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采用溶胶-凝胶法制备氮掺杂纳米TiO_2负载活性炭纤维光催化复合材料(N-TiO_2/ACF)。用X射线衍射、扫描电子显微镜和紫外漫反射光谱表征N-TiO_2/ACF的晶相组织和纤维结构;以真丝绸染色废水降解效果评价其光催化活性。结果表明:当煅烧温度为773K时,所制复合材料中N-TiO_2晶粒呈锐钛矿相,粒径约为15.3nm,且均匀分布在ACF表面,其吸收边带红移至569nm。金卤灯照射下反应180min,2.31gN-TiO_2/ACF对200mL浓度为5mg/L的真丝绸染色废水的COD去除率达80.6%。
Nitrogen - doped nano-TiO 2 supported activated carbon fiber photocatalytic composite (N-TiO 2 / ACF) was prepared by sol-gel method. The crystal structure and fiber structure of N-TiO_2 / ACF were characterized by X-ray diffraction, scanning electron microscopy and ultraviolet diffuse reflectance spectroscopy. The photocatalytic activity of silk dyeing wastewater was evaluated by its degradation effect. The results show that when the calcination temperature is 773K, the grain size of N-TiO_2 in the composites is anatase, with a size of about 15.3nm, uniformly distributed on the surface of ACF, and the absorption edge shifts to 569nm. Under the irradiation of metal halide lamp for 180min, the COD removal efficiency of 2.31gN-TiO 2 / ACF for 200mL silk dyeing wastewater with a concentration of 5mg / L reached 80.6%.