四硫化三铁-石墨烯复合催化剂降解木素结构单元模型物丁香酸

Degradation of Lignin Model Component-Syringic Acid by Fe3S4-Graphene Composite Catalyst

关键词:  多相类Fenton技术  Fe₃S₄  石墨烯  木素结构单元模型物  丁香酸

Key Words:heterogeneous Fenton technology  Fe₃S₄  graphene  lignin model component  syringic acid

摘要:以具有类Fenton催化活性的Fe₃S₄为主催化剂，采用原位生长的方式将其负载在较高比表面积的石墨烯载体上，制备出具有较高催化活性的Fe₃S₄-石墨烯（Fe₃S₄-G）复合催化剂。将该复合催化剂和H₂O₂构成多相类Fenton反应（Fe₃S₄-G-H₂O₂）体系，利用其催化产生的羟基自由基降解木素结构单元模型物丁香酸。研究了多相类Fenton反应过程中催化剂中铁元素与石墨烯质量比、催化剂用量、H₂O₂用量、pH值以及时间、温度等对降解效率的影响。结果表明，在催化剂中铁元素与石墨烯质量比为28∶1、pH值为3.02、催化剂用量为0.03 g、H₂O₂浓度为10 mmol/L时，丁香酸（32 mg/L）的降解率达到98.7%。

Abstract:In order to achieve a high catalytic activity，a composite catalyst was prepared by loading Fe₃S₄ of high Fenton-like catalytic activity on graphene carrier of high specific surface area through in-situ growth. The composite catalyst was then combined with hydrogen peroxide to form a heterogeneous Fenton reaction system. The hydroxyl radical generating from the system was used to degrade lignin model component-syringic acid. The effects of experimental parameters such as catalyst to carrier ratio，catalyst dosage，hydrogen peroxide dosage，pH，time and temperature on the degradation efficiency were studied in detail. Under the optimum reactive conditions(Fe/grapheme ratio 28∶1，pH value 3.02，catalyst amount 0.03 g，concentration of H₂O₂ 10 mmol/L)，the degradation rate of syringic acid (32 mg/L) reached 98.7%.