Guz Ricardo, de Moura Cristiane, da Cunha Mário Antônio Alves, Rodrigues Marcio Barreto
Instituto Federal de Santa Catarina-IFSC, Campus Caçador. Av. Fahdo Thomé, 3000, Champagnat, CEP 89500-000, Caçador, Santa Catarina, Brazil.
Universidade Tecnológica Federal do Paraná-UTFPR, Câmpus Pato Branco. Via do Conhecimento, Km 1, CEP 85503-390, Pato Branco, Paraná, Brazil.
Environ Sci Pollut Res Int. 2017 Mar;24(7):6055-6060. doi: 10.1007/s11356-016-6460-4. Epub 2016 Mar 23.
In trinitrotoluene (TNT) purification process, realized in industries, there are two washes carried out at the end of the procedure. The first is performed with vaporized water, from which the first effluent, called yellow water, is originated. Then, a second wash is performed using sodium sulfite, generating the red water effluent. The objective of this work was to get the best conditions for photocatalytic degradation of the second effluent, red water, in order to reduce toxicity and adjust legal parameters according to regulatory agencies for dumping these effluents into waterways. It has used a statistical evaluation for factor interaction (pH, concentration) that affects heterogeneous photocatalysis with titanium dioxide (TiO). Thus, the treatment applied in the factorial experimental design consisted of using a volume equal to 500 mL of the effluent to 0.1 % by batch treatment, which has changed TiO pH and concentration, according to the design, with 20 min time for evaluation, where it was used as response to the reduction of UV-Vis absorption. According to the design responses, it has obtained optimum values for the parameters evaluated: pH = 6.5 and concentration of 100 mg/L of TiO were shown to be efficient when applied to red water effluent, obtaining approximately 91 % of discoloration.
在工业实现的三硝基甲苯（TNT）提纯过程中，该流程结束时会进行两次洗涤。第一次是用汽化水进行洗涤，由此产生第一种流出物，称为黄水。然后，第二次洗涤使用亚硫酸钠进行，产生红色水流出物。这项工作的目的是获得对第二种流出物——红色水进行光催化降解的最佳条件，以降低毒性并根据监管机构的规定调整将这些流出物排放到水道中的法定参数。研究采用了统计评估来研究影响二氧化钛（TiO₂）非均相光催化的因素相互作用（pH值、浓度）。因此，析因实验设计中采用的处理方法是，按批次处理使用500毫升流出物，使其达到0.1%，根据设计改变TiO₂的pH值和浓度，评估时间为20分钟，以紫外-可见吸收的降低作为响应。根据设计响应，得出了所评估参数的最佳值：当应用于红色水流出物时，pH值为6.5且TiO₂浓度为100毫克/升显示出高效性，实现了约91%的脱色率。
