Effect of SiO2 nanoparticles on the removal of natural organic matter (NOM) by coagulation

Xue, Nan; Wang, Xue; Zhang, Furong; Wang, Yan; Chu, Yongbao; Zheng, Ying

Effect of SiO2 nanoparticles on the removal of natural organic matter (NOM) by coagulation

2016

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 nanoparticles (SiO₂ NPs, 50 nm) and common SiO₂ particles (2 μm) 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. What’s 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.

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