TiO2/carbonaceous nanocomposite from titanium-alginate coordination compound.

TiO2-based materials have been developing rapidly as eco-friendly photocatalysts, but the inherent defects limited their application, such as rapid recombination of photogenerated electrons and wide bandgap. To obtain high-efficient TiO2/carbonaceous photocatalysts (TiO2/C), we prepared the nanocomposite by carbonizing titanium alginate coordination compound and studied their photocatalytic performance against methylene blue (MB) under simulated sunlight irradiation. The resultant nanocomposites were characterized by FT-IR, XPS, XRD, SEM-EDS, TG-DTG, UV-DRS, and N2 adsorption-desorption analysis. The carbon mainly existed in the outer layer of TiO2/C composites, contributing to the optical sensibilization. As a result, the degradation efficiency of sample TiO2/C-20 to MB could reach 97.47% within 15 min under simulated sunlight. The samples also possessed high stability, proved by the 0.72% reduction in photodegradation ratio after five cyclic tests. The present study proved the feasibility of preparing photocatalyst from titanium-alginate coordination compound and provided an extensible approach for preparing high-efficiency photocatalysts from a polysaccharide-based coordination compound.