Nanocomposites and nanomaterials

Bio-SiO2 from agriculture residue
T.V. Tkachenko, V.A. Yevdokymenko, D.S. Kamenskyh, Y.V. Sheludko, V.A. Povazhny, V.I. Kashkovsky
V.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry of the NAS of Ukraine, Murmanskaya str, 1, Kyiv-94, 02094, Ukraine.
E-mail: ttv13ttv@gmail.com 

Plant-based biogenic silicon dioxide nanoparticles used to produce catalysis, additives, templates for deposition of other semiconductors and metals, nanomaterials with novel properties, bio-nanocomposites for biomedical, energy and environmental fields. There were too many ways of bio-SiO2 production. Dependent on the way and obtaining condition some properties of the plant-based biogenic silicon dioxide nanoparticles were changed. The most silicon reaches local biomass are rice, buckwheat and oats (stalks and husk). 
The aim of our work was the investigation of physic-chemical properties of the obtained bio-silicon dioxide from the rice husk.
The fluoric technology was used for silicon dioxide isolation [1]. It allows recycling raw materials into the work cycle. Thus this technology is ecologically and economically efficient.
The synthesised SiO2 were analysed for morphology and composition using different methods: low-temperature nitrogen sorption-desorption, XRD, XRF, FTIR-ATR, SEM-EDS, ICP-MS.
It was established that obtained samples had a specific surface area 107 m2/g and pore size 1,2-10 nm. The XRD of the powdered SiO2 showed characteristic features of 100 % amorphous materials. FTIR, XRF SEM-EDS, ICP-MS and X-ray diffraction indicated that samples contain only SiO2. There were 90.9 % particles with size less than 10 µm. 
The catalytic experiments and laboratory installation assembling have been funding by Target Complex Program of Scientific Research of NAS of Ukraine from the development of scientific principles of rational use of natural resource potential and sustainable development, project 14, 2015-2019.

1.	Yevdokymenko V.A., Kamenskyh D.S., Kashkovsky V.I., Vakhrin V.V. Method of producing amorphous silicon dioxide from the rice husk. // Pat. UA 123656. Publ. 12.03.2018. 5p.