Preparation and characterisation of biochars from elephant grass and their utilisation for aqueous nitrate removal: Effect of pyrolysis temperature

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dc.contributor.authorAdesemuyi, Mibinuola Florence
dc.contributor.authorAdebayo, Matthew Ayorinde
dc.contributor.authorAkinola, Adebisi Olayinka
dc.contributor.authorOlasehinde, Emmanuel Folorunso
dc.contributor.authorAdewole, Kehinde Abiodun
dc.date.accessioned2021-02-09T10:23:55Z
dc.date.available2021-02-09T10:23:55Z
dc.date.issued2020-09-21
dc.descriptionStaff Publicationen_US
dc.description.abstractBiochar is a solid material obtainable from biomass pyrolysis and useful for pollution alleviation and soil amendment. In this study, Biochars A and B were produced from elephant grass at pyrolytic temperatures of 400 ◦C and 600 ◦C, respectively, for removal of nitrate ion from aqueous solution. The physicochemical characteristics of the biochars were evaluated. The biochars were also characterised using Fourier Transform Infrared (FTIR) spectroscopy, Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX), and X-ray Diffraction (XRD). Operational variables such as pH, contact time, and concentration of nitrate ion were varied and optimum variables were obtained. Kinetic and equilibrium data were subjected to kinetic (pseudo-first order, pseudosecond order, Avrami fractional order, Elovich and intraparticle diffusion) and equilibrium (Langmuir, Freundlich, Liu, and Redlich-Peterson) models, respectively, to elucidate the interaction between the nitrate ion and biochars. The yields of Biochars A and B were 41.40 % and 32.25 %, respectively. The two biochars possessed good cation exchange capacity, water-holding capacity, carbon stability, and porosity. Avrami fractional kinetic order was the best model that explained the kinetic data. Maximum adsorption capacities obtained from Liu model (the best equilibrium model) are 140.7 and 237.5 mg g− 1 for Biochars A and B, respectively. Adsorption process was spontaneous and exothermic. There was a decrease in the disorderliness in the nitratebiochar system. Biochar B performed better than Biochar A for removal of nitrate ion from water. In summary, the biochars produced from elephant grass excellently removed nitrate ion from solution and could be utilised for water decontamination.en_US
dc.identifier.citationAdesemuyi, F. M., Adebayo, M. A., Akinola, A. O., Olasehinde, E. F., Adewole, K. A., & Lajide, L. (2020). Preparation and characterisation of biochars from elephant grass and their utilisation for aqueous nitrate removal: Effect of pyrolysis temperature. Journal of Environmental Chemical Engineering, 104507. doi:10.1016/j.jece.2020.104507en_US
dc.identifier.urihttps://www.sciencedirect.com/science/article/abs/pii/S2213343720308563
dc.identifier.urihttps://doi.org/10.1016/j.jece.2020.104507
dc.identifier.urihttp://repository.elizadeuniversity.edu.ng/handle/20.500.12398/823
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.subjectElephant grassen_US
dc.subjectBiocharen_US
dc.subjectNitrate ionen_US
dc.subjectPyrolysisen_US
dc.subjectLiu isothermen_US
dc.subjectAvrami fractional orderen_US
dc.titlePreparation and characterisation of biochars from elephant grass and their utilisation for aqueous nitrate removal: Effect of pyrolysis temperatureen_US
dc.typeArticleen_US
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