Authors: Guang’an He Rui Chen Shushen Lu Chengchun Jiang Hong Liu Chuan Wang
Publish Date: 2015/11/26
Volume: 17, Issue: 11, Pages: 454-
Abstract
The predictable significant increase in manufacture and use of engineered nanoparticles ENPs will cause their inevitable release into environment and the potential harmful effects of ENPs have been confirmed As representative ENPs sedimentation behavior of nanotitanium dioxide nTiO2 should be better understood to control its environmental risk In this study an experimental methodology was established to set the sampling area and sampling time of nTiO2 sedimentation In addition we defined a quasistable state and a precise index ie sedimentation efficiency SE at this state to describe the nTiO2 sedimentation behavior Both alternative concentration determination and conventional size measurement were applied to evaluate the sedimentation behavior of nTiO2 with fulvic acid Results showed that the sedimentation behavior described by SE was more precise and in disagreement with those predicted by particle size Moreover sedimentation experiments with salicylic acid SA under an electric field and different water temperatures or with sulfosalicylic acid under light irradiation were also performed When the total organic carbon concentration of SA the voltage of working electrodes and water temperature increased or the wavelength of light source decreased the SE of nTiO2 increased and nTiO2 showed a tendency to settle in water These findings might be important for deepening the understanding of nTiO2 environmental behavior and exploring sedimentation behavior of other ENPsThis work was financially supported by the National Natural Science Foundation of China Nos 21067004 51378494 and 51378316 Shenzhen Science and Technology Innovation Committee Program JCYJ20130331151242230 and One Hundred Talents Program CAS
Keywords: