Phytosynthesis via wasted onion peel extract of samarium oxide/silver core/shell nanoparticles for excellent inhibition of microbes

Alshahrani, Aisha A.; Alqarni, Laila S.; Alghamdi, Maha D.; Alotaibi, Nasser F.; Moustafa, Shaima M.N.; Nassar, Amr M.

doi:10.1016/j.heliyon.2024.e24815

Cited by 5 publications

(2 citation statements)

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“…The content of such compounds is lower for white versus yellow and red onion peel [106]. The FTIR-ATR spectrum of the onion peel before biosorption shows a wide signal band assigned to the stretching frequency of the -OH groups at around 3255 cm −1 (Figure 11a), generated by the hydrogen bridges formed between organic molecules in the biomaterial [105]. The -OH groups could derive from phenols and flavonoids, which provide onion peel with its antioxidant capacity [38].…”

Section: Ftir-atr Analysismentioning

confidence: 99%

“…The band at 1227 cm −1 corresponds to the C-O stretching frequency of the ethers, and the bands at 1178 cm −1 and 1004 cm −1 to the signals inside and outside the C-H plane and to the stretching frequency of the C-O bonds in the carbohydrates, respectively. Below 800 cm −1 is the fingerprint signal of the biomaterial [62,83,85,86,105,107].…”

Section: Ftir-atr Analysismentioning

confidence: 99%

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Onion Peel: A Promising, Economical, and Eco-Friendly Alternative for the Removal of Divalent Cobalt from Aqueous Solutions

Lizcano-Delgado,

Martínez-Vázquez,

Cristiani-Urbina

et al. 2024

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There is a growing need for an economical and efficient method capable of removing heavy metals from residual water. The current contribution aimed to evaluate the capacity of onion peel, an abundant agroindustrial waste product, to remove divalent cobalt (Co2+) from aqueous solutions. Onion peel was submitted to proximal chemical analysis, and various operational factors involved in biosorption were tested. The most suitable temperature (30 °C), pH (7.0), and biosorbent particle size (300–800 µm) were found. With an initial Co2+ concentration of 380 mg L−1, the maximum capacity of Co2+ removal was 59.88 mg g−1 in 120 min. The pseudo-second order and Langmuir models provided the best fit to the experimental kinetics and equilibrium of Co2+ biosorption, respectively. The thermodynamic study evidenced an exothermic, non-spontaneous, and favorable reaction (ΔH0 = −5.78 kJ mol−1; ΔS0 = −21.13 J mol−1 K−1), suggesting the formation of stable bonds in the biosorbent-Co2+ complex. The carbonyl and hydroxyl groups apparently play a fundamental role in Co2+ removal, and electrostatic attraction, ion exchange, and chemisorption are the principal mechanisms. Thus, the biosorption of Co2+ by onion peel has potential as an economical, eco-friendly, efficient, and sustainable treatment for wastewater.

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Section: Ftir-atr Analysismentioning

confidence: 99%