The used dyes are chemically stable and are common constituents of effluents
in CYT387 datasheet industries which demand an appropriate method to dispose them off. As shown in Figure 4a,b,c, we can see that the peak intensities at 554 nm Saracatinib manufacturer for RhB, 664 nm for MB, and 525 nm for Rh6G decreased very quickly once the hollow [email protected] were added. After only 45 min, these peaks became too weak to be observed, suggesting the high efficiency for removing these three dyes. Meanwhile, the insets of Figure 4a,b,c shows the change of the color of these three dyes in solution within 45 min. It can be seen that the color of the three dyes disappeared, suggesting that the chromophoric structure of RhB, MB, and Rh6G were decomposed. However, for the removal of MO, the color of the MO solutions did not disappear in 45 min (Figure 4d). This means that a part of the molecular structure of MO was not decomposed by [email protected] and remained in the solution. Figure 4 UV-vis absorption spectra. RhB (a), MB (b), Rh6G (c), and MO (d) when the hollow [email protected] nanoparticles were present at different times (the insets are the photos of their
dyes before and after being treated with the as-synthesized [email protected] nanoparticles). The adsorption kinetics and adsorption isotherm with the corresponding dyes (e) and the comparison absorbance (f) for the removal rate of [email protected] hollow nanoparticles (the concentration of dyes is as PRN1371 mw follows: RhB 10 mg/L, MB 5 mg/L, Rh6G 5 mg/L,
and MO 5 mg/L). Figure 4e,f further confirms that the removal rate of RhB (10 mg/L) can reach to 94.6%. The results reveal that the as-prepared hollow [email protected] nanoparticles exhibit excellent removal performance for RhB dyes. Meanwhile, the hollow [email protected] nanoparticles also showed a good removal Etofibrate performance for MB and Rh6G (5 mg/L); the removal rate can reach to 99.9% and 92.3%, respectively. However, for the MO dyes (5 mg/L), the removal rate can only reach to 41.2%, because the chromophoric structure of MO dye is different from those of RhB and MB, and this will cause a different electrostatic interaction capacity between functional groups of carbon and dye molecules [18–20]. The above results illustrate that the as-obtained hollow [email protected] nanoparticles exhibit a good dye removal performance. To further study the dye removal abilities of the as-prepared hollow [email protected] nanoparticles, the dye removal performance of naked hollow SnO2 nanoparticles and commercial SnO2 nanoparticles (average size is 70 nm) was measured for comparison. Figure 5a shows the time-dependent adsorption kinetics of the samples at different initial RhB dye concentrations. Obviously, among all the samples, the hollow [email protected] nanoparticles (samples S2 and S5) exhibit the fastest absorption abilities. As shown in Figure 5b, the removal rate of the hollow [email protected] nanoparticles (S2) is highest among the three samples and can reach to 96.3% and 94.