本文以深度处理后印染废水为配水模拟实际废水,对颗粒活性炭催化臭氧氧化降解活性黑5进行了研究.用低温N2吸附-脱附等温线、SEM-EDS等对颗粒活性炭进行了表征,发现颗粒活性炭比表面积高达931 m2·g-1.考察了颗粒活性炭吸附性能和催化臭氧活性,结果表明单独臭氧与颗粒活性炭催化臭氧脱色率在反应30 min内均高达100％.反应1h时,5 g·L-1、10 g·L-1颗粒活性炭催化臭氧TOC去除率分别为57％、74％,比单独臭氧高出33％和50％,颗粒活性炭具有良好的催化效果,能提高对污染物的矿化效果.颗粒活性炭促进了溶解性臭氧分解,重复使用6次后10 g·L-1活性炭在反应时间为2h时染料废水TOC去除率均能稳定在85％左右,多次利用后活性炭的催化活性没有明显降低.EPR检测表明,其主要机制为颗粒活性炭能够稳定地催化臭氧分子分解产生羟基自由基,实现污水中有机物的矿化.
Catalytic ozonation of aqueous Reactive Black (RB5) in the presence of granular activated carbon (GAC) was investigated,employing the effluent from advanced treatment of dyeing wastewater as the simulated wastewater.The GAC was characterized by low temperature N2 adsorption-desorption isotherm and SEM-EDS.It was showed that the specific surface area of GAC reached 931 m2· g-1.In the experiments of GAC's adsorption performance and the catalytic activity of ozone,the results showed that the decolorization rate of GAC and ozone alone reached as high as 100％ within 30 mins.While after one hour reaction,the TOC removal rate was 57％ and 74％ respectively in the presence of 5 g· L-1 and 10 g· L-1 GAC,which represented 33％ and 50％ increase compared to ozone alone.The GAC had good catalytic stability and enhanced the decomposition of the soluble ozone.10 g· L-1 GAC showed a stable ability to treat the dyeing wastewater with the TOC removal rate as high as 85％,within 2 hours after 6 times reuse.EPR results manifested that the GAC steadily promoted the decomposition of ozone to generate hydroxyl radicals,which contributed significantly to the mineralization of the organic contaminants.
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