摘要
以酸性金黄G模拟染料废水为研究对象,观察臭氧氧化过程中染料溶液吸光度和TOC的变化,利用离子色谱仪、红外光谱仪和GC/MS对染料的降解过程进行了分析,并用发光细菌法检测了溶液急性毒性的变化.结果表明,臭氧对染料的降解符合一级反应动力学,反应40min后染料溶液的脱色率达到99.3%,TOC去除率为35.7%;染料分子中的S有97.8%被转化为SO42-,分子中的仲胺基部分转化成酰胺基,水解后生成NH4+,最终氧化成NO3-,溶液中有草酸产生;溶液在臭氧化前期由于生成了醛类和酚类物质,使急性毒性首先呈上升趋势,25min后随着氧化的深入,溶液毒性开始逐渐下降.
The degradation of acid yellow 36 was investigated by using ozone. The changes of absorbance and TOC of dye solution were detected during the process. The ozonation mechanism of dye was analyzed by using ion chromatography, infrared spectrometer and GC/MS. Finally, the acute toxicity of dye solution was measured by using the method of luminescent bacteria. The results showed that the decolorization of dye followed the first-order kinetics. Decolorization efficiency exceeded 99.3% in 40 min during ozonation. And 97.8% of S atoms in dye molecular were transformed into SO4^2-. A part of sec-amine groups were transformed into acylamide which was hydrolyzed to NHg, and NO3^- was produced by oxidation. After reaction, oxalate acid was produced in dye solution. During ozonation, the acute toxicity of dye solution increased firstly because of aldehydes and phenols compounds, and then decreased gradually after 25min.
出处
《环境化学》
CAS
CSCD
北大核心
2009年第3期383-386,共4页
Environmental Chemistry
基金
国家自然科学基金项目(20277010)
关键词
酸性染料
臭氧氧化
脱色
毒性
acid dye, ozonation, decolorization, toxicity
