Barbosa Ada Azevedo, de Aquino Ramon Vinicius Santos, da Cruz Santana Neves Naiana Santos, Dantas Renato Falcão, Duarte Marta Maria Menezes Bezerra, Rossiter Sá da Rocha Otidene
Department of Chemical Engineering, Universidade Federal de Pernambuco (UFPE), Prof. Arthur de Sá av., Cidade Universitária, Recife, Brazil E-mail:
School of Technology, State University of Campinas (UNICAMP), Paschoal Marmo 1888, 13484-332, Limeira, Brazil.
Water Sci Technol. 2019 Mar;79(6):1134-1143. doi: 10.2166/wst.2019.111.
This work investigated the efficiency of polyethylene terephthalate (PET) as support material for TiO films in the photocatalytic degradation of red Bordeaux and yellow tartrazine dyes. The optimum operating conditions were determined by a factorial design, which resulted after 180 min of treatment in degradations of 99.5% and 99.1% for the UVC/HO/TiO and solar/HO/TiO systems, respectively. For the kinetic study, the experimental data fitted to the pseudo-first-order model and the calculated kinetic constants (k) values were 0.03 min for the UVC/HO/TiO system and 0.0213 min for the system solar/HO/TiO. It was verified that TiO supported in the PET remained with high degradation efficiency even after five cycles of reuse, indicating a good stability of the photocatalyst in the support. A significant reduction of TOC content was also observed along the reaction time. The phytotoxicity bioassay with Lactuca sativa demonstrated that after treatment with UVC/HO/TiO and solar/HO/TiO, an increase in IC50 and consequently lower toxicity was observed.
本研究考察了聚对苯二甲酸乙二酯（PET）作为二氧化钛（TiO₂）薄膜载体材料在光催化降解红酒红染料和柠檬黄染料方面的效率。通过析因设计确定了最佳操作条件，在180分钟的处理后，UVC/HO/TiO₂和太阳能/HO/TiO₂系统对染料的降解率分别为99.5%和99.1%。对于动力学研究，实验数据符合准一级模型，计算得到的动力学常数（k）值，UVC/HO/TiO₂系统为0.03 min⁻¹，太阳能/HO/TiO₂系统为0.0213 min⁻¹。结果表明，负载在PET上的TiO₂即使在重复使用五个循环后仍保持较高的降解效率，这表明光催化剂在载体上具有良好的稳定性。同时，随着反应时间的延长，总有机碳（TOC）含量也显著降低。用生菜进行的植物毒性生物测定表明，经UVC/HO/TiO₂和太阳能/HO/TiO₂处理后，半数抑制浓度（IC₅₀）增加且毒性降低。
