摘要：Biochar has proven to effectively remove cadmium in the environment.In this study,three common solid wastes,such as corn stalks (CS),Chinese herbal residues (HR) and sludge (SL),were used as raw materials to produce biochar,which further was modified by adding thiourea.The cadmium sorption characteristics on the six kinds of biochar derived from different biomass sources were studied.The results showed that the isothermal sorption isotherms of cadmium on biochar were better fit by the Langmuir model.The sorption capacity and sorption rate of the modified-biochar were increased by 10%-15% compared with the non-modified-biochar.The sorption rates of the six biochar were in the range of 50%-90%,following the order of modified-HR > modi-fied-CS > HR > modified-SL > CS > SL.The results provide economical and environmentally friendly materials for the biochar production and for the effective cadmium remediation in the environment.
