Fate of fluorescent core-shell silica nanoparticles during simulated secondary wastewater treatment.
Fate of fluorescent core-shell silica nanoparticles during simulated secondary wastewater treatment.
复制标题
在模拟的继发废水处理过程中，荧光芯壳二氧化硅纳米颗粒的命运。
DOI：
10.1016/j.watres.2015.03.021
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发表时间：
2015-06-15
期刊：
影响因子：
12.8
通讯作者：
Sierra-Alvarez, Reyes
中科院分区：
文献类型：
--
作者：
Otero-Gonzalez, Lila;Field, Jim A.;Calderon, Isen A. C.;Aspinwall, Craig A.;Shadman, Farhang;Zeng, Chao;Sierra-Alvarez, Reyes
关键词：
二氧化硅纳米颗粒（SiO2 NPs）在消费品和工业过程中的使用越来越多，导致SiO2 NP排放到废水中。因此，有必要了解废水处理过程中SiO2纳米颗粒的命运。然而，环境系统中SiO2纳米颗粒的检测受到天然硅背景水平升高的阻碍。在这项工作中，实验室合成的荧光核-壳SiO2纳米颗粒被用来研究这些纳米颗粒在二级废水处理过程中的命运。荧光测量为SiO2 NP追踪提供了一种简单快速的方法。实验室规模的活性污泥系统包括一个曝气池和一个沉降器进料与合成废水含有钙。7.5 mg L-1的荧光SiO2 NP持续30天。在前6天内，废水中的SiO2 NP被有效去除（>96%），但随后出水中SiO2 NP的浓度逐渐增加，NP投加30天后，NP排放量高达输入量的65%。SiO2纳米颗粒的去除效果差与废水中纳米颗粒的高胶体稳定性及其有限的生物吸附倾向有关。虽然使用荧光显微镜观察到一定程度的NP吸附在生物质上，但SiO2 NPs对活性污泥的亲和力不足以从废水中持续有效地去除SiO2 NPs。
Increasing use of silica nanoparticles (SiO2 NPs) in consumer products and industrial processes leads to SiO2 NP discharge into wastewater. Thus, there is a need to understand the fate of SiO2 NPs during wastewater treatment. However, the detection of SiO2 NPs in environmental systems is hindered by the elevated background levels of natural silicon. In this work, laboratory-synthesized fluorescent core-shell SiO2 NPs were used to study the fate of these NPs during secondary wastewater treatment. Fluorescent measurements provided an easy and fast method for SiO2 NP tracking. A laboratory-scale activated sludge system consisting of an aeration tank and a settler was fed with synthetic wastewater containing ca. 7.5 mg L−1 of fluorescent SiO2 NPs for 30 days. SiO2 NPs were effectively removed from the wastewater (>96%) during the first 6 days, however the concentration of SiO2 NPs in the effluent gradually increased afterwards and the NP discharge was as high as 65% of the input after 30 days of NP dosing. The poor removal of the SiO2 NPs was related to the high colloidal stability of the NPs in the wastewater and their limited propensity to biosorption. Although some degree of NP adsorption on the biomass was observed using fluorescence microscopy, the affinity of SiO2 NPs for the activated sludge was not enough for a sustained and effective removal of the SiO2 NPs from the wastewater.
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影响因子：
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作者：
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