摘要
通过微波辐射前后水样的紫外分光扫描分析,以及微波辐射后水样中的苯酚浓度和COD浓度之间线性相关性分析表明,活性炭-微波辐射强化除酚效率的主要机理是微波使反应体系温度升高导致的活性炭加速吸附作用,而不是微波诱导催化氧化作用。通过对微波辐射前后活性炭的SEM扫描电镜分析说明,活性炭在微波场中由于"微域爆炸"导致其表面及内部孔隙结构的变化,吸附性能得到改善,是强化苯酚去除的另一原因。研究还表明,在较短的作用时间内,活性炭-微波辐射法的除酚效率高于常温吸附,但低于沸腾条件下的高温吸附。活性炭-微波辐射去除苯酚的规律遵循其吸附特性,温度越高,吸附反应速度越快。
The wastewater samples being irradiated by microwave or not had been scanned by ultraviolet spectrophotometer,and the linear relationship between the concentration of COD and phenol in the wastewater sample irradiated by microwave had been analyzed. The results show that the main mechanism of strengthening removal efficiency of phenol in the process of activated carbon-microwave irradiation is accelerating adsorption of activated carbon because of the raising temperature caused by microwave irradiation, and isn＇ t microwave induced catalytic oxidation. The scanning electron microscope（SEM） of activated carbon being irradiated by microwave or not had been analyzed, the results show that the activated carbon in microwave field changes the structure of surface and internal hole because of ＂micro-field explosion＂, and its adsorption function is improved. Which is another reason of strengthening removal efficiency of phenol. The study also shows that the removal efficiency of phenol using activated carbon-microwave irradiation is better than that of the activated carbon at natural temperature ,but is worse than that of the adsorption at high temperature of solution boiling in a relatively short time,and that the law of removing phenol using activated carbon-microwave irradiation follows the adsorption character of activated carbon. The higher temperature, the quicker adsorption velocity.
出处
《环境工程学报》
CAS
CSCD
北大核心
2009年第1期67-71,共5页
Chinese Journal of Environmental Engineering
基金
湖南省科技厅资助项目(06FJ3185)
湖南省建设厅资助项目(湘建科字(2004)316号)
关键词
活性炭
微波辐射
苯酚
加速吸附
微域爆炸
activated carbon
microwave irradiation
phenol
acceleration adsorption
micro-field explosion
