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摘要
Arsenic (As), an extremely toxic metalloid, has a potential threat to the environment and human health. Crayfish shell, animal-derived biomass, was reused to prepare novel positively charged biochar (CSBC) at 300, 500, and 700 ℃ (CS300, CS500, and CS700) and the adsorption performance and mechanism of CSBC for As(III/Ⅴ) were investigated. The results revealed that pyrolysis temperature determined the physicochemical characteristics of CSBC. The maximum adsorption capacities of As(III/Ⅴ) on the CSBC predicted by the Langmuir model were following as: CS300 (7.71/8.40?mg·g-1)?>?CS700 (3.61/4.15?mg·g-1)?>?CS500 (2.61/2.76?mg·g-1), and the adsorption process reached equilibrium after 240?min. The spectroscopic characterization indicated the physical adsorption, electrostatic interaction, and complexation were involved in adsorption mechanisms of As(III/Ⅴ) by CSBC. Compared with CS500, the variety of functional groups on CS300 facilitated the complexation between it with As and the high degree of aromatization, and more positive charge for CS700 made it had stronger electrostatic interaction with As. These results highlight the significant potential of novel positively charged animal-derived biochar as an adsorbent for As(III/Ⅴ) removal from aqueous solution.
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