采用山竹皮粉末为原料,通过吸附作用将铅离子定量负载。吸附实验表明,随着pH升高,山竹皮粉末对铅离子的吸附率明显增加,最大吸附量达到1.0mol/kg,且40min内可达到吸附平衡。热重分析结果显示,山竹皮粉末负载的铅离子数量对其开始剧烈燃烧热分解的特征温度起到明显的降低作用。在一定浓度范围内(<2mmol/L),负载的铅离子数量越多,山竹皮粉末开始燃烧的热分解温度以及剧烈燃烧的温度都会显著降低;而当吸附的铅离子数量达到一定程度之后(≥2mmol/L),山竹皮粉末剧烈燃烧的热分解温度则不再发生明显的变化。原因是在山竹皮粉末燃烧过程中铅离子起到了催化剂的作用,可以促进燃烧反应,将山竹皮粉末的燃烧分解温度从441℃降低到405℃。
Mangosteen peel powder was used as raw material,and lead ions were loaded into it quantitatively by adsorption.The adsorption experiments showed that with the increase of solution pH,the adsorption rate of mangosteen peel powder for lead ions increased correspondingly.The saturated adsorption capacity was 1.0mol/kg,and the adsorption reached the equilibrium in 40min.Thermogravimetric analysis results indicated that the amount of lead ions loaded on mangosteen peel powder significantly reduced the characteristic temperature of its combustion thermal decomposition.In a certain lead ion concentration range (<2mmol/L),as the amount of loaded lead ions increased,the temperature points at which the thermal decomposition began and the intense combustion ended decreased significantly.However,when the amount of adsorbed lead ions reached a certain degree (≥2mmol/L),the thermal decomposition temperature of mangosteen peel powder intense combustion no longer changed significantly.The analysis revealed that lead ions played the role of catalyst in the combustion process,which could effectively promote the combustion reaction and reduce the combustion temperature from 441℃ to 405℃.
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基金资助
中央高校基本科研业务费资助项目(FRF-GF-18-025B)
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