Fenton processes are a promising approach toward high-value chemical production from waste lignin. In this study, heterogeneous Fenton oxidation was employed to convert alkaline lignin into vanillin. The effects of Fe⁰, Fe²⁺, Fe³⁺, and H₂O₂ concentrations, temperature (25–50 °C), and reaction time (15–60 min) on vanillin production from lignin was investigated using response surface methodology under a three-level factorial design. The study reveals that the concentrations of Fe⁰, Fe²⁺, Fe³⁺, and H₂O₂ had an important effect on vanillin yield, whereas reaction temperature and time had positive effects on the process of vanillin production. Based on the numerical optimization and desirability function, the optimum conditions were 38.05 mg/L Fe⁰, 49.45 mg/L Fe²⁺, 71.35 mg/L Fe³⁺, and 1884.4 ppm H₂O₂ at 41.404 °C for 60 min at pH 3. Under these conditions, the vanillin yield obtained was 0.690%, which was increased by 2.59-fold from lignin. The experimental results agreed with the predicted values. We show that heterogeneous Fenton oxidation has the potential to convert lignin into high-value aromatic compounds when carried out under optimum conditions.

Fenton工艺是利用废木质素高价值化学生产的一种有前途的方法。在这项研究中，采用异质的Fenton氧化将碱性木质素转化为香兰素。使用响应面法研究了Fe ⁰，Fe 2 ⁺，Fe ³⁺和H ₂ O _2的浓度，温度（25–50°C）和反应时间（15–60 min）对木质素香兰素生产的影响。在三级析因设计下。研究表明，Fe ⁰，Fe 2 ⁺，Fe ³⁺和H ₂ O ₂的浓度对香兰素的产量具有重要影响，而反应温度和时间对香兰素的生产过程具有积极的影响。基于该数值优化和可取功能，最佳条件为38.05毫克/升的Fe ⁰，49.45毫克/升的Fe ²⁺，71.35毫克/ L的Fe ³⁺，和1884.4 ppm的ħ ₂ ö ₂在41.404℃下进行60分钟在pH 3下，在这些条件下，所获得的香兰素产率为0.690％，比木质素提高了2.59倍。实验结果与预测值吻合。我们表明，当在最佳条件下进行时，非均质Fenton氧化具有将木质素转化为高价值芳族化合物的潜力。