Electrochemical synthesis and tribological properties of flower-like and sheet-like MoS2 in LiCl KCl (NH4)6Mo7O24KSCN melt

Amphiphilic ligand in situ assembly of uranyl active sites and selective interactions of molybdenum disulfide

Removal of radioactive uranyl ions (UO₂²⁺) from water by effective adsorbents is highly desired but remains a challenge. UO₂²⁺ are easily combined with H₂O, and the polarization of H₂O affects the complexation between UO₂²⁺ and the adsorbent. Thus, it is necessary to reconstruct the UO₂²⁺ active site to improve the adsorption capacity. Herein ，an amphiphilic ligand, namely N, N-dimethyl-9-decenamide (NND), is successfully prepared. NND replace H₂O in [UO₂(H₂O)₅]²⁺ by hydrogen bonding, thereby enhancing the adsorption capacity of MoS₂ particles in the reconstituted UO₂²⁺ active sites. The predicted maximum adsorption capacity increased from 50.7 to 500.7 mg g^- 1 (by a factor of 9.87) with the presence of NND, which is higher than other functional group-modified MoS₂ adsorbents. Furthermore, NND and MoS₂ can retain UO₂²⁺ uptake under extreme conditions including high acid-base and gamma irradiation. Theoretical Calculations of NND through H bonding produces an increased amount of charge transfer and a reduced adsorption energy between UO₂²⁺ and MoS₂, which weakens the polarization effect of H₂O. The findings showed that NND appeared to be a promising amphiphilic to improve the adsorption efficiency of UO₂²⁺ from water.

A green electrolysis of silver-decorated MoS2 nanocomposite with an enhanced antibacterial effect and low cytotoxicity

To tackle the devastating microbial infections for the public health, a continuous search for effective and safe nanobiocides based on their prominent nanoscale effects has been extensively explored during past decades. In this study, a green electrolysis method was employed to synthesize silver-doped molybdenum sulfide (Ag@MoS₂) composite materials. The obtained nanocomposites exhibited a sheet-like structure with a large specific surface area, which contributed to the efficient loading and refined distribution of silver nanoparticles. G^- E. coli and G ⁺ S. aureus were used as model bacteria for the antibacterial test, which revealed enhanced antibacterial activity of produced nanocomposites with an identified destructive effect on preformed biofilms. It was found that within 72 hour incubation, 20 μg mL^-1 Ag@MoS₂ was sufficient to inhibit the growth of E. coli and S. aureus without visible colony formation, pointing to a desirable long-term antibacterial activity. Further a mechanistic antibiosis study of Ag@MoS₂ indicated the involvement of a generation of reactive oxygen species. Notably, owing to the well-distributed silver nanoparticles on the nontoxic MoS₂ nanosheet, the cytotoxicity evaluation results revealed that produced nanocomposites exhibited negligible toxicity to mammalian cells, and thereby held promising potential for biomedical applications.