Abstract. This study focused on electrolysis of refractory malachite green waste water with three-dimensional electrode. In this research, high-purity graphite was used as the cathode, titanium-plating metal mesh as the anode, while coal column, coconut shell granular activated carbon and catalytic Titanium dioxide (TiO 2 ) modified activated carbon as particle electrode, respectively. The electrolytic condition was set as follows: pH=6, the voltage of 8 v, an aeration rate of 20 L/h, an electrolyte concentration of 0.1 mol/L, an electrolysis time of 2 h, and the highest chemical oxygen demand (COD) degradation rate of malachite green was up to 99%. That TiO 2 modified activated carbon served as particle electrode can increase the degradation effect and the current efficiency. Ultraviolet (UV) analysis showed that the structure of malachite green was altered to achieve an effective degradation during the electrolysis process with three-dimensional electrode.
The polymer/inorganic nanometer composite dielectric film with good mechanical, electrics and thermal properties, has become a highlight in the field of materials research. MMT and TiO 2 are doped into the polyimide to study the influence of the mass ratio of MMT and TiO 2 on the structure of polyimide matrix nanocomposite materials. In this paper different components of MMT are doped into the PI/(TiO 2 +MMT) nanocomposite film through the in situ polymerization. The film thickness is 30 micrometer.To take the quality of TiO 2 for reference, the mass ratio between TiO 2 and MMT were changed which doped into the nanocomposite film, dividing into two different series named series A (the mass fraction of TiO 2 is 1%) and series B (the mass fraction of TiO 2 is 3%). The structures of two series films are tested by infrared spectrum (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD) to study the influence of the mass fraction of MMT on the structure of the PI/(TiO 2 +MMT) nanocomposite film. The results show that the addition of inorganic nanoparticles doesn't affect the accomplishment of polyimide matrix imidization which reflects completely. The distribution of TiO 2 and MMT particles in the polyimide matrix are uniform, most of MMT sheets paralleled to the film surface and this kind structure can prevent electric field damage materials and increase corona life of nanocomposite films obviously. The appropriate proportions of TiO 2 and MMT inorganic particles in composite films can raise the film performance. The comprehensive performances of B1 sample are best
The corona resistant property of polyimide (PI) composite films is a very important parameter in the application of electrical insulation materials. The reports show that the ultraviolet (UV) ray in the corona process always destroy the PI. In this background, a novel method using SiOz-coated TiOz (TiOz@SiOz) particle as dopant in PI has been proposed and the composite films with different content of PI/Si02@TiOz are prepared. Surface morphology, corona resistant property and UV -vis absorption property of the composite films are tested and characterized by scanning electron microscope (SEM), corona resistant system (CRS) and UV-vis spectroscopy (UV-VIS) respectively. The results show that PlITi02@Si02 and PlITiOz films are successfully prepared with different doping content and inorganic nano-particles are well dispersed into the PI. After the corona, the surface of the both kinds of films become rougher and the surface flatness of PI/Ti02@Si02 is better than that of PI/Ti02. The mass fraction of the C element on the surface of the films decreases. On the contrary, the mass fractions of the 0 element and Ti element increase in the process of corona. The lost mass fraction of the C element in the PlITiOz@Si02 is less than that in the PlITiOz• This shows that the stability of PIITi02@Si02 is better than that of PlITi02• With the increase of the content of the nano-particles in the films, the corona resistant properties of the composite films increase gradually. When the content of the nano-particles is about 25%, the corona resistant time is the longest. Beyond that doping content, the time will be shorter. The corona resistant property of the composite films doped with TiOz@SiOz are better than those doped with TiOz under the condition of doping the same content. The UV -visible absorption ability of the PI/Ti02 is more significant than that of PlITi02@Si02• The stability of PIITiOz@Si02 is better than that of PIITiOz, so the corona resistant property of PlITi02@Si02 is more excellent than that of PIITi02•
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