Co-doping silver and iron on graphitic carbon nitride-carrageenan nanocomposite for the photocatalytic process, rapidly colorimetric detection and antibacterial properties

Abstract Sulfide ions are the main toxic material, and can be polluted the environment by different industrial activity wastes. The detection of S2- ions was conducted by a sensitive and selective method in trace levels from aquatic solution. In this study, the silver/iron on graphitic carbon nitride-carrageenan (Ag/Fe/g-C3N4-Carr) nanocomposites was prepared by chemical synthesis method. The Ag/Fe/g-C3N4-Carr sensor was characterized as structural and optical properties via different analysis devices. The main zeta potential and average particle size of Ag/Fe/g-C3N4-Carr was -30.0 mV and 22 nm, respectively. The interaction time of S2- ions detection with the prepared probe is 1.5 min. The limit of detection of S2- ions was 0.6 nM by Ag/Fe/g-C3N4-Carr with good linearity in 20–60 nM of S2- concentration. The degradation of penicillin G (PENG) was conducted by Ag/Fe/g-C3N4-Carr catalyst under UV light irradiation. The degradation amount of PENG was 99.42% under UV light irradiation in 25 min. The Ag/Fe/g-C3N4-Carr particles depicted the best bactericidal activities.