Catalytic oxidative removal of 2,4-dichlorophenol by simultaneous use of horseradish peroxidase and graphene oxide/Fe3O4 as catalyst
Catalytic oxidative removal of 2,4-dichlorophenol by simultaneous use of horseradish peroxidase and graphene oxide/Fe3O4 as catalyst
复制标题
辣根过氧化物酶与氧化石墨烯/Fe3O4同时催化氧化脱除2,4-二氯苯酚
DOI：
10.1016/j.cej.2014.05.136
复制
发表时间：
2014
影响因子：
15.1
通讯作者：
Heqing Tang
中科院分区：
文献类型：
--
作者：
Jia Huang;Qing Chang;Yaobin Ding;Xiaoyan Han;Heqing Tang
A composite of graphene oxide and nano-Fe3O4(GO/Fe3O4) was prepared and characterized as an artificial enzyme-like catalyst. By combining the artificial enzyme-like catalyst and a natural enzyme horseradish peroxidase (HRP) as a binary enzymatic catalyst, the catalytic oxidative removal of 2,4-dichlorophenol (2,4-DCP, 50 mg L−1) was achieved in the presence of H2O2(0.7 mmol L−1) in aqueous media at near neutral pH value (pH 6.4) and room temperature. It was observed that the single use of HRP and GO/Fe3O4produced a 2,4-DCP removal of 35% and 9%, respectively, whereas their simultaneous use yielded a removal as high as 93%. This indicates that there is a synergistic effect between GO/Fe3O4and HRP. The effects of initial pH value, temperature, initial concentrations of HRP, GO/Fe3O4and H2O2were optimized. The intermediate products during the catalytic oxidation of 2,4-DCP in the system of GO/Fe3O4–HRP were identified by gas chromatography/mass spectrometry, and the possible degradation pathway of 2,4-DCP was proposed. In addition, the GO/Fe3O4composite could be easily separated from the reaction solution with a magnetic field, and the recycled GO/Fe3O4showed a good catalytic stability.
