A novel microwave photochemical reactor for the oxidative decomposition of Acid Orange 7 azo dye by MW/UV/H2O2 process

The characteristic features of a novel microwave and UV photoreactor, useful for microwave assisted photochemical processes, are presented by examining the results obtained in the photo decoloration of Acid Orange 7 in an aqueous hydrogen peroxide solution. The advantages over other experimental procedures, like reduced consumption of chemicals, energy saving and simpler setup are highlighted. The method enables to activate a chemical reaction with microwaves and UV radiation using an immersed source without the need of a microwave oven. The principles of functioning of the electrodeless source are given and discussed in terms of the experimental output UV energy, for applied microwave powers from 3 W to 60 W at 2450 MHz. This very efficient technical solution increases the control and yield, enabling the operator to work in safety conditions and using ordinary instruments and devices, also with metal parts, directly connected to the reactor. The method is versatile and the scale up for industrial applications is more feasible.