Release of deposited MnO2 nanoparticles from aqueous surfaces.
Release of deposited MnO2 nanoparticles from aqueous surfaces.
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DOI：
10.1016/j.jes.2019.12.011
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发表时间：
2020-04
影响因子：
6.9
通讯作者：
Hainan Wang;Ruixing Huang;Chengxue Ma;Xiaolin Li;Caihong Liu;Qiang He;Zhengsong Wu;Jun Ma;Xiaoliu Huangfu
中科院分区：
文献类型：
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作者：
Hainan Wang;Ruixing Huang;Chengxue Ma;Xiaolin Li;Caihong Liu;Qiang He;Zhengsong Wu;Jun Ma;Xiaoliu Huangfu
溶液化学和运输条件的变化可能导致从固体界面释放沉积的MnO 2纳米颗粒，使它们重新进入水环境。了解MnO 2纳米颗粒从自然表面的释放行为对于更好地预测MnO 2纳米颗粒的运输潜力和环境命运至关重要。采用石英晶体微天平（QCM-D），考察了不同环境表面类型、溶液pH值和代表性大分子有机物对MnO 2纳米颗粒释放的影响。MnO 2纳米颗粒首先沉积在晶体传感器在升高的NaNO 3浓度，然后用双去离子水冲洗，以诱导其再活化。结果表明，MnO 2的释放速率与表面类型有关，其大小顺序为：SiO2> Fe 3 O 4> Al 2 O3，这是由于表面与颗粒之间的静电相互作用所致。此外，溶液pH值的差异会导致MnO 2纳米粒子的释放行为的变化。从表面的释放速率显着较高，在pH值为9.8，在4.5，表明碱性条件下更有利于动员的MnO 2在水环境中。在大分子有机物存在下，牛血清白蛋白（BSA）能通过吸引力抑制MnO 2从表面的释放。在腐殖酸（HA）和海藻酸钠（SA）的存在下，MnO 2纳米颗粒更可能是移动的，这可能与空间位阻效应产生的大的排斥势垒有关。
Changes in solution chemistry and transport conditions can lead to the release of deposited MnO2nanoparticles from a solid interface, allowing them to re-enter the aqueous environment. Understanding the release behavior of MnO2nanoparticles from naturally occurring surfaces is critical for better prediction of the transport potential and environmental fate of MnO2nanoparticles. In this study, the release of MnO2nanoparticles was investigated using a quartz crystal microbalance with dissipation monitoring (QCM-D), and different environmental surface types, solution pH values and representative macromolecular organics were considered. MnO2nanoparticles were first deposited on crystal sensors at elevated NaNO3concentrations before being rinsed with double-deionized water to induce their remobilization. The results reveal that the release rate of MnO2depends on the surface type, in the decreasing order: SiO2> Fe3O4> Al2O3, resulting from electrostatic interactions between the surface and particles. Moreover, differences in solution pH can lead to variance in the release behavior of MnO2nanoparticles. The release rate from surfaces was significantly higher at pH 9.8 that at 4.5, indicating that alkaline conditions were more favorable for the mobilization of MnO2in the aquatic environment. In the presence of macromolecular organics, bovine serum albumin (BSA) can inhibit the release of MnO2from the surfaces due to attractive forces. In presence of humic acid (HA) and sodium alginate (SA), the MnO2nanoparticles were more likely to be mobile, which may be associated with a large repulsive barrier imparted by steric effects.