CAJ | 학술논문

本文通过批-柱实验研究低压直流电流对已被NO3-钝化零价铁渗透中零价铁(ZVI)的催化活化,研究发现:加载12 V 低压直流电流后,阴极附近 TCE 的去除速率常数比钝化后 ZVI 的去除效率高出约4倍,低压直流电流可以催化 ZVI 去除 TCE,去除效果的增加和电压成正相关关系;同时,低压直流电流阴极可以活化已经钝化的 ZVI,活化后不加载电流时 ZVI 对 TCE 的去除效率仍是钝化后 ZVI 的去除效率的约3倍.经过 NO3-钝化后 ZVI 表面的氧化膜组成以 Fe3O4为主;但在加载低压直流电流后,ZVI 表面同时会有α-/β-FeOOH 生成,说明低压直流电可能会使 Fe3O4溶解还原.
본문통과비-주실험연구저압직류전류대이피NO3-둔화령개철삼투중령개철(ZVI)적최화활화,연구발현:가재12 V 저압직류전류후,음겁부근 TCE 적거제속솔상수비둔화후 ZVI 적거제효솔고출약4배,저압직류전류가이최화 ZVI 거제 TCE,거제효과적증가화전압성정상관관계;동시,저압직류전류음겁가이활화이경둔화적 ZVI,활화후불가재전류시 ZVI 대 TCE 적거제효솔잉시둔화후 ZVI 적거제효솔적약3배.경과 NO3-둔화후 ZVI 표면적양화막조성이 Fe3O4위주;단재가재저압직류전류후,ZVI 표면동시회유α-/β-FeOOH 생성,설명저압직류전가능회사 Fe3O4용해환원.
In this study, the batch-type experiment was used to investigate the depassivation of passivated zero-valent iron (ZVI) by electrical induced reduction (3, 6, 12 V; EIR). With 12 V electricity added, the first order degradation rate k of TCE was 4 times more than the k of the passivated ZVI, EIR is helpful to the TCE removal in ZVI PRB and this accelerate effect is roughly proportional to the electricity level. After EIR added, the k of the restored ZVI was still 3 times more than the k of the passivated ZVI. The most composition of the passivated ZVI surface is Fe3O4, but a lot of α- / β-FeOOH was generated after electricity added. This means that the dissolution and reduction of Fe3O4 during the EIR process.