▎ 摘　　要

Design and assembly of a novel sustainable unique nanocomposite with multi-purpose activities with efficient adsorptive removal behavior toward different organic, inorganic and biological pollutants is a challenging aspect. Therefore, the current work is directed to prepare graphene quantum dots (GQDs) from mango peels via a facile method. GQDs were coupled with Fe-Al double layered hydroxide (FA-DLH) and intercalated via coprecipitation with gemifloxacin antibiotic (Gem) for the formation of a 3D structure with multiple functional nanocomposite (GQDs@Gem@FA-DLH). This was utilized for various pollutants removal including lead (Pb(II)), 4-nitroaniline (4NA), Enterococcus faecalis (E. faecalis) and Escherichia coli (E. coli)). GQDs@Gem@FA-DLH was characterized from FT-IR, EDX, HR-TEM, BET, XRD and TGA techniques. The maximum removal of 4NA and Pb (II) were established as 90.7% (pH 2.0) and 98.8% (pH 6.0), respectively. The adsorption performance by GQDs@Gem@FA-DLH was favored according to Langmuir and pseudo-second order. Furthermore, the antibacterial removal activity against gram-positive (E. faecalis) and gram-negative (E. coli) by GQDs@Gem@FA-DLH was assessed using two different methods, minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) and the removal percentages reached to 91.3% and 82.9%, respectively. Moreover, the removal of bacteria from wastewater based on the total plate count was established as 80%.