Papers by Keyword: Halogen

Abstract: For coal-fired power plant boiler flue gas desulfurization wastewater’s actual spraying proposed combination bag house dust while mercury removal process. Experimental study of the coal-fired boiler flue gas spraying chlorine ions and other halogens desulfurization wastewater modified fly ash flue gas mercury performance. Studies showed that desulfurization wastewater fly ash on chloride ion enhanced oxidation of elemental mercury, with the increase in the amount sprayed desulfurization wastewater, flue gas mercury capacity increased. Desulfurization wastewater add another halogen element can promote flue gas mercury performance, the effect of iodine was the most significant, followed by bromine. The desulfurization wastewater as a modified liquid sprayed into the flue modified fly ash, fly ash can improve mercury removal performance, eliminate the need for desulfurization wastewater treatment, cost savings, achieve desulfurization wastewater recycling.

Abstract: An etch pit shape of off-angled 4H-SiC Si-face formed by different halogen gases such as chlorine trifluoride (ClF3) and a mixed gas (O2+Cl2) of oxygen and chlorine in nitrogen (N2) ambience has been studied. One kind of etch pit with the crooked hexagon was formed at etching temperature under 500oC. The angle of etch pit measured by the cross-sectional atomic force microscope image was about 10o from the [11-20] view. A dislocation type of the etch pit was discussed in comparison with the etch pit shape and an X-ray topography image.

Abstract: La³⁺/halogen (F^-, Cl^- and Br^-) co-doped TiO₂ was synthesized by alkoxide hydrolysis method. The prepared La³⁺/halogen TiO₂ photocatalysts with anatase phases and rutile phases were characterized with XRD, EDS, TEM and surface area analytic technology. Methyl orange was used as model pollutants to evaluate its visible light photocatalytic activity. The results showed that the co-doping of La³⁺ and halogen ions improved the surface area of TiO₂. Compared with 450°C and 650°C, La³⁺/Cl^- and La³⁺/Br^- co-doped TiO₂ calcined at 550°C exhibited much higher photocatalytic activity. The optimal doping ratio of La³⁺/F^-, La³⁺/Cl^- and La³⁺/Br^- was 0.4, 0.6, and 0.5 ((wt%)/(wt%)), respectively. Moreover, the degradation ratio of methyl orange on La³⁺/halogen co-doped TiO₂ with the optimal ratio were all higher than the maximum degradation ratio on La³⁺, F^-, Cl^- and Br^- doped TiO₂ prepared by the same method.