山竹皮粉末对铁离子的吸附行为及其燃烧特性

Adsorption Behavior of Iron Ions onto Mangosteen Peel and Its Unique Combustion Properties

采用山竹皮粉末为原料,通过吸附作用将三价铁离子定量负载。吸附实验表明,随着pH值升高,对铁离子的吸附率明显增加,Fe^(3+)最大吸附容量可以达到1.22 mol/kg,且30 min内即可达到吸附平衡。吸附有铁离子的山竹皮粉末在空气中的热重结果显示,负载铁离子的数量对其燃烧热分解的特征温度起着显著的影响作用。在一定浓度范围内(<5 mmol/L),负载的铁数量越多,则其开始热分解以及燃烧结束的温度点都会显著降低;而当吸附的铁离子数量达到一定程度之后(≥5 mmol/L),其热分解特征值则不再发生明显的变化。分析认为,铁离子在燃烧过程中扮演了催化剂的作用,可以有效地促进燃烧反应,将最剧烈燃烧温度点从441℃降低到358℃。

Mangosteen peel was used to prepare the adsorbent via soaking in the sodium hydroxide alkaline solution,and then the ferric ion was loaded into it quantitatively by adsorption.The amount of iron ions loaded on mangosteen peel was confirmed by thermal gravimetric and differential thermal gravimetric analysis,which had a significant effect on the characteristic temperature of combustion thermal decomposition.The results showed that in a certain concentration range,the more iron ions adsorbed,the temperature points at which mangosteen peel began thermal decomposition and ended combustion would decrease significantly.When the number of iron ions adsorbed reaches a certain level,the thermal decomposition characteristic value does not change significantly.The analysis shows that iron ion plays the role of catalyst in the combustion process,which can effectively promote the combustion reaction and reduce the combustion temperature point from 441℃to 358℃.