Highly Dispersed Nanocomposite of AgBr in g-C₃N₄Matrix Exhibiting Efficient Antibacterial Effect on Drought-ResistantPseudomonas putidaunder Dark and Light Conditions

Abstract

Synthesis of nanocomposites possessing intimately mixed components is highly challenging to bring out the best possible properties of the materials. The challenge is mainly due to the difficulties associated with controlling the phase segregation of individual components as a result of high interfacial tension between them and cohesive forces within each component during the synthesis. Here, we show a single-step synthesis of representative nanocomposites of g-C 3 N 4 /AgBr through a rationally designed approach, wherein melamine, the precursor of g-C 3 N 4 , has been intimately mixed with the AgBr precursor, silver− tetraoctylammonium bromide. Subsequent calcination of the obtained solid at 500 °C has resulted in the formation of highly dispersed g-C 3 N 4 /AgBr. The key to such a high dispersion lies in the surfactant-based AgBr precursor that minimized the interfacial tension during the process. The AgBr content has been varied between 2 and 20 wt % with respect to the g-C 3 N 4 content. The obtained nanocomposites have been thoroughly characterized using XRD, XPS, ED-XRF, FE-SEM, HR-TEM, DRS, TCSPC, and BET surface area techniques. The studies revealed a high dispersion of AgBr in the g-C 3 N 4 matrix. The nanocomposites have been found to exhibit remarkable antimicrobial properties over a droughtresistant bacterial strain of Pseudomonas putida under both dark and light conditions compared with similar compositions obtained through other methods reported so far. The present study offers a new approach for synthesizing highly dispersed and efficient nanocomposites.

Room temperature deep UV photoluminescence from low dimensional hexagonal boron nitride prepared using a facile synthesis

“…The small shoulder peak arising at 285.56 eV can be attributed to C-O bond which could be from the adsorbed oxygen on the surface of h-BN. 53 The most dominant peak for boron is ∼ 190.56 eV which is very close to the ideal value of boron position in hexagonal boron nitride. 54 This peak corresponds to the B-N bond in h-BN.…”

2D/2D Nb3O7F/g-C3N4 Heterojunction Photocatalysts with Enhanced Hydrogen Evolution Activity

“…Survey spectra in Figure a show the existence of Nb, O, and F elements in NOF/CN-0.1 samples, C and N elements in CN samples, and C, N, Nb, O, and F elements in the NOF/CN-0.1 sample, which is well in agreement with XRD and EDS results. As illustrated in Figure b, narrow-scanned C 1s spectra in CN nanosheets and NOF/CN-0.1 composites indicate that the peaks at 284.8, 286.3, 288.3, and 289.3 eV can be assigned to C–C, C–N–C, N–CN, and O–CO, respectively. , In Figure c, the peaks at 398.7, 399.8, and 400.8 eV in the narrow-scanned N 1s spectra can be indexed to C–NC, N–(C) 3 , and C–NH, respectively . From narrow-scanned Nb 3d spectra in NOF/CN-0.1 hybrids (Figure d), it can be found that binding energy shifts to a lower position with 0.2–0.3 eV compared to pure NOF, indicating the strong interaction or the formation of a heterojunction between the two components.…”

“…25,26 In Figure 5c, the peaks at 398.7, 399.8, and 400.8 eV in the narrow-scanned N 1s spectra can be indexed to C−NC, N− (C) 3 , and C−NH, respectively. 27 From narrow-scanned Nb 3d spectra in NOF/CN-0.1 hybrids (Figure 5d), it can be found that binding energy shifts to a lower position with 0.2−0.3 eV compared to pure NOF, indicating the strong interaction or the formation of a heterojunction between the two components. In Figure 5e, the peaks at 530.1 and 531.8 eV can be ascribed to lattice oxygen and adsorbed oxygen.…”

Graphite Carbon Nitride and Its Composites for Medicine and Health Applications

“…In the 3‐Ag/g‐C 3 N 4 material prepared by Wei et al., [21] the hydrogen ions at the valence band of g‐C 3 N 4 plays a leading role in the photocatalytic disinfection of Escherichia coli and nanosilver particles suppress the recombination of photogenerated electrons and hydrogen ions, and further enhancing the photocatalytic performance of g‐C 3 N 4 . Balapure et al [22] . synthesized g‐C 3 N 4 /AgBr nanocomposites in the materials containing silver halide.…”