Lee S J, Son H S, Lee H K, Zoh K D
Department of Environmental Health, Graduate School of Public Health, Seoul National University, 28 Yeungeon-Dong, Chongno-Gu, Seoul, 110-799, Korea.
Water Sci Technol. 2002;46(11-12):139-45.
This study was undertaken to examine the degradation of TNT, RDX and HMX in a circular photocatalytic reactor with TiO2 as a photocatalyst. We examined the impact of parameters such as the initial concentration, initial pH of solution on rates of photocatalized transformation, and the mineralization. The results showed that photocatalysis is an effective process for the degradation of TNT, RDX and HMX. They could be comoletely degraded in 150 min with 1.0 g/L TiO2 at pH 7. An increase in the photocatalytic degradation of HMX was noticed with decreasing initial HMX. The rates of RDX and HMX degradation were greater in neutral pH than in acidic and alkaline conditions. In case of TNT degradation, the rate of degradation was the fastest at pH 11. Approximately 82% TOC decrease in the TNT degradation was achieved after 150 min, whereas TOC decrease in RDX and HMX was 24% and 59%, respectively. Nitrate, nitrite, and ammonium ions were detected as the nitrogen byproducts from the photocatalysis, and more than 50% of the total nitrogen was recovered as nitrate ion in every explosives.
本研究旨在考察以TiO₂作为光催化剂的圆形光催化反应器中TNT、RDX和HMX的降解情况。我们研究了诸如初始浓度、溶液初始pH值等参数对光催化转化速率以及矿化作用的影响。结果表明，光催化是降解TNT、RDX和HMX的有效过程。在pH值为7、TiO₂浓度为1.0 g/L的条件下，它们能在150分钟内完全降解。随着初始HMX浓度的降低，HMX的光催化降解率有所增加。RDX和HMX在中性pH条件下的降解速率比在酸性和碱性条件下更快。对于TNT降解，在pH值为11时降解速率最快。TNT降解150分钟后，TOC降低了约82%，而RDX和HMX的TOC降低率分别为24%和59%。光催化产生的含氮副产物检测到有硝酸根离子、亚硝酸根离子和铵离子，每种炸药中总氮的50%以上以硝酸根离子形式回收。
