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首页> 外文期刊>Environmental Science & Technology >Role of humic acid and quinone model compounds in bromate reduction by zerovalent iron
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Role of humic acid and quinone model compounds in bromate reduction by zerovalent iron

机译：腐殖酸和醌模型化合物在零价铁还原溴酸盐中的作用

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摘要

Experiments were conducted to examine the, role of humic acid and quinone model compounds in;bromate reduction by Fe(0). The reactivity of Fe(0) toward bromate declined by a factor of 1.3-2.0 in the presence of humic acid. Evidence was obtained that the quick complexation of humic acid with iron species and its adsorption passivated the iron surface and decreased the rate of bromate reduction by Fe(0). On the other hand, in the long run, the reduced functional groups present in humic acid were observed to regenerate Fe(II) and reduce bromate abiotically. Compared with the case of humic acid only, the simultaneous presence of Fe(III) and humic acid significantly increased the bromate removal rate. Fe(III)/Fe(II) acted as a catalyst in the oxidation of humic acid by bromate. Anthraquinone-2,6-disulfonate (AQDS) and lawsone did not cause any significant effect on the bromate reduction rate by Fe(0). However, the redox reactivity of lawsone in the presence of Fe(III) was evident, while AQDS did not show any under the tested conditions. The difference was attributable to the presence/absence of reducing functional groups in the model compounds. The electron spin resonance further demonstrated that the redox functional groups in humic acid are most likely quinone-phenol moieties. Although the bromate reduction rate by regenerated Fe(II) is a few times slower than that by Fe(0), the reactive Fe(II) can be, alternatively, reductively formed to maintain iron surface activation and bromate reduction to prolong the lifetime of the zerovalent iron.
机译：进行实验以检查腐殖酸和醌模型化合物在Fe（0）溴酸盐还原中的作用。在腐殖酸存在下，Fe（0）对溴酸盐的反应性降低了1.3-2.0倍。获得的证据表明，腐殖酸与铁种类的快速络合及其吸附钝化了铁表面，并降低了Fe（0）对溴酸盐的还原速率。另一方面，从长远来看，观察到腐殖酸中存在的还原性官能团可再生Fe（II）并非生物还原溴酸盐。与仅腐殖酸的情况相比，Fe（III）和腐殖酸的同时存在显着提高了溴酸盐的去除率。 Fe（III）/ Fe（II）在溴酸盐对腐殖酸的氧化中起催化剂的作用。蒽醌2,6-二磺酸盐（AQDS）和Lawone对Fe（0）对溴酸盐的还原速率没有造成任何重大影响。但是，在Fe（III）存在的情况下，罗生烷酮的氧化还原反应性是明显的，而在测试条件下，AQDS没有显示任何反应。差异归因于模型化合物中是否存在还原性官能团。电子自旋共振进一步证明，腐殖酸中的氧化还原官能团最可能是醌-酚部分。尽管再生Fe（II）的溴酸盐还原速率比Fe（0）慢几倍，但也可以还原性形成反应性Fe（II），以维持铁表面活化和溴酸盐还原，从而延长铁的使用寿命。零价铁。

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