Biological mediated Ag nanoparticles from Barleria longiflora for antimicrobial activity and photocatalytic degradation using methylene blue

Figures & data

Figure 1. (a) Particle size distribution image of synthesized Ag-NPs, (b) UV-Visible spectrum of Barleria longiflora L extracts and synthesized Ag-NPs, (c) XRD pattern, d) FTIR analysis of the synthesized Ag-NPs.

Figure 2. (a) FESEM, (b) EDX spectrum, (c-d) TEM, (e) SAED pattern image of synthesized Ag-NPs.

Figure 3. Antibacterial activity of Ag-NPs against human pathogens (a) Enterococcus sp., (b) Streptococcus sp, (c) Bacillus megaterium, (d) Pseudomonas putida (e) Pseudomonas aeruginosa, (f) Staphylocouus aureus. Concentration of Ag-NPs – 50, 75 and 100 µl; P.E- leaf extract.

Table 1. Antibacterial activity of the synthesized nanoparticles from Barleria longiflora L leaf extracts.

S.No	Name of the pathogens	Zone of inhibition (mm) Concentration of Ag-NPs (µg ml^−1)
		50 µl	75 µl	100 µl	Plant extract	Chloramphenicol
1	Bacillus megaterium	14 ± 0.08	15 ± 0.32	14.5 ± 0.15	1 ± 0.12	35 ± 0.057
2	Streptococcus sp.	12 ± 0.12	13.5 ± 0.058	15.5 ± 0.18	0	26 ± 0.16
3	Enterococcus sp.	13 ± 0.21	16 ± 0.06	18 ± 0.09	0	33 ± 0.08
4	Staphylocouus aureus	14 ± 0.08	14.5 ± 0.15	14.5 ± 0.08	0	24 ± 0.09
5	Pseudomonas putida	14.5 ± 0.14	17 ± 0.1	17 ± 0.7	0	24 ± 0.13
6	Pseudomonas aeruginosa	15 ± 0.18	17 ± 0.09	18 ± 0.14	0	25 ± 0.04

Figure 4. (a) Adsorption spectrum of methylene blue under light irritation, (b) adsorption spectrum of Ag-NPs against methylene blue under light irritation and (c) photocatalytic degradation of methylene blue in the presence Ag-NPs.