Evaluation of vegetables residues as corrosion inhibitors

This work investigates the use of (Allium sativum L.) garlic peel extract, and (Theobroma L) cacao peel, as well as their synergy as a corrosion inhibitor for carbon steel in 0.5 mol.L-1 hydrochloric acid solution. The comparative study was performed in 1.11 g.L-1 of extract. The investigation was carried out using Fourier transform infrared spectroscopy (FTIR), electrochemical impedance spectroscopy (EIS), gravimetric techniques and scanning electron microscopy (SEM) as chemical, electrochemical and morphological characterization techniques, respectively. Gravimetric tests results showed a reduction in the corrosion rate of the extracts, with 90.7% efficiency for garlic extract and 89% for cacao extract, however, the mixture of the compounds presented an inhibition superior to 98%, showing the great synergism between the studied species. While the EIS results showed a higher impedance module value for cacao extract compared to garlic extract. Chemical analysis for extracts of garlic and cacao obtained by FTIR showed the presence of compounds based on sulfur and nitrogen, which are responsible for corrosion inhibiting effect. The SEM images obtained showed the formation of a film which reduces the evaluation of the corrosive process. Then, it is possible to conclude, that the carbon steel surface immersed in 0.5 mol.L-1 HCl solution with garlic peel extracts or cacao peel extracts or both, presents a corrosion inhibiting effect.

Effect of onion and garlic biowaste on germination and growth of microgreens

<p><strong>Background:</strong> Biowaste of onion and garlic peel is remaining unexploited for their sustainable use having potential as source of organic fertilizer. The present work was intended to investigate biowaste of onion and garlic peel water extract on germination and growth of fenugreek, mustard, falooda and garden cress seeds which could resource as microgreens</p><p><strong>Methods:</strong> Germination studies in selected seeds are carried out by water extracts of onion and garlic peel.</p><p><strong>Results:</strong> As far as growth is concerned variation is observed in all seeds. Significant escalated results were observed in garlic peel extract on fenugreek seeds as compared to other seeds. However, after treatment of onion extract moderate enhancement in growth observed in falooda and garden cress seeds. It is observed that there is no significant influence of treatment on germination of all seeds.</p><p><strong>Conclusions:</strong> Onion and garlic peels biowaste can be used as a natural growth enhancer in a sustainable way for growing microgreens of fenugreek and falooda seeds whereas onion and garlic peel extracts could inhibit the growth of Mustard and garden cress seeds.</p>