Linan Zhu

Removal of Nitrobenzene in Water by High Voltage Pulsed Discharge

The removal effect of Nitrobenzene in water by high voltage pulsed discharge was investigated. The high energy was injected into water, which could induce many chemical chain reactions. The active species could generate during the discharge course. With the conditions of increasing the discharge voltage and reducing the initial concentration of nitrobenzene, the removal rate of nitrobenzene increased, which was beneficial to practical application.

Energy Efficiency in High Voltage Pulsed Discharge

The effect of plasma produced and the power energy efficiency on the generation of hydrogen peroxide in high voltage discharge process were investigated. The energy put into the discharge region was used to generate active radicals, then to form hydrogen peroxide and nitrate. With increasing the voltage, the energy efficiency of hydrogen peroxide production decreased. While increasing air flow rate could improve the energy efficiency, which was beneficial to practical application.

Effect of Loaded Pellets in High Voltage Pulse Discharge

The effect of loaded pellets in high voltage pulse discharge was investigated. There were some changes in the surface characteristics of different pellets with loaded catalysts. The specific surface area of the pellet loaded with ferric hydroxide increased and the pellet loaded with titanium dioxide decreased. Pore volume and pore size of loaded pellets were small. The adsorption of phenol on the loaded pellets was little. Air and oxygen aeration promoted the phenol degradation. Titanium dioxide and ferric hydroxide loaded on the surface of activated alumina could react with ozone and catalyze ozone decomposition to produce hydroxyl radicals, which accelerated the degradation of organic matter.

Effect of Different Catalysts in Hybrid Gas-Liquid Discharge for the Removal of Organic Pollutant

Hybrid gas-liquid discharge technology is a promising water treatment technology. The synergic effect of activated alumina and discharge electric field could accelerate the removal of organic pollutants. Effect of loaded catalysts on the organic pollutant removal rate in hybrid gas-liquid discharge was investigated by loading FeOOH and nanosize TiO2 on the surface of activated alumina particles. The results revealed that activated alumina particles loaded by nanosized TiO2 in hybrid gas-liquid discharge electric field exhibited preferable catalytic capability and received higher phenol removal rate. This was because that the ultraviolet radiation produced in discharge course catalyzed TiO2 to form cavity, then OH was generated through the reaction with H2O or OH- adsorbed on the surface. The amount of OH was increased, which enhanced the phenol removal rate.