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首页> 外文期刊>RSC Advances >Activation of peroxymonosulfate by iron-based catalysts for orange G degradation: role of hydroxylamine
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Activation of peroxymonosulfate by iron-based catalysts for orange G degradation: role of hydroxylamine

机译：用铁基催化剂对橙G降解的过氧键硫酸盐激活：羟胺的作用

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Magnetite nanoparticles (Fe _(3) O _(4) ) have received considerable and increasing attention and been applied as activators for peroxymonosulfate (PMS) to generate reactive radicals for degrading organic contaminants. However, the slow transformation of Fe( III )/Fe( II ) limits its repetitive and widespread application. Hence, hydroxylamine (NH _(2) OH), a common reducing agent, was introduced to a Fe _(3) O _(4) /PMS system to accelerate the conversion of Fe( III )/Fe( II ). With the addition of NH _(2) OH, orange G (OG) degradation was largely increased at pH 2.0–7.0, and the generation of reactive radicals (sulfate- and hydroxyl-radicals) was significantly promoted. NH _(2) OH was gradually degraded to N _(2) , N _(2) O, NO _(2) ~(?) , and NO _(3) ~(?) , while the eco-friendly gas, N _(2) , was considered as its major end product. It was surprising to find that the catalytic ability of Fe _(3) O _(4) soared gradually in the ten consecutive runs. The effectiveness of NH _(2) OH for Fe _(3) O _(4) , Fe _(2) O _(3) and iron sludge on activating PMS indicated its wide suitability for all the iron-based oxides/hydroxides. Continuous treatment of OG using 1.5 wt% Fe/Al _(2) O _(3) catalyst (iron sludge immobilized on Al _(2) O _(3) ) packed into a flow column reactor was performed, and no loss in activity over 30 d of operation was observed. Thus the present study provides a promising way to activate PMS for the rapid degradation of refractory organics and dispose the solid iron-based wastes.
机译：磁铁矿纳米颗粒（Fe _（3）O _（4））已得到相当大的和越来越多的关注，并作为过氧键硫酸盐（PMS）的活化剂应用，以产生用于降解有机污染物的活性自由基。然而，Fe（iii）/ Fe（ii）的缓慢转型限制了其重复和广泛的应用。因此，将羟胺（NH _（2）OH）（NH _（2）OH）引入Fe _（3）O _（4）/ PMS系统中，以加速Fe（III）/ Fe（II）的转化。随着NH _（2）oH的添加，橙g（og）降解在pH 2.0-7.0大部分增加，并且显着促进了活性自由基（硫酸盐和羟基）的产生。 NH _（2）哦逐渐降解到n _（2），n _（2）o，no _（2）〜（？），没有_（3）〜（？），而环保气体，N _（2）被认为是其主要最终产品。令人惊讶的是发现Fe _（3）O _（4）在连续十次运行中逐渐飙升的催化能力。用于Fe _（3）O _（4），Fe _（2）O _（3）和活性PMS的铁污泥的有效性表明其对所有铁基氧化物/氢氧化物的广泛适用性。使用1.5wt％Fe / Al _（2）o _（3）催化剂（将固定在填充到流动柱反应器中的Al _（2）O _（3）上的铁污泥）进行连续处理，并没有损失观察到30多次操作的活动。因此，本研究提供了激活PM的有希望的方法，以便快速降解耐火物质并处理固体铁基废物。

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