193510.fig.007a
(a)
193510.fig.007b
(b)
193510.fig.007c
(c)
Figure 7: (a) Successive UV-vis spectra for the reduction of 4-nitrophenol into 4-aminophenol with the catalyst of m-MWNTs@Pt in the first cycle. (b) The linearized data for first-order analysis corresponding to (a). (c) The calculated values of kobs in the fifteen successive cycles of reduction and magnetic separation with the catalyst of m-MWNTs@Pt.