Currently existing Fenton-like catalysts were limited in wastewater treatment owing to their potential transition-metal poisoning, narrow applicable pH range and high dependence on external energy excitation. In this work, the MgNCN/MgO nanocomposites were firstly synthesized by a facile one-pot calcination of melamine and basic magnesium carbonate, and used as novel H₂O₂ activator for antibiotic removal. It was found that the MgNCN/MgO composite calcined at 550°C with the mass ratio of melamine to basic magnesium carbonate at 2:1, exhibited an excellent catalytic ability to tetracycline (TC) degradation in a wide pH range of 4-10 without any external energy input. More than 90% of TC (100 mL, 50 mg/L) could be degraded within 30 min by 10 mg of the nanocomposite in the presence of 0.2 mL of 30 wt% H₂O₂. Based on the experimental results, it was concluded that the Mg-N coordination between MgNCN and MgO in MgNCN/MgO nanocomposites activated H₂O₂ to produce primary singlet oxygen (¹O₂) and minor hydroxyl radicals (·OH), responding for TC degradation. In addition, the degradation pathways of TC were deduced by determining the generated intermediates during the degradation process. This work provided a novel idea for designing transition-metal-free catalysts for nonradical activation of H₂O₂ in the absence of external energy excitation.

由于其潜在的过渡金属中毒，适用的pH范围狭窄以及对外部能量激发的高度依赖，目前现有的Fenton类催化剂在废水处理方面受到限制。在这项工作中，MgNCN / MgO纳米复合材料首先通过三聚氰胺和碱性碳酸镁的一锅法轻松煅烧合成，并用作新型H ₂ O _2。去除抗生素的活化剂。发现在550°C下煅烧的MgNCN / MgO复合材料，三聚氰胺与碱性碳酸镁的质量比为2：1，在4-10的宽pH范围内显示出优异的四环素（TC）降解催化能力。任何外部能量输入。在存在0.2 mL的30 wt％H ₂ O ₂的情况下，10 mg的纳米复合材料可在30分钟内降解90％以上的TC（100 mL，50 mg / L）。根据实验结果，可以得出结论，MgNCN / MgO纳米复合物中MgNCN和MgO之间的Mg-N配位活化了H ₂ O ₂产生初级单重态氧（¹ O ₂）和次要的羟基（·OH），从而导致TC降解。另外，通过确定降解过程中产生的中间体，推导了TC的降解途径。这项工作为设计无过渡金属的催化剂提供了一种新颖的想法，该催化剂用于在没有外部能量激发的情况下对H ₂ O ₂进行非自由基活化。