Dye Degradation, Antimicrobial Activity, and Molecular Docking Analysis of Samarium‐Grafted Carbon Nitride Doped‐Bismuth Oxobromide Quantum Dots

Abstract

Various concentrations of samarium‐grafted‐carbon nitride (Sm‐g‐C3N4) doped‐bismuth oxobromide (BiOBr) quantum dots (QDs) are prepared by the co‐precipitation method. Elemental evaluation, morphological, optical, and functional group assessment are studied employing characterization techniques. Based on the XRD pattern analysis, it is determined that BiOBr exhibits a tetragonal crystal structure. The electronic spectroscopy revealed an absorption peak for BiOBr at 315 nm and the bandgap energy (Eg) decreasing from 3.9 to 3.8 eV with the insertion of Sm‐g‐C3N4. The presence of vibrational modes related to BiOBr at 550 cm−1 is confirmed through FTIR spectra. TEM revealed that pure BiOBr possessed non‐uniform QDS, and agglomeration increased with the addition of Sm‐g‐C3N4. The catalytic performance of Sm‐g‐C3N4 into BiOBr (6 mL) in a neutral medium toward rhodamine B exhibited excellent results (99.66%). The bactericidal activity is evaluated against multi‐drug resistance (MDR) Escherichia coli once the surface area is increased by dopant and the measured inhibition zone is assessed to be 3.65 mm. Molecular docking results supported the in vitro bactericidal potential of Sm‐g‐C3N4 and Sm‐g‐C3N4 doped‐BiOBr as DNA gyraseE. coli inhibitors. This study shows that the novel Sm‐g‐C3N4 doped‐BiOBr is a better catalyst that increases specific semiconductor's catalytic activity (CA).

Exploring the decolorization efficiency and biodegradation mechanisms of different functional textile azo dyes by Streptomyces albidoflavus 3MGH

“…During incubation, aliquots of 3 mL culture medium were withdrawn after 3-, 5-, and 7days of incubation, then centrifuged at 5,000 rpm for 15 min to separate the cell mass, followed by filtration through a 0.45 μm syringe filter to remove any suspended particles. The decolorization of the dyes was assessed using a UV spectrophotometer by measuring the change in absorbance of the decolorization medium at 500 nm for reactive orange (122), 602 nm for direct blue (15) and 520 nm for direct black (38) against uninoculated control samples [ 61 – 63 ]. All decolorization experiments were done in three independent replicates.…”

Facile synthesis of silver doped manganese oxide nanocomposite with superior photocatalytic and antimicrobial activity under visible spectrum

“…In recent years, the problem of bacteria antibiotic resistance to traditional antibiotics has reached a critical level 10 . The world population would be facing a real possibility of post-antibiotic era, where common infections and minor injuries could become life-threatening.…”