磷酸盐对锐钛矿纳米粒子分散稳定性及混凝/絮凝/沉淀去除效率的影响。
Effects of phosphate on the dispersion stability and coagulation/flocculation/sedimentation removal efficiency of anatase nanoparticles.
机构信息
Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, China; Jilin Provincial Key Laboratory of Water Resources and Environment, Jilin University, Changchun, 130021, China.
Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, China; Jilin Provincial Key Laboratory of Water Resources and Environment, Jilin University, Changchun, 130021, China.
出版信息
Chemosphere. 2019 Jun;224:580-587. doi: 10.1016/j.chemosphere.2019.02.162. Epub 2019 Feb 27.
This study investigates the behavior and fate of TiO NPs in conventional water treatment (coagulation/flocculation/sedimentation) under the influence of waterborne phosphate, focusing on the phosphate uptake rate, surface interactions, and dispersion stability and removal efficiency of TiO NPs. The adsorption of HPO ions on TiO NPs (i.e., surface complexation in solution) causes displacement of carbonate species. Moreover, adsorption experiments indicates that complexation of inorganic anions on the surfaces of TiO NPs can occur rapidly, within a 5 min time frame. This study confirmed that phosphate would affect the surface charge of the TiO NPs; thus, the bridging effect during coagulation may also be hindered by phosphate becoming attached to TiO NP surfaces. This information will contribute to nanotechnology-related water safety and water treatment technology.
本研究考察了在水合磷酸盐的影响下，TiO NPs 在常规水处理（混凝/絮凝/沉淀）中的行为和归宿，重点研究了 TiO NPs 的磷酸盐摄取率、表面相互作用、分散稳定性和去除效率。HPO 离子在 TiO NPs 上的吸附（即溶液中的表面络合）导致了碳酸盐物种的取代。此外，吸附实验表明，无机阴离子在 TiO NPs 表面的络合可以迅速发生，在 5 分钟的时间内完成。本研究证实，磷酸盐会影响 TiO NPs 的表面电荷；因此，磷酸盐附着在 TiO NP 表面也可能阻碍混凝过程中的桥接效应。这些信息将有助于与纳米技术相关的水安全和水处理技术。
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