Single-atom site catalysts (SACs) can maximize the utilization of active metal species and provide an attractive way to regulate the activity and selectivity of catalytic reactions. The adjustable coordination configuration and atomic structure of SACs enable them to be an ideal candidate for revealing reaction mechanisms in various catalytic processes. The minimum use of metals and relatively tight anchoring of the metal atoms significantly reduce leaching and environmental risks. Additionally, the unique physicochemical properties of single atom sites endow SACs with superior activity in various catalytic processes for environmental remediation (ER). Generally, SACs are burgeoning and promising materials in the application of ER. However, a systematic and critical review on the mechanism and broad application of SACs-based ER is lacking. Herein, we review emerging studies applying SACs for different ERs, such as eliminating organic pollutants in water, removing volatile organic compounds, purifying automobile exhaust, and others (hydrodefluorination and disinfection). We have summarized the synthesis, characterization, reaction mechanism and structural-function relationship of SACs in ER. In addition, the perspectives and challenges of SACs for ER are also analyzed. We expect that this review can provide constructive inspiration for discoveries and applications of SACs in environmental catalysis in the future.

单原子位点催化剂（SACs）可以最大限度地利用活性金属物种，并为调节催化反应的活性和选择性提供了一种有吸引力的方法。SACs 的可调节配位构型和原子结构使其成为揭示各种催化过程中反应机制的理想候选者。金属的最少使用和金属原子的相对紧密的锚定显着降低了浸出和环境风险。此外，单原子位点的独特物理化学性质使 SAC 在各种环境修复 (ER) 催化过程中具有优异的活性。一般来说，SACs 是在 ER 应用中新兴且有前途的材料。然而，缺乏对基于 SAC 的 ER 的机制和广泛应用的系统和批判性评价。在此处，我们回顾了将 SAC 应用于不同 ER 的新兴研究，例如消除水中的有机污染物、去除挥发性有机化合物、净化汽车尾气等（加氢脱氟和消毒）。我们总结了ER中SACs的合成、表征、反应机理和结构-功能关系。此外，还分析了 SAC 对 ER 的前景和挑战。我们希望这篇综述能为未来SACs在环境催化中的发现和应用提供建设性的启示。SACs在ER中的反应机理和结构-功能关系。此外，还分析了 SAC 对 ER 的前景和挑战。我们希望这篇综述能为未来SACs在环境催化中的发现和应用提供建设性的启示。SACs在ER中的反应机理和结构-功能关系。此外，还分析了 SAC 对 ER 的前景和挑战。我们希望这篇综述能为未来SACs在环境催化中的发现和应用提供建设性的启示。