活性碳纤维负载镧掺杂二氧化钛处理印染废水

Treatment of Printing and Dyeing Wastewater by La-TiO2 Modified Active Carbon Fiber

制备活性炭纤维负载镧掺杂二氧化钛光催化剂(La-TiO2/ACF),其的结构与组成进行了表征;考察了催化剂对实际印染废水脱色、COD去除以及可生化性提高方面的性能。结果表明,La-TiO2/ACF表面均匀有效的负载了锐钛矿型纳米La-TiO2薄膜。紫外光与催化剂同时作用的脱色效果明显优于单独紫外线照射和单独催化剂吸附。处理50 min,脱色率可达90%,COD去除率达69.2%,BOD5/COD从最初的0.037提高到0.35。色度和COD去除率随光源与催化剂间距离的增加先升高后降低,在间距为20 mm时达到最佳;pH从3升高到9,色度和COD去除率分别提高22%和32%。催化剂重复使用10次,催化活性未发生明显下降。

La-TiO2 was dispersed on active carbon fiber (ACF) surface to prepare the photo catalysts (La-TiO2/ACF), the structure and composition of catalyst was characterized. The decolorization performance, COD remove ability and biodegradability improvements of the catalyst were investigated. The results have showed that, anatase type La-TiO2 nano film was loaded on the surface of La-TiO2/ACF uniformly and effectively. The decolorization effect of UV and catalyst synergy was better than that of UV irradiation or catalyst alone. The removal rate of chromaticity and COD were up to 90% and 69.2% respectively, and BOD5/COD increased from the 0.037 to 0.35 with processing in 50 min. The chromaticity and COD removal rate first increased and then decreased with the increase of distance between the light source and catalyst, and the best value was 20 mm. The removal rate of chromaticity and COD increased by 22% and 32% respectively, when pH increased from 3 to 9. The catalytic activity did not decrease significantly after reused for 10 times.