Study on the effect of preparation conditions on the adsorption of Sb(Ⅲ)by biochar/PNPG composites
A series of biochar/poly(N-phenylglycine)(BC/PNPG)composite adsorbents were prepared by in-situ polymerization method through controlling the biochar pyrolysis temperature and N-phenylglycine/biochar(NPG/BC)mass ratio.The influence of the synthesis conditions on the adsorption performance of Sb(Ⅲ)was studied,and the adsorption mechanism was revealed by SEM,FT-IR and XPS.The results showed that the adsorption capacity of Sb(Ⅲ)increased with the increase of pyrolysis temperature,and the maximum was 7.55mg·g-1.The adsorption capacity of BC3/PNPG prepared under the conditions of pyrolysis temperature of 800℃,NPG/BC mass ratio of 5∶5,and acidic environment was 17.65mg·g-1,which was 2.3 times that of the pristine BC.The adsorption mechanism of the composite adsorbent for Sb(Ⅲ)included the chelation of aniline group with Sb(Ⅲ),the oxidation of Sb(Ⅲ)by protonated bipolarizers with positive charge,and the electrostatic interaction between positively charged PNPG with Sb(OH)6-.
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