While extensive studies found that dissociative and iron mineral-adsorbed humic acid (HA) could either stimulate or inhibit Fenton-like processes, little was known about the influence of iron mineral-coprecipitated HA on Fenton-like reactions. Here, goethite and HA (Gt-HA) coprecipitates having different C:Fe molar ratios (C:Fe=0.16~0.99) were biologically prepared, and for the first time, investigated for their abilities of H₂O₂ activation and catalytic degradation of sulfanilamide. For system containing Gt-HA with the optimal C:Fe ratio of 0.30, over 91.1% of sulfanilamide (10 mg/L) was removed in 2 h, which was 46.2% higher than that of the control Gt system. Additionally, H₂O₂ decomposition, •OH production, and organic carbon removal in Gt-HA systems were all more efficient than those in Gt system. Higher carbon moieties stability and lower micropore surface area of Gt-HA decreased the competition for •OH and H₂O₂, thus helped to improve degradation efficiency. Electrochemical analysis, quenching experiments, and Fe species detection showed that the coprecipitated HA could serve as electron shuttle and complex with Fe(III) mainly via carboxyl groups at octahedral sites to improve Fe(III)/Fe(II) transformation. This study improved our understanding of Fe(III)/Fe(II) cycling in Fe-C coprecipitates and demonstrated the potential of developing Fe-C coprecipitates as efficient catalysts in Fenton-like processes.

尽管广泛的研究发现，离解性和铁矿物质吸附的腐殖酸（HA）可以刺激或抑制Fenton样过程，但对于铁矿物质共沉淀的HA对Fenton样反应的影响知之甚少。在此，生物制备了具有不同C：Fe摩尔比（C：Fe = 0.16〜0.99）的针铁矿和HA（Gt-HA）共沉淀物，并首次研究了它们的H ₂ O ₂活化和催化降解能力。磺胺。对于包含最佳C：Fe比为0.30的Gt-HA的系统，在2小时内去除了超过91.1％的磺胺（10 mg / L），比对照Gt系统高出46.2％。另外，H ₂ O ₂与Gt系统相比，Gt-HA系统的分解，•OH生成和有机碳去除效率更高。Gt-HA的较高碳部分稳定性和较低的微孔表面积可减少对•OH和H ₂ O ₂的竞争，从而有助于提高降解效率。电化学分析，猝灭实验和Fe种类检测表明，共沉淀的HA主要通过八面体位点的羧基充当电子穿梭和与Fe（III）的络合物，以改善Fe（III）/ Fe（II）的转化。这项研究提高了我们对Fe-C共沉淀物中Fe（III）/ Fe（II）循环的理解，并证明了开发Fe-C共沉淀物作为类Fenton工艺中有效催化剂的潜力。