generator is adjusted to an appropriate current. Measurement of
process temperature was done by platinum temperature sensor
connected to data acquisition system (temperature accuracy of
±0.5 ◦C), and this was linked to proportional-integral-derivative
(PID) controller (TCG-6061, HUAYOU) for continuous recording of
data. The platinum temperature sensor was inserted into the reaction
solution and an infrared temperature detector was held just
above the reaction solution. However, the infrared temperature