College of Geography and Environment, Shandong Normal University, Jinan, Shandong, 250014, China.
Guangdong Provincial Key Laboratory of Environmental Health and Land Resource, Zhaoqing University, Zhaoqing, 526061, China.
Environ Pollut. 2022 Jan 15;293:118565. doi: 10.1016/j.envpol.2021.118565. Epub 2021 Nov 23.
Fe-based catalysts as low-cost, high-efficiency, and non-toxic materials display superior catalytic performances in activating hydrogen peroxide, persulfate (PS), peracetic acid (PAA), percarbonate (PC), and ozone to degrade organic contaminants in aqueous solutions. They mainly include ferrous salts, zero-valent iron, iron-metal composites, iron sulfides, iron oxyhydroxides, iron oxides, and supported iron-based catalysts, which have been widely applied in advanced oxidation processes (AOPs). However, there is lack of a comprehensive review systematically reporting their synthesis, characterization, and applications. It is imperative to evaluate the catalytic performances of various Fe-based catalysts in diverse AOPs systems and reveal the activation mechanisms of different oxidants by Fe-based catalysts. This work detailedly summarizes the synthesis methods and characterization technologies of Fe-based catalysts. This paper critically evaluates the catalytic performances of Fe-based catalysts in diverse AOPs systems. The effects of solution pH, reaction temperature, coexisting ions, oxidant concentration, catalyst dosage, and external energy on the degradation of organic contaminants in the Fe-based catalyst/oxidant systems and the stability of Fe-based catalysts are also discussed. The activation mechanisms of various oxidants and the degradation pathways of organic contaminants in the Fe-based catalyst/oxidant systems are revealed by a series of novel detection methods and characterization technologies. Future research prospects on the potential preparation means of Fe-based catalysts, practical applications, assistive technologies, and impact in AOPs are proposed.
铁基催化剂作为一种廉价、高效、无毒的材料，在活化过氧化氢、过硫酸盐（PS）、过氧乙酸（PAA）、过碳酸盐（PC）和臭氧方面表现出优异的催化性能，可用于降解水溶液中的有机污染物。它们主要包括亚铁盐、零价铁、铁金属复合材料、铁硫化物、铁氢氧化物、氧化铁和负载型铁基催化剂，已广泛应用于高级氧化工艺（AOPs）中。然而，目前缺乏对其合成、表征和应用进行全面综述的报道。因此，有必要评估各种铁基催化剂在不同 AOPs 体系中的催化性能，并揭示铁基催化剂对不同氧化剂的活化机制。本文详细总结了铁基催化剂的合成方法和表征技术，并对铁基催化剂在不同 AOPs 体系中的催化性能进行了批判性评价。讨论了溶液 pH 值、反应温度、共存离子、氧化剂浓度、催化剂用量和外加能对铁基催化剂/氧化剂体系中有机污染物降解和铁基催化剂稳定性的影响。通过一系列新的检测方法和表征技术，揭示了各种氧化剂的活化机制以及铁基催化剂/氧化剂体系中有机污染物的降解途径。最后，提出了铁基催化剂的潜在制备方法、实际应用、辅助技术以及在 AOPs 中的影响等未来研究前景。
