Preparation of Biochar Composite Graphene Oxide for the Removal of Boron in Simulated Fracturing Flowback Fluid

The treatment of boron in fracturing backflow fluid is a widely studied issue in oil and gas resource extraction. In this work, the material of canola straw-derived biochar composite graphene oxide (BC@GO) was produced and used for boron removal. Then, a series of characterization and batch adsorption experiments were conducted on the material. The results show that the composite material has good adsorption capacity, and the maximum adsorption capacity is 168mg/g at the initial concentration of 300 mg/L at pH = 7. The results of kinetic and thermodynamic fitting showed that the boron adsorption by BC@GO conforms to the pseudo-second-order kinetics model and Freundlich model. In addition, it was found that the material still has a good adsorption capacity in batch adsorption experiments of hydraulic fracturing simulated water. Therefore, BC@GO is a new boron removal material with good application prospects.