利用自行合成的膨胀珍珠岩负载型纳米零价铁（EP-nZVI）去除偶氮染料酸性大红（AR）和甲基橙（MO）。考察了EP-nZVI质量浓度、初始pH、温度和单一染料初始质量浓度对EP-nZVI去除染料的影响。实验证明EP-nZVI可以快速高效地降解溶液中的AR和MO。SEM和XRD表征结果表明，负载于膨胀珍珠岩（EP）的纳米铁粒子具有良好的分散性；对照实验显示EP具有一定的吸附作用，EP-nZVI去除AR和MO的效果优于nZVI。动力学研究表明，EP-nZVI去除AR和MO是一个快速吸附同时发生氧化还原的过程，是受表面控制的反应。紫外-可见光谱分析表明，EP-nZVI通过断裂AR和MO分子中的偶氮基实现快速降解染料。

Expanded perlite supported nanoscale zero-valent iron (EP-nZVI) is synthesized and applied to the degradation of acid scarlet and methyl orange.The effects of EP-nZVI dosage,initial pH value,temperature and initial dyes concentration on the removal of acid scarlet or methyl orange are investigated.Excellent performances on the removal of dyes are observed.In 10 min comparison experiments,98.2% of acid scarlet and 98.3% of methyl orange are removed respectively by EP-nZVI,while only 83.3% of acid scarlet and 81.3% of methyl orange are removed by using nZVI alone,and only 13.8% of acid scarlet and 11.7% of methyl orange are removed by expanded perlite alone.The results by scanning electron microscopy (SEM) and X-ray diffraction (XRD) show that expanded perlite reduces the aggregation of nZVI.Both pseudo first-order and pseudo second-order kinetic models can be employed to describe the degradation of acid scarlet or methyl orange by EP-nZVI and an excellent fit with pseudo second-order model for the adsorption process is observed.The results from kinetics study indicate the removal of acid scarlet or methyl orange by EP-nZVI is a prompt adsorption and simultaneous redox process,also a surface-controlled reaction.UV-Vis absorption spectra for the mixed reaction solution of acid scarlet and methyl orange indicate that the azo bond of dyes is cleaved by EP-nZVI.In a sum,the degradation of acid scarlet and methyl orange by EP-nZVI shows excellent degradation efficiency.