Photo-decomposition Characteristics of 2,4,6-Trinitrotoluene in a UV/$H_2O_2$ Process
kwon beum geun, Wonyong Choi, Jeyong Yoon · Journal of The Korean Society of Water and Wastewater · 2010
The decomposition of 2,4,6-trinitrotoluene (TNT) and the mass balance of nitrogen (N) species as products were investigated in a UV/H2O2system by varying pH, concentrations of , and . All experiments were conducted in a semi-batch system employing a 50 mL reaction vessel and a coil-type quartz-tube reactor. In contrast with previous studies employing batch mode, TNT decomposition in the semi-batch mode was proportionally enhanced by increasing concentration to 10 mM (0.034%), indicatingthat an inhibitory effect of excess on hydroxyl radical () can be negligible. N compounds are released as in the early stages of the reaction, but is rapidly oxidized to by means of . was also detected in this study and showed gradually the increase with increasing reaction time. In this study, production can involve the reduction of nitro group of TNT concurrent with the production of . Of the N species originating from TNT decomposition, 12 ~ 72% were inorganic forms (i.e. [] + [] + []). This result suggests that the large remaining N portions indicate that unidentified N compounds can exist.