Effect of MoS 2 on phenol decomposition in water after high-voltage pulse discharge treatment

Molybdenum disulfide (MoS ) was added to the system after being treated with high-voltage pulse discharge plasma to improve the degradation efficiency of pollutants and reduce energy consumption. The discharge plasma-treated solution contains hydrogen peroxide and metal iron ions, and MoS addition can cause co-catalytic Fenton reaction. The effects of discharge time, initial pH, phenol concentration, MoS dosage, discharge voltage, and gas type on phenol removal and aqueous H O concentration were mainly investigated. Results showed that the addition of MoS after plasma treatment can reduce the plasma treatment time by 70% and maintain or even increase the degradation efficiency of phenol from 40% (after 20 min of discharge plasma) to 92% (after turning off the discharge and dosing with MoS for 30 min). Acidic conditions (pH = 3-4) and oxygen were beneficial to phenol removal. MoS addition greatly improved the catalytic oxidation of discharge plasma. This study provides a promising direction for water treatment based on plasma technology.