Effect of soluble organic matter on the physicochemical properties of black carbon in marine diesel engines

In the present study, the effects of soluble organic matter (SOF) on the physicochemical properties were revealed to enrich the black carbon (BC) reprocessing strategy for marine engines. The SOF content, oxidation reactivity, graphitization degree, primary particle diameter (Dp) and nanostructure were analyzed by thermogravimetric analysis (TGA), Raman spectrometer and high-resolution transmission electron microscopy (HRTEM). The results showed that the particles with higher SOF content had larger Dp values, lower graphitization degree and higher oxidation reactivity. Based on SOF would adsorb on the BC surface and increase the adhesion between the particles in the cylinder, a quantitative correlation between SOF content and the physicochemical properties of BC was derived. Meanwhile, the SOF inside the particles formed a porous structure, which improved the oxidation reactivity. In summary, the results of this study are important for a deeper understanding of the nature of marine engine particles and the reduction of nanoparticulate emissions.