Enhanced sequestration of Cr(VI) onto plant extract anchored on carbon-coated aluminium oxide composite

This study focused on the use of a fix-bed column in the removal of amoxicillin from an aqueous solution by the application of silver nano-based adsorbents. The silver nanoparticle and nanocomposite were produced by a green synthetic approach. Column adsorption was performed at a flow rate of 5.88 mL/min, bed height of (5.0–7.0 cm), and amoxicillin concentration of 20–40 mg/L. Adsorption data were fitted to Thomas, Adams-Bohart, and Yoon-Nelson models. The color change from light yellow to dark brown showed that silver ions have been reduced to silver atoms. Energy dispersive spectroscopy (EDS) analysis showed the characteristic silver peak of the nano-adsorbents at 3.0 keV containing 57.29% silver in the synthesized silver nanoparticle. Analysis of silver nanoparticles-maize leaf composite revealed its pore distribution to be uneven with an average pore size of 7.44 nm. The data were best fitted to the Thomas model more than Adams-Bohart and Yoon-Nelson’s models. Thomas’s model showed that an increase in concentration and flow rate led to an increase in qo (maximum adsorption capacity) and kTH (Thomas rate constant), However, the increase in bed height led to a decrease in both qo and kTH. The correlation coefficients were in the range 0.6528–0.9797. The results revealed that the silver nanoparticles-maize leaf combo is suitable for the continuous adsorption of amoxicillin in aqueous media with the best performance at a lower concentration, higher bed height, and flow rate.

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Adams-Bohart, Yoon-Nelson, and Thomas modeling of the fix-bed continuous column adsorption of amoxicillin onto silver nanoparticle-maize leaf composite

Omitola

Abonyi

Akpomie

et al. 2022

Appl Water Sci

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Adsorption mechanism and modeling of radionuclides and heavy metals onto ZnO nanoparticles: a review

et al. 2022

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The contamination of environmental waters with heavy metals and radionuclides is increasing because of rapid industrial and population growth. The removal of these contaminants from water via adsorption onto metal nanoparticles is an efficient and promising technique to abate the toxic effects associated with these pollutants. Among metal nanoparticle adsorbents, zinc oxide nanoparticles (ZnONPs) have received tremendous attention owing to their biocompatibility, affordability, long-term stability, surface characteristics, nontoxicity, and powerful antibacterial activity against microbes found in water. In this review, we considered the adsorption of heavy metals and radionuclides onto ZnONPs. We examined the isotherm, kinetic, and thermodynamic modeling of the process as well as the adsorption mechanism to provide significant insights into the interactions between the pollutants and the nanoparticles. The ZnONPs with surface areas (3.93 to 58.0 m2/g) synthesized by different methods exhibited different adsorption capacities (0.30 to 1500 mg/g) for the pollutants. The Langmuir and Freundlich isotherms were most suitable for the adsorption process. The Langmuir separation factor indicated favorable adsorption of all the pollutants on ZnONPs. The pseudo-second-order kinetics presented the best for the adsorption of the adsorbates with regression values in the range of 0.986–1.000. Spontaneous adsorption was obtained in most of the studies involving endothermic and exothermic processes. The complexation, precipitation, ion exchange, and electrostatic interactions are the probable mechanisms in the adsorption onto ZnONPs with a predominance of complexation. The desorption process, reusability of ZnONPs as well as direction for future investigations were also presented.

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Novel synthesis of γ-Al2O3/carbon hollow nanosphere nanocomposite for the optimal removal of Ni2+ ions from wastewater and reuse in blood fingerprint enhancement

Nthwane,

Fouda-Mbanga,

Thwala

et al. 2023

J IRAN CHEM SOC

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This study aimed to solve environmental problems, particularly water quality and escalating crime rates. The carbon hollow nanosphere was prepared from orange peels by a reflux method. The carbon hollow nanosphere was coated with Gamma-aluminium oxide (γ-Al2O3 NPs) via the hydrothermal method. The samples were analysed using Fourier-transform infrared spectroscopy, Scanning electron microscopy, Transmission Electron Microscopy, Brunauer–Emmett–Teller, Thermogravimetric analysis, and X-Ray diffraction analysis. The surface area of γ-Al2O3/carbon hollow nanosphere nanocomposite was confirmed to be 578,039 m2/g, and the Ni2+ ions were analysed using ICP-OES. With a maximum adsorption capacity of 56.980 mg/g and a pH 9, batch adsorption experiments revealed that the uptake of Ni2+ ions best fitted the Langmuir adsorption isotherm, and the pseudo-second-order kinetics model effectively described the uptake of Ni2+ ions with a higher R2 of 0.999. Thermodynamic measurements showed the endothermic and spontaneous nature of the Ni2+ ions adsorption using the γ-Al2O3/carbon hollow nanospheres nanocomposite. The adsorbent was then used to identify latent blood fingerprints, and it was discovered that Ni2+-γ-Al2O3/carbon hollow nanosphere generated clear images of blood fingerprints on different substrates. Graphical abstract

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Enhanced sequestration of Cr(VI) onto plant extract anchored on carbon-coated aluminium oxide composite

Cited by 13 publications

References 86 publications

Adams-Bohart, Yoon-Nelson, and Thomas modeling of the fix-bed continuous column adsorption of amoxicillin onto silver nanoparticle-maize leaf composite

Adams-Bohart, Yoon-Nelson, and Thomas modeling of the fix-bed continuous column adsorption of amoxicillin onto silver nanoparticle-maize leaf composite

Adsorption mechanism and modeling of radionuclides and heavy metals onto ZnO nanoparticles: a review

Novel synthesis of γ-Al2O3/carbon hollow nanosphere nanocomposite for the optimal removal of Ni2+ ions from wastewater and reuse in blood fingerprint enhancement

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