Deposition Kinetics of Colloidal Manganese Dioxide onto Representative Surfaces in Aquatic Environments: The Role of Humic Acid and Biomacromolecules
Deposition Kinetics of Colloidal Manganese Dioxide onto Representative Surfaces in Aquatic Environments: The Role of Humic Acid and Biomacromolecules
复制标题
水生环境中胶体二氧化锰在代表性表面上的沉积动力学：腐殖酸和生物大分子的作用
DOI：
10.1021/acs.est.8b04274
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发表时间：
2019-01-01
影响因子：
11.4
通讯作者：
Huang, Muhua
中科院分区：
文献类型：
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作者：
Huangfu, Xiaoliu;Ma, Chengxue;Huang, Muhua
使用配备耗散监测设备 (QCM-D) 的实验室石英晶体微天平，研究了 NaNO3 溶液中水生系统中三个代表性表面（即二氧化硅、磁铁矿和氧化铝）上胶体 MnO2 的初始沉积动力学，模型成分包括腐殖酸 (HA)、多糖（藻酸盐）和蛋白质（牛血清白蛋白 (BSA)）。结果表明，MnO2 胶体在三个表面上的沉积行为当胶体 MnO2 沉积到二氧化硅和磁铁矿上时，临界沉积浓度 (CDC) 分别确定为 15.5 mM NaNO3 和 9.0 mM NaNO3，这与经典的 Derjaguin-Landau-Verwey-Overbeek (DLVO) 理论非常吻合。然而，BSA 的存在可以提供更有吸引力的沉积位点，从而导致 MnO2 胶体在表面上的沉积行为更大。沉积层的耗散特性也受到表面类型、电解质浓度和有机物特性的影响。总体而言，这些结果提供了对 MnO2 胶体在环境表面上的沉积行为的深入了解，并对预测常见 MnO2 胶体在自然环境和工程系统中的传输潜力具有重要意义。
The initial deposition kinetics of colloidal MnO2 on three representative surfaces in aquatic systems (i.e., silica, magnetite, and alumina) in NaNO3 solution were investigated in the presence of model constituents, including humic acid (HA), a polysaccharide (alginate), and a protein (bovine serum albumin (BSA), using laboratory quartz crystal microbalance with dissipation monitoring equipment (QCM-D). The results indicated that the deposition behaviors of MnO2 colloids on three surfaces were in good agreement with classical Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. Critical deposition concentrations (CDC) were determined to be 15.5 mM NaNO3 and 9.0 mM NaNO3 when colloidal MnO2 was deposited onto silica and magnetite, respectively. Both HA and alginate could largely retard the deposition of MnO2 colloids onto three selected surfaces due to steric repulsion, and HA was more effective in decreasing the deposition rate relative to alginate. However, the presence of BSA can provide more attractive deposition site and thus lead to greater deposition behavior of MnO2 colloids onto surfaces. The dissipative properties of the deposited layer were also influenced by surface type, electrolyte concentration, and organic matter characteristics. Overall, these results provide insights into the deposition behavior of MnO2 colloids on environmental surfaces and have significant implications for predicting the transport potential of common MnO2 colloids in natural environments and engineered systems.