利用纳米级零价铁研究水溶液中2,4,6-三硝基甲苯的还原动力学
2,4,6-Trinitrotoluene reduction kinetics in aqueous solution using nanoscale zero-valent iron.
作者信息
Zhang Xin, Lin Yu-man, Chen Zu-liang
机构信息
School of Chemistry and Materials Science, Fujian Normal University, Fuzhou , Fujian Province, China.
出版信息
J Hazard Mater. 2009 Jun 15;165(1-3):923-7. doi: 10.1016/j.jhazmat.2008.10.075. Epub 2008 Oct 28.
The reduction of 2,4,6-trinitrotoluene (TNT) in aqueous solution using nanoscale zero-valent iron (nZVI) was investigated. The results showed that the pseudo-first order reaction law fit the reduction of TNT. The measured apparent rate constant (K(obs)) of TNT on nZVI (0.761 h(-1)) was 7.8-fold than on conventional iron powders (0.0979 h(-1)) at 303 K. The apparent activation energy (E(a)) of nZVI reducing TNT was found to be 24.85 KJ/mol, which was decreased by 60% compared to employing conventional iron powders. The apparent rate constant of TNT reduction on nZVI also can be improved by an increase in nZVI concentration, reaction temperature and a decrease of pH.
研究了使用纳米零价铁（nZVI）还原水溶液中的2,4,6-三硝基甲苯（TNT）。结果表明，伪一级反应定律适用于TNT的还原。在303 K时，TNT在nZVI上测得的表观速率常数（K(obs)）为0.761 h⁻¹，是传统铁粉（0.0979 h⁻¹）上的7.8倍。发现nZVI还原TNT的表观活化能（E(a)）为24.85 KJ/mol，与使用传统铁粉相比降低了60%。增加nZVI浓度、反应温度和降低pH值也可以提高TNT在nZVI上的还原表观速率常数。
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