Functionalized Cellulose for the Controlled Synthesis of Novel Carbon–Ti Nanocomposites: Physicochemical and Photocatalytic Properties
Metadatos
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Hamad, Hesham; Bailón García, Esther; Morales Torres, Sergio; Carrasco Marín, Francisco; Pérez Cadenas, Agustín Francisco; Maldonado Hodar, Francisco JoséEditorial
MDPI
Materia
Cellulose decrystallization Phosphorus functionalities Carbon–Ti nanocomposites TiP2O7 crystals Orange G Photocatalysis
Fecha
2020-04Referencia bibliográfica
Hamad, H., Bailón-García, E., Morales-Torres, S., Carrasco-Marín, F., Pérez-Cadenas, A. F., & Maldonado-Hódar, F. J. (2020). Functionalized Cellulose for the Controlled Synthesis of Novel Carbon–Ti Nanocomposites: Physicochemical and Photocatalytic Properties. Nanomaterials, 10(4), 729. [doi:10.3390/nano10040729]
Patrocinador
This work was financially supported by the Spanish Projects ref. RTI2018-099224-B-I00 from ERDF/Ministry of Science, Innovation and Universities—State Research Agency and Junta de Andalucía - Grant ref. RMN-172.Resumen
Carbon–Ti nanocomposites were prepared by a controlled two-step method using
microcrystalline cellulose as a raw material. The synthesis procedure involves the solubilization of
cellulose by an acid treatment (H3PO4 or HNO3) and the impregnation with the Ti precursor followed
of a carbonization step at 500 or 800 ◦C. The type of acid treatment leads to a different functionalization
of cellulose with phosphorus- or oxygen-containing surface groups, which are able to control the
load, dispersion and crystalline phase of Ti during the composite preparation. Thus, phosphorus
functionalities lead to amorphous carbon–Ti composites at 500 ◦C, while TiP2O7 crystals are formed
when prepared at 800 ◦C. On the contrary, oxygenated groups induce the formation of TiO2 rutile at
an unusually low temperature (500 ◦C), while an increase of carbonization temperature promotes a
progressive crystal growth. The removal of Orange G (OG) azo dye in aqueous solution, as target
pollutant, was used to determine the adsorptive and photocatalytic efficiencies, with all composites
being more active than the benchmark TiO2 material (Degussa P25). Carbon–Ti nanocomposites with
a developed micro-mesoporosity, reduced band gap and TiO2 rutile phase were the most active in the
photodegradation of OG under ultraviolet irradiation.