The biochar was prepared from walnut shell,and the adsorption properties of the walnut shell biochar produced at different pyrolysis temperatures Sb3+ were compared.The walnut shell biochar was modified by Fe/Mn co-precipitation method.The two kinds of biochar was characterized by SEM,BET,XRD,XPS and FT-IR,and the adsorption properties and mechanisms for Sb3+ were analyzed.The results showed that,compared to simple pyrolytic carbonization,the introduction of Fe/Mn elements increased the oxygen-containing functional groups on the surface of the original biochar,and the specific surface area increased from 13.801m2/g to 305.732m2/g.The adsorption of Sb3+ in aqueous solution by the walnut shell biochar and Fe/Mn-modified biochar conformed to the pseudo-second-order kinetic equation and Langmuir adsorption isotherm model.The maximum adsorption capacity of Sb3+ by modified biochar was 68.062mg/g.The adsorption mechanism mainly included iron oxide complexation,Sb3+—π bond interaction,and manganese oxide reduction reaction.
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基金资助
陕西省重点研发计划项目(2022SF-578);陕西省水利科技计划资助项目(2022slkj-5)
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