Department of Chemical and Materials Engineering, National Yunlin University of Science & Technology, 123 University Road, Section 3, Douliou, Yunlin 640, Taiwan.
Ultrason Sonochem. 2012 Jul;19(4):921-7. doi: 10.1016/j.ultsonch.2011.12.012. Epub 2011 Dec 23.
Oxidative degradation of dinitrotoluenes (DNTs) in wastewater was performed using persulfate anions combined with ultrasonic irradiation, wherein a synergistic effect is observed. The batch-wise experiments were carried out to elucidate the influence of various operating parameters on sono-activated persulfate oxidation, including ultrasonic power intensity, persulfate anion concentration, reaction temperature and acidity of wastewater. It is noteworthy that the nitrotoluene contaminants could be almost completely eliminated by virtue of sono-activated persulfate oxidation, wherein sulfate radicals serve as principal oxidants, of which amounts are significantly enhanced via addition of sodium sulfate. Based on the results given by gas chromatograph-mass spectrometer (GC-MS), it is postulated that the methyl group of DNTs preliminarily underwent oxidation pathway into dinitrobenzoic acid, followed by decarboxylation to form 1,3-dinitrobenzene (DNB). In sum, the sono-activated persulfate oxidation is a promising method for treatment of nitrotoluenes in wastewater.
过硫酸盐联合超声辐射促进废水脱氮实验研究，协同作用明显。通过批次实验，研究了各种操作参数对超声激活过硫酸盐氧化的影响，包括超声功率强度、过硫酸盐阴离子浓度、反应温度和废水酸度。值得注意的是，过硫酸盐氧化可以几乎完全去除硝基甲苯污染物，其中硫酸根自由基作为主要氧化剂，通过添加硫酸钠可以显著增加其数量。根据气相色谱-质谱联用仪（GC-MS）的结果，推测 DNTs 的甲基基团首先经历氧化途径生成二硝基苯甲酸，然后脱羧形成 1,3-二硝基苯（DNB）。总之，超声激活过硫酸盐氧化是处理废水中硝基甲苯的一种很有前途的方法。
