活性炭中孔结构对双组分染料的竞争吸附

发布时间：2019-08-10 07:36

【摘要】：为探讨GAC(颗粒活性炭)的Vmes(中孔孔容)对双组分染料吸附行为的影响,对GAC进行改性,得到Vmes分别为0.16、0.25、0.30、0.50 cm3/g下的中孔GAC,并对MB(亚甲基蓝)、CV(结晶紫)、MO(甲基橙)进行了单组分和双组分体系的吸附试验.结果表明:1单组分体系中,随着Vmes的增加,各染料的饱和吸附量均增大,MB从88.98 mg/g增至226.69 mg/g;CV从56.04mg/g增至105.17 mg/g;MO从64.87 mg/g增至129.66 mg/g.2在由MB和MO组成的分子量接近的双组分体系中,两种染料表现为拮抗作用;随着Vmes的增加拮抗作用增强,并且对MB的拮抗作用大于对MO的作用.3在由MB和CV组成的分子量相差较大的双组分体系中,对于分子量较小的染料MB表现出拮抗作用,随着Vmes的增加,拮抗作用逐渐减小;对于分子量较大的染料CV来说,随着Vmes的改变吸附行为发生改变,当Vmes小于0.25 cm3/g时表现为协同作用,大于0.30 cm3/g转变为拮抗作用,并且随着Vmes的增大逐渐增强.研究显示,染料分子的物理形态对双组分物质竞争吸附的影响起到决定性作用,而吸附剂Vmes的增加促进了对单双组分染料分子的吸附容量增加.
[Abstract]:In order to investigate the effect of Vmes (mesoporous volume) of GAC (granular activated carbon) on the adsorption behavior of two-component dye, GAC was modified to obtain mesoporous GAC, at Vmes of 0.16, 0.25, 0.30 and 0.50 cm3/g, respectively. MB (methylene blue), CV (crystal purple), MO (methyl orange) was adsorbed by one-component and two-component systems. The results showed that: (1) in the single component system, with the increase of Vmes, the saturated adsorption capacity of each dye increased, and the MB increased from 88.98 mg/g to 226.69 mg/g;CV from 56.04mg/g to 105.17 mg/g;MO from 64.87 mg/g to 129.66 mg/g.2, and the two dyes showed antagonistic effect in the two-component system composed of MB and MO. With the increase of Vmes, the antagonism of MB was enhanced, and the antagonism of MB was greater than that of MO. 3 in the two-component system composed of MB and CV, it showed antagonism to MB with small molecular weight, and the antagonism decreased gradually with the increase of Vmes. For dye CV with large molecular weight, the adsorption behavior changed with the change of Vmes. When Vmes was less than 0.25 cm3/g, it showed synergistic effect, greater than 0.30 cm3/g changed into antagonism, and gradually increased with the increase of Vmes. The results show that the physical morphology of dye molecules plays a decisive role in the competitive adsorption of two-component substances, and the increase of adsorbents Vmes promotes the increase of adsorption capacity of single-component dye molecules.
【作者单位】：华侨大学化工学院;西南民族大学图书馆;
【基金】：中央高校基本科研业务费专项资金项目(JB-ZR1150)
【分类号】：X703

【相似文献】