Fe0-C微电解去除地下水中2,4-DNT的影响因素

采用批实验研究初始pH值、溶解氧（DO）和地下水中常见的阴、阳离子等因素对Fe0-C微电解对地下水中2，4-二硝基甲苯（2，4-DNT）去除率的影响，并分析Fe0-C降解2，4-DNT的产物。结果表明，在pH=7，DO=0.23 mg·L-1的条件下，Fe0-C去除溶液中2，4-DNT有明显的效果，反应200 min时，去除率达到83.09%，比Fe0和C的去除率提高了74.56%和9.89%；酸性条件下有利于2，4-DNT去除，初始pH=5的条件下，溶液中2，4-DNT的去除率为82%，而初始pH=10时，2，4-DNT的去除率分别为64%；反应体系中含有较高浓度的溶解氧有利于2，4-DNT的去除，在DO=9.26 mg·L-1条件下，2，4-DNT的去除率比 DO=0.23 mg·L-1时提高了9.5%；地下水中一定浓度的阴（Cl-、SO2-4）、阳离子（Ca2+、Mg2+、Na+、K+）可以提高2，4-DNT的去除率，提高率小于10%。反应过程中2，4-DNT降解的产物包括2-氨基-4-硝基甲苯（2A4 NT）、4-氨基-2-硝基甲苯（4A2 NT）和2，4-二氨基甲苯（2，4-DAT）。

Influencing factors of degradation of 2,4-DNT in groundwater by Fe0-C

In this study, batch experiments were conducted to investigate the impact of initial pH, dissolved oxygen (DO), and common cations/anions on the reductive capabilities of Fe0-C for 2,4-dinitrotoluene (2,4-DNT), and the products from such a reaction were analyzed. Fe0-C removed 2,4-DNT remarkably at pH=7 and DO=0.23 mg·L-1.The removal efficiency reached 83.09% after 200 min.Compared to Fe0 and C singly, 2,4-DNT removal efficiency by the combined Fe0-C increased by 74.56%和9.89%.Acidic conditions favored the removal of 2,4-DNT.The results demonstrated that the removal rate of 2,4-DNT reached 82% when pH=5.When pH=10, the removal efficiency of 2,4-DNT was 64%.The removal rate increased 9.5% when DO increased from 0.23 mg·L-1 to 9.26 mg·L-1.Common cations and anions in groundwater influenced 2,4-DNT removal.The degradation products from 2,4-DNT reduction included 2A4 NT, 4A2 NT, and 2,4-DAT.