So Dye Synthesis Lab Report

2. Experimental
2.1. Synthesis of Bi2S3 nanostructures
All chemicals were analytically pure, purchased from Sigma-Aldrich and used without further purification. In a typical procedure, Bi(NO3)3•5H2O (0.4 mmol) and ribonucleosides such as adenosine (AD), guanosine (GN) and inosine (IN) were directly added into a solution containing Na2S.9H2O (capacity of reaction mixture: 50 mL). Then the reaction mixture was kept on magnetic stirrer under continuous stirring maintaining constant temperature at 60oC for 3 hours. After the thermal treatment, the reaction mixture was air-cooled to room temperature; the precipitates were collected by centrifugation, washed several times with distilled water and absolute ethanol, and then dried in an oven at 120°C

In a typical process, appropriate amounts of SO dye and the catalysts were first mixed in a small amount of distilled water. Then, a certain volume of NaBH4 solution was introduced into the above system to form a 3 mL solution. Here, the concentrations of the SO dye, NaBH4 and the catalyst were 2×10-5 mol L-1, 40 mmol L-1 and 200 mg L-1, respectively. Firstly, the catalytic degradation of SO dye in the absence of Bi2S3 NSs by NaBH4 was studied. A small amount of SO dye was degraded. The enhancement of degradation of SO dye in the presence of Bi2S3 NSs was observed by using NaBH4 as reducing agent. The reducing reaction processes were monitored using a UV-vis

In a typical procedure, the measurement of emission wavelength and quenching study of Bi2S3 NSs were conducted at room temperature. The emission spectra of Bi2S3 NSs have been measured in the absence and presence of Cys. Fluorescence of the mixture was recorded in a quartz cuvette at a fixed excitation wavelength of 350 nm and fluorescence emission wavelength of Bi2S3 NSs was measured. Excitation and emission slits were set as 1.0 and 5.0 nm band-pass. The quenching experiments may give further information about the binding ability of NSs with Cys. Subsequently, for quenching measurements, the appropriate volume of Bi2S3 NSs and a series of Cys standard solutions were added to the 10 ml test tube, diluted by water and homogenized for determination. It was reported that the fluorescence intensity was quenched by the addition of Cys solution. The detection spectra were obtained in the range of 350–650 nm with the excitation wavelength of 350