茜素绿的微波无极紫外光降解及产物分析

Photo-degradation and production analysis of alizarin green with microwave powered electrodeless discharged UV lamp

以茜素绿为研究对象,探讨了蒽醌类染料在微波无极紫外灯光辐射下的降解行为。结果表明,茜素绿的脱色反应符合一级反应动力学规律,反应120 min后COD和TOC的去除率分别为65.79%和60.98%;采用荧光色谱仪和电子顺磁共振仪检测到降解过程中羟基自由基和超氧自由基为主要活性物种;利用红外光谱仪、离子色谱仪和电子喷雾质谱仪分析了反应过程中的中间产物;采用电喷雾等技术和离子色谱测定了茜素绿降解的中间产物,并推断了茜素绿微波紫外光降解可能的历程;采用大肠杆菌和锦鲤对溶液进行了生物毒性检测与评价,由于中间产物的产生降解溶液的毒性先升后降。

Alizarn green was selected as the target pollution and the degradation behavior of anthraquinone dye was investigated under irradiation by microwave electrodeless discharged UV lamp. The results showed that discoloration reaction of alizarin green followed the first-order kinetics. COD removal efficiency and TOC removal efficiency exceeded 65. 79% and 60. 98% in 120 min,respectively. Hydroxyl radical and superoxide radical were determined by fluorescence spectrometer and electron paramagnetic resonance as the main reactive oxygen species during the degradation. The intermediate products were analyzed using infrared spectrometer,ion chromatography and electrospray ionization mass spectrometry,and a possible pathway was proposed. The acute toxicity of solution was also assessed by using E. coli and brocarded carp,which first increased and then decreased,due to the formation and then degradation of toxic intermediates.