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.
The adsorption behavior of methylene blue( MB) and crystal violet( CV) or MB and methyl orange( MO) from binary solutions on granular active carbon( GAC) with different mesopore volumes from 0. 16 to 0. 50 cm3/g was studied. The results showed that the adsorption capacities of MB,CV and MO on GAC in single dye solution increased with Vmesof GAC,which increased from 88. 98 to226. 69 mg/g,from 56. 04 to 105. 17 mg/g and from 64. 87 to 129. 66 mg/g,respectively. Competitive adsorption of MB and MO with similar molecular weights from binary solutions on the mesopore GAC was shown. Competitive adsorption effect increased with mesopore volume of GAC. The adsorption behavior of MB and CV with different molecular weights from binary solutions was more complicated. The competitive adsorption of MB from binary solutions showed that the effect of competitive adsorption of MB decreased when Vmesof GAC increased. Synergy adsorption of CV from binary solutions showed when Vmeswas below 0. 25 cm3/g. Competitive adsorption of CV from binary solutions showed when Vmeswas more than 0. 30 cm3/g. The study showed that the molecular weight and structure of dye play important roles in the competitive adsorption of binary solutions. The adsorption capacity of dyes in single or binary solutions increased when Vmesof GAC increased.
出处
《环境科学研究》
EI
CAS
CSSCI
CSCD
北大核心
2016年第11期1679-1686,共8页
Research of Environmental Sciences
基金
中央高校基本科研业务费专项资金项目(JB-ZR1150)
关键词
活性炭
染料
竞争吸附
分子量
中孔孔容
activated carbon
dye
competitive adsorption
molecular weight
mesoporous volume