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http://crossmark.crossref.org/dialog/?doi=10.1007/s11356-016-6299-8&domain=pdf
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Web End = Environ Sci Pollut Res (2016) 23:1183511844 DOI 10.1007/s11356-016-6299-8
RESEARCH ARTICLE
Effect of SiO2 nanoparticles on the removal of natural organic matter (NOM) by coagulation
Nan Xue1 & Xue Wang2 & Furong Zhang3 & Yan Wang1 & Yongbao Chu2 & Ying Zheng1
Received: 18 November 2015 /Accepted: 14 February 2016 /Published online: 8 March 2016 # Springer-Verlag Berlin Heidelberg 2016
Abstract In order to evaluate effect of engineered nanoparticles on the removal of natural organic matter (NOM), ENPs water sample (WATERNP), and common water sample (WATERCOMMON) were prepared by mixing the SiO2 nano-particles (SiO2 NPs, 50 nm) and common SiO2 particles (2 m) with water from Xiaoqing River. The removal variation, NOM fractionation, flocs properties, and IR spectra were investigated after polyaluminum chloride (PAC) coagulation. The results revealed that although the removal efficiencies of turbidity and NOM from WATERNP were moderately lower than those from WATERCOMMON, the fluorescence intensities of soluble microbial byproduct-like, humic acid-like, and aromatic protein II in coagulated WATERNP were lower than that in coagulated raw water and WATERCOMMON. Whats more, flocs of WATERNP showed the smallest size and highest fractal dimension as compared with other water samples, except for those obtained at B = 2.0.
Keywords SiO2 nanoparticles . Natural organic matter . Polyaluminum chloride . Coagulation
Introduction
Engineered nanoparticles (ENPs) are widely applied in many commercial, industrial, and consumer products, such as cosmetics, semiconductors, textiles, and pigments, for their excellent and unique physicochemical properties (Gong et al. 2009; Xu et al. 2012). The Woodrow Wilson Database listed an inventory of 1317 consumer products containing engineered nanoparticles (March 2011) currently on the market, which has grown by nearly 521 % since March 2006 (Liu et al. 2014). Inevitably, ENPs will be released into wastewaters and surface waters through manufacturing processes, waste disposal, or product uses (Weinberg et al. 2011). When ENPs are released into natural water environments, natural organic matter (NOM) that were presented in water could be absorbed on their surface, facilitating their transport into subsurface and groundwater environments (Jones & Su 2012). ENPs generally exhibit different thermal, electronic, magnetic, and optical properties as compared with those of bulk ones partially due to quantum size effect, surface area, and so on (Liu et...