Abstract
A series of SiO2/HPC/Zn composites were synthesized by sol-gel method with subsequentially thermal treatment in order to obtain SiO2/ZnO nanocomposites. Hydroxypropyl cellulose (HPC), tetraethyl ortosilicate (TEOS) were used for preparation of amorphous matrix, and zinc was added as Zn(NO3)2*6H2O. The synthesized composites were annealed at 600 °C for 3 h, and X-ray diffraction (XRD) analysis shown the formation of two phases: amorphous silica network and ZnO. The structure of the samples was investigated by infrared (IR), Raman, ultraviolet and visible (UV–Vis) and photoluminescence (PL) spectroscopies. The presence of oxygen vacancies in different ratio in the network structure of the obtained composites was proposed. The photocatalytic ability of obtained composites was tested against malachite green (MG) dye under UV radiation. The highest degradation ability was obtained for the SiO2/10 wt.% ZnO composite. It was found that the increased photocatalytic activity is due to the presence of a more deformed structure with oxygen vacations as well as the presence of ZnO nanoparticles.
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