表面电性对TiO2纳米管-SiC复合填料去除养殖废水中氨氮效率的影响研究
Study on effect of surface electrical properties on removal efficiency of ammonia nitrogen from aquaculture wastewater by TiO2 nanotube-SiC composite filler
洪泽 1欧阳晶莹 1李佳欣 1郑瀚2
作者信息
- 1. 大连海洋大学海洋科技与环境学院,辽宁大连 116023
- 2. 大连海洋大学海洋科技与环境学院,辽宁大连 116023;设施渔业教育部重点实验室,辽宁大连 116023
- 折叠
摘要
试验旨在探究二氧化钛(TiO2)纳米管-碳化硅(SiC)复合填料在净化养殖废水方面的性能.试验采用不同前驱体通过碱性水热合成方法合成3种不同粒径和晶相的TiO2纳米管,测试了 3种TiO2纳米管的表面电性、X射线衍射图谱和场发射扫描电镜.研究TiO2纳米管负载于SiC片上并覆盖微生物膜后,在紫外光照射和黑暗条件下去除养殖废水中氨氮污染物的性能.结果表明,晶相为锐钛矿的前驱体合成的TiO2纳米管表面带负电,晶相为金红石和锐钛矿混合的前驱体合成的TiO2纳米管表面带正电,而表面带正电的TiO2纳米管能促进带生物负电的微生物的挂膜,进而促进对养殖废水中氨氮的去除作用;其中,负载P25TiO2纳米管的SiC片对氨氮的去除率在紫外光照射和黑暗条件下的去除率分别为86.1％和58.9％.研究表明,与黑暗条件相比,紫外光照射会影响TiO2的光催化活性并提高TiO2纳米管-SiC复合填料去除养殖废水中氨氮的效率.
Abstract
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.
关键词
TiO2纳米管-SiC复合填料/表面电性/光催化协同/氨氮去除效率Key words
TiO2 nanotube-SiC composite filler/surface electricity/photocatalytic coordination/ammonia nitrogen removal efficiency引用本文复制引用
基金项目
国家自然青年科学基金项目(32102814)
省教育厅一般项目(LJKQZ20222358)
省自然科学基金联合基金面上项目(2023-MSLH-013)
出版年
2024
国家科技期刊平台
NSTL
万方数据