以甲苯为典型VOCs废气分子,考察了不同活性炭样品的碘值、四氯化碳吸附率(CTC值)、总比表面积和微孔比表面积与其动态甲苯平衡吸附容量的关系.结果发现,无论是低浓度还是高浓度的甲苯废气,CTC值均与活性炭的吸附容量呈现较高的线性相关性,相关系数R2高于0.92,而碘值只在低浓度条件下与活性炭吸附容量相关性较好,这表明CTC值相比碘值是更适合表征活性炭VOCs吸附性能的特征指标.此外,以含氧类VOCs(乙酸乙酯)为吸附质,CTC值也同样显示出与吸附容量优良的相关性.除活性炭外,本文还将上述方法拓展至硅胶、分子筛、碳硅复合材料等其他多孔吸附材料,结果证明CTC值可以用来指代不同多孔吸附材料的VOCs吸附性能,相对误差在30%以内,表明CTC值作为一个吸附特征指标具有良好的普适性.
Abstract
In this study, we investigated the relationship between the iodine number, carbon tetrachloride adsorption value (CTC value), total surface area, and micropore surface area of various activated carbon samples. We focused on their dynamic adsorption capacity for toluene, a representative volatile organic compound (VOC) found in exhaust gases. The results indicated that the CTC value showed a strong linear correlation with the adsorption capacity of activated carbon, regardless of toluene concentration in the exhaust gas. In contrast, the iodine number exhibited a better association with adsorption capacity only under low concentration conditions. This suggests that the CTC value is a more suitable indicator than the iodine number for evaluating the VOC adsorption performance of activated carbon. Furthermore, when oxygen-containing VOCs such as ethyl acetate were used as adsorbates, the CTC value also showed a favorable correlation with adsorption capacity. Beyond activated carbon, this study extended the methodology to different porous adsorbent materials, including silica gel, molecular sieves, and carbon-silica composites. The results demonstrated that the CTC value can also represent the VOC adsorption performance of these materials. This underscores the universality of the CTC value as a characteristic indicator of adsorption performance.
关键词
VOCs吸附量 /
碘值 /
活性炭 /
四氯化碳吸附率(CTC值)
Key words
activated carbon /
carbon tetrachloride adsorption(CTC) rate /
iodine number /
VOCs adsorption capacity
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基金
浙江省领雁研发攻关计划项目(2023C03127);国家重点研发项目(2022YFC3702003)
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