【摘要】 本文通过静态批量实验和柱吸附实验研究比较了一种颗粒活性炭(GAC)和粉末活性炭(PAC)对水中微量2,4-二氯苯氧乙酸(2,4-D)和壬基酚(NP)的吸附作用。结果表明两种活性炭可以快速有效去除2,4-D和NP。2,4-D的吸附符合一级反应动力学,在25℃和35℃的等温线符合Freundlich和Langmuir模型,饱和吸附量都大于100mg/g。GAC比PAC吸附2,4-D慢,但吸附能力和理论饱和吸附量大。NP吸附等温线不符合以上两种模型,振荡条件下,NP初始浓度大于20mg/L时,PAC吸附的NP出现解析,GAC上的NP吸附增强,GAC的吸附量大于PAC。柱实验结果表明,两种活性炭柱上的吸附态NP都增强水体中NP的进一步吸附,且PAC吸附量较大。更多还原

【Abstract】 The adsorption of 2,4-dichlorophenoxyacetic acid(2,4-D) and nonylphenol (NP) on granular activated carbon(GAC) and power activated carbon (PAC) was studied through static batch and flow-through-column experiments. Both kinds of AC could efficiently remove low concentration of 2,4-D and NP from water. The adsorption of 2,4-D followed the first-order kinetics, and isotherms obeyed the Freundlich and Langmuir patterns at 25℃ and 35℃, with theoretical saturation adsorption capacity of more than 100mg/g. GAC adsorbing 2,4-D was slower than PAC, however the adsorption coefficients and theoretical saturation adsorption capacity of GAC were higher. The isotherms of NP did not obey the above patterns. Under the condition of oscillation, when initial NP concentration>20mg/L, the desorption of NP from PAC appeared; the adsorption of NP on GAC was enhanced and the adsorption quantity of GAC was greater than that of PAC. In the column experiments, enhancement of adsorption of more NP on both kinds of AC occurred, and the adsorption capacity of PAC was higher.更多还原