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    Bentonite-PDMS composite foams for oil spill recovery: Sorption performance and kinetics

    Year: 2022

    Journal: J. Appl. Polym. Sci., Volume 139, NOV 5

    Authors: Piperopoulos, Elpida; Calabrese, Luigi; Jovanovic, Vesna Stankov; Nikolic, Jelena; Ciric, Slobodan; Milone, Candida; Proverbio, Edoardo

    Organizations: Ministry of Education, Science and Technological Development, Republic of Serbia [451-03-68/2022-14/200124]

    Keywords: bentonite; oil recovery; oil; water selectivity; siloxane foam; sorption kinetics

    The aim of this article is the synthesis and characterization of bentonite-filled siloxane foams for oil spills recovery. Composite foams at varying filler content in the range 35-45 wt% were investigated. The sorption kinetics and capacity of composite foams in different oils (e.g., kerosene, virgin naphtha, pump oil) were assessed. As a reference, water absorption capacity was also evaluated. Among all, the composite foam filled with 40 wt% bentonite (B-40 batch) shows the lowest affinity with water and good absorption capacity with oils (mainly light oils) reaching an absorption capacity at saturation equal to 10.3 and 518.2 wt% in water and virgin naphtha, respectively. Furthermore, isothermal absorption curves were analyzed using three kinetic models: pseudo-first order, pseudo-second order, and Elovich models. The equilibrium isotherm fitting results were optimal using the pseudo-second order model, indicating that chemisorption phenomena play a key role in the speed of the absorption phase for these PDMS-based composite foams. Finally, a correlation was addressed between morphology, foam microstructure, absorption capacity, and kinetics.
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