Nickel removal by biosorption onto medlar male flowers coupled with photocatalysis on the spinel ZnMn2O4.
Identifieur interne : 000068 ( Main/Exploration ); précédent : 000067; suivant : 000069Nickel 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
Affiliations:
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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><affiliations><list><country><li>Algérie</li></country><region><li>Wilaya d'Alger</li></region><settlement><li>Alger</li></settlement></list><tree><noCountry><name sortKey="Chergui, Ahmed" sort="Chergui, Ahmed" uniqKey="Chergui A" first="Ahmed" last="Chergui">Ahmed Chergui</name><name sortKey="Khouider, Ali" sort="Khouider, Ali" uniqKey="Khouider A" first="Ali" last="Khouider">Ali Khouider</name><name sortKey="Trari, Mohamed" sort="Trari, Mohamed" uniqKey="Trari M" first="Mohamed" last="Trari">Mohamed Trari</name></noCountry><country name="Algérie"><region name="Wilaya d'Alger"><name sortKey="Madjene, Farid" sort="Madjene, Farid" uniqKey="Madjene F" first="Farid" last="Madjene">Farid Madjene</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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