La(OH)-modified magnetic pineapple biochar as novel adsorbents for efficient phosphate removal.

A series of La(OH)-modified magnetic pineapple biochar (Lax-MC) with different contents of La(OH) were prepared and used as phosphate adsorbents for the first time. With the increase of La(OH) content, the adsorption capacity for phosphate increased while the magnetic property decreased. La10-MC exhibited excellent magnetic property for easy recovery and high adsorption capacity up to 101.