Enhanced degradation of organic pollutant 4-chlorophenol in water by non-thermal plasma process with TiO2

Abstract

The combined application of TiO 2 photocatalyst and pulsed high-voltage electrical discharge process for the degradation of organic pollutant parachlorophenol (4-CP) in aqueous solution was tentatively investigated. The optimum conditions for 4-CP removal were applied voltage at 14 kV, electrode distance at 2 cm, pH at 6.5 (close to neutral solution), TiO 2 concentration at 50 mg/L, gas source O 2 at 100 L/h, and hybrid corona-streamer discharge mode. Introduced TiO 2 into pulsed discharge plasma process under such optimum condition, the rate constant of 4-CP degradation (k cp ) was greatly promoted, from 1.56 · 10 )3 to 2.81 · 10 )3 s )1 , and energy efficiency for 4-CP removal was greatly enhanced by approximately one time, and it was attributed to more amounts of chemically active species (e.g., ozone and hydrogen peroxide, especially hydroxyl radicals) produced in pulsed discharge plasma process in combination with TiO 2 photocatalyst.

Degradation of phenolic compounds in water by non-thermal plasma treatment

“…Sugiarto and Sato [1] showed that addition of oxidants to the NTP enhanced the degradation of organic compounds. Also, Hao et al [9] have reported on combining TiO 2 and NTP in a process for the degradation of the organic pollutant 4-chlorophenol in water. These studies mainly focused on the use of NTP process with metal oxide or oxidant additives, different discharge types, and various gas sources for the removal of organic compounds from wastewater [1 ,5 ,9 -11].…”

Acceleration of Acetone Destruction Process under Synergistic Action of Photocatalytic Oxidation and Barrier Discharge

“…In some cases they try to introduce catalyst into the discharge area [6] and have negative results. In some other cases [7] they succeed. Authors of paper [8] present a novel dielectric barrier discharge (DBD) reactor with the inner catalytic electrode made of sintered metal fibers.…”

“…(1) porous support with photocatalyst, (2) quartz capillary, (3) high voltage electrode, (4) grounded electrode, (5) connection to high voltage, (6) fan,(7) …”

Inactivation of Bacteria in Oil Field Injection Water by Non-thermal Plasma Treatment

“…The potential reason may be that when O 2 aeration intensity is over 1,000 m 3 (m 3 h) -1 , the discharge mode changes from streamer discharge to spark discharge. Under this condition, O 2 bubble is bigger at diameter than that for lower O 2 aeration intensity, resulting in lengthening the transferred distance of the active radicals between electrode top and liquid [30]. Hence, these active species are hard to reach the water and react with bacteria.…”