Nickel removal by biosorption onto medlar male flowers coupled with photocatalysis on the spinel ZnMn2O4.
Identifieur interne : 000047 ( PubMed/Checkpoint ); précédent : 000046; suivant : 000048Nickel removal by biosorption onto medlar male flowers coupled with photocatalysis on the spinel ZnMn2O4.
Auteurs : Ahmed Chergui ; Farid Madjene [Algérie] ; Mohamed Trari ; Ali KhouiderSource :
- Journal of environmental health science & engineering ; 2014.
Abstract
Ni2+ is a highly toxic above 0.07 mg/L and its removal is of high significance. The biosorption of Ni2+ onto medlar male flowers (MMF) was studied in relation with the physical parameters like pH, contact time, biosorbent dosage, Ni2+ concentration and temperature. The interaction biosorbent-Ni2+ was examined by the FTIR technique. The equilibrium was achieved within 40 min and the data were well fitted by the Langmuir and Redlich-Peterson (R-P) models. The maximum Ni2+ uptake capacity was 17.073 mg/g at 25°C and the Ni2+ removal follows a pseudo-second order kinetic with activation energy of 13.3 kJ/mol. The thermodynamic parameters: ΔS°, ΔH° and ΔG° showed that the biosorption was spontaneous and endothermic. MMF was used as a post treatment technique and the biosorption was coupled with the visible light driven Ni2+ reduction over the spinel ZnMn2O4. The effect of the pH, ZnMn2O4 loading and light intensity on the photoactivity was investigated. 77.5% of Ni2+ was reduced after ~140 min under optimal conditions. The Ni2+ removal reached a rate conversion of 96% of with the coupled system biosorption/photocatalysis is very promising for the water treatment.
DOI: 10.1186/2052-336X-12-13
PubMed: 24401700
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The biosorption of Ni2+ onto medlar male flowers (MMF) was studied in relation with the physical parameters like pH, contact time, biosorbent dosage, Ni2+ concentration and temperature. The interaction biosorbent-Ni2+ was examined by the FTIR technique. The equilibrium was achieved within 40 min and the data were well fitted by the Langmuir and Redlich-Peterson (R-P) models. The maximum Ni2+ uptake capacity was 17.073 mg/g at 25°C and the Ni2+ removal follows a pseudo-second order kinetic with activation energy of 13.3 kJ/mol. The thermodynamic parameters: ΔS°, ΔH° and ΔG° showed that the biosorption was spontaneous and endothermic. MMF was used as a post treatment technique and the biosorption was coupled with the visible light driven Ni2+ reduction over the spinel ZnMn2O4. The effect of the pH, ZnMn2O4 loading and light intensity on the photoactivity was investigated. 77.5% of Ni2+ was reduced after ~140 min under optimal conditions. The Ni2+ removal reached a rate conversion of 96% of with the coupled system biosorption/photocatalysis is very promising for the water treatment.</div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">24401700</PMID><DateCreated><Year>2014</Year><Month>02</Month><Day>25</Day></DateCreated><DateCompleted><Year>2014</Year><Month>02</Month><Day>25</Day></DateCompleted><DateRevised><Year>2014</Year><Month>03</Month><Day>07</Day></DateRevised><Article PubModel="Electronic"><Journal><JournalIssue CitedMedium="Print"><Volume>12</Volume><Issue>1</Issue><PubDate><Year>2014</Year><Month>Jan</Month><Day>08</Day></PubDate></JournalIssue><Title>Journal of environmental health science & engineering</Title><ISOAbbreviation>J Environ Health Sci Eng</ISOAbbreviation></Journal><ArticleTitle>Nickel removal by biosorption onto medlar male flowers coupled with photocatalysis on the spinel ZnMn2O4.</ArticleTitle><Pagination><MedlinePgn>13</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1186/2052-336X-12-13</ELocationID><Abstract><AbstractText>Ni2+ is a highly toxic above 0.07 mg/L and its removal is of high significance. The biosorption of Ni2+ onto medlar male flowers (MMF) was studied in relation with the physical parameters like pH, contact time, biosorbent dosage, Ni2+ concentration and temperature. The interaction biosorbent-Ni2+ was examined by the FTIR technique. The equilibrium was achieved within 40 min and the data were well fitted by the Langmuir and Redlich-Peterson (R-P) models. The maximum Ni2+ uptake capacity was 17.073 mg/g at 25°C and the Ni2+ removal follows a pseudo-second order kinetic with activation energy of 13.3 kJ/mol. The thermodynamic parameters: ΔS°, ΔH° and ΔG° showed that the biosorption was spontaneous and endothermic. MMF was used as a post treatment technique and the biosorption was coupled with the visible light driven Ni2+ reduction over the spinel ZnMn2O4. The effect of the pH, ZnMn2O4 loading and light intensity on the photoactivity was investigated. 77.5% of Ni2+ was reduced after ~140 min under optimal conditions. 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