538bb2a917d28537d84e4ad49003</citedby><cites>FETCH-LOGICAL-c379t-4edd553a1057249b020841b95803b7c90614a538bb2a917d28537d84e4ad49003</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s11270-013-1647-5$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s11270-013-1647-5$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27924,27925,41488,42557,51319</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=27663484$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Osathaphan, Khemarath</creatorcontrib><creatorcontrib>Ruengruehan, Kaiwit</creatorcontrib><creatorcontrib>Yngard, Ria A.</creatorcontrib><creatorcontrib>Sharma, Virender K.</creatorcontrib><title>Photocatalytic Degradation of Ni(II)-Cyano and Co(III)-Cyano Complexes</title><title>Water, air, and soil pollution</title><addtitle>Water Air Soil Pollut</addtitle><description>Cyanide and metal–cyanide complexes are common constituents of effluents of mining, petroleum refining, and coal gasification. This paper presents the photocatalytic degradation of free cyanide, Ni(II)-cyanide (Ni(CN)
4
2−
), and Co(III)-cyanide (Co(CN)
6
3−
) complexes in aqueous TiO
2
suspensions. The effect of pH (9.5–12.0), TiO
2
loading (0.1–2.0 g/l), and the airflow rate (0.5–2.0 l/min) in a photoreactor on the degradation of the cyanide complexes was investigated. Free cyanide fully converted to cyanate (NCO
−
) under alkaline conditions. The maximum removal of the Ni(CN)
4
2−
ion in 180 min was found to be 90 %; forming CN
−
and NCO
−
ions as the major and minor products, respectively. Comparatively, the Co(CN)
6
3−
ion could be degraded only up to 30 % in 180 min. The schemes of the photocatalytic oxidation of cyanides are briefly described. The possible causes for differences in degradation of Ni(CN)
4
2−
and Co(CN)
6
3−
are also discussed. Optimum conditions for efficient removal of Ni(CN)
4
2−
and Co(CN)
6
3−
ions separately and in mixtures are given.</description><subject>Air flow</subject><subject>Applied sciences</subject><subject>Atmospheric Protection/Air Quality Control/Air Pollution</subject><subject>Chemical contaminants</subject><subject>Climate Change/Climate Change Impacts</subject><subject>Coal gasification</subject><subject>Coal mining</subject><subject>Cyanides</subject><subject>Degradation</subject><subject>Earth and Environmental Science</subject><subject>Effluents</subject><subject>Environment</subject><subject>Environmental monitoring</subject><subject>Exact sciences and technology</subject><subject>Experiments</subject><subject>Hydrogeology</subject><subject>Ions</subject><subject>Nickel</subject><subject>Organic chemicals</subject><subject>Oxidation</subject><subject>Photocatalysis</subject><subject>Photodegradation</subject><subject>Photooxidation</subject><subject>Pollution</subject><subject>Potassium</subject><subject>Soil Science & Conservation</subject><subject>Statistical analysis</subject><subject>Studies</subject><subject>Titanium dioxide</subject><subject>Water Quality/Water 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K.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Photocatalytic Degradation of Ni(II)-Cyano and Co(III)-Cyano Complexes</atitle><jtitle>Water, air, and soil pollution</jtitle><stitle>Water Air Soil Pollut</stitle><date>2013-08-01</date><risdate>2013</risdate><volume>224</volume><issue>8</issue><spage>1</spage><epage>7</epage><pages>1-7</pages><artnum>1647</artnum><issn>0049-6979</issn><eissn>1573-2932</eissn><coden>WAPLAC</coden><abstract>Cyanide and metal–cyanide complexes are common constituents of effluents of mining, petroleum refining, and coal gasification. This paper presents the photocatalytic degradation of free cyanide, Ni(II)-cyanide (Ni(CN)
4
2−
), and Co(III)-cyanide (Co(CN)
6
3−
) complexes in aqueous TiO
2
suspensions. The effect of pH (9.5–12.0), TiO
2
loading (0.1–2.0 g/l), and the airflow rate (0.5–2.0 l/min) in a photoreactor on the degradation of the cyanide complexes was investigated. Free cyanide fully converted to cyanate (NCO
−
) under alkaline conditions. The maximum removal of the Ni(CN)
4
2−
ion in 180 min was found to be 90 %; forming CN
−
and NCO
−
ions as the major and minor products, respectively. Comparatively, the Co(CN)
6
3−
ion could be degraded only up to 30 % in 180 min. The schemes of the photocatalytic oxidation of cyanides are briefly described. The possible causes for differences in degradation of Ni(CN)
4
2−
and Co(CN)
6
3−
are also discussed. Optimum conditions for efficient removal of Ni(CN)
4
2−
and Co(CN)
6
3−
ions separately and in mixtures are given.</abstract><cop>Dordrecht</cop><pub>Springer Netherlands</pub><doi>10.1007/s11270-013-1647-5</doi><tpages>7</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0049-6979 |
| ispartof | Water, air, and soil pollution, 2013-08, Vol.224 (8), p.1-7, Article 1647 |
| issn | 0049-6979 1573-2932 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_1439232643 |
| source | SpringerNature Journals |
| subjects | Air flow Applied sciences Atmospheric Protection/Air Quality Control/Air Pollution Chemical contaminants Climate Change/Climate Change Impacts Coal gasification Coal mining Cyanides Degradation Earth and Environmental Science Effluents Environment Environmental monitoring Exact sciences and technology Experiments Hydrogeology Ions Nickel Organic chemicals Oxidation Photocatalysis Photodegradation Photooxidation Pollution Potassium Soil Science & Conservation Statistical analysis Studies Titanium dioxide Water Quality/Water Pollution |
| title | Photocatalytic Degradation of Ni(II)-Cyano and Co(III)-Cyano Complexes |
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