Fenton reaction based on hydroxyl radicals (

) is effective for environment remediation. Nevertheless, the conventional Fenton reaction has several disadvantages, such as working at acidic pH, producing iron-containing sludge, and the difficulty in catalysts reuse. Fenton-like reaction using solid catalysts rather than Fe²⁺ has received increasing attention. To date, Fe-based catalysts have received increasing attention due to their earth abundance, good biocompatibility, comparatively low toxicity and ready availability, it is necessary to review the current status of Fenton-like catalysts. In this review, the recent advances in Fe-based Fenton-like catalysts were systematically analyzed and summarized. Firstly, the various preparation methods were introduced, including template-free methods (precipitation, sol gel, impregnation, hydrothermal, thermal, and others) and template-based methods (hard-templating method and soft-templating method); then, the characterization techniques for Fe-based catalysts were summarized, such as X-ray diffraction (XRD), Brunauer, Emmett and Teller (BET), SEM (scanning electron microscopy)/TEM (transmission electron microscopy)/HRTEM (high-resolution TEM), FTIR (Fourier transform infrared spectroscopy)/Raman, XPS (X-ray photoelectron spectroscopy), ⁵⁷Fe Mössbauer spectroscopy etc.; thirdly, some important conventional Fe-based catalysts were introduced, including iron oxides and oxyhydroxides, zero-valent iron (ZVI) and iron disulfide and oxychloride; fourthly, the modification strategies of Fe-based catalysts were discussed, such as microstructure controlling, introduction of support materials, construction of core-shell structure and incorporation of new metal-containing component; Finally, concluding remarks were given and the future perspectives for further study were discussed. This review will provide important information to further advance the development and application of Fe-based catalysts for water treatment.

中文翻译：

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铁基Fenton状水处理催化剂：制备，表征和改性

基于羟基自由基的Fenton反应（

）对环境修复有效。然而，常规的芬顿反应具有几个缺点，例如在酸性pH下工作，产生含铁污泥以及难以再利用催化剂。使用固体催化剂而不是Fe ^2+的Fenton类反应受到越来越多的关注。迄今为止，铁基催化剂由于其土壤丰度，良好的生物相容性，相对较低的毒性和易于获得而受到越来越多的关注，有必要回顾类Fenton催化剂的现状。在这篇综述中，系统地分析和总结了铁基类芬顿催化剂的最新进展。首先介绍了各种制备方法，包括无模板法（沉淀，溶胶凝胶，浸渍，水热，热等）和基于模板的方法（硬模板法和软模板法）；然后，总结了铁基催化剂的表征技术，例如X射线衍射（XRD），Brunauer，Emmett和Teller（BET），⁵⁷ FeMössbauer光谱学等；第三，介绍了一些重要的常规铁基催化剂，包括氧化铁和羟基氧化物，零价铁（ZVI）和二硫化铁和氯氧化物。第四，讨论了铁基催化剂的改性策略，如微观结构控制，载体材料的引入，核-壳结构的构建以及新的含金属组分的掺入等。最后，作了总结，并讨论了进一步研究的未来前景。这篇综述将提供重要的信息，以进一步推进水处理用铁基催化剂的开发和应用。