Deposition behavior of dissolved black carbon on representative surfaces: Role of molecular conformation. Issue 5 (October 2021)

• Record Type: Journal Article
• Authors: Ou, Qin; Xu, Yanghui; He, Qiang; Wu, Zhengsong; Ma, Jun; Huangfu, Xiaoliu
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 5(2021)
• Publication Date: 2021-10
• Subjects: Dissolved black carbon -- Deposition behavior -- Release behavior -- Molecular conformation -- Viscoelastic property; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.105921
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: To understand the fate of colloidal or dissolved black carbon (DBC) in aquatic systems, a quartz crystal microbalance with dissipation (QCM-D) was applied to investigate deposition and release behaviors of DBC. The results suggested that DBC molecular composition and conformation were critical to the deposition processes on model surfaces, which were controlled by not only the classic Derjaguine-Landaue-Verweye-Overbeek (DLVO) interactions but also non-DLVO forces. The deposition rates of alumina, iron oxide and polyamide surfaces first increased due to the change of conformation and then decreased as the salt concentration increased. Correspondingly, the deposition layers first became more rigid and then got softer with the increase in the ionic strength. Both the pH values and calcium ion had distinctive effects on the deposition behaviors and viscoelastic properties due to their particular roles in DBC surface characteristic and molecular conformation. Overall, these results are meaningful to understand the environmental behaviors of DBC in aquatic systems. Graphical abstract: ga1 Highlights: Both DLVO interactions and non-DLVO forces controlled the DBC deposition behaviors. Extended conformation under low ionic strengths went against DBC deposition processes. The film rigidity was first enhanced and then reduced as the ionic strength increased. DBC produced at different temperatures had distinct deposition behaviors. Low pH values and calcium ion addition had a fast deposition and a rigid layer.