The common preparation methods for lanthanum-modified biochar are summarized,the advantages and disadvantages of different preparation methods are compared,and the impregnation and co-precipitation methods are described emphatically according to the experiments and practical applications.The adsorption mechanism of lanthanum-modified biochar for environmental pollutants is clarified in terms of electrostatic effect,ion exchange,complexation,etc.The problems that may exist in the practical application of lanthanum-modified biochar and the development direction in the future are also pointed out.
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