A UV lamp based on a Kr-Xe mixture with Br2 and I2 molecules

Шуаибов, А. К.; Grabovaya, I. A.; Shimon, L. L.

doi:10.1134/s0020441206010143

Cited by 1 publication

(2 citation statements)

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“…The Kr/Br 2 mixture contains the heavier and less-reactive Br 2 gas (versus Cl 2 ) which thus offers a longer operating life. Moreover, the emission line at 207 nm for the [KrBr*] is especially optimal for photobiological applications in that the absorption spectrum of DNA molecules exhibits two absorption maxima in the vicinity of 200 and 260 nm [25]. The coefficient of linear absorption in the region of the 207-nm line of [KrBr*] is about twofold greater than in the long-wavelength maximum [26].…”

Section: Optimal Encapsulated Gas In R/h-mdelmentioning

confidence: 99%

“…The coefficient of linear absorption in the region of the 207-nm line of [KrBr*] is about twofold greater than in the long-wavelength maximum [26]. Subsequently, we used the Kr/Br 2 mixture in the fabrication of Hg-free MDEL prototypes for further evaluation of wastewater treatment using the UV light generated from the Kr/ Table 1 Self-ignition test results for the excimer/halogen-MDELs (R/H-MDELs) using an applied alternating current at a frequency of 9-12 kHz (dielectric barrier discharge: DBD) versus irradiation with 2.45-GHz microwaves (microwave discharge: MWD) at an input power of 500 W Br 2 gases within the MDEL that involved several reaction steps as described by Han and co-workers [25].…”

Section: Optimal Encapsulated Gas In R/h-mdelmentioning

confidence: 99%

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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

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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.

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Section: Optimal Encapsulated Gas In R/h-mdelmentioning

confidence: 99%

Section: Optimal Encapsulated Gas In R/h-mdelmentioning

confidence: 99%