[en] The paper describes the raw materials and properties of polymer modified cement mortars for waterproof. In this paper, the following aspects were discussed, the effect of different polymer cement ratio on the ratio of compressive strength to flexural strength, the mechanism of the improvement of impermeability, durability and viscosity by the cooperation of super mineral powder and re-dispersible powders respectively. In addition the effect of graded sand and fiber on the cracking resistance and contractility of mortar were also studied. (paper)

[en] This paper investigates the degradation of chlorobenzene by dielectric barrier discharge (DBD) coupled with MnO_x/γ-Al₂O₃ catalysts. MnO_x/γ-Al₂O₃ catalysts were prepared using the impregnation method and were characterized in detail by N₂ adsorption/desorption, x-ray diffraction and x-ray photoelectron spectroscopy. Compared with the single DBD reactor, the coupled reactor has a better performance on the removal rate of chlorobenzene, the selectivity of CO_x, and the inhibition of ozone production, especially at low discharge voltages. The degradation rate of chlorobenzene and selectivity of CO_x can reach 96.3% and 53.0%, respectively, at the specific energy density of 1350 J l^–1. Moreover, the ozone concentration produced by the discharge is significantly reduced because the MnO_x/Al₂O₃ catalysts contribute to the decomposition of ozone to form oxygen atoms for the oxidation of chlorobenzene. In addition, based on analysis of the byproducts, the decomposition mechanism of chlorobenzene in the coupled reactor is also discussed. (paper)

[en] A new combined reactor with Hg/Ar electrodeless ultraviolet (EDUV) activated by DBD for 3,4-dichlorodiphenyl ether abatement is presented. The effect of specific input energy and feeding gas component on 3,4-dichlorodiphenyl ether removal efficiency has been explored. Compared with a single DBD system, this new combined process performed a significant promotion on 3,4-dichlorodiphenyl ether abatement. Experiment results verified that active oxygen clearly contributed to the synergistic activity of DBD-EDUV system. Results of emission spectra showed that UV radiation of 253.7 nm could be detected in the DBD-EDUV system. Further, the products of DBD-EDUV process were analyzed via gas chromatography-mass spectrometer (GC-MS) to reveal involved decomposition mechanism. (paper)

[en] This paper discusses the conversion of nitric oxide (NO) with a low-temperature plasma induced by a catalytic packed-bed dielectric barrier discharge (DBD) reactor. Alumina oxide (Al₂O₃), glass (SiO₂) and zirconium oxide (ZrO₂), three different spherical packed materials of the same size, were each present in the DBD reactor. The NO conversion under varying input voltage and specific energy density, and the effects of catalysts (titanium dioxide (TiO₂) and manganese oxide (MnO _x ) coated on Al₂O₃) on NO conversion were investigated. The experimental results showed that NO conversion was greatly enhanced in the presence of packed materials in the reactor, and the catalytic packed bed of MnO _x /Al₂O₃ showed better performance than that of TiO₂/Al₂O₃. The surface and crystal structures of the materials and catalysts were characterized through scanning electron microscopy analysis. The final products were clearly observed by a Fourier transform infrared spectrometer and provided a better understanding of NO conversion. (paper)

[en] This study aimed to discuss the removal of hydrogen sulfide (H₂S) with non-thermal plasma produced by a multilayer tubular dielectric barrier discharge reactor, which is useful in the field of plasma environmental applications. We explored the influence of various factors upon H₂S removal efficiency (${\mathrm{\eta <!--\; ??\; -->}}_{{\mathrm{H}}_2\mathrm{S}}$) and energy yield (Ey), such as specific energy density (SED), initial concentration, gas flow velocity and the reactor configuration. The study showed that we can achieve ${\mathrm{\eta <!--\; ??\; -->}}_{{\mathrm{H}}_2\mathrm{S}}$ of 91% and the best Ey of 3100 mg kWh⁻¹ when we set the SED, gas flow velocity, initial H₂S concentration and layers of quartz tubes at 33.2 J l⁻¹, 8.0 m s⁻¹, 30 mg m⁻³ and five layers, correspondingly. The average rate constant for the decomposition of hydrogen sulfide was 0.206 g m⁻³ s⁻¹. In addition, we also presented the optimized working conditions, by-product analysis and decomposition mechanism. (paper)