Fig. 2. (a) The interior pressure of the flask before and after reaction for 10 h under an O2 atmosphere. XPS S 2p spectra of the reaction mixture with reaction times of 2 h (b), 8 h (c), and 10 h (d). (e) Time-dependent UV-vis absorption spectra of the reaction mixture after diluting 1000 (e) and 60 times (f) with water. Inset of (f): photographs of the reaction mixture with different reaction times.
