期刊
WATER RESEARCH
卷 43, 期 3, 页码 677-683出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2008.10.050
关键词
Atrazine; Polycation-clay composites; Filtration; Dissolved organic matter; Water purification
资金
- Ministry of Science Culture and Sport of Israel [472/7, 3-4351]
Atrazine removal from water by two polycations pre-adsorbed on montmorillonite was studied, Batch experiments demonstrated that the most suitable composite poly (4-vinylpyridine-co-styrene)-montmorillonite (PVP-co-S90%-mont.) removed 90-99% of atrazine (0.5-28 ppm) within 20-40 min at 0.367% w/w. Calculations employing Langmuir's equation could simulate and predict the kinetics and final extents of atrazine adsorption. Column filter experiments (columns 20 x 1.6 cm) which included 2 g of the PVP-co-S90%-mont. composite mixed with excess sand removed 93-96% of atrazine (800 ppb) for the first 800 pore volumes, whereas the same amount of granular activated carbon (GAC) removed 83-75%. In the presence of dissolved organic matter (DOM; 3.7 ppm) the efficiency of the GAC filter to remove atrazine decreased significantly (68-52% removal), whereas the corresponding efficiency of the PVP-co-S90%-mont. filter was only slightly influenced by DOM. At lower atrazine concentration (7 ppb) the PVP-co-S90%-mont. filter reduced even after 3000 pore volumes the emerging atrazine concentration below 3 ppb (USEPA standard). in the case of the GAC filter the emerging atrazine concentration was between 2.4 and 5.3 mu g/L even for the first 100 pore volumes. Thus, the PVP-co-S90%-mont. composite is a new efficient material for the removal of atrazine from water. (C)2008 Elsevier Ltd. All rights reserved.
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