EFFECT OF ZINC OXIDE, MANGANESE DIOXIDE NANOPARTICLES AND THEIR BLENDS ON YIELD AND QUALITY OF BIOETHANOL PRODUCED FROM CO-FERMENTATION OF BANANA AND POTATO PEELS

BB Uzoejinwa; Anthony O. Ezeama; Chidera L.  Anioke; Vintus Ogwo; Peace C. Ifeanyi-Obiorah; Chiemerie M. Obiora

doi:10.4314/njt.v44i1.14

Authors

B. B. Uzoejinwa Department of Agricultural and Bioresources Engineering, University of Nigeria, Nsukka
A. O. Ezeama Department of Agricultural and Bioresources Engineering, University of Nigeria, Nsukka
C. L. Anioke Department of Electronic and Computer Engineering, University of Nigeria, Nsukka
V. Ogwo Department of Agricultural and Bioresources Engineering, University of Nigeria, Nsukka
C. P. Ifeanyi-Obiorah Department of Agricultural and Bioresources Engineering, University of Nigeria, Nsukka
C. M. Obiora Department of Agricultural and Bioresources Engineering, University of Nigeria, Nsukka

DOI:

https://doi.org/10.4314/njt.v44i1.14

Keywords:

Bioethanol production, Nanoparticles’ effect, Co-fermentation, Enhanced yield and quality

Abstract

Effect of zinc oxide (ZnO) nanoparticles (NPs), manganese dioxide (MnO₂) NPs and their blends on the yield and quality of bioethanol produced from co-fermentation of banana and potato wastes has been investigated. Thus, in this study, ZnO, MnO₂ NPs and their novel blend were synthesized, characterized and employed as additives to the fermentation processes, and their effects on the yield and quality of bioethanol produced from various blends of the organic wastes were evaluated. Potato peels (PP) and banana peels (BP) were collected and prepared for sample characterization. Prepared samples were then pretreated using acid pretreatment method before enzymatic hydrolysis, co-fermentation and products analyses were carried out. Series of experiments were carried out using the feedstock blends: 100 wt.%BP: 0 wt.%PP, 30 wt. %BP: 70 wt.%PP, 70wt.%BP: 30 wt.%PP, 50 wt. %BP: 50 wt.%PP and 0 wt. %BP: 100 wt.%PP. The ZnO, MnO₂ and ZnO+MnO₂NPs were added to the feedstock blends, and the blends without nanoparticles served as control samples. Study results unveiled that the highest yield of bioethanol (29.72g/l) was obtained from the sample blend, 100wt%BP + 0wt.%PP treated with ZnO NPs, and this was followed by 28.52g/l of bioethanol obtained from 50wt.%BP + 50wt.%PP sample blend treated with ZnO and ZnO +MnO₂NPs. It was also observed that the amount of bioethanol produced from addition of ZnO NPs to samples is higher than those produced from control samples as well as from samples treated with MnO₂ and ZnO +MnO₂NPs. This may be because ZnO acts as a better catalyst, positively enhancing the enzymatic activity which accelerates the conversion of sugars into ethanol than MnO₂NPs. Product analysis results further unveiled the effect of the nanoparticles on the quality of bioethanol produced. Results of this study could enhance sustainability and economic viability of bioethanol production from organic wastes using nanoparticles.

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