Eosin Y as a common dye is often used for cotton, silk and other materials. However, Eosin Y is highly toxic and difficult to degrade. Typically, 20% is lost during the printing and dyeing process to produce organic dye wastewater, which can cause serious harm to the environment and human health. Current treatment methods do not satisfy the dual requirements of environmental protection and cost. Pyrite (FeS₂) is the most common sulfide gangue mineral and displays excellent photoelectric properties. We chose pyrite as a promising photocatalyst to degrade organic dye wastewater because of its Fe(Ⅱ) and Fe(III) components, which participate in the photo-Fenton reaction. In this study, we use a photocatalytic reaction device incorporating naturally oxidized pyrite as a photocatalytic material to degrade Eosin Y. More than 90% degradation was achieved, when either white or green light was used as the light source over 3 h, in the pH range was 6–8, with an initial concentration of Eosin Y of 10 mg/L. Surprisingly, even if the addition of the pyrite sample is very low, it can still be recycled. The reaction mechanism was explored by composition analysis, scanning electron microscopy-energy dispersive spectroscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance and radical trapping experiments. This study suggests a novel method use for the high-value utilization of sulfide tailings.

Eosin Y 作为一种常见的染料，常用于棉、丝等材料。然而，伊红Y具有剧毒且难以降解。通常有20%在印染过程中流失，产生有机染料废水，对环境和人类健康造成严重危害。目前的处理方法不能满足环保和成本的双重要求。黄铁矿 (FeS ₂) 是最常见的硫化脉石矿物，具有优异的光电性能。我们选择黄铁矿作为一种有前途的光催化剂来降解有机染料废水，因为它的 Fe(Ⅱ) 和 Fe(III) 组分参与光芬顿反应。在这项研究中，我们使用一种光催化反应装置，结合自然氧化的黄铁矿作为光催化材料来降解曙红 Y。当使用白光或绿光作为光源超过 3 小时，在 pH 值下，降解率超过 90%范围为 6-8，伊红 Y 的初始浓度为 10 mg/L。令人惊讶的是，即使黄铁矿样品的添加量很低，它仍然可以回收利用。通过成分分析、扫描电镜-能谱、X射线光电子能谱、电子顺磁共振和自由基捕获实验。本研究为硫化尾矿的高值化利用提出了一种新方法。