کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4425886 | 1619214 | 2009 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Remediation of organic and inorganic arsenic contaminated groundwater using a nanocrystalline TiO2-based adsorbent Remediation of organic and inorganic arsenic contaminated groundwater using a nanocrystalline TiO2-based adsorbent](/preview/png/4425886.png)
A nanocrystalline TiO2-based adsorbent was evaluated for the simultaneous removal of As(V), As(III), monomethylarsonic acid (MMA), and dimethylarsinic acid (DMA) in contaminated groundwater. Batch experimental results show that As adsorption followed pseudo-second order rate kinetics. The competitive adsorption was described with the charge distribution multi-site surface complexation model (CD-MUSIC). The groundwater containing an average of 329 μg L−1 As(III), 246 μg L−1 As(V), 151 μg L−1 MMA, and 202 μg L−1 DMA was continuously passed through a TiO2 filter at an empty bed contact time of 6 min for 4 months. Approximately 11 000, 14 000, and 9900 bed volumes of water had been treated before the As(III), As(V), and MMA concentration in the effluent increased to 10 μg L−1. However, very little DMA was removed. The EXAFS results demonstrate the existence of a bidentate binuclear As(V) surface complex on spent adsorbent, indicating the oxidation of adsorbed As(III).
Journal: Environmental Pollution - Volume 157, Issues 8–9, August–September 2009, Pages 2514–2519