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Cowpea pod (Vigna unguiculata) biomass as a low-cost biosorbent for removal of Pb(II) ions from aqueous solution

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dc.contributor.author Guyo, Upenyu
dc.contributor.author Moyo, Mambo
dc.date.accessioned 2018-12-11T09:23:04Z
dc.date.available 2018-12-11T09:23:04Z
dc.date.issued 2017
dc.identifier.issn 0167-6369
dc.identifier.uri https://link.springer.com/article/10.1007/s10661-016-5728-y
dc.identifier.uri http://hdl.handle.net/11408/3418
dc.description.abstract The use of cowpea pod (CPP) biomass for the removal of Pb(II) ions from aqueous solution was investigated. The effects of factors such as dosage concentration (0.2 to 1.6 g L−1), pH (2 to 8), contact time (5 to 120 min), metal ion concentrations (10 to 80 mg L−1) and temperature (20 to 50 °C) were examined through batch studies. The biosorption data conformed best to the Langmuir model at the three working temperatures (20, 30 and 40 °C) as revealed by the correlation coefficients (R2) which were greater than 0.940. The maximum sorption capacity of the CPP for Pb(II) was 32.96 mg g−1 at 313 K. Furthermore, the kinetic data fitted well to the pseudo-second-order model as it had the lowest sum of square error (SSE) values and correlation coefficients close to unity (R2 > 0.999). The thermodynamic parameters (ΔG°, ΔS° and ΔH°) showed that the biosorption process was spontaneous, feasible and endothermic. The results obtained in the present study indicated that cowpea pod biomass could be used for the effective removal of Pb(II) from aqueous solution. en_US
dc.language.iso en en_US
dc.publisher Springer en_US
dc.relation.ispartofseries Environmental Monitoring and Assessment;Vol. 189, No 2
dc.subject Biosorption en_US
dc.subject Cowpea pods en_US
dc.subject Pb(II) en_US
dc.subject Biosorption isotherms en_US
dc.title Cowpea pod (Vigna unguiculata) biomass as a low-cost biosorbent for removal of Pb(II) ions from aqueous solution en_US
dc.type Article en_US


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