Domingues Fernando Santos, Freitas Thábata Karoliny Formicoli de Souza, de Almeida Cibele Andrade, de Souza Renata Padilha, Ambrosio Elizângela, Palácio Soraya Moreno, Garcia Juliana Carla
a Department of Chemistry , State University of Maringá , Maringá , Paraná , Brazil.
b Department of Bioprocess Engineering and Biotechnology , Federal Technological University of Paraná , Dois Vizinhos , Paraná , Brazil.
Environ Technol. 2019 Apr;40(10):1223-1232. doi: 10.1080/09593330.2017.1418913. Epub 2017 Dec 29.
The present work investigated the degradation of a dyeing factory effluent by advanced oxidative process under UV irradiation. TiO and ZnO were used as catalysts and the influence of different concentrations of HO added to the system was studied. The catalysts were characterized in terms of crystal structure (X-ray diffraction), textural properties (Brunauer-Emmett-Teller area and pore volume) and point of zero charge, which indicated the semiconductors had a positively charged surface in an acidic medium. After 8 h of irradiation at pH 3.0 and catalyst concentration of 0.0625 g L, the effect of HO was evaluated by means of kinetic efficiency (rate constants), absorbance reduction (at 284, 621 e 669 nm), total organic carbon reduction and mineralization (in terms of the formation of ions such as and ). Adding HO to the photocatalytic system significantly increased pollutants' removal, highlighting tests with 1.0 × 10 mol L, showing higher absorbance reduction and rate constants at 621 and 669 nm for TiO and best mineralization rates for ZnO. Ecotoxicity bioassays using Artemia salina L confirmed the treatment efficacy, with effluent lethal concentration (LC) increasing from 65.68% (in natura) to over 100% after photocatalysis treatment.
本研究考察了在紫外线照射下，采用高级氧化工艺对印染厂废水的降解情况。使用TiO和ZnO作为催化剂，并研究了向体系中添加不同浓度H₂O₂的影响。通过晶体结构（X射线衍射）、织构性质（布鲁诺尔-埃米特-泰勒比表面积和孔体积）以及零电荷点对催化剂进行了表征，结果表明半导体在酸性介质中表面带正电。在pH 3.0、催化剂浓度为0.0625 g L的条件下照射8小时后，通过动力学效率（速率常数）、吸光度降低（在284、621和669 nm处）、总有机碳降低和矿化作用（根据诸如 和 等离子的形成）来评估H₂O₂的效果。向光催化体系中添加H₂O₂显著提高了污染物的去除率，其中1.0×10 mol L的测试效果尤为突出，TiO在621和669 nm处的吸光度降低和速率常数更高，而ZnO的矿化率最佳。使用卤虫进行的生态毒性生物测定证实了处理效果，光催化处理后废水的致死浓度（LC）从65.68%（原样）提高到了100%以上。
