CYCLIC PHOTOCATALYTIC REGENERATION OF SORBENT, BASED ON CARBON NITRIDE (G-C3N4) INCORPORATED IN SILICA NET STRUCTURE

1,2 MANČÍK Pavel
Co-authors:
1,2 BEDNÁŘ Jiří 2 SVOBODA Ladislav 1,2,3 DVORSKÝ Richard
Institutions:
1 Nanotechnology Centre, VSB - Technical University of Ostrava, Ostrava, Czech Republic, EU
2 IT4Innovations, VSB - Technical University of Ostrava, Ostrava, Czech Republic, EU
3 Regional Materials Science and Technology Centre Centre
Conference:
10th International Conference on Nanomaterials - Research & Application, Hotel Voronez I, Brno, Czech Republic, EU, October 17th - 19th 2018
Proceedings:
Proceedings 10th International Conference on Nanomaterials - Research & Application
Pages:
125-130
ISBN:
978-80-87294-89-5
ISSN:
2694-930X
Published:
28th February 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
8 views / 1 download
Abstract

In this work, we present an advanced preparation method, of photoactive layered graphitic carbon nitride (g-C3N4) incorporated into the silica structure containing zinc ions. This new nanocomposite has enhanced sorption properties and photocatalytic activity due to presence of g-C3N4. Samples with 20 wt.% and 10 wt.% of g-C3N4 were prepared and successfully tested. Specific surface area of nanocomposites was increased from 36 m2/g of pure carbon nitride g-C3N4 to 366 and 320 m2/g of functional composites respectively. The material was prepared by vigorous stirring of aqueous solution of zinc acetate and g-C3N4 within ultrasonic field of power density of 1 kW/L. During the sonication, sodium water glass was added at once to synthesize ZnO-m·SiO2 nanoparticles by precipitation reaction. The dispersion was then rapidly frozen and subjected to vacuum freeze-drying process to obtain powder material, which is easier to handle and more suitable for tests. Prepared nanocomposites were subjected to tests of sorption and photocatalytic degradation of methylene blue dye. Furthermore, samples did undergo four successful cycles of sorption of methylene blue with starting concentration of 1 mg/L followed by photocatalytic regeneration. The sorption capacity of sample with 20 wt.% of g-C3N4 was 0.21 mg/g and after the fourth cycle of regeneration it was restored to 75 % of its original value. The sorption capacity of sample with 10 wt.% of g-C3N4 was 0.18 mg/g and after fourth cycle of regeneration it was restored to 90 % of its original value.

Keywords: Photocatalysis, photocatalytic regeneration, sorption, nanoparticles, graphitic carbon nitride
Scroll to Top