TiO2NPs Embedded in Chitosan Membrane for Efficient Photodegradation of Various Dyes

Abstract

Synthesis of a new chitosan/TiO 2 NPs nanocomposite was conducted, TiO 2 was used as photocatalyst in combination with chitosan which act as co-adsorbent and an immobilization agent. They were used under UV source for photodegradation of anionic and cationic, as well as for removing neutral dyes dissolved in water. Several techniques like scanning electron microscope (SEM) and energy-dispersive X-ray (EDAX) spectroscopy, together with Fourier-transform infrared spectroscopy (FT-IR) analysis and swelling ratio were all used in characterising the fabricated membranes. The incorporation of TiO 2 NPs in the chitosan network was revealed by FT-IR analysis. The confirmation of their spherical shape and nanoparticles was made by SEM. The dyes were completely eliminated under UV light in this order of CS, CS/Low TiO 2 NPs, CS/Mid TiO 2 NPs, and CS/High TiO 2 NPs.

Formation of plasmonic core/shell nanorods through ammonia-mediated dissolution of silver(i)oxide for ammonia monitoring

“…The detection limit of ammonia in the present study is lower than the reported methods. 1,[31][32][33][34][36][37][38][39] Most reports do not provide visual detection 1,[30][31][32][33][34]36,39 or clear color differentiation. 35,38 In the present study, the color changes of the sensor in the absence and presence of different ammonia concentrations are completely different and can be easily detected by the naked eye.…”

“…However, in the current research, there is no need to modify or functionalize the surface of the nanoparticles. Moreover, some reports are based on specic fruits and plants, 31,33,36 which are only cultivated in a few countries. Therefore, they are expensive and not available.…”