Study on effect of surface electrical properties on removal efficiency of ammonia nitrogen from aquaculture wastewater by TiO2 nanotube-SiC composite filler
The experiment was conducted to investigate the performance of titanium dioxide(TiO2)nanotube-silicon carbide(SiC)composite filler in purifying aquaculture wastewater.In this experiment,three kinds of TiO2 nanotubes with different particle sizes and crystal phases were synthesized by alkaline hydrothermal synthesis method with different precursors,the surface electrical properties,X-ray diffraction patterns and field emission scanning electron microscopy of the three TiO2 nanotubes were tested.The removal of ammonia nitrogen pollutants from aquaculture wastewater under ultraviolet irradiation and dark conditions was studied after it was loaded on SiC sheet and covered with microbial film.The results showed that the surface of TiO2 nanotubes synthesized by anatase precursor with crystal phase was negatively charged,while the surface of TiO2 nanotubes synthesized by rutile and anatase mixed precursor with crystal phase was positively charged,and TiO2 nanotubes with positive surface charge could promote the membrane adhesion of microorganisms with bionegative charge,thus promoting the removal of ammonia nitrogen in aquaculture wastewater.The removal rates of ammonia nitrogen in SiC sheet supported by P25 TiO2 nanotubes were 86.1％and 58.9％respectively under ultraviolet light and dark conditions.The results show that compared with dark conditions,UV irradiation can affect the photocatalytic activity of TiO2 and improve the efficiency of TiO2 nanotube-sic composite filler in removing ammonia nitrogen from aquaculture wastewater.
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