TY - JOUR
T1 - Remediation of organic and inorganic arsenic contaminated groundwater using a nanocrystalline TiO 2-based adsorbent
AU - Jing, Chuanyong
AU - Meng, Xiaoguang
AU - Calvache, Edwin
AU - Jiang, Guibin
PY - 2009/8
Y1 - 2009/8
N2 - A nanocrystalline TiO 2-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 TiO 2 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).
AB - A nanocrystalline TiO 2-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 TiO 2 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).
KW - Adsorptive filtration
KW - Charge distribution multi-site surface complexation model
KW - EXAFS
KW - Inorganic arsenic
KW - Organic arsenic
KW - TiO
UR - http://www.scopus.com/inward/record.url?scp=68649093471&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=68649093471&partnerID=8YFLogxK
U2 - 10.1016/j.envpol.2009.03.011
DO - 10.1016/j.envpol.2009.03.011
M3 - Article
C2 - 19339086
AN - SCOPUS:68649093471
SN - 0269-7491
VL - 157
SP - 2514
EP - 2519
JO - Environmental Pollution
JF - Environmental Pollution
IS - 8-9
ER -