Promotion of higher synthesis temperature for higher-efficient removal of antimonite and antimonate in aqueous solution by iron-loaded porous biochar. (November 2022)

• Record Type: Journal Article
• Authors: Zhang, Liping; Dong:, Yingbo; Liu, Junfei; Liu, Wei; Lu, Yanrong; Lin, Hai
• Is Part Of: Bioresource technology. Volume 363(2022)
• Publication Date: 2022-11
• Subjects: Iron-loaded porous biochar -- Co-pyrolysis -- Potassium ferrate -- Prepared temperature -- Antimony; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2022.127889
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: The FPBC by co-pyrolysis using sawdust and K2 FeO4 was synthesized at 500 and 800 °C. The SSA of FPBC800 (515.49 m 2 ·g −1 ) is 5.5-fold that of FPBC500 (94.02 m 2 ·g −1 ). The Fe3 O4 is purely loaded on FPBC500, but Fe 0 and Fe3 C are formed on FPBC800. FPBC800 shows the maximum removal amount of Sb(III)/Sb(V) with 144.48/45.29 mg·g −1 . Sb(III) adsorbed on FPBC is oxidized to Sb(V), moreover, Fe 0 on FPBC800 catalyzes it. Abstract: Iron-loaded porous biochar (FPBC) was synthesized by co-pyrolysis method using sawdust and potassium ferrate at 500 (FPBC500) and 800°C (FPBC800), then characterized and applied to eliminate antimonite (Sb(III)) and antimonate (Sb(V)) in aqueous. Due to alkali erosion on feedstock and K/Fe-oxides attacking carbon, FPBC800 obtained a larger specific surface area (SSA) (515.49 m 2 ·g −1 ) that was 5.48-fold that of PFBC500, meaning the exposure of more active sites. Fe3 O4 was formed on FPBC500, but Fe 0 and Fe3 C were generated on FPBC800. FPBC800 showed the optimal sorption performance for Sb(III) (144.48 mg·g −1 ) and Sb(V) (45.29 mg·g −1 ), which were much higher than that of FPBC500. Noteworthily, Sb(III) anchored on FPBC was oxidized to Sb(V) with less ecotoxicity; moreover, FPBC800 with Fe 0 showed stronger oxidization. Although pH-dependent sorption of Sb(III)/Sb(V) on FPBC occurred, the resistance to environmental factors showed a potential for eliminating actual pollution, demonstrating an easy-to-operate construction strategy for modified biochar.