Influence of titanium dioxide nanoparticles on speciation and bioavailability of arsenite |
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| Authors: | Sun Hongwen Zhang Xuezhi Zhang Zhiyan Chen Yongsheng Crittenden John C |
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| Affiliation: | a Key Laboratory of Pollution Processes and Environmental Criteria of Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
b Department of Civil and Environmental Engineering, Arizona State University, Tempe, AZ 85287, USA |
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| Abstract: | In this study, the influence of the co-existence of TiO2 nanoparticles on the speciation of arsenite [As(III)] was studied by observing its adsorption and valence changing. Moreover, the influence of TiO2 nanoparticles on the bioavailability of As(III) was examined by bioaccumulation test using carp (Cyprinus carpio). The results showed that TiO2 nanoparticles have a significant adsorption capacity for As (III). Equilibrium was established within 30 min, with about 30% of the initial As (III) being adsorbed onto TiO2 nanoparticles. Most of aqueous As (III) was oxidized to As(V) in the presence of TiO2 nanoparticles under sunlight. The carp accumulated considerably more As in the presence of TiO2 nanoparticles than in the absence of TiO2 nanoparticles, and after 25-day exposure, As concentration in carp increased by 44%. Accumulation of As in viscera, gills and muscle of the carp was significantly enhanced by the presence of TiO2 nanoparticles. |
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| Keywords: | Arsenic TiO2 Nanoparticles Bioaccumulation Carp Facilitated transport |
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