To realize resource utilization of agricultural and forestry waste biomass, non-precious bimetal biochar with oxygen-containing functional groups was prepared by the impregnation-sol-gel method with discarded rice and soybean straw as the base. The modified biochar with a high ability to remove cadmium from water was screened by controlling the pyrolysis temperature, biomass raw material, modifier proportion, and egg white liquid dosage. The results showed that when the pyrolysis temperature was 450 ℃ and the dosage of egg white was 10 mL, com...
