Application of Granular Biocomposites Based on Homogenised Peat for Absorption of Oil Products

Among the various methods for collecting oil spills and oil products, including from the water surface, one of the most effective is the use of sorbents. In this work, three-component bio-based composite granular adsorbents were produced and studied for oil products' pollution collection. A bio-based binder made of peat, devulcanised crumb rubber from used tyres, and part fly ash as cenospheres were used for absorbent production. The structure, surface morphology, porosity, mechanical properties, and sorption kinetics of the obtained samples were studied. Composite hydrophobicity and sorption capacity to oil products, such as diesel fuel (DF) and motor oil (MO), were determined. The obtained pellets are characterised by a sufficiently pronounced ability to absorb oil products such as DF. As the amount of CR in the granules increases, the diesel absorption capacity increases significantly. The case of 30-70-0 is almost three times higher than the granules from homogenised peat. The increase in q is due to two factors: the pronounced surface hydrophobicity of the samples (Theta = 152 degrees) and a heterogeneous porous granule structure. The presence of the cenosphere in the biocomposite reduces its surface hydrophobicity while increasing the diesel absorption capacity. Relatively rapid realisation of the maximum saturation by the MO was noted. In common, the designed absorbent shows up to 0.7 g center dot g(-1) sorption capacity for MO and up to 1.55 g center dot g(-1) sorption capacity for diesel. A possible mechanism of DF absorption and the limiting stages of the process approximated for different kinetic models are discussed. The Weber-Morris diffusion model is used to primarily distinguish the limiting effect of the external and internal diffusion of the adsorbate on the absorption process.

Automated summary

In this study, three-component bio-based composite granular adsorbents were developed and tested for their effectiveness in collecting oil spills and oil products. The pellets showed a pronounced ability to absorb oil products, especially diesel fuel. The addition of devulcanised crumb rubber significantly increased the diesel absorption capacity, while the presence of cenospheres in the biocomposite reduced its surface hydrophobicity. The designed absorbent demonstrated high sorption capacity for motor oil and diesel.