Soda-anthraquinone pulping and cationization of Posidonia oceanica

Abstract

Every year, millions of tonnes of dead biomass from algae and seagrasses are collected on the Mediterranean coasts. Posidonia oceanica is one of the most abundant species. In this work, leaves and rhizomes from this plant were pulped, alkalized, and cationized to make a value-added product. The main effects of five separate pulping variables, namely temperature, time, NaOH concentration, anthraquinone, and liquid-to-solid ratio were studied. The total procedure to produce cationic fibers took only 3 h (approximately), which made it a feasible process. A pseudo-second-order rate equation was used to fit the results of chemical modification via incorporation of quaternary ammonium ions. Characterization involved X-ray diffraction, scanning electron microscopy, and elemental analysis. The authors found that mild conditions were enough to achieve good results, reaching degrees of substitution of 0.20 for leaves and 0.12 for rhizomes.

Immobilization of TiO2 Semiconductor Nanoparticles onto Posidonia Oceanica Fibers for Photocatalytic Phenol Degradation

“…The SEM images of POF and POF/TiO2 are shown in Figure 2a-f, respectively. The pure fibers have a long uniform length and a fibrous structure (Figure 2a) as confirmed by other researchers [29][30][31]. After the modification of POF by the sol-gel method, a well-fixed thin film of TiO2 is formed (Figure 2d-f).…”

Resource recovery and reduction of tidal waste through clean processes to obtain cellulose

“…Marine phanerogams are composed by leaves, rhizomes, roots, owers, and fruits. The parts of less weight and volume (roots, owers, and fruits) with a part of the dead leaves are dragged by the waves to deeper areas while the parts of more weight and volume (leaves and rhizomes) are transported and accumulated on the coast generating residues (Moral et al 2019). For species identi cation, a bibliographic search to know the differences between the species constituting these residues was carried out (Table 2).…”