Environment Protection Research and Design Institute of Ningbo

of Ningbo, China

Environment Protection Research and Design Institute of Ningbo

of Ningbo, China

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Fang J.,Zhejiang GongShang University | Zhang K.,Zhejiang GongShang University | Sun P.,Zhejiang GongShang University | Lin D.,Zhejiang University | And 3 more authors.
Science of the Total Environment | Year: 2016

This study investigated the effects of suspended TiO2 nanoparticles (nTiO2) on the transport of Pb2 + in saturated repacked soil columns under different ionic strengths (IS) and in the presence of fulvic acid (FA). Also, the contribution of soil colloids to the mobility of Pb2 + was discussed. In the absence of nTiO2, little amount of Pb2 + was detected in the effluent even in the presence of FA. However, the presence of nTiO2 significantly enhanced the mobility of Pb2 + in soil columns under all tested conditions and nTiO2-associated Pb2 + was the major migration species of Pb2 +. Increasing the solution IS decreased the nTiO2-associated Pb2 + migration due to the significant decrease in the mobility of nTiO2 in soil. FA remarkably increased the nTiO2-associated Pb2 + mobility in soil column, which was mainly to increase the mobility of nTiO2 in soil and decrease desorption rate of Pb2 + from nTiO2 during transport. Moreover, nTiO2 significantly enhanced the release of Fe-Al soil colloids, which in turn was also responsible for the enhancement of Pb2 + mobility in soil. © 2016 Elsevier B.V.


PubMed | Zhejiang Agriculture And forestry University, Zhejiang GongShang University and Environment Protection Research and Design Institute of Ningbo
Type: | Journal: The Science of the total environment | Year: 2016

This study investigated the effects of suspended TiO2 nanoparticles (nTiO2) on the transport of Pb(2+) in saturated repacked soil columns under different ionic strengths (IS) and in the presence of fulvic acid (FA). Also, the contribution of soil colloids to the mobility of Pb(2+) was discussed. In the absence of nTiO2, little amount of Pb(2+) was detected in the effluent even in the presence of FA. However, the presence of nTiO2 significantly enhanced the mobility of Pb(2+) in soil columns under all tested conditions and nTiO2-associated Pb(2+) was the major migration species of Pb(2+). Increasing the solution IS decreased the nTiO2-associated Pb(2+) migration due to the significant decrease in the mobility of nTiO2 in soil. FA remarkably increased the nTiO2-associated Pb(2+) mobility in soil column, which was mainly to increase the mobility of nTiO2 in soil and decrease desorption rate of Pb(2+) from nTiO2 during transport. Moreover, nTiO2 significantly enhanced the release of Fe-Al soil colloids, which in turn was also responsible for the enhancement of Pb(2+) mobility in soil.

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