By a News Reporter-Staff News Editor at Ecology, Environment & Conservation -- Data detailed on Water Research have been presented. According to news reporting originating from Hangzhou, People's Republic of China, by VerticalNews correspondents, research stated, "This study aims to explore the mechanisms governing the transport and retention kinetics of TiO(2) nanoparticle aggregates (NPAs) in flow-through columns of packed sand, particularly under unsaturated conditions. The study was carried out at different pHs (2.6, 7.1, and 9.6) and ionic strengths (ISs) (1.0, 10, and 50 mM)."
Our news editors obtained a quote from the research from Zhejiang Gongshang University, "A two-site kinetic attachment model was used to describe transport behaviors of TiO(2) NPAs. At low ISs (i.e., 1.0 and 10 mM) and in neutral/alkaline conditions, high mobility of TiO(2) NPAs was observed in both saturated and unsaturated conditions. However, the retention of TiO(2) NPAs was substantially enhanced at the high IS (50 mM) and in extremely acidity condition (pH=2.6), because of increased aggregation and straining of TiO(2) NPAs during their transport course. The breakthrough curves (BTCs) of TiO(2) NPAs under unsaturated and saturated conditions almost overlapped, suggesting that decreasing the water saturation did not enhance the retention of TiO(2) NPAs in sand columns. This was probably due to the repulsive interactions existed between negatively charged air-water and TiO(2) NPAs systems that resulted in unfavorable attachment conditions. The two-site kinetic attachment model provided a good description for the BTCs of TiO(2) NPAs both in saturated and unsaturated conditions."
According to the news editors, the research concluded: "The fitted parameters could successfully explain the transport behaviors of TiO(2) NPAs under various solution chemistries."
For more information on this research see: Modeling the transport of TiO2 nanoparticle aggregates in saturated and unsaturated granular media: effects of ionic strength and pH. Water Research, 2013;47(3):1399-408. (Elsevier - www.elsevier.com; Water Research - www.elsevier.com/wps/product/cws_home/309)
The news editors report that additional information may be obtained by contacting J. Fang, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, People's Taiwan. Additional authors for this research include M.J. Xu, D.J. Wang, B. Wen and J.Y Han.
Keywords for this news article include: Asia, Hangzhou, Water Research, People's Republic of China.
Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2013, NewsRx LLC