Treatment of dinitrotoluene sulfonates in TNT red water by active carbon supported and active coke supported NZVI
活性焦和活性炭负载纳米铁处理TNT红水中的二硝基甲苯磺酸钠

Activated carbon supported nanoscale zero-valent iron (NZVI/AC) and activated coke supported nanoscale zero-valent iron (NZVI/ACoke) were prepared using liquid phase reducing method.Their transformation capacities of 2,4-DNT-3-SO3Na and 2,4-DNT-5-SO3Na,a kind of degradation refractory nitro aromatic compounds,were compared.The experimental results revealed that activated coke was a better choose for supporting NZVI than activated carbon for the larger relative effective surface area and pore volume as well as enhancing the synergistic action between NZVI and carrier.NZVI/ACoke showed a higher transformation capacity of 2,4-dinitrotoluene sulfonates per unit area than NZVI/AC at first,but it decreased as the amount of NZVI/ACoke increased.However,the area-modified transformation capacities of NZVI/AC almost did not change with increasing amounts of NZVI/AC,and the removal efficiencies of 2,4-dinitrotoluene sulfonates were higher than those gained by NZVI/ACoke.When combined with coagulation-sedimentation,NZVI/ACoke showed a higher transformation capacity of 2,4-DNT-5-SO3Na per unit area than NZVI/AC,but a lower transformation capacity of 2,4-DNT-3-SO3Na than NZVI/AC.