| 加热与零价铁活化S2O2-8氧化降解偶氮染料AO7的研究 |
| 摘要点击 2794 全文点击 2157 投稿时间：2010-11-30 修订日期：2011-03-10 |
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| 中文关键词 硫酸根自由基 热活化 ZVI活化 热与ZVI联合活化 AO7降解率 降解动力学 |
| 英文关键词 sulfate free radical heat activation ZVI activation heat/ZVI joint activation AO7 degradation rates degradation kinetics |
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| 中文摘要 |
| 以偶氮染料酸性橙AO7为目标污染物，研究了单独的热活化及零价铁（ZVI）活化S2O2-8（PS）降解AO7过程温度、PS浓度及ZVI投加量对AO7降解率的影响，并将2种活化方式进行了对比，最终将其联合以期获得最好的降解效果.结果表明，热活化体系对AO7的降解符合一级动力学，其反应速率随温度（室温～90℃）升高而增加，随PS浓度（1～12 mmol·L-1）升高而增加.ZVI投加量为0.2 g时，ZVI活化体系对AO7的氧化降解率最高，90 min时达到95.6%.通过加热活化体系与ZVI活化体系的比较可以看出ZVI活化是更有效的PS活化方式.热与ZVI联合活化体系对AO7的降解是两段一级动力学过程，它们的协同活化效应增加了AO7降解反应的效率，热活化体系中ZVI的加入使加热活化体系对AO7降解的表观活化能Ea由原来的130.26 kJ·mol-1降低到27.70 kJ·mol-1，使反应条件变得温和。 |
| 英文摘要 |
| Effects of temperatures, PS concentrations and ZVI dosages on AO7 decomposition were investigated in sole heat and ZVI activating systems. The degradation results of two systems were compared for selecting a better activating way for AO7 degradation and finally the two activating ways were combined for getting the optimal AO7 degradation efficiency. The degradation of AO7 by Heat/PS systems followed pseudo first-order kinetics. The reaction rates increased with increasing reaction temperatures (elevated from room temperature to 90℃) and also increased when initial PS concentrations varied from 1 to 12 mmol·L-1. For ZVI activating systems(ZVI/PS systems), the degradation rate of AO7 was the highest when ZVI dose was 0.2 g, and it reached to 95.6% within 90 min. Comparing ZVI/PS systems with Heat/PS systems, the results showed that the ZVI activation was a more effective way to activate PS than the heat activation for AO7 degradation. AO7 degradation processes by ZVI/heat/PS systems were two-stage pseudo first-order kinetic processes, and the combining of two activating ways significantly increased the reaction rates. By the addition of ZVI to the Heat/PS system, the apparent activation energy Ea of AO7 degradation reduced from the original 130.26 kJ·mol-1 to 27.70 kJ·mol-1. |
