Investigation of liquid plasma catalysis on Ti electrodes for the decolorization of a brilliant red B solution

This investigation is intended to determine the catalytic effect of liquid plasma on TiO2, generated in situ on Ti anodes submerged in Na2SO4 electrolyte solution by observing the efficiency of the reaction in decolorizing a brilliant red B solution under voltage-stabilized DC power. The orthogonal test was performed in order to obtain the optimal reaction conditions for the test device. When placed under a constant voltage of 550 V, and with an electrode depth of 2 mm, Na2SO4 concentration of 5 g/L, pH of 2, the maximum decolorization ratio of 100 mL brilliant red B solution with the concentration of 20 mg/L was 97.8% after 40 min. The reaction rate constant was about 0.102 min−1, conforming to the first-order reaction kinetic model. Comparative tests were conducted with: Al electrode under 450 V; Mo electrode under 550 V; and a mixture of the electrolyte and TiO2 powder. The results showed that liquid plasma – TiO2 on the electrode of the catalytic system naturally integrated on the discharge electrode, with an increase in reaction rate by 26.8% while utilizing the same energy consumption.

► We build the catalytic system of liquid plasma and TiO2 formed on Ti anode.
► We examine its efficiency on the decolorizing of a brilliant red B solution.
► We compare it with Al anode, Mo anode and electrolyte mixed with TiO2 powder, respectively.
► Liquid plasma – TiO2 catalyzer naturally integrate on the discharge Ti anode.
► Its reaction rate increases by 26.8% under the same energy consumption.