Zhang Shao-Peng, Chen Yu, Bai Shu-Qin, Liu Rui-Ping
School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China.
Key Laboratory of Drinking Water Science and Technology, Research Center of Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Huan Jing Ke Xue. 2019 Nov 8;40(11):5009-5014. doi: 10.13227/j.hjkx.201903182.
The wide application of traditional Fenton reactions was firmly restricted by the requirement for harsh acid conditions, as well as the inevitable generation of iron slurry. The FeOCl nanosheets, prepared by the chemical vapor transformation method, were used to degrade RhB via activation of HO. The FeOCl was characterized by a field emission scanning electron microscope (FE-SEM) and X-Ray Diffractometer (XRD), the results showed that FeOCl exhibited a fine crystal structure and nanosheet-like morphology, which was favorable for exposure of active sites. The results of degradation experiments showed that the RhB was totally removed within 15 min under the conditions of[HO]=1.67 mmol·L and[FeOCl]=200 mg·L. The initial pH plays a negative role in RhB degradation, and the initial pH increased from 3 to 7 as the RhB removal efficiency decreased from 100% to 84%. Typically, when the initial pH was 9, the RhB degradation sharply decreased to 57.6%. Compared with traditional Fenton reactions, the FeOCl/HO system widened the pH range, which resulted in superior organics removal even under a mild-acidic to medium pH condition. The quenching experiments demonstrated that the·OH was the major reactive oxygen species. Additionally, Electron Paramagnetic Resonance (EPR) results showed that intense DMPO-HO·signals were detected in the FeOCl/HO system, which further demonstrated the important role of·OH in RhB degradation.
传统芬顿反应的广泛应用受到苛刻酸性条件要求以及不可避免产生铁泥的严格限制。通过化学气相转化法制备的FeOCl纳米片用于通过激活HO降解RhB。用场发射扫描电子显微镜（FE-SEM）和X射线衍射仪（XRD）对FeOCl进行表征，结果表明FeOCl呈现出良好的晶体结构和纳米片状形态，有利于活性位点的暴露。降解实验结果表明，在[HO]=1.67 mmol·L和[FeOCl]=200 mg·L的条件下，RhB在15分钟内被完全去除。初始pH对RhB降解起负面作用，随着初始pH从3增加到7，RhB去除效率从100%降至84%。典型的是，当初始pH为9时，RhB降解急剧降至57.6%。与传统芬顿反应相比，FeOCl/HO体系拓宽了pH范围，即使在弱酸性至中性pH条件下也能实现更好的有机物去除。猝灭实验表明·OH是主要的活性氧物种。此外，电子顺磁共振（EPR）结果表明，在FeOCl/HO体系中检测到强烈的DMPO-HO·信号，这进一步证明了·OH在RhB降解中的重要作用。
