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The magnetic biochar (γ-Fe2O3@BC) derived from banana peels was synthesized by a facile one-pot thermal process and used as the cost-effective and recyclable persulfate (PS) activator ...for organic contaminants degradation. The results showed that the encapsulated iron oxide nanoparticles not only introduced the magnetism into biochar for easy separation, but also influenced the catalytic ability for PS activation. The γ-Fe2O3@BC was found to be highly effective for bisphenol A (BPA) degradation without pH adjustment. A complete removal of BPA was obtained within 20 min with an observed rate constant (kobs) of 0.1849 min−1, which was almost two times as large as that (0.0956 min−1) of pure biochar. Further, it exhibited high mineralization efficiency for the degradation of various organic contaminants. The high catalytic activity could be attributed to large BET surface area, dispersed iron species, abundant oxygen functional groups and rich doped nitrogen. Radical quenching experiments and electron spin resonance (ESR) studies confirmed that OH, SO4− and O2− were all involved in the radical oxidation process which was responsible for BPA degradation. A mechanism of PS activation by the γ-Fe2O3@BC catalyst was proposed based on the synergistic effect of biochar and iron.
La prévalence de l’allergie à la banane dans le monde représente entre 0,04 et 1,2 % en population générale. Nous rapportons les 24 cas d’anaphylaxie liés à la banane déclarés au Réseau ...d’allergo-vigilance® (RAV) depuis 2002, soit 0,86 % des 2801 cas d’anaphylaxies alimentaires reçus au RAV de 2002 à août 2022. Ces anaphylaxies touchent en majorité l’adulte (18 cas), avec des allergies croisées fréquemment retrouvées, (latex-fruits, et LTP). Six cas d’anaphylaxies sont rapportés chez des enfants. Un cofacteur est présent quatre fois. L’objectif de ce travail est d’analyser ces cas d’anaphylaxies, et de proposer une revue générale sur l’allergie à la banane.
The prevalence of banana allergy in the world among food allergies represents between 0.04 and 1.2% in the general population. Twenty-four cases of banana anaphylaxis have been reported to the Allergo-vigilance® network, since 2002 (0.86% of the 2801 cases of food anaphylaxis received at the RAV from 2002 to August 2022). These anaphylaxis affect adults more (18 cases), with more cross-allergy issues (latex-fruits, LTP), six anaphylaxis were reported in children. A cofactor is reported in four cases. The purpose of this work is to analyze these cases, and to propose a general review about banana allergy.
This work evaluated the novel application of biochars derived from potassium (K)-rich feedstock (banana peels (BB) and cauliflower leaves (CB)). The sorptive property of the produced biochars was ...evaluated with multi-element Copper (Cu(II)), Cadmium (Cd(II)) and Led (Pb(II)) sorption experiments. Morphologies of the pre- and post-sorption samples were characterized using SEM/EDS and XRD spectra analyses. The produced biochar was further subjected to mono-element sorption studies to explore the effect of the pH value of the sorbate solution on the removal efficiency of Cu(II), Cd(II) and Pb(II) ions. Biochar productivity was noticeably high (61.44 and 64.66% for BB and CB, respectively) due to the catalytic action of K during the pyrolytic conversion of the feedstock. K-minerals were the predominant on the XRD patterns of both biochars. Metal sorption capacity of BB was much greater than that of CB due to its higher electrostatic attraction, which was the predominant mechanism governed sorption process. Sorption of metal ions onto BB and CB was pH-dependent as the sorption capacity increased significantly with the increase of the pH value of sorbate solutions (6.0 with Cu(II), Pb(II) and 8.0 with Cd(II)). Dynamics of metal ions sorption onto biochars showed competitive sorption following the order: Pb(II) > Cu(II) > Cd(II).
•The XRD patterns showed the excellent crystallinity of both banana peel biochar (BB) and cauliflower leaves biochar (CB).•Apparent sorption of heavy metals was rapid during the first 5–10 h, and the equilibrium was reached at 24 h.•Pseudo-second-order was the best model describing the sorption of Pb(II) and Cd(II) onto both biochars (R2 > 0.94).•Sorption capacity (Smax) of heavy metal was higher in BB as compared to other biochar reported in literature.
•Facile one-step HTC to produce biochars with excellent adsorption performance.•Fresh and dehydrated banana peels were used to produce biochars via HTC.•As-obtained biochars had abundant surface ...oxygen containing groups.•The banana peel based biochar had lead adsorption capacity of 359mg·g−1.
Fresh and dehydrated banana peels were used as biomass feedstock to produce highly effective sorbent biochars through a facile one-step hydrothermal carbonization approach with 20%vol phosphoric acid as the reaction medium. The elemental ratio of oxygen content of the two as-prepared biochars were about 20%, and the FT-IR analysis confirmed the existence of abundant surface functional groups such as hydroxyl and carboxyl which greatly enhanced the adsorption performance. The sorbents showed excellent lead clarification capability of 359mg·g−1 and 193mg·g−1 for dehydrated and fresh banana peels based biochars, respectively. The change of the CO/OCO and the appearance of PbO/PbOC on the surface after adsorption confirmed that the ion exchange might be the dominant mechanism. The dehydration and pulverization pre-treatment and the addition of phosphoric acid can benefit the formation of those functional groups and hydrothermal carbonization can be a promising method to transfer biomass like fruit peels into biochars with excellent adsorption performance.
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•CNFs-stabilized emulsions were produced using high-pressure and ultrasound.•Cavitation phenomenon and shear forces led to a reduction on the CNFs length.•Droplets flocculation were ...observed in the emulsions produced using ultrasound.•Smaller nanofibers acted as an effective barrier against droplets coalescence.•Changes on particle properties influence the application of CNFs as an emulsifier.
Cellulose nanofibers (CNFs) from banana peels was evaluated as promising stabilizer for oil-in-water emulsions. CNFs were treated using ultrasound and high-pressure homogenizer. Changes on the size, crystallinity index and zeta potential of CNFs were associated with the intense effects of cavitation phenomenon and shear forces promoted by mechanical treatments. CNFs-stabilized emulsions were produced under the same process conditions as the particles. Coalescence phenomenon was observed in the emulsions produced using high-pressure homogenizer, whereas droplets flocculation occurred in emulsions processed by ultrasound. In the latter, coalescence stability was associated with effects of cavitation forces acting on the CNFs breakup. Thus, smaller droplets created during the ultrasonication process could be recovered by particles that acted as an effective barrier against droplets coalescence. Our results improved understanding about the relationship between the choice of emulsification process and their effects on the CNFs properties influencing the potential application of CNFs as a food emulsifier.
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•Six types of Mg-loaded biochars were synthesized for NH4+-N and TP adsorption.•Mg2+ exchange is dominant mechanism for ammonium adsorption on Mg-loaded biochars.•Precipitation and ...electrostatic attraction were the possible TP sorption mechanisms.•Magnesium content and PVtot were predominant factors affecting biochar sorption.•Mg-loaded biochars have a great potential in treatment of waste water.
Herein, biochars from 6 different feedstocks (taro straw, corn straw, cassava straw, Chinese fir straw, banana straw, and Camellia oleifera shell) were produced using magnesium chloride (MgCl2) as a modifier due to their sorption behavior toward NH4+-N and phosphorus in an aqueous solution. The biochar characteristics were evaluated, including pH, pHPZC, biochar magnesium content, and total pore volume (PVtot). The experimental results in terms of the kinetics and equilibrium isotherms showed that the cassava straw and banana straw biochars exhibited the theoretical maximum saturated adsorption capacities of 24.04 mg·g−1 (NH4+-N) and 31.15 mg·g−1 (TP), respectively. Biochar produced from these feedstocks had higher magnesium contents and greater total pore volumes, reflecting the significant contributions from magnesium and steric effects. FTIR, XRD, and SEM/EDS analyses demonstrated that NH4+-N and TP sorption mechanisms predominantly involved surface electrostatic attraction, Mg2+ precipitates and complexation with surface hydroxyl functional groups.
We report nitrogen-doped, activated carbon foams prepared from banana peels using a self-template method with zinc nitrate, 2-aminophenol, and furfural involved. Importantly, we have extended the ...banana peel zinc complex soft-template method to investigate the effects of carbonization temperature and postcarbonization CO2 activation on the carbon pore structure, and examined the effect of N-content on the carbon foam’s equilibrium adsorption capacity for CO2. The carbon foams contain up to 6.0 wt % nitrogen and feature cellular macroporous structures with BET specific surface areas up to 1426 m2·g–1. The potential of the carbon foams for CO2/N2, CO2/CH4, and CH4/N2 separations was evaluated by measurement of pure fluid adsorption capacities using a gravimetric adsorption apparatus and calculation of adsorption selectivies at a range of conditions using ideal adsorption solution theory (IAST). The adsorption capacities at a 4000 kPa and 298 K were CO2 9.21 mmol·g–1, CH4 5.29 mmol·g–1, and N2 3.29 mmol·g–1.
•Banana contains several bioactive antioxidant compounds.•These compounds include phenolics, carotenoids, biogenic amines and phytosterols.•These are highly desirable in the diet exerting positive ...effects on the human health.
Banana is a very popular fruit in the world market and is consumed as staple food in many countries. It is grown worldwide and constitutes the fifth most important agricultural food crop in terms of world trade. It has been classified into the dessert or sweet bananas and the cooking bananas or plantains. It is either eaten raw or processed, and also as a functional ingredient in various food products. Banana contains several bioactive compounds, such as phenolics, carotenoids, biogenic amines and phytosterols, which are highly desirable in the diet as they exert many positive effects on human health and well-being. Many of these compounds have antioxidant activities and are effective in protecting the body against various oxidative stresses. In the past, bananas were effectively used in the treatment of various diseases, including reducing the risk of many chronic degenerative disorders. In the present review, historical background, cultivar classification, beneficial phytochemicals, antioxidant activity and health benefits of bananas are discussed.
•Banana peels have been tested for corrosion inhibition of mild steel in 1M HCl.•Weight loss, electrochemical and AFM Techniques are used for inhibition study.•Maximum corrosion inhibition of 92% is ...achieved using raw banana peel extract.•The extracts have been characterized using HPLC, UV–vis, and FTIR techniques.•Gallocatechin and catechin is responsible for inhibitive property of the extracts.
The inhibition and adsorption effects of the aqueous extracts of Musa paradisica (Banana) peels on mild steel corrosion in 1M HCl as well as change in inhibition efficiency with ripening of the peels are investigated by weight loss measurement, electrochemical impedance spectroscopy (EIS), Tafel polarization and atomic force microscopy (AFM) techniques. Inhibition ability of the extracts decreases with the maturity stages. Furthermore, the extracts are characterized by FTIR spectroscopy, UV–visible spectroscopy and high performance liquid chromatography (HPLC) techniques. Adsorption behavior of the extracts is also studied, which suggest Langmuir isotherm model as a most suitable adsorption mechanism.
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