The Fenton technology used for treating formaldehyde-containing wastewater (HCHO) has limitations in terms of pH, efficiency, and cost. To address these issues, a Fe-HT Fenton-like catalyst was developed in this study. This catalyst combines active Fe with walnut shell biochar (HT) that contains surface defects, resulting in a highly effective solution for the rapid purification of formaldehyde wastewater in complex environments. The carbon defects on the HT surface play a crucial role in stabilizing the active Fe binding, while the appropriate loading of Fe further enhances the specific surface area of HT. Additionally, the porous structure of HT provides ample contact sites for formaldehyde. Furthermore, the Fe-HT catalyst exhibits superparamagnetism, allowing for convenient recovery of the catalyst after use. Experimental results demonstrate that Fe-HT achieves an impressive 90% degradation rate for systems containing HCHO concentrations ranging from 200 to 800 mg/L. The effects of feed ratio, pH, and formaldehyde concentration on the performance of Fe-HT were thoroughly investigated. Moreover, a possible mechanism for the degradation of HCHO by the Fe-HT Fenton-like catalyst was proposed. The environmentally friendly catalyst developed in this study boasts numerous advantages, including low cost, high treatment capacity for wastewater, and strong adaptability to complex wastewater environments.

中文翻译：

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Fe与高表面缺陷核桃壳生物炭在类芬顿反应中快速降解甲醛


用于处理含甲醛废水 (HCHO) 的芬顿技术在 pH 值、效率和成本方面存在局限性。为了解决这些问题，本研究开发了一种 Fe-HT 类芬顿催化剂。该催化剂将活性铁与含有表面缺陷的核桃壳生物炭（HT）相结合，为复杂环境中甲醛废水的快速净化提供了高效的解决方案。 HT表面的碳缺陷对于稳定活性Fe结合起着至关重要的作用，而适当的Fe负载进一步提高了HT的比表面积。此外，HT 的多孔结构为甲醛提供了充足的接触位点。此外，Fe-HT催化剂表现出超顺磁性，可以在使用后方便地回收催化剂。实验结果表明，对于 HCHO 浓度范围为 200 至 800mg/L 的系统，Fe-HT 的降解率高达 90%。深入研究了进料比、pH 值和甲醛浓度对 Fe-HT 性能的影响。此外，还提出了 Fe-HT 类芬顿催化剂降解 HCHO 的可能机制。本研究开发的环保型催化剂具有成本低、废水处理能力高、对复杂废水环境适应性强等优点。