Optimization of Preparation Conditions for Biochar-Loaded Nano-Zero-Valent Iron With Chlorinated Hydrocarbons

The peanut shell biochar-loaded nano-zero-valent iron material (nZVI/BC) was prepared by liquid phase reduction method. The structural properties of the material were obtained by elemental analysis, specific surface area and scanning electron microscopy. The effect of nZVI/BC materials on the removal of pollutants in simulated groundwater prepared by mixing three common chlorinated organic pollutants (chloroform, chlorobenzene, trichloroethylene) was studied. The results show that the BC yield of 300℃ pyrolysis is up to 44.07%, and the structure is relatively intact. The nZVI has a uniform load on the surface of the peanut shell BC, and there is no large agglomeration, showing a chain structure. When the dosage is the same, the composite with carbon to iron ratio of 2:1 has better effect on the overall removal of mixed pollutants. The removal rate of chloroform is 66.59%, trichloroethylene is 72.40%, and chlorobenzene is 74.85%.