Department of Chemistry, Postgraduate Programme in Technology of Chemical and Biochemical Processes, Federal Technological University of Paraná, Pato Branco, PR, Brazil.
Academic Department of Chemistry and Biology, Post graduation in Environmental Science and Technology Federal Technological University of Paraná, Curitiba, PR, Brazil.
J Hazard Mater. 2015 Aug 15;293:81-6. doi: 10.1016/j.jhazmat.2015.03.017. Epub 2015 Mar 11.
The current study aims to characterize and evaluate the photocatalytic treatability of the "red water" effluent from a Brazilian TNT production industry. Analyses were performed using physical, chemical, spectroscopic and chromatographic assays, which demonstrated that the effluent presented a significant pollution potential, mainly due to COD, BOD, solids and to the high concentration of nitroaromatic compounds such as 1,3,5-trinitrobenzene, 1-methyl-2,4-dinitrobenzene, 2-methyl-1,3-dinitrobenzene, 2,4,6-trinitrotoluene-3,5-dinitro-p-toluidine and 2-methyl-3,5-dinitro-benzoamine. By a modified sol-gel and a dip-coating technique, it was possible to obtain a TiO2 film on borosilicate glass substrate which functional composition and microstructure were characterized by infrared spectroscopy and scanning electron microscopy. The evaluation of the photocatalytic treatability using borosilicate-glass-TiO2 demonstrated high degradation efficiency. In this context, a reduction of 32 and 100% for COD and nitroaromatic compounds, respectively, was observed. Although the proposed photocatalytic process has found difficulties in reducing the content of organic matter and effluent color in the red water, its potential for degrading refractory chemical compounds such as the nitroaromatic ones enables it to be used as tertiary treatment.
本研究旨在对巴西 TNT 生产工业“红水”废水的光催化处理性能进行特征描述和评估。通过物理、化学、光谱和色谱分析进行了分析，结果表明，废水具有很大的污染潜力，主要是由于 COD、BOD、固体以及高浓度的硝基芳香族化合物，如 1,3,5-三硝基苯、1-甲基-2,4-二硝基苯、2-甲基-1,3-二硝基苯、2,4,6-三硝基甲苯-3,5-二硝基-对甲苯胺和 2-甲基-3,5-二硝基苯甲胺。通过改进的溶胶-凝胶法和浸涂技术，在硼硅酸盐玻璃基底上获得了 TiO2 薄膜，其官能团组成和微观结构通过红外光谱和扫描电子显微镜进行了表征。通过硼硅酸盐玻璃-TiO2 评估光催化处理性能，发现其具有很高的降解效率。在此背景下，COD 和硝基芳香族化合物的去除率分别达到 32%和 100%。尽管所提出的光催化工艺在降低红水有机物质含量和废水颜色方面遇到了困难，但它对难降解化学化合物（如硝基芳香族化合物）的降解潜力使其能够作为三级处理。
