Desulfurization and bio-regeneration of adsorbents with Magnetic P. delafieldii R-8 Cells

Superparamagnetic Fe3O4 nanoparticles are prepared with coprecipitation method followed by modification with ammonia oleate. Magnetic P. delafieldii R-8 cells can be prepared by mixing the cells with magnetite nanoparticles. Saturated magnetization of magnetic cells is about 7.41 emu/g. The pH value of magnetic suspension has significant influence on the desulfurization activity of magnetic cells. Desulfurization of the magnetic cells prepared with pH 7.0 magnetic suspension has similar activity with free cells. When the magnetic cells were used in the bioregeneration of desulfurization adsorbents Ag-Y, the concentration of dibenzothiophene (DBT) and 2-hydroxybiphenyl (2-HBP) with free cells is a little higher that that with magnetic cells. Adsorption capacity of the regenerated adsorbent is 93% that of the fresh one after being desorbed with magnetic P. delafieldii R-8, dried at 100 °C for 24 h and calcined in the air at 500 °C for 4 h.