中空多孔磁性Fe3O4/纤维素/海泡石微球异相Fenton催化降解亚甲基蓝

Hollow porous magnetic Fe3O4/cellulose/sepiolite microspheres as heterogeneous fenton catalysts for degradation of methylene blue

摘要:

为开发一种高效可循环利用的磁性生物质基催化剂，以微晶纤维素和纳米Fe3O4为原料，采用包埋法制得Fe3O4/纤维素（Fe3O4/MCC）溶液，将海泡石（SEP）掺入至Fe3O4/MCC中，制得磁性纤维素/海泡石复合微球（Fe3O4/MCC/SEP）。通过SEM、FTIR、VSM等对磁性微球的形貌、化学结构及磁性能进行了表征，探讨了微球作为芬顿催化剂对亚甲基蓝（MB）染料的降解效果及机理。结果表明，Fe3O4/MCC/SEP微球呈现出优异的中空多孔结构和超顺磁性。当MB浓度为10 mg/L、pH为3、Fe3O4/MCC/SEP的投入量为0.02 g，H2O2用量为5 mL时，反应240 min对MB的Fenton催化降解率高达99%。此外，经过5次循环利用后，对MB的降解率仍达83%。

Abstract:

For the development of an efficient and recyclable magnetic biomass-based catalyst, using microcrystalline cellulose and nano-Fe3O4 as ingredients, the magnetic Fe3O4/cellulose (Fe3O4/MCC) solution was prepared by the emulation method, and then the magnetic cellulose/sepiolite composite microspheres (Fe3O4/MCC/SEP) were formed along with the infiltration of sepiolite (SEP) in aqueous mixture solution. The morphology, structure and composition of the prepared Fe3O4/MCC/SEP were characterized by different techniques (SEM, FTIR, VSM, etc.). Subsequently, mechanism and performance of Fe3O4/MCC/SEP microspheres as heterogeneous Fenton catalysts for the oxidative degradation of methylene blue (MB) were analyzed. The results showed that the Fe3O4/MCC/SEP microsphere owed an excellent hollow porous structure and superparamagnetism. When the concentration of MB was10 mg/L, the amount of Fe3O4/MCC/SEP and H2O2 was 0.02 g and 5 mL at pH 3, the degradation rate of MB was as high as 99% at 240 min. Furthermore, the degradation rate of MB remaind 83% capacity after 5 recyclable cycles.