The experimental set-up consisted of a
three-necked glass flask, containing the reaction solution, placed in
the microwave cavity (350 mm
×
215 mm
×
330 mm) or in a water
bath in case of the control test. An overhead stirrer was placed
inside the reaction solution through a central hole at the top of
the three-necked glass flask. The microwave power was selected at
a linear adjustable level (0–800 W) and for various exposure times
(0–99 h).
Different microwave powers were produced by altering the
anode current supply of the microwave generator transformer
(Fig. 1B). Thus, in order to generate a microwave with a desired
microwave power density, the anode current of the microwave