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Nanomaterials 2019, 9, 1042 Nanomaterials 2019, 9, x FOR PEER REVIEW 2 1 0 Figure 2. UV-Vis spectra of AgNPs generated from different precursor concentrations (samples Figure 2. UV-Vis spectra of AgNPs generated from different precursor concentrations (samples were were diluted 60 times). Inset shows changes in SPR, indicating an increase in size with increasing diluted 60 times). Inset shows changes in SPR, indicating an increase in size with increasing concentration. AgNPs diluted 30 times produced from 2, 4, 6, 8, 10, 15, and 20 mM precursor concentration. AgNPs diluted 30 times produced from 2, 4, 6, 8, 10, 15, and 20 mM precursor concentration (from left to right). concentration (from left to right). Table 1. Characteristics of AgNPs synthesized at various precursor concentrations. Samples were Table 1. Characteristics of AgNPs synthesized at various precursor concentrations. Samples were λmax FWHM Amax λmax FWHM 4130.514139090 411 82 4140.894118482 4141.254148184 415 423 431 diluted 60 times. diluted 60 times. AgNO3 Concentration (mM) Amax AgNO3 Concentration (mM) 22 0.51 7 of 20 7 of 20 Absorbance 300 400 500 Wavelength (nm) 2 mM 4 mM 6 mM 8 mM 10 mM 15 mM 20 mM 600 700 800 4 64 86 10 8 15 10 20 15 20 0.89 1.25 1.55 1.34 1.04 0.83 414 105 81 415 154 105 1.55 1.34 1.04 423 154 0.83 431 199 199 3.2.2. Time Course Study The time course experiment was performed to ascertain the appropriate reduction time required 3.2.2. Time Course Study for the generation of AgNPs. Since 6 mM was determined as the optimal precursor concentration in The time course experiment was performed to ascertain the appropriate reduction time the earlier experiment, the same was used in this study. The UV-Vis spectrum was recorded after every required for the generation of AgNPs. Since 6 mM was determined as the optimal precursor few hours to check the progress of the synthesis. The increase in absorption of UV-Vis spectrum with concentration in the earlier experiment, the same was used in this study. The UV-Vis spectrum was time is shown in Figure 3. The synthesis of nanoparticles rapidly progressed for the first 6 h and then recorded after every few hours to check the progress of the synthesis. The increase in absorption of the increase was very subtle. After 12 h, the absorbance increased slightly, thereby indicating that UV-Vis spectrum with time is shown in Figure 3. The synthesis of nanoparticles rapidly progressed the reaction was coming to an end. Therefore, it can be concluded that near-complete reduction was for the first 6 h and then the increase was very subtle. After 12 h, the absorbance increased slightly, achieved at around 24 h, as judged by the very slight increase in absorbance at later stages around 36 h. thereby indicating that the reaction was coming to an end. Therefore, it can be concluded that No significant changes were observed in the UV-Vis spectrum thereafter. Thus, 24 h was considered the near-complete reduction was achieved at around 24 h, as judged by the very slight increase in minimum time required to achieve an acceptable degree of reduction for AgNP production. Following absorbance at later stages around 36 h. No significant changes were observed in the UV-Vis the optimization studies, 6 mM AgNO3 and 24 h were chosen as the optimum precursor concentration spectrum thereafter. Thus, 24 h was considered the minimum time required to achieve an acceptable and time, respectively. All further experiments were performed with the nanoparticles obtained using degree of reduction for AgNP production. Following the optimization studies, 6 mM AgNO3 and 24 the optimum conditions along with 0.5 g/L pigment. h were chosen as the optimum precursor concentration and time, respectively. All furtherPDF Image | Biosynthesis of Silver Nanoparticles Talaromyces purpurogenus
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