Investigation of excimer ultraviolet sources from dielectric barrier discharge in krypton and halogen mixtures

Feng, Xiaoyuan; Zhu, Shaolong

doi:10.1088/0031-8949/74/3/005

Cited by 21 publications

(10 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are some difficulties in directly obtaining the emission spectra of KrI * excimer in OCPP, so we designed a KrI * excimer lamp driven by high voltage ac power supply instead of the OCPP reactor. The details are nearly the same as that in the previous study [29]. Solid iodine was heated to be vaporized at a pressure of about 20 kPa, delivered into the lamp which was then filled with krypton.…”

Section: Emission Spectra Of Krimentioning

confidence: 99%

Destruction of benzene in an air stream by the outer combined plasma photolysis method

Ye¹,

Shen²,

Xi³

et al. 2007

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

An outer combined plasma photolysis (OCPP) reactor that simultaneously utilized a dielectric barrier discharge (DBD) plasma and UV radiation from DBD-driven KrI* excimer was designed and constructed. Gas streams containing benzene were treated with normal DBD and OCPP at atmospheric pressure. In contrast to DBD, benzene removal efficiency increased by 15.9% in OCPP when applied voltage, gas flow rate and initial concentration of benzene were set at 9 kV, 35 L min−1 and 800 mg m−3, respectively. Thus, the applied voltage could be reduced to a certain extent in the plasma decomposition of pollutants with OCPP. In addition, the effects of various operational parameters including pressure of filled Kr, ratio of Kr/I2 and quartz dielectric characteristics on OCPP performance were investigated. Finally, the likely reaction mechanisms for the removal of benzene by OCPP were suggested on the basis of the emission spectra of KrI* excimer and byproducts analysis. Those results would offer prospective commercial applications for pollutant decomposition with OCPP.

show abstract

Section: Emission Spectra Of Krimentioning

confidence: 99%

Destruction of benzene in an air stream by the outer combined plasma photolysis method

Ye¹,

Shen²,

Xi³

et al. 2007

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…Excimer formation uses dielectric barrier discharge (DBD) to generate incoherent UV radiation as the light source for photophysical and photochemical reactions [12]. Despite the several studies regarding rare-gas dimeric excimers (e.g., Ar 2 *, Kr 2 * and Xe 2 *) [13][14][15] and rare-gas halide (RH*) excimers (e.g., KrCl*, XeCl*, XeBr*, XeI*), [16][17][18][19] only scant studies have highlighted their applicability in (microwave/UV)-induced photolytic decomposition of pollutants in contaminated wastewaters. In this regard, Bi and co-workers [20] demonstrated the decomposition of aqueous solutions of quinoline and indole using a microwave discharged KrBr*-excilamp.…”

Section: Introductionmentioning

confidence: 99%

Development of a Hg-free UV light source incorporating a Kr/Br2 gas, and its application for wastewater treatments

Chitete-Mawenda

Serpone

Horikoshi

2021

Photochem Photobiol Sci

View full text Add to dashboard Cite

Mercury lamps are typically the major light sources in water treatments. However, the use of mercury has raised some concerns with regard to the Minamata Convention on Mercury. As such, Hg-free microwave discharged electrodeless lamps (MDELs) that incorporate a rare gas and a halogen gas (R/H-MDEL) have been investigated with such Hg-free mixture filler gases as Kr/Cl 2 , Xe/Cl 2 , and Kr/Br 2 (R/H). Of these, only the Kr/Br 2 -MDEL lamp is self-ignited at an inner pressure of 15 Torr when irradiated with microwave radiation. Accordingly, a novel Kr/Br 2 three-layer MDEL (Kr/Br 2 -MDEL) photoreactor was fabricated to assess the optimal gas composition and gas pressure toward its performance vis-à-vis the treatment of model wastewaters contaminated with the tartrazine dye in aqueous media and with Escherichia coli (E. coli) bacteria. The extent of degradation of the tartrazine dye and sterilization of E. coli increased with irradiation time, with microwave radiation power (100, 200, and 300 W), and with increased sample flow rate 0.4 L min -1 to 0.8 L min -1 . The tartrazine-contaminated wastewater was treated at a flow rate of 0.4 L min -1 for 60 min of microwave irradiation by three different protocols that resulted in UV (62%) >> UV/ROS (24%) > ROS (0%); ROS denotes reactive oxygen species. After 5 min irradiation of the E.coli wastewater, also at 0.4 L min -1 , the order was UV (99.5%) ≈ UV/ROS (99.3%) >> ROS (14.5%). For comparison, the photosterilization of E. coli with an equivalent Hg/Ar-MDEL light source was also nearly complete (99.7%). Thus, the suitability of the environmentally friendlier Kr/Br 2 gas fill to replace Hg/Ar filler gas in MDELs for the photoelimination of organic pollutants and microbial disinfection in aqueous media has been demonstrated.

show abstract

“…One of the applications of volume discharges in inert gases is gas laser pumping. In this case, in order to increase the power characteristics of gas lasers, we need (i) to improve the pumping methods and (ii) to optimize the excitation conditions [1,2,3,4,5,6,7]. A problem of pumping optimization consists in the reception of certain electric characteristics of discharge plasma with a constant spatial uniformity during the pumping.…”

Section: Introductionmentioning

confidence: 99%

About the Uniformity and the Stability of a Volume Discharge in Helium in Near-Atmospheric Pressure

et al. 2015

View full text Add to dashboard Cite

show abstract

Investigation of excimer ultraviolet sources from dielectric barrier discharge in krypton and halogen mixtures

Cited by 21 publications

References 21 publications

Destruction of benzene in an air stream by the outer combined plasma photolysis method

Destruction of benzene in an air stream by the outer combined plasma photolysis method

Development of a Hg-free UV light source incorporating a Kr/Br2 gas, and its application for wastewater treatments

About the Uniformity and the Stability of a Volume Discharge in Helium in Near-Atmospheric Pressure

Contact Info

Product

Resources

About