从分子质量的变化分析有机物对GAC吸附内分泌干扰物(BPA)的影响  

Impact of Organic Matter in Water on the Adsorption of EDCs(BPA) onto Granular Activated Carbon(GAC) from the View of Molecular Weight Distribution

作　　者：李若愚[1] 高乃云[1] 徐斌[1] 曾文慧[1] 赵建夫[1] 乐林生 

机构地区：[1]同济大学污染控制与资源化研究国家重点实验室,上海200092 [2]上海市自来水市北有限公司,上海200086

出　　处：《环境科学》2006年第12期2488-2494,共7页Environmental Science

基　　金：国家高技术研究发展计划(863)项目(2002AA601130);国家科技攻关计划重大项目(2003BA808A17);污染控制与资源化研究国家重点实验室开放课题(PCRRF05007)

摘　　要：从分子质量分布的角度研究了水中有机物对颗粒活性炭(GAC)吸附双酚A(BPA)容量及吸附速率的影响.结果表明,相对于以去离子水为本底的BPA溶液来说,GAC吸附以滤后水、臭氧后出水和原水为本底的BPA溶液的Langmuir模型的最大吸附容量qm值分别下降了29.95%、43.56%和44.44%,而其拟二级动力学模型的k2值分别下降了43.05%、49.75%和56.38%.相对分子质量3 000以上,尤其是10 000以上的有机物堵塞GAC的二级微孔;3 000以下,尤其是1 000以下的有机物与BPA分子之间存在直接的竞争吸附,是导致GAC对BPA的吸附容量以及吸附速率下降的主要原因.Impact of organic material with different molecular weight（ MW ） on the adsorption performance of endocrine disrupting chemicals（EDCs） bisphenol A （BPA） in water on granular activated carbon （GAC） were investigated. Compared to the adsorption capacity in deionized water, the qm values of Langmuir of BPA-raw water, BPA-fihered water and BPA-effluents after ozonation solution decrease 29.95 % , 43.56 % and 44.44 % respectively, and the k2 values of pseudo second order decrease 43.05 % , 49.75% and 56.38% respectively. On the hand, the secondary micropores may be blocked up by the organic matter with MW higher than 3 000, especially higher than 10 000, on the other hand, the direct sites competitive adsorption may be exists between the BPA molecule and the organic matter with MW lower than 3 000, especially lower than 1 000, Both of process may be resulted in reduction of the adsorption capacity, k2 value of adsorption kinetics of BPA onto GAC.

关 键 词：双酚A 分子量分布 有机物 颗粒活性炭 吸附等温线 吸附动力学 

分 类 号：X52[环境科学与工程—环境工程] TU991.2[建筑科学—市政工程]