Souza Renata P, Ambrosio Elizangela, Souza Maisa T F, Freitas Thábata K F S, Ferrari-Lima Ana M, Garcia Juliana C
Department of Chemistry, Universidade Estadual de Maringá, Avenida Colombo 5790, Maringá, PR, 87020-900, Brazil.
Department of Bioprocess Engineering and Biotechnology, Universidade Tecnológica Federal do Paraná, Estrada para Boa Esperança Km 04, Dois Vizinhos, PR, 85660-000, Brazil.
Environ Sci Pollut Res Int. 2017 May;24(14):12691-12699. doi: 10.1007/s11356-017-8408-8. Epub 2017 Jan 16.
The photocatalytic degradation of textile effluent was investigated using TiO, ZnO, and NbO catalysts under solar irradiation. The procedures were carried out at ambient conditions in April 2014, with pH 3.0 and catalyst concentration of 0.250 g L. The photocatalytic activity of the oxides was evaluated by means of kinetic efficiency (rate constant and half-life time), chemical oxygen demand reduction, and absorbance reduction at 228, 254, 284, 310, 350, 500, and 660 nm (λ). Mineralization in terms of the formation of inorganic ions and toxicity reduction using bioassays with Artemia salina were performed. TiO reduced the absorbance at 660 nm (λ) after 300 min of solar irradiation around 94 and 93%; and 68 and 60% of COD, respectively. ZnO showed lower photocatalytic activity giving 64 and 42% of absorbance and COD reduction, respectively. The photocatalytic activity of NbO was very close to TiO-P25. In this sense, NbO becomes a promising alternative to replace the commercial TiO-P25. Bioassays confirmed the efficacy of treatment, increasing the lethal concentration of 27.59 (in natura) to 131.95% in the presence of NbO.
在太阳光照射下，使用TiO、ZnO和NbO催化剂研究了纺织废水的光催化降解。实验于2014年4月在环境条件下进行，pH值为3.0，催化剂浓度为0.250 g/L。通过动力学效率（速率常数和半衰期）、化学需氧量降低以及在228、254、284、310、350、500和660 nm（λ）处的吸光度降低来评估氧化物的光催化活性。进行了无机离子形成方面的矿化以及使用卤虫生物测定法降低毒性的实验。在太阳光照射300分钟后，TiO使660 nm（λ）处的吸光度分别降低了约94%和93%；化学需氧量分别降低了68%和60%。ZnO的光催化活性较低，吸光度和化学需氧量的降低率分别为64%和42%。NbO的光催化活性与TiO-P25非常接近。从这个意义上说，NbO成为替代商业TiO-P25的有前景的选择。生物测定法证实了处理的有效性，在存在NbO的情况下，将致死浓度从27.59（天然状态）提高到了131.95%。
