Preparation and Pb(Ⅱ) Adsorption Characteristics of the Fibers from Laian Malus asiatica Fruit Pomace
Article
Figures
Metrics
Preview PDF
Reference
Related
Cited by
Materials
Abstract:
In order to explore the physicochemical and functional properties of three kinds of fiber samples, namely WF, AF and AKF, were extracted from Malus asiatica fruit pomace using water, 1.25 g/100 mL hydrochloric acid and 1.25 g/100 mL sodium hydroxide solution. Based on the analysis of the main physicochemical and functional properties of original fruit pomace and derived fiber samples, their Pb(Ⅱ) adsorption properties and mechanism were analyzed and compared. The result shows that the fruit pomace of Malus asiatica contained 27.64 g/100 g crude fiber, and the crude fiber contents in the WF, AF and AKF samples were 48.60, 54.14 and 64.72 g/100 g, respectively. The results of Pb(Ⅱ) adsorption experiments shows that the three fiber samples from fruit pomace had similar adsorption properties. Within the concentration range of 1~ 4 μg/mL, with the increase of the initial Pb(Ⅱ) concentration, both the equilibrium adsorption capacity and adsorption rate increased significantly (P≤0.05). When the initial concentration was 4 μg/mL, the AKF had the highest equilibrium adsorption capacity and adsorption rate (which were 394.86 μg/g and 33.18 μg/min, respectively), followed by AF, with the WF being the lowest. The results of adsorption kinetics and thermodynamics tests showed that the adsorption processes of Pb(II) by the three fibers from the fruit pomacewere more in line with a quasi-second-order kinetic model, with chemical adsorption being the main adsorption mode. The adsorption process was an exothermic reaction, with an appropriate low temperature being conducive to the adsorption. The results showed that fibers from Laian Malus asiatica fruit pomace have good water- and oil-absorption properties, and a strong adsorption ability for Pb(II) in aqueous solutions, which will lead to good application prospects in the fields of functional food additives and water treatment.
